760 Repair Manual - Electrical and Industrial Power ...pub/@eaton/@hyd/...ing the hydraulic lines....

Series 760 Variable Displacement Pump Parts and Repair Manual

2 EATON Series 760 Variable Displacement Pump E-PUPI-TS007-E September 2008

Series 760 Variable Displacement Pump

Introduction

Table of Contents

This Manual provides parts and service information for Eaton® Series 760 Variable Displacement Pumps.Step by step instructions for complete disassembly, inspection and reassembly of the pump are given.

The following recommenda-tions should be followed to insure successful repairs.

• Most repairs require the removal of the pump from the vehicle.

• Cleanliness is extremely important.

• Clean the port areas thor-oughly before disconnect-ing the hydraulic lines.

• Plug the pump ports and cover open hydraulic lines immediately after they have been disconnected.

• Drain the oil and clean the exterior of the pump before making repairs.

• Wash all metal parts in clean solvent.

• Use filtered, moisture-free compressed air to dry the parts. Dot not wipe them dry with paper towels or cloth – lint in a hydraulic system will cause damage.

• Always use new seals when reassembling hydraulic pumps.

• Lubricate new rubber seals with a petroleum jelly (Vaseline®) before installation.

• Torque all bolts over gas-keted joints, then repeat the torquing sequence to make up for gasket compression.

After all repairs are complete it is essential to verify the accuracy of pump repairs on an authorized test stand.

Introduction 2

Features and Applications 3

ID Tag Information 3

Required Tools 4

Parts List 5

Exploded View, Parts Drawings End Cover & Charge Pumps 6 Rotating Kit 7 Housing 8

Disassembly Instructions 9-13

Assembly Instructions 14-20

Special Tools 21-22

3EATON Series 760 Variable Displacement Pump E-PUPI-TS007-E September 2008

D B

A

762AKXXXXXA

C

ID Tag Refer to specific part listings for your Eaton pump when ordering replacement parts. Listings are available from Eaton. Sample tag shows identification.

When ordering replacement parts, you must include the following information:

A Month of Manufacture

B Year of Manufacture

C Specific Serial Number of Unit

D Direction of Input Shaft Rotation observed from

Shaft End of unit

CW=Clockwise

CCW=Counterclockwise

Series 760 Variable Displacement Pump

Features:• 430 Bar Pressure Rating

• Speeds to 3,200 RPM

• Electronic Controls

• Tandem Pump Capability

Typical Applications:• Sewer cleaning

equipment

• Agricultural sprayers

• Tub grinder

• Railway maintenance

• Material handling

• Marine thrusters

• Snow groomers

• Large harvesting machines

• Dozers

• Directional drilling

• The Series 760 Variable Displacement Pump, with a cradle swashplate design, combines the time-tested reliability you expect from Eaton with compact packaging, exceptional control and quiet operation. New pump mounted electronic controls range from the simple Electronic Proportional (EP) Displacement Control to the Solenoid control with electronic swashplate position feedback.

• The Series 760 Pump’s single piece pump hous-ing provides exceptional strength and soundproof-ing. Eaton’s cast iron housing has only one major opening versus two openings for com-petitive pumps. This provides a stronger, more rigid pump housing and reduces the number of gasketed joints.

• A large diameter single servo piston permits pump operation at lower charge pressures, mini-mizing parasitic charge pump losses for increased overall pump efficiency. A large centering springs return the pump to neutral in the event of control pressure loss.

• Integral gerotor type charge pump combines excellent suction/speed capabilities in a compact design. Several displace-ment options are available to suit the needs of every application, including tandem pumps.

• The pump mounted elec-tronics and sensors have been specially designed to meet the rigors of the mobile — off road envi-ronment, including resis-tance to electromagnetic interference or emissions.

• A variety of available drive shaft configurations — straight keyed, splined, or tapered–ensures the proper shaft for your application.

• The serviceable bi-metal bearing plate has steel for high pressure capabil-ity and a bronze bearing face for high speed capabilities.

• SAE auxiliary mounts: “A,” “B,” “B-B” and “C” are available with and without charge pump. SAE “D” mount is only available without charge pump. Excellent torque capability allows high horsepower to work circuits without multiple pump drives.

• The code 62 ports are located on the same side and are available with SAE and Metric threads.

