Applying the Tools of Systems Thinking to Implement & Manage Change on Campus
D10R Implement Systems
-
Upload
ahmed-adel-abo-hazem -
Category
Documents
-
view
230 -
download
0
Transcript of D10R Implement Systems
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 1/60
Service Training SESV1692
Meeting Guide 692 October 1997
TECHNICAL PRESENTATION
D11R TRACK-TYPE TRACTOR
IMPLEMENT SYSTEMS
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 2/60
D11R TRACK-TYPE TRACTORIMPLEMENT SYSTEMS
MEETING GUIDE 692 SLIDES AND SCRIPT
AUDIENCE
Level II--Service personnel who understand the principles of machine systems operation, diagnosticequipment, and procedures for testing and adjusting.
CONTENT
This presentation discusses the operation of the implement hydraulic system for the D11R Track-type
Tractor.
OBJECTIVES
After learning the information in this presentation, the serviceman will be able to:
1. locate and identify all major components in the implement hydraulic system;
2. locate and identify all filters, drains, and test points;
3. explain the function of each component in the implement hydraulic system; and
4. trace the flow of oil through the implement hydraulic system.
REFERENCES
D11R Track-type Tractor Service Manual (9TR 1-Up) SENR1775
D11R Track-type Tractor Service Manual (8ZR 1-Up) SENR9400
PREREQUISITES
Interactive Video Course "Fundamentals of Mobile Hydraulics" (CD ROM) TECD9001STMG 546 "Graphic Fluid Power Symbols" SESV1546
SUPPLEMENTARY TRAINING MATERIAL
STMG 679 "D10R Track-type Tractor--Introduction" SESV1679
STMG 527 "D11N Track-type Tractor--Part 2: Undercarriage, Implements, and
Operator’s Station" SESV1527
Video Tape "D11R Track-type Tractor/D11R CD Carrydozer--Introduction" SEVN4173
Estimated Time: 2 Hours
Visuals: 27 (2 X 2) SlidesServiceman Handouts: 18 Line Drawings
Form: SESV1692
Date: 10/97
© 1997 Caterpillar Inc.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 3/60
STMG 692 - 3 -
10/97
TABLE OF CONTENTS
INTRODUCTION ..................................................................................................................5
IMPLEMENT HYDRAULIC SYSTEM................................................................................6
Bulldozer Tilt Circuit........................................................................................................9Bulldozer Lift Circuit......................................................................................................12
Quick-drop Valves ..........................................................................................................19
Fan Drive Hydraulic System...........................................................................................25
Ripper and Pilot Circuits.................................................................................................26
Dual Tilt Valve................................................................................................................33
CONCLUSION.....................................................................................................................40
SLIDE LIST..........................................................................................................................41
SERVICEMAN'S HANDOUTS...........................................................................................42
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 4/60
INSTRUCTOR NOTES
STMG 692 - 4 -
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 5/60
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 6/60
STMG 692 - 6 -
10/97
2
• Continuous flow at
minimum pressurewith controls in HOLD
• Two section gear-typepump
• Pilot operated controlvalves
DUAL TILT
CONTROL VALVE
QUICK-DROP
VALVES
RIPPER
CONTROL VALVE
HYDRAULIC
TANK
PILOT VALVE
AND DOZER
CONTROL VALVE
IMPLEMENT
PUMP
FAN MOTOR AND
MAKEUP VALVE
OIL COOLER AND
BYPASS VALVE
FAN
PUMPS
IMPLEMENT HYDRAULIC SYSTEM COMPONENTS
IMPLEMENT HYDRAULIC SYSTEM
The implement hydraulic system for the D11R is a continuous flow design
that permits minimum pressure in the system when the implement control
valves are not activated. The pump for operation of the bulldozer, ripper,
and oil cooling circuits is a two section gear-type pump (large and small
sections).
The system components include: the pump, pilot operated control valves,
demand control fan pumps, dozer control valve, quick-drop valves, dualtilt control valve, and a ripper control valve. The system components
control the flow of hydraulic oil to the appropriate implement cylinders.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 7/60
• Hydraulic tankcomponents:
1. Oil fill tube
2. Manual air vent
3. Hydraulic oil filters4. Sight gauge
5. S•O•S tap
6. Tank drain
3
The hydraulic tank is located on the right fender just outside the operator's
compartment. The oil fill tube and cap (1) are located on the top of the
tank. Inside the fill tube is a fine mesh screen which removes large
particles of dirt or foreign material from the oil as the tank is filled. A
manual air vent (2) and the breaker relief valve (not visible) are located
near the filters. The vacuum breaker relief valve has a pressure setting of 3.5 kPa (.5 psi). Two hydraulic oil filters (3) are located inside the tank.
The oil level sight gauge (4) on the front of the tank permits an easy
check of the hydraulic system oil level. Always clean the sight gauge to
be sure the oil level is visible. Dirt and stains on the glass frequently give
the appearance of a full tank. A scheduled oil sampling (S•O•S) tap (5)
and tank drain (6) are located on the front of the tank.
NOTE: The capacity of the D11R hydraulic system is approximately
205 Liters (54 gal.).
STMG 692 - 7 -
10/97
32
1
5
6
4
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 8/60
STMG 692 - 8 -
10/97
4
• Dozer control valvecomponent locations
• Manually operated
dozer lift spool
• Pilot operated bladetilt spool
FROM SMALL PUMP
FROM LARGE PUMP
FROM PILOT VALVE
ROD END LIFT CYLINDER
HEAD END LIFT CYLINDER
ROD END
TILT CYLINDER
HEAD END
TILT CYLINDER
LIFT SPOOL
LIFT RELIEF
VALVE
TILT
SPOOL
DOZER CONTROL VALVEHOLD
The dozer control valve is located below the operator's station on the right
side of the machine. Inside the control valve are two spools. One spool is
for blade lift and lower and one spool is for blade tilt. The blade lift spool
is manually operated and the blade tilt spool is operated by pilot oil.
