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Transcript of 08LAB
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8/9/2019 08LAB
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Quiz & Tests
INSTRUCTORREFERENCEBOOK
Service TrainingMALAGA
FrancisMay 1998
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PRE/POST TEST
2Page:
MALAGA TRAINING CENTER
320B/330B HYDRAULIC EXCAVATORS
1. Excavator pumps are destroked to meet the demands of asudden load increase to prevent the engine from being lugged by the:
a) Pilot relief valve
b) Combiner and main relief valve
c) PRV valve
d) Crossover valve
e) Servo valves
2. A low pilot system pressure or a worn pilot pump will show up as:
a) Excessive engine lugging
b) Excessive engine smoke
c) Brakes not releasing
d) Slow implements
3. The purpose of the underspeed control is to:
a) Decrease signal pressure so pumps will decrease output
b) Increase signal pressure so pumps will decrease output
c) Decrease signal pressure so pumps will increase output
d) Increase signal pressure so pumps will increase output .
4. The purpose of the track brake valves on the track motors are to preventmotors from freewheeling on a downhill situation by:
a) Providing a restriction on the pressure side of valve
b) Providing a restriction in the return circuit
c) Moving the track brake valve to engage automatically
d) All of the above
5. The underspeed control system is part of the:
a) Track motor hydraulic circuit
b) Pilot system circuit
c) Track brake circuit
d) Electronic control system
6. The valve that provides signal pressure to destroke the main pumps is called:
a) Boom vent valve
b) Overspeed valve
c) Underspeed valve
d) Proportional reducing valve
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3Page:
MALAGA TRAINING CENTER
7. The hydraulic lock lever prevents implement movement in the safe position by:
a) Venting the pilot relief valve and dumping oilb) Return pilot pump flow back to the tank
c) Blocking pilot flow to the pilot control valves
d) Reducing pilot pressure to a valve less than 700 kPa
8. An operator complains of very slow bucket and boom cylinder speeds.After checking cycle times, you agree speeds are too slow. Which ofthe following could be the cause:
a) High pilot pressure
b) Lower pump defective adjustmentc) Low PS signal pressure
d) Defective boom line relief valve
9. An operator complains he cannot swing. The most probable causecould be a defective:
a) Main swing relief valve
b) Left swing line relief valve
c) Swing brake solenoid
d) Right swing line relief
10. On all “B” series excavators all line relief valves are set:
a) Higher than main relief valve pressures
b) Same as main relief valve pressures
c) 700 kPa lower than main relief valve pressures
d) 700 kPa higher than main relief pressures
11. The main system oil filters are placed in the system between:
a) Pump and swing control valve
b) Pilot manifold and pilot control valves
c) Main control valves and oil cooler
d) Oil cooler and hydraulic tank
PRE/POST TEST
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4Page:
MALAGA TRAINING CENTER
12. Protection for the boom structure due to some downward external forceis provided by the:
a) Line relief valve on the boom spool housing
b) Boom anti-drift check valve
c) Main system relief valve
d) Line relief valve in the boom drift reduction valve housing
13. The NFC screw when adjusted counterclockwise too far can cause pumps to gotoward:
a) Minimum angle and increase engine speed by more than 10 rpm
b) Maximum angle and decrease engine speed by more than 10 rpmc) NFC screw will never need to be adjusted
d) Causing engine to go into lug
14. On 300B serie, when adjusting the implement pump destroking pressure :
a) Adjust the power screw in to raise the PS pressure and low the destroking pressure
b) Adjust the power screw out to raise the implement pump destroking pressure
c) Adjust the NFC screw in to raise the implement pump destroking pressure
d) None of the above
15 . When PS pressure to the implement pump regulator increases:
a) The pump upstroke and engine rpm decreases
b) The pump upstroke and the engine rpm increases
c) The pump destroke and the engine rpm decreases
d) The pump destroke and the engine rpm increses
PRE/POST TEST
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LAB EXERCISES
5Page:
PRODUCT DESCRIPTION
MALAGA TRAINING CENTER
Given a machine, the appropriate service literature, and the 19 and 20Worksheets pages,
- Perform step by step the customer configuration setting through the User Mode
- Perform the clock adjustment
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LAB EXERCISES
6Page:
MALAGA TRAINING CENTER
Test and Adjust Implement pump Destroking Pressure
Machine Model____________________________ Date__________________________________
Serial Number_____________________________ Service Meter Hours_____________________
IMPLEMENT / TRAVEL PUMPS DESTROKING PRESSURES
PUMP POSITION
UPPER PUMP
LOWER PUMP
SPECIFICATION ACTUAL PS PRESSURE
PUMP & PUMP CONTROLS
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PUMP & PUMP CONTROLS
LAB EXERCISES
MALAGA TRAINING CENTER
Test and Adjust Negatif Flow Control (NFC)
Machine Model____________________________ Date__________________________________
Serial Number_____________________________ Service Meter Hours_____________________
NEGATIF FLOW CONTROL ADJUSTMENT
PUMP POSITION
UPPER PUMP
LOWER PUMP
SPECIFICATION ACTUAL PS PRESSURE
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LAB EXERCISES
8Page:
PILOT SYSTEM
MALAGA TRAINING CENTER
Test and Adjust Pilot System Relief Valves
Machine Model____________________________ Date__________________________________
Serial Number_____________________________ Service Meter Hours_____________________
PRESSURE TESTS
TESTS
Pilot system pressure
(w/engine at high idle)
SPECIFICATIONS ACTUAL
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LAB EXERCISES
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IMPLEMENT & TRAVEL SYSTEM
MALAGA TRAINING CENTER
Test and Adjust Implement & Travel System Relief Valves
Machine Model____________________________ Date__________________________________
Serial Number_____________________________ Service Meter Hours_____________________
PRESSURE TESTS
TESTS
Implement system pressure
(w/engine at high idle)
Travel System Pressure
(w/engine at high idle)
SPECIFICATIONS ACTUAL
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10Page:
MALAGA TRAINING CENTER
LAB EXERCISES
IMPLEMENT & TRAVEL SYSTEM
Test and Adjust Tow Speed Track Automatic Change Pressure
Machine Model____________________________ Date__________________________________
Serial Number_____________________________ Service Meter Hours_____________________
PRESSURE TESTS
TESTS
Travel system pressure
(w/engine at high idle)
Pilot signal Pressure
(w/engine at high idle)
SPECIFICATIONS ACTUAL
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LAB EXERCISES
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INSTRUMENT PANEL
MALAGA TRAINING CENTER
- Access the Service Mode by using the proper security code,
- Explore the list of each group classification parameter values, that includes
PRV and Governor calibrations.
- Test the Electronic Control System using the onboard diagnosticcapabilities,
Given a machine, the appropriate service literature, class notes (InstrumentPanel chapter) and tools:
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12Page:
MALAGA TRAINING CENTER
CASE STUDY
POST TEST
325B Hydraulic Excavator Case Study
You may use the appropriate service literature and class notes tocomplete the case study.
Recurring "low power" complaints from the operator of a 5130B Front
Shovel.
What is the first step that should be performed in a logical
troubleshooting procedure?
What additional steps should be performed to locate the source of the
"low power" complaints?
What components or faults could cause the "low power" complaints?
List the steps you would perform in your troubleshooting procedure to
identify the cause of the "low power" complaint.
DIRECTIONS
SITUATION
QUESTIONS
DIAGNOSTIC CHECKS
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ANSWER SHEET
13Page:
PRE/POST TEST
MALAGA TRAINING CENTER
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