The Eaton® Series 760 Variable Displacement Pump


Required Tools

Disassembly / Assembly

• 1/4 in. Hex Key

• 5/16 in. Hex Key

• 9/16 in. Hex Key

• 5/8 in. Hex Key

• 12 mm Hex Key

• 5/16 in. Socket or End Wrench



• 11/16 in. End Wrench


• 1 in. Socket or End Wrench

• 1-1/4 in. Socket or End Wrench

• Breaker Bar or Ratchet Wrench

• Torque Wrench (200 Max. Capacity)

• Adjustable Pliers

• Screwdrivers (Small & Large)

• Internal Retaining Pliers (str. .047 Tips)

• Internal Retainer Pliers (Str. Tips)

• Dial Indicator with Magnetic Base

• Depth Micrometer with Extensions

• Parallel Bars (2)

• Slide Hammer

• Split Blade Bearing Puller

• Hammer (Steel and Plastic)

• Small Machinist Ruler

• Small Flashlight

• Light Petroleum Jelly

• Suitable Solvents and Cleaners

Special Tools (shown on pages 21-22• Limit Stop for Bearing Cone Installation

• Low Clearance Bearing Puller

• Shaft Seal Bullet/Driver


Parts List

ITEM QTY DESCRIPTION

1 1 Main Housing2 1 Drive Shaft S/A3 1 End Cover, 1604 6 Bolt, Hex HD 1/2-13 Gr 85 1 Gasket, End Cover6 1 Control Valve S/A (Manual)7 1 Gasket, Control (Manual)8 6 Screw, Cap SOC HD 5/16-18 Gr 812 1 Swash/rotating Group S/A13 1 Plate, Valve CW14 1 Plate, Bearing15 1 Ring, Eccentric16 1 Gerotor Assembly17 1 Valve Plate, Charge Pump18 1 Charge Pump Cover S/A19 4 Washer, Sealing20 4 5/16-18 SOC HD Cap Screw21 1 Charge Pump Drive Shaft22 1 Key23 1 Ring, Retaining24 1 O-ring25 1 Bushing, Charge Shaft26 1 Servo Piston S/A Por28 2 Bolt, Hex HD 1/2-13 Gr 829 1 Cover, Servo Piston30 1 Cover, Servo Piston31 8 Screw, Cap SOC HD 5/16-18 Gr 832 2 O-ring34 1 Washer, Nord-lock37 4 O-ring38 2 Spring, Compression39 1 Nut Hex Finished 1/2-1340 1 Cup, Bearing41 A/R Bearing, Shim42 1 Cup, Bearing43 1 Cone, Bearing44 2 Bearing, Swash S/A45 2 Pin, Race46 2 Link, Clocking47 1 Block, Slide

ITEM QTY DESCRIPTION

48 1 LPRV S/A49 1 Centering Bar50 1 Center Bar Pin51 1 Centering Pin S/A52 2 Slider Block53 1 Spring, Compression54 1 Hold Down Arm55 2 Dowel, Hollow56 3 Dowel57 1 Washer58 1 Set Screw 1/2-13 UNC62 1 O-ring Plug S/A63 2 O-ring Plug S/A64 1 O-ring Plug S/A66 9 O-ring Plug S/A67 6 O-ring Plug S/A68 1 Strap,shipping70 1 Feedback Control S/A71 1 Nut, Hex 5/16-1872 1 Washer73 1 Lever, Control77 2 Cap Nut78 1 Relief Valve (B)79 1 Relief Valve (A)80 1 Orifice, CTL Valve (S1)81 1 Orifice, CTL Valve (S2)82 1 Orifice, CTL Valve Supply (P)83 1 Soc Pipe Plug .125-27 NPTF103 2 Soc HD Pipe Plug .125-27 NPSI116 1 Seal, Shaft117 1 Ring, Retaining 2 Shipping Protector (Not Shown) Case 2 Shipping Protector (Not Shown) Port (62) 1 Shipping Protector (Not Shown) Charge 1 Nameplate (Not Shown) 2 Rivet (Not Shown) Assembly Spec Assembly Drawing Assembly Drawing