The manually operated dozer lift spool has four positions: RAISE,
HOLD, LOWER, and FLOAT. Only the FLOAT position has a detent.
The pilot operated blade tilt spool has three positions: TILT RIGHT,
HOLD, and TILT LEFT. None of these positions has a detent.
The tilt circuit receives oil from the small section of the pump. When the
circuit is not in use, the oil joins the large pump section oil flow to the lift
circuit. If neither circuit is in use, the dump valve opens and sends oil
flow to the tank. Both the tilt and lift circuits have load check valves and
relief valves. The lift circuit has makeup valves for both the rod and head
ends of the lift cylinders.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 9/60
STMG 692 - 9 -
10/97
5
A A
SECTION A-A
FROM SMALL PUMP
FROM LARGE PUMP
FROM PILOT VALVE
DOZER TILT SPOOLHOLD
TILT RIGHT TILT LEFT
Bulldozer Tilt Circuit
The tilt spool has three positions: TILT RIGHT, HOLD, and TILT LEFT.
The tilt spool is hydraulically operated by pilot pressure from a pilot valve
which is controlled by the blade control lever. Movement of the lever to
the right sends pilot pressure oil to the left end of the of the tilt valve
spool. The pilot pressure moves the spool to the right and sends oil from
the pump to the rod end of the tilt cylinder, and the blade tilts right. Lever
movement to the left sends pilot pressure oil to the right end of the spool.
The spool moves to the left, sends pump oil to the tilt cylinders, and theblade tilts left. When the blade control lever is released from either the
TILT RIGHT or TILT LEFT position, springs return the tilt spool to the
HOLD position.
In the HOLD position, the oil from the small section of the pump goes
around the tilt spool and joins the oil from the large section of the pump.
The oil then opens the dump valve and returns to the tank.
• Tilt circuit component
locations
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 10/60
STMG 692 - 10 -
10/97
6
• Pilot oil moves tiltspool to right
• Pressure opens load
check valve
• Oil goes to tilt cylinder
to retract rod
A A
SECTION A-A
DOZER TILT SPOOLTILT RIGHT
TILT RIGHT TILT LEFT
FROM SMALL PUMP
FROM LARGE PUMP
FROM PILOT VALVE
When the dozer control lever is moved to the TILT RIGHT position, pilot
oil goes to the left end of the tilt spool. The pressure of the pilot oil
moves the tilt spool to the TILT RIGHT position. In the TILT RIGHT
position, the oil from the small section of the pump cannot go through the
control valve and the pressure of the oil increases. The increased pressure
of the oil opens the load check valve. The pump oil goes through the
open load check valve and around the tilt spool to the rod end of the tilt
cylinder. The tilt cylinder, which is connected to the upper rear of the
blade, retracts and causes the right end of the blade to move downward or
TILT RIGHT.
When the dozer control lever is released, the pilot oil at the left end of the
tilt spool is drained. The spring at the right end of the tilt spool moves the
spool to the HOLD position. In the HOLD position, the oil in the head
and rod ends of the tilt cylinder is blocked. The tilt angle of the blade will
not change until the dozer control lever is moved.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 11/60
•Tilt circuit relief valve With the tilt spool in the TILT RIGHT position, flow from the small
section of the pump does not combine with flow from the large section.
Pilot oil at the left end of the tilt spool has moved the spool to the right.
Flow from the small section of the pump goes around the tilt spool and is
sent to the rod end of the tilt cylinder. Because the small section flow
cannot combine with the oil in the center chamber, the dump valve for the
dozer lift circuit does not control the tilt circuit pressure. Instead, the tilt
relief valve (at the top of the valve body) is used to limit the pressure in
the tilt circuit. When the tilt cylinder pressure increases to 24300 kPa
(3525 psi), the pilot valve for tilt relief will open and drain the spring
chamber behind the valve spool. This condition permits the valve spool
to open and limit the pressure in the tilt circuit.
STMG 692 - 11 -
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 12/60
STMG 692 - 12 -
10/97
7
• Lift circuit
components
FROM LARGE PUMP
LIFT RELIEFVALVE
LIFT SPOOL
DOZER LIFT SPOOLHOLD
Bulldozer Lift Circuit
The lift spool has four positions: RAISE, HOLD, LOWER, and FLOAT.
The lift spool is manually operated by the blade control lever. Movement
of the lever to the rear sends pressure oil to the rod end of the lift
cylinders, causing the blade to RAISE. Forward movement of the dozer
control lever sends pressure oil to the head end of the lift cylinders,
causing the blade to LOWER. If the lever is pushed forward past the
LOWER position, the lever will go into the FLOAT position. The FLOAT
position is the only position with a detent. In the FLOAT position, theblade is free to move up or down according to outside forces.