Seal Kit: 9900294-000

Shaft Seal Kit: 9900390-000


3

4

5

24

15

18

19

20

21

22

25

28

17

16

55

62

63

67

68

7778

4

77

23

63

79

Exploded View

End Cover and Charge Pump


Exploded View

Rotating Kit

2

12

13

14

40

42

43

44

45

46

53

54

56

57

41

45

4446


Exploded View

Housing

1

6

7

8

26

29

30

31

31

32

32

34

38

39

40

47

48

4950 51

52

58

62

66

66

66

66

66

66

66

66

66

676767

67

7172

73

70

8081 82

83

84

6737

102

117116


Disassembly Instructions

Disassembly

The following repair information may be used in the inspection, conversion and repair of the Eaton® Series 760 Heavy Duty Variable Displacement Pump. The Eaton Series 760 is available in one frame size with two displacements and various options. The procedures for the pumps with options that are not shown are basically the same.

Work in a clean area, as the level of cleanliness maintained when repairing the pump may affect pump performance. After washing the parts with clean solvent, blow the parts dry with air. Inspect all mating surfaces.

Replace all damaged parts. Do not use grit paper, files or grinders on finished parts.

Whenever a pump is disassembled, it is preferable to replace all seals. Lubricate new seals with petroleum jelly before installation. Use only clean, recommended hydraulic fluid on finished surfaces before reassembly.

Thoroughly clean the exterior of the pump before disassembly. Make sure all open ports are sealed.

Caution:Disconnect or disable all electrical or mechanical power to the pump before beginning work.

1. Using a filter wrench or large tongue-and-groove pliers, remove the pressure-side filter (if present).

2. With a 1/4-inch hex wrench, remove the four bolts that hold the filter mounting base to the end cover.

3. Remove the O-ring and gasket from the filter head, and discard them.

4. With a 1/4-inch hex wrench, remove the six bolts that hold the control sub-assembly to the main housing.

5. Remove and discard the gasket.

6. With a 1/2-inch deep socket, remove the feedback link from the housing.

7. ONLY remove orifices if orifice size needs to be changed. The type of control and application determine orifice size and location. Orifice sizes are stamped on the face of each orifice. Orifices are staked to retain them in their pockets.

8. Using a 1-3/8-inch socket or closed-end wrench, remove the IVS valve from each side.

9. Using a 1-3/8-inch socket or closed-end wrench, remove the low pressure relief valve (LPRV).


10. Using a 1/4-inch hex wrench, remove the cap screws for the charge pump cover.


11. Using a large pair of tongue-and-groove pliers, remove the charge pump cover. Gently rock the cover back and forth as you pull upward. Remove and discard the O-ring.

12. By hand, remove the charge pump coupling and gerotor star.

Note: The gerotor star is a slip fit on the coupling and is driven by a small key. Use caution not to lose the key. Slide the star from the coupling. It is not necessary to remove the retaining ring from the coupling.

13. By hand, remove the gerotor outer ring from the eccentric ring located in the end cover.

14. Remove the eccentric ring. Note position of the eccentric ring for reassembly. Eccentric ring position in the end cover is used to determine charge pump input rotation.

15. Remove the charge pump valve plate. Note the valve plate position as it is also used to determine charge pump input rotation.

16. Using a 3/4-inch socket, remove the eight end cover retaining cap screws. Use caution as the end cover has an internal preload. If the end cover doesn’t rise when the cap screws are loosened, you may have to tap the end cover to break the gasket seal.

17. Using a hoist and eye bolts, lift the end cover off the housing. Take care not to drop any internal parts such as the valve plate, bearing cup, etc. which may stick to the end cover. Use caution when handling all close tolerance parts.

18. Remove the eye bolts, then carefully turn over the end cover. Remove and discard the gasket from the outer edge of the end cover.

19. Using a prying tool such as a flat-head screwdriver, gently remove the valve plate and dowel pin.

20. Remove the rear bearing cup from the end cover. The bearing cup is a slip fit into the end cover.

21. Remove the rear bearing shims from the end cover. Do not discard shims as they will be re-used.



22. With a 1/4-inch hex wrench, remove the four SAE plugs from the housing.

27. Remove the smaller hold-down arm, washer and spring.

Note: ONLY remove the pressure override passage plugs if you intend to change the pump rotation. Proper orientation in end cover is shown for each direction of rotation below.

28. Remove the bearing plate and two dowel pins from the cylinder barrel. Note: If using a small screwdriver or similar tool to pry the bearing plate from the cylinder barrel, be careful not to scratch or damage the lapped surfaces of the cylinder barrel or bearing plate.