In the HOLD position, oil from the large section of the pump goes to the
lift spool where it joins the oil from the tilt circuit.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 13/60
STMG 692 - 13 -
10/97
8
• HOLD position
ROD END LIFT CYLINDER
HEAD END LIFT CYLINDER
ROD END
TILT CYLINDER
HEAD END
TILT CYLINDER
LIFT SPOOL
LIFT RELIEF
VALVE
TILT
SPOOL
SHUTTLE
VALVE
BALL
RESOLVER
FROM SMALL PUMP
FROM LARGE PUMP
FROM PILOT VALVE
DOZER CONTROL VALVEHOLD
When the valve spools in both the dozer control valve and the ripper
control valve are in the HOLD position, the pressure of the supply oil
(from both the small and large sections of the pump) through the dozer
control valve is maintained at approximately 700 kPa (100 psi).
The dozer lift spool is a "closed-center" spool, and the blade tilt spool is
an "open-center" spool. In this view, both spools are in the HOLD (or
center) position. Oil from the large pump section enters the valve and
starts to fill the chamber in the center of the valve body. Flow from the
small section of the pump enters the valve body, flows around the open-center tilt spool, and joins with the oil from the large section in the center
chamber. All the oil around the closed-center lift spool is blocked.
Because both spools are in the HOLD position, no oil flows to or from the
lift and tilt cylinders, and the load check valves cannot open.
.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 14/60
• Dump valve The spring for the dump valve plus the pressure of the oil in the tank have
a combined force that provides a restriction to flow. When the pressure in
the center chamber increases above the spring force plus the tank oil
pressure, the dump valve will open and permit the combined flow from
the two sections of the pump to return to the tank. With both spools in the
HOLD position, the dump valve provides a constant low system pressure
which is available for instant implement response or for "feathering"
action of the controls when activated by the operator.
The shuttle valve resolves which hydraulic function (dozer raise and
lower or ripper) will provide pressure feedback to the spring chamber of
the dump valve. The shuttle valve is spring biased to the dozer lift and
lower function. The stem shifts to the right when oil pressure is directed
to the ripper valve port when the ripper function is requested by the
operator or during an engine overspeed condition. When the lift spool is
in the hold or center position, the spring chamber of the dump valve isconnected to the tank. Tank pressure is transmitted through passages in
the lift and lower spool that travel through the ball resolver valve and the
shuttle valve before filling the spring chamber of the dump valve. During
blade lift and lower functions, the cylinder load pressure signal is
transmitted to the ball resolver valve, through the shuttle valve, to the
spring chamber of the dump valve. This path is the same as when the
spool is in the HOLD position. The cylinder load pressure signal is from
the lift cylinder rod end during lift and from the cylinder head end during
lower or float. The ball resolver valve directs the higher of either the
cylinder rod or head end pressure to the shuttle valve.
Because the shuttle valve spool is moved completely to the left, pressure
oil from the center chamber cannot fill the spring chamber of the dump
valve. For this reason, only the dump valve springs plus the tank oil
pressure are regulating the pressure in the center chamber. This pressure
will remain low as long as the lift and tilt spools are in the HOLD
position, and the ripper circuits are not activated.
STMG 692 - 14 -
10/97
• Shuttle valve
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 15/60
STMG 692 - 15 -
10/97
9
• Dozer RAISE
FROM LARGE PUMP
LIFT RELIEF
VALVE
DOZER LIFT SPOOLRAISE
LIFT SPOOL
This view of the dozer control valve shows spool movement and oil flow
when the control lever is moved to the RAISE position. Movement of the
dozer lift spool to the RAISE position opens the chamber at the left center
of the spool, which is connected to the rod end of the lift cylinders. Since
the oil around the lift spool is no longer blocked, pressure oil from the
center chamber of the valve body can open the load check valve and flow
around the lift spool to the rod end of the lift cylinders.
At the same time that pressure oil is sent to the lift cylinders, oil also
flows to the ball resolver valve. The ball resolver valve operates similarlyto a check valve. With the lift spool in the RAISE position, the ball
resolver valve permits pressure oil to flow to the shuttle valve, but blocks
flow to the drain passage at the right end of the ball resolver valve.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 16/60
• Dump valve converted
to pilot operated reliefvalve
During blade RAISE, the lift cylinder rod end pressure is transmitted to
the spring chamber of the dump valve through the ball resolver and the
shuttle valve. The dump valve uses the rod end cylinder pressure
combined with the spring to move the dump valve to the right until the
supply pressure is 700 kPa (100 psi) above the cylinder pressure. If the
pressure in the dump valve spring chamber reaches 22750 kPa (3300 psi)
due to cylinder load or an end stroke condition, the relief valve will open
and allow spring chamber oil to drain to the tank. When oil is allowed to
drain from the dump valve spring chamber, the dump valve moves to the
left and allows pump flow to pass around the dump valve to the tank.
This operation prevents the system pressure from exceeding 22750 kPa
(3300 psi) during blade RAISE or LOWER.
An additional condition can exist during dozer operation which is referred
to as "feathering the blade." If the operator moves the control lever a
small distance to gradually raise the blade, flow to the cylinders goesthrough the throttling slots in the lift spool. Flow through the throttling
slots can create the same effect as an orifice by restricting the flow of oil
to the lift cylinder and and to the spring chamber of the dump valve. This
restriction to flow causes a pressure difference between the oil in the
center chamber of the valve body (system pressure) and the oil in the
spring chamber of the dump valve (cylinder pressure). If the pressure
difference is greater than the spring force, the dump valve will open and
permit some of the pump flow to return to the tank.
With the lift spool in the RAISE position, the load check valve is used to
prevent reverse oil flow from the cylinders which can cause "cylinderdrift."
When the lift spool is held in the FLOAT position by the detents on the
end of the spool, the load check valve is open. The supply oil in the
center chamber goes through the open load check valve to the head end of
the lift cylinders. The center chamber is also open to the tank. The
weight of the blade is the force that moves the dozer down. The oil from
the rod end of the lift cylinders is also open to the tank when the lift spool
is in the FLOAT position. When an outside force moves the blade up, the
pressure of the oil in the rod end of the lift cylinders decreases as the rodsretract. The pressure of the oil in the rod end circuit is less than the
pressure in the head end circuit. The higher pressure in the head end
circuit opens a makeup valve to fill the rod end circuit as needed.
The dozer control lever must be moved from the FLOAT position to move
the lift spool in the dozer control valve from the FLOAT position.
STMG 692 - 16 -
10/97
• Blade "feathering"
• Load check valve
prevents drift
• FLOAT position
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 17/60
STMG 692 - 17 -
10/97
10
• Dump valve has fourfunctions:
1. Release pump flow
with levers inHOLD
2. Pressurecompensation
valve for pump
ROD END LIFT CYLINDER
HEAD END LIFT CYLINDER
DOZER CONTROL VALVEHOLD
ROD END
TILT CYLINDER
HEAD ENDTILT CYLINDER
LIFT SPOOL
LIFT RELIEF
VALVE
TILT SPOOL
DUMP
VALVE
FROM SMALL PUMP
FROM LARGE PUMP
FROM PILOT VALVE
The dump valve in the dozer control valve has four different functions in
the dozer lift and ripper circuits.
When the blade lift and ripper control spools are in the HOLD position,
the pressure in the spring chamber of the dump valve is the same as tank
pressure plus 700 kPa (100 psi), which is the value of the spring. During
blade RAISE or LOWER, the pressure in the spring chamber of the dump
valve is the same as the pressure in either the head end or rod end of the
lift cylinders. This pressure is felt through the ball resolver valve and the
shuttle valve. With the cylinder pressure plus the spring force behind thedump valve, the supply pressure will be raised to a level of 700 kPa
(100 psi) above the cylinder pressure. Flow control and fine modulation
are possible because of the constant 700 kPa (100 psi) pressure behind the
dump valve.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 18/60
3. Flow control
4. Relief valve formain system
operation
When the ripper control spools are activated, pilot oil is sent to the right
end of the shuttle valve and moves the shuttle valve to the left. When the
shuttle valve is moved, supply oil fills the spring chamber behind the
dump valve. The pilot valve and the dump valve now function as the
relief valve for the ripper circuit. Because oil from the drive end pump
section goes to both a passage in the dozer control valve and to the ripper
control valve, the pressure of the oil is always the same in both places.
When the lift spool is in the RAISE or LOWER position, cylinder
pressure is transmitted to the spring chamber of the dump valve through
the ball resolver valve and the shuttle valve. A pressure relief valve is
located within the dump valve spring chamber. This valve will lift off its
seat and allow the spring chamber oil to drain when the pressure in the
spring chamber reaches 22750 kPa (3300 psi). When the relief valve
opens, an imbalance exists between the pressure in the center chamber
and a combination of the dump valve spring and the pressure in the spring
chamber. A balance is achieved when the dump valve shifts to the left
allowing oil in the center chamber to drain until the pressure in the center
chamber is equal to the dump valve spring plus the spring chamber
pressure. This method of controlling maximum system pressure is called
a pilot operated relief valve.
STMG 692 - 18 -
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 19/60
STMG 692 - 19 -
10/97
11
• Quick-drop valve in
RAISE position
QUICK-DROP VALVERAISE
ROD END OIL
HEAD END OIL
Quick-drop Valves
All flow to and from the lift cylinders must go through the quick-drop
valves that are installed on top of each cylinder. The primary function of
the quick-drop valve is to allow rapid blade lower without voiding the
head end of the lift cylinders. Minimizing the amount of cylinder voiding
reduces the time delay that will occur when a rapid blade lower is
followed by an operator request for blade down pressure. The quick-drop
valve is activated when a sufficient pressure difference occurs between the
cylinder rod end oil and the oil in the spring cavity. This pressuredifference is caused by rod end oil flow through an orfice in the quick-
drop valve. The quick-drop valve is de-activated by high pressure in the
head end felt through a slot in the spool. The quick-drop valves help to
control four functions of the bulldozer: RAISE, LOWER at slow speeds,
rapid LOWER, and LOWER with down pressure.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 20/60
When the dozer control lever is moved to the RAISE position, supply oil
enters the quick-drop valve through an inlet and an orifice, flows through
a sleeve, and is directed to the rod end of the lift cylinder. A small
amount of oil passes through another orifice and fills the spring chamber
behind the plunger. The pressure of this oil adds to the force of the
spring, which pushes the valve against the sleeve. This condition causes
all the oil entering the quick-drop valve to be directed to the rod end of
the lift cylinders and all the oil from the head end of the lift cylinders to
return to the tank.
STMG 692 - 20 -
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 21/60
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 22/60
When the dozer control lever is moved to the LOWER position, supply
oil enters the quick-drop valve through a port and flows to the head end of
the lift cylinders. The oil being pushed from the rod end of the cylinders
returns through the control valve to the tank. Because of the weight of the
blade and the resistance to flow, the pressure of the rod end oil may be
higher than the head end oil. The flow of oil through the orifice is not
high enough to create a large pressure difference between the oil in the
port and the oil behind the plunger. The spring holds the valve against the
sleeve and all the oil leaving the rod end of the lift cylinder returns
through the control valve to the hydraulic tank.