23. With a 1/4-inch hex wrench, remove the 1⁄2-13 set screw.

29. Shown are the bi-metal bearing plate (left) and valve plate (right). Bearing plates are bi-directional and valve plates are unidirectional.

30. Using a 3⁄4-inch socket wrench, remove the jam nut that holds the centering pin in the housing. Remove and discard the lock washers from behind the jam nut.

25. Remove the two hollow dowels from the pump housing.

31. Push the centering pin through the housing while holding it from inside. Remove the centering pin.

26. Remove the two large hold-down springs.

Counterclockwise 1/16” NPTF Plugs

Section D-DSection D-D

Counterclockwise1/16˝ NPTF Plugs

Clockwise1/8˝ NPTF Plugs

D

D

D

D

24. Passage plugs in housing must also be swapped whenever direction of rotation is changed.

Clockwise 1/8” NPTF Plugs



33. Install a low clearance, split-type bearing puller under the rear bearing. Note: See the special tool section for dimensions required to make a low clearance bearing puller.

34. Install the puller on the bearing puller. DO NOT REMOVE THE BEARING YET. Use the puller handle to remove the pump drive shaft, swashplate and rotating group from the pump housing.

35. While supporting the rotating group, remove the slide block from the swashplate.

36. Using the bearing puller, remove the rear bearing.

37. Carefully tip the swashplate and rotating group to rest on their sides, then pull out the pump shaft sub-assembly.

Note: When it is necessary to replace the front bearing, use a hydraulic press to remove the bearing from the shaft. Replacement bearings are pressed to a specific dimension.

38. Using a 1/4-inch hex wrench or bit socket, remove the screws, spacers and strap from one side of the swashplate. Loosen, but do not remove, the other side.

40. Remove the piston sub-assemblies and piston retainer. Place them on a clean, protective surface for inspection and cleaning.

41. By hand, lift the swashplate bearings and clocking links out of the housing.

42. Using a 1/4-inch hex wrench, remove the centering bar pin.

43. Remove the shaft seal by using a large screwdriver or similar tool to drive the seal from the housing.

39. Place the swashplate and rotating group on a clean, flat surface. Using a 1/4-inch hex wrench or bit socket, remove the loosened screws, and carefully remove the swashplate from the rotating group.

32. Lift the centering bar out of the housing.



46. Using a 1/4-inch hex wrench or bit socket, remove the four retaining cap screws from the servo piston cover.

47. Pull off the servo piston cover from one side; remove and discard the O-rings from the cover and communication ports. Repeat these steps for the other side.

45. Remove the front bearing race. It may be a slip-fit or press-fit in the housing.

44. Remove the front bearing race. It may be a slip-fit or press-fit in the housing.

48. Push the servo piston from one side through the cylinder and out of the housing. Remove the seals, cutting them if necessary, and discard.

49. Using a 3/8-inch hex wrench or bit socket, remove the O-ring plug from the housing.


Assembly Instructions

Before re-assembly, clean all parts and sub-assemblies. Inspect and replace damaged parts and subas-semblies. When reworking

parts, do not use course grit paper, files or grinders on finished surfaces. Replace all gaskets and seals. Lubricate all seals with

petroleum jelly for retention during reassembly. Freely lubricate all bearings and finished surfaces with clean hydraulic fluid.

1. Place the front bearing cup in the main housing.

2. Lubricate and carefully install two new O-ring seals and Teflon® seal into the servo piston. Install the black sealing ring first, then the yellow Teflon seal. Be careful not to twist or kink the seals.

6. Assemble a sliding block and centering bar pin.

7. Thread the sliding block and centering bar pin into the housing. Tighten to 28±2 ft-lbs

3. Work the new seals into place by inserting each end of the piston into the cylinder until the seals conform to the seal grooves.

8. Lubricate and install the two clocking links.

4. The servo piston is asymmetrical. Before inserting it in the cylinder, make sure it is oriented correctly. The longer stop of the piston should be next to the side of the housing with a thicker wall. (See photograph.)

9. Lubricate and install the two bearing races in the pump housing.

5. Lubricate and install the servo piston in the pump housing. Using a square, center and align the piston within the housing. (See photograph.)