STMG 692 - 22 -
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 23/60
STMG 692 - 23 -
10/97
13
• Quick-drop LOWER
QUICK-DROP VALVEQUICK-DROP
ROD END OIL
HEAD END OIL
When the dozer control lever exceeds approximately 75% of lever travel
and the cylinder head end pressure is low, the quick-drop valve is
activated and the blade drops very rapidly.
The oil flow for a quick drop is the same as slow lower except that some
of the oil leaving the rod end of the lift cylinder is directed into the head
end of the cylinder. When the flow of oil through the orifice creates
enough pressure differential between the port and the plunger spring
chamber, the valve and plunger shift to the left and permit oil leaving the
rod end to be added to the supply oil filling the head end of the liftcylinders. As mentioned earlier, during a rapid blade drop, the rod end
pressure will be higher than the head end due to the blade weight. The
resulting pressure differential and valve movement allow the rod end oil
to flow to the head end of the cylinder and minimize cylinder voiding.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 24/60
STMG 692 - 24 -
10/97
14
• LOWER with downpressure
QUICK-DROP VALVELOWER WITH DOWN PRESSURE
ROD END OIL
HEAD END OIL
When down pressure must be applied to the blade, the operator moves the
dozer control lever to the LOWER position. Pressure oil from the dozer
control valve is sent to the head end of the lift cylinders. At the same
time, oil fills the chamber at the left end of valve spool. As the head end
pressure and resistance to downward movement increase, pressure in the
chamber at the left end of the valve spool moves the plunger to the left
against the force of the spring and moves the valve spool completely to
the right. All the pressure oil from the dozer control valve is then sent to
the head end of the lift cylinders. All the rod end oil is returned through
the dozer control valve to the tank.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 25/60
STMG 692 - 25 -
10/97
15
• Fan pumps part of
hydraulic system
• Demand control fansystem equipped withtandem axial pumps
FAN
PUMPS
SOLENOID
TANK
FAN DRIVE
MOTOR
RADIATOR
OIL COOLER
OIL
COOLER
BYPASS
VALVE
FAN DRIVE
HYDRAULIC SYSTEM
TO PILOT VALVES
Fan Drive Hydraulic System
The demand control fan system on the D11R is considered part of the
implement hydraulic system because the fan pumps pull oil from the
implement hydraulic tank and send some of the oil to the pilot control
valves. Pilot oil shifts the blade tilt spool in the dozer control valve and
also shifts the spools in the ripper control valve to control ripper lift and
ripper tip.
The tractor is equipped with two hydraulic pumps for the demand controlfan system. The tandem axial (variable displacement) pumps are located
on the right rear side of the engine and are driven off the flywheel. The
system adjusts the fan speed to match the cooling system demands based
on an input signal to the engine Electronic Control Module (ECM) from
the engine coolant temperature sensor.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 26/60
• Ripper control valve(arrow)
16
Ripper and Pilot Circuits
The ripper control valve (arrow) has two spools (lift and tip), two makeup
valves (one for the head end of the ripper lift cylinders and one for the
head end of the ripper tip cylinders), and a load check valve. The ripper
lift spool is operated with pilot oil pressure and has three positions:RAISE, HOLD, and LOWER. The ripper tip spool is operated by pilot
pressure oil and also has three positions: SHANK IN, HOLD, and
SHANK OUT. The valve spools have no detent positions.
Movement of the ripper control lever to the left causes the ripper to lift
and movement to the right causes the ripper to lower. When the ripper
control lever is moved forward, the ripper tip moves toward the machine
(SHANK IN). Pulling the ripper control lever toward the rear causes the
ripper tip to move away from the machine (SHANK OUT).
STMG 692 - 26 -
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 27/60
STMG 692 - 27 -
10/97
17
• Ripper RAISE
RIPPER TIPSPOOL
RIPPER LIFTSPOOL
LIFTCYLINDERS
MAKEUP VALVEFOR HEAD END
OF LIFTCYLINDERS LOAD
CHECK VALVE
RIPPERAND PILOT SYSTEMS
RAISEFROM
FAN PUMP
TO DOZERCONTROL VALVE
TO SHUTTLEVALVE
When the ripper control lever is moved to the RAISE position, pilot oil is
directed to the upper end of the lift spool and moves the spool down. The
supply oil opens the load check valve, goes around the lift spool, and
flows to the rod end of the ripper lift cylinders, causing the cylinder rods
to retract and the ripper to raise.
The oil that is forced from the head end of the ripper lift cylinders flows
through the ripper control valve, around the lift spool, and returns to the
tank.
When the ripper control lever is released, the pilot oil in the upper spring
chamber is drained. The lower spring returns the ripper lift spool to the
HOLD position. The oil is blocked and holds the ripper in position until
the ripper control lever is moved again.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 28/60
STMG 692 - 28 -
10/97
18
• Makeup valve
LIFTCYLINDERS
LOADCHECK VALVE
RIPPER TIPSPOOL
RIPPER LIFTSPOOL
MAKEUP VALVEFOR HEAD END
OF LIFTCYLINDERS
RIPPERAND PILOT SYSTEMS
LOWERFROM
FAN PUMP
TO DOZERCONTROL VALVE
TO SHUTTLEVALVE
The makeup valve operates when the ripper is lowered quickly. When the
lift spool is in the LOWER position, supply pressure oil is in the head end
of the ripper lift cylinders and oil is returning from the rod end of the
cylinders to the tank.
If the cylinder head end supply pressure becomes less than the tank
pressure due to the weight of the ripper, the makeup valve opens to let the
tank oil add to the supply oil. This condition prevents cavitation in the
head end of the lift cylinders and prevents delays in the operation of the
ripper.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 29/60
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 30/60
STMG 692 - 30 -
10/97
20
• SHANK IN
TIP
CYLINDERS RIPPER TIPSPOOL
RIPPER LIFTSPOOL
MAKEUP VALVEFOR HEAD END
OF LIFT
CYLINDERS LOADCHECK VALVE
RIPPERAND PILOT SYSTEMS
SHANK INFROM
FAN PUMP
TO DOZERCONTROL VALVE
When the ripper control lever is moved to the SHANK IN position, pilot
oil is directed through the ripper control valve to the upper end of the
ripper tip spool. The pressure of the pilot oil moves the ripper tip spool
down. The pump oil opens the load check valve and goes around the lift
and tip spools to the head end of the ripper tip cylinders, causing the rods
to extend and move the ripper tip toward the machine.
The oil that is pushed from the rod end of the ripper tip cylinders flows
through the ripper control valve and returns to the tank
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 31/60
STMG 692 - 31 -
10/97
21
• Pilot control valves
• Dump valve acts as
ripper circuit reliefvalve
RIPPER TIPSPOOL
RIPPER LIFTSPOOL
LIFTCYLINDERS
MAKEUP VALVEFOR HEAD END
OF LIFTCYLINDERS LOAD
CHECK VALVE
RIPPERAND PILOT SYSTEMS
RAISEFROM
FAN PUMP
TO DOZERCONTROL VALVE
TO SHUTTLEVALVE
Three pilot valves are located below the dozer and ripper control levers to
the right of the operator. The closed-center pilot valves control the dozer
tilt, ripper lift, and ripper tip functions. No oil flows through the pilot
valves when the spools are in the HOLD position. Each valve is centered
by springs.
When the ripper circuit is activated by the operator, pilot oil from the fan
pump flows through the pilot valve to one end of the lift spool or tip
spool. At the same time, pilot oil flows to the shuttle valve in the dozer
control valve. The shuttle valve shifts to the right and allows oil to flowto the spring chamber of the dump valve which now functions as the relief
valve for the ripper circuit. When the shuttle valve is shifted, the oil from
both the small and large pumps is directed to the load check valve in the
ripper control valve.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 32/60
STMG 692 - 32 -
10/97
22
• TILT RIGHT
PILOT SYSTEM
BLADE TILT RIGHTFROM
FAN PUMP
RIGHT TILT
CYLINDER
FROM LARGE PUMP
The tilt circuit receives oil from the small section of the pump. When the
circuit is not in use, this oil combines with the oil from the large section of
the pump for the lift circuit. The tilt valve spool has three positions:
TILT RIGHT, HOLD and TILT LEFT.
The tilt valve spool is hydraulically operated by pilot oil pressure from the
pilot valve that is controlled by the dozer control lever. When the dozer
control lever is moved to the TILT RIGHT position, the linkage moves the
pilot spool down. This movement allows pilot oil to flow to the left end
of the tilt spool in the dozer control valve. Pilot pressure at the left end of the tilt spool moves the spool to the right and permits oil from the small
section of the pump to flow to the rod end of the tilt cylinder. As the rod
end pressure increases, the rod retracts and tilts the blade to the right. Oil
from the head end of the tilt cylinder is returned through the dozer control
valve to the tank.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 33/60
STMG 692 - 33 -
10/97
23
• Dual tilt valve has
three modes:
- Dual tilt
- Single tilt
- Blade pitch
• Solenoid valvecontains twopositioning coils
• Trigger switch
activates S1 coil
• Toggle switch
activates S2 coil
S1S2
DUAL TILT VALVE
TILT
CYLINDERS
PILOT OIL FROM
FAN PUMP
FROM BLADE
TILT VALVE
HOLD
TO HEAD END
TO ROD END
Dual Tilt Valve
The dual tilt attachment provides the blade tilt circuit with three different
modes of operation: DUAL TILT, SINGLE TILT, and BLADE PITCH.
The control valve is located between the radiator grill doors and the
radiator on the left side of the machine. The valve is activated by pilot oil
pressure from the solenoid valve. The dual tilt valve contains a spring
centered, hydraulically actuated spool valve and an electrically actuated
solenoid control valve.
The solenoid valve contains two coils and has three different positions.
When neither solenoid is activated, the system operates in the DUAL
TILT mode. When the toggle switch on the dozer control lever is moved
forward, the S2 coil in the solenoid valve is energized and the system
operates in the SINGLE TILT mode. When the trigger switch on the
dozer control lever is depressed, the system energizes the S1 coil in the
solenoid and activates the BLADE PITCH mode.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 34/60
• Tilt cylinders contain
bypass valvesBoth the left and right tilt cylinders pistons contain bypass valves. These
valves allow the completion of the tilt operation. When one of the
cylinders reaches the end of its travel, the oil goes through the bypass
valve to continue filling the other cylinder.
STMG 692 - 34 -
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 35/60
STMG 692 - 35 -
10/97
24
• Dual tilt operation
• DUAL TILT RIGHT
• Cylinders move in
opposite directions
FROM TILT
CONTROL VALVE
TO TILT
CONTROL VALVE FROM FAN
PUMP
FROM TRIGGER SWITCH
FROM TOGGLE SWITCH
LEFT TILT
CYLINDER
RIGHT TILT
CYLINDERTO HEAD END
TO ROD END
DUAL TILT CIRCUITDUAL TILT RIGHT
When the toggle switch on the dozer control lever is in the rear (OFF)
position and the trigger switch is not depressed, neither coil in the
solenoid valve is energized. The control valve is operating in the DUAL
TILT mode. In the DUAL TILT mode, oil flow is blocked at the solenoid
valve and the dual tilt directional spool remains centered by the spring
force.
When the operator moves the dozer control lever to the TILT RIGHT
position, pump oil from the dozer control valve tilt circuit is sent to the
head end of the left tilt cylinder. This condition causes oil from the rodend of the left tilt cylinder to be forced back to the dual tilt control valve.
The oil travels around the spool and is directed to the rod end of the right
tilt cylinder. As the right tilt cylinder retracts, the oil in the head end of
the cylinder is directed back through the dual tilt control valve and the
dozer tilt control valve to the tank. Movement of the tilt cylinders in
opposite directions causes the blade to tilt.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 36/60
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 37/60
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 38/60
STMG 692 - 38 -
10/97
26
• Trigger switchenergizes S1 coil
• BLADE PITCHFORWARD
FROM TILT
CONTROL VALVE
TO TILT
CONTROL VALVE
LEFT TILT
CYLINDER
RIGHT TILT
CYLINDERTO HEAD END
TO ROD END
FROM FAN
PUMP
FROM TRIGGER SWITCH
FROM TOGGLE SWITCH
DUAL TILT CIRCUITBLADE PITCH FORWARD
To change the blade pitch, the trigger switch on the dozer control lever is
depressed and the S1 coil in the solenoid valve is energized. The valve
allows pilot oil from the solenoid valve to be directed to the lower end of
the directional spool and opens the upper end of the spool to drain. The
valve spool then shifts up against the spring force to the BLADE PITCH
mode.
For BLADE PITCH FORWARD, flow from the dozer tilt circuit is sent to
the head end of the left tilt cylinder. As the cylinder extends, oil from the
rod end is pushed back to the dual tilt valve and is directed to the head endof the right tilt cylinder. The oil in the rod end of the right tilt cylinder is
pushed back through the dual tilt valve to the hydraulic tank. As both tilt
cylinders extend, the blade pitches forward. The cylinder extension rate is
not the same between the left and right tilt cylinders. This difference is
caused by the unequal volume of oil entering the left cylinder head end
and the volume being pushed from the left cylinder rod end. The left rod
end displaces a volume equivalent to the volume entering the left head
end of the cylinder minus the cylinder rod volume.
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 39/60
• BLADE PITCH haspriority
Since the right tilt cylinder head end receives oil from the rod end of the
left cylinder, the right cylinder will extend at a slower rate than the left
cylinder.
When the dozer control lever is released, the oil is blocked at the control
valve and the blade remains pitched forward until the control lever is
moved again.
One additional characteristic of the BLADE PITCH mode is that the
trigger switch has priority over the toggle switch. Therefore, if the trigger
switch is depressed while the machine is operating in the SINGLE TILT
mode, the S2 coil for single tilt is de-energized and the S1 coil for the
blade pitch is energized. This feature ensures that the BLADE PITCH
can always be changed, regardless of the toggle switch position.
STMG 692 - 39 -
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 40/60
27
CONCLUSION
This presentation has discussed the major features of the implement
hydraulic system for the D11R Track-type Tractor equipped with the
3508B engine. When used in conjunction with the service manual for this
tractor, the information in this package should help the servicemancorrectly diagnose a problem in the implement hydraulic system.
For service repairs, adjustments, and maintenance, refer to the Operation
and Maintenance Manual, Service Manual, and other related service
publications.
STMG 692 - 40 -
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 41/60
1. Model view
2. Component locations
3. Hydraulic tank
4. Dozer control valve (component locations)5. Dozer tilt spool (HOLD)
6. Dozer tilt spool (TILT RIGHT)
7. Dozer lift spool (HOLD)
8. Dozer control valve (HOLD)
9. Dozer lift spool (RAISE)
10. Dozer control valve (HOLD)
11. Quick-drop valve (RAISE)
12. Quick-drop vale (LOWER)
13. Quick-drop valve (QUICK-DROP)
14. Quick-drop valve (LOWER WITH /DOWN
PRESSURE)15. Fan drive hydraulic system
16. Ripper valve
17. Ripper and pilot systems (RAISE)
18. Ripper and pilot systems (LOWER)
19. Ripper and pilot systems (RAISE)
20. Ripper and pilot systems (SHANK IN)
21. Ripper and pilot systems (RAISE)
22. Pilot system (TILT RIGHT)
23. Dual tilt valve (HOLD)
24. Dual tilt valve (DUAL TILT RIGHT)25. Dual tilt valve (SINGLE TILT RIGHT)
26. Dual tilt valve (PITCH FORWARD)
27. Model view
SLIDE LIST
STMG 692 - 41 -
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 42/60
D U A L T I L T
C O N T R O L V A L V E
Q U I C K - D
R O P
V A L V E S
R I P P E R
C O N T R O L V A L
V E
H Y D R A U L I C
T A N K
P I L O T V A L
V E
A N D D O Z E
R
C O N T R O L V A L V E
I M P L E M E N T
P U M P
F A N M O T O R A N D
M A K E U P V A L V E
O I L C O O L E R A N D
B Y P A S S V A L V E
F A N
P
U M P S
I M P
L E M E N T H Y D R A U L I C S Y S T E M C O
M P O N E N T S
STMG 692 - 42 - Serviceman's Handout No. 1
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 43/60
F R O M S M A L L P U M P
F R O M L A R G E P U M P
F R O M P I L O T V A
L V E
R O D E N D L I F T C Y L I N D E R
H E A D E N D L I F T C Y L I N D E R
R O D E N D
T I L T C Y L I N D E R
H E A D E N D
T I L T C Y L I N D E R
L I F T
S P O O L
L I F T R E L I E F
V A L V E
T I L T
S P O O L
D O Z E R C
O N T R O L V A L V
E
H O L D
STMG 692 - 43 - Serviceman's Handout No. 2
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 44/60
A
A
S E C T I O N A - A
F R O M S M A L L P U M P
F R O M L A R G E P U M P
F R O M P I L O T V
A L V E
D O Z E R T I L T S P O O L
H O L D
T I L T R I G H T
T I L T L E F T
STMG 692 - 44 - Serviceman's Handout No. 3
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 45/60
A
A
S E C T I O N A - A
D O Z E R
T I L T S P O O L
T I L T R I G H T
T I L T R I G H T
T I L T L E F T
F R O M S M A L L P U M P
F R O M L A R G E P U M P
F R O M P I L O T V
A L V E
STMG 692 - 45 - Serviceman's Handout No. 4
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 46/60
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 47/60
R O D E N D L I F T C Y L I N D E R
H E A D E N D L I F T C Y L I N D E R
D O Z E R C O N T R O L V A L V E
H O L D
R O D E N D
T I L T C Y L I N D E R
H E A D
E N D
T I L T C Y L
I N D E R
L I F T S P O O L
L I F T R E L I E F
V A L V E T
I L T
S P O O L
D U M P
V A L V E
F R O M S M A L L P U M P
F R O M L A R G E P U M P
F R O M P I L O T V A L V E
STMG 692 - 47 - Serviceman's Handout No. 6
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 48/60
Q U I C K - D R O P V A L V E
R
A I S E
R O D E N D O I L
H E A D E N D O I L
STMG 692 - 48 - Serviceman's Handout No. 7
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 49/60
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 50/60
Q U I C K - D R O P V A L V E
Q U I C
K - D R O P
R O D E N D O I L
H E A D E N D O I L
STMG 692 - 50 - Serviceman's Handout No. 9
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 51/60
Q U I C K - D
R O P V A L V E
L O W E R W I T H
D O W N P R E S S U
R E R
O D E N D O I L
H E A D E N D O I L
STMG 692 - 51 - Serviceman's Handout No. 10
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 52/60
F
A N
P U
M P S
S O L E N O I D
T A N K
F A N
D R I V E
M O
T O R
R A D I A T O R
O I L C O O L E R
O I L
C O O L E R
B Y P A S S
V A L V E
F A N
D R I V E
H Y D R A U L I C S Y S T E M
T O P I L O T V A L V E S
STMG 692 - 52 - Serviceman's Handout No. 11
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 53/60
R I P P E R T I P
S P O O L
R I P P E R L I F T
S P O O L
L I F T
C Y L I N
D E R S
M A K E U P V A L V E
F O R H E A D E N D
O F L I F T
C Y L I N D E R S
L O A D
C H E C K
V A L V E
R I P P E R
A N D
P I L O T S Y S T E M S
R A I S E
F R O M
F A N P U M P
T O D O Z E R
C O N T R O L V A L V
E
T O S H U
T T L E
V A L V E
STMG 692 - 53 - Serviceman's Handout No. 12
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 54/60
T I P
C Y L I N
D E R S
R I P P E R T I P
S P O O L
R I P P E R L I F T
S P O O L
M A K E U P V A L V E
F O R H E A D E N D
O F L I F T
C Y L I N D E R S
L O A D
C H E C K
V A L V E
R I P P E R
A N D
P I L O T S Y S T E M S
S H A N K I N
F R O M
F A N P U M P
T O D O Z E R
C O N T R O L V A L V
E
STMG 692 - 54 - Serviceman's Handout No. 13
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 55/60
P I L O T S Y S T E M
B L A D E T I L T R I G H T
F R O M
F A N P U M P
R I G H T
T I L T
C Y L I N D E R
F R O M L A R G E P U M P
STMG 692 - 55 - Serviceman's Handout No. 14
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 56/60
S 1
S 2
D U
A L T I L T V A L V E
T I L T
C Y L I N D
E R S
P I L O T O I L F R O M
F A N P U M P
F R O M B L A
D E
T I L T V A L V E
H O L D
T O H E A D
E N D
T O R O D E N D
STMG 692 - 56 - Serviceman's Handout No. 15
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 57/60
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 58/60
F R O M T I L T
C O N T R O L V A L V E
T O T I L T
C O N T R O L V A L V E
F R O M F A N P U M P
F R O M T R I G G E R
S W I T C H
F R O M T O G G L E S W I T C H
L E F T T I L T
C Y L I N D E R
R I G H T T I L T
C Y L I N D E R
T O H E A D E N D
T O R O D E N D
D U A L T I L T C I R C U I T
S I N G L E T I L T R I G H T
STMG 692 - 58 - Serviceman's Handout No. 17
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 59/60
F R O M T I L T
C O N T R O L V A L V E
T O T I L T
C O N T R O L V A L V E
L E F T T I L T
C Y L I N D E R
R I G H T T I L T
C Y L I N D E R
T O H E A D E N D
T O R O D E N D
F R O M F A N
P U M P
F R O M T R I G G E R S W I T C H
F R O M T O G G L E S W I T C H
D U A L T I L T C I R C U I T
B L A D E P I T C H F O R W A R D
STMG 692 - 59 - Serviceman's Handout No. 18
10/97
8/9/2019 D10R Implement Systems
http://slidepdf.com/reader/full/d10r-implement-systems 60/60