10. Install the roller bearings so that they fit over the clocking links. (See photograph.)



Piston

Thrust Plate

Plate

Retaining Strap

Retaining Cap Screw

Washer

Spacer

Bronze Side

Max. Clearance ( C ) .008

A – B = C

Faces Swashplate

Swashplate

Piston Shoe

Shoe Retainer

15. Position the swashplate on the support base. Lubricate the thrust plate and install it on the swashplate. Install the two spacers, strap, washers and retaining screws.

11. Before proceeding further, check the fixed clearance. The preset fixed clearance is the clearance between the piston shoe face and thrust plate. The formula for this clearance is: Dimension A minus Dimension B equals Dimension C. Dimension C must not exceed .008 inches.

Important:

Do not tighten the two retaining screws. The bronze side of the strap must face the swashplate.

12. Measure the height of the retaining strap spacer (dimension A) using a micrometer of dial vernier calipers.

16. Place the rotating group with the shoes facing up. Carefully install the swashplate on the rotating group. The retaining strap should engage the retaining plate.

13. Lubricate and reassemble the rotating group.

17. Holding the swashplate and the rotating group together, carefully install it back on the support base. Install the remaining two spacers, strap, washers and retaining screws. Tighten all four retaining cap screws to 20± 2 ft - lbs.

14. Measure the combined thickness of the piston shoes and retainer (dimension B). The difference between dimension A and dimension B is the fixed clearance (dimension C).

18. Lubricate the input drive shaft and install it in the combined sub-assembly of the rotating group and swashplate.

Note: The fixed clearance must not exceed .008 inches. If it does, the piston/shoe assemblies should be re-evaluated.

19. Lubricate the rear bearing cone, place it on the shaft, and press it onto the shaft using a hydraulic press. The bearing cone must be firmly seated against the machined shoulder of the pump shaft.

Note: The bearing cone may be heated for installation.


20. Apply a small amount of petroleum jelly to the back side of the slider block to hold it in position. Lubricate and install the slide block on the swashplate.

25. Insert the centering bar along the inside of the housing so that it fits on top of the sliding block and centering bar pin.

21. Reinstall the bearing puller on the rear bearing so it can be lifted.

26. To help align the centering pin sub-assembly, mark the top center edge of the base as shown. Then place a sliding block and new O-ring on the pin to complete the centering pin sub-assembly.

22. Carefully lift the entire sub-assembly and install it into the pump housing. Align the slider block with the notch in the servo piston, and the two notches in the swashplate with the two clocking links.

Important: The swashplate assembly must be fully seated on the swashplate bearings.

23. As you lower the sub-assembly, align the tip of the clocking link so that it fits in the slot of the swashplate.

24. Measure the depth of the rotating kit in the housing. The barrel of the rotating kit should be about 1/2-inch below the top edge of the housing. (See photograph.)

27. Carefully insert the centering pin sub-assembly along the inside of the housing, and push it through.

28. Slip a new lock washer and a jam nut on the threads of the centering pin sub-assembly on the outside of the housing. Do not tighten these yet.

29. Insert two large hold-down springs on top of the centering bar, one at each end.




30. Install the hold-down arm in the slot on the swashplate arm.

31. Slide a washer and spring onto the hold-down arm.

32. Install and tighten the spring compression plates [part number] to compress the hold-down springs and arm.

33. Set the swashplate to neutral. Place two parallel bars across the face of the pump housing, making sure the bars are resting firmly on the housing face.

Using a depth micrometer, measure the distance from the parallel bar to the face of the swashplate and note the dimension. Repeat this step on the other side.

35. Using a hex wrench to keep the centering pin sub-assembly from turning, use a box wrench to tighten the jam nut and lock washers to 68 ± 6.8 ft - lbs.

36. Lubricate and install new rear bearing shims in the end cover. Apply petroleum jelly to the rear bearing and press it in place. This will hold the bearing cup in place when you turn over the end cover.

37. Set hollow dowels in the alignment holes on the top surface of the housing, and press them in place.

38. Set a new gasket on the top surface of the housing, aligned with the hollow dowels.

39. Turn over the end cover. Using a hoist, set it in place on top of the housing. The hollow dowels and hold-down springs should fit neatly in the counterbores on the face of the end cover.

Note: As you adjust the end cover position, take care not to damage the gasket.

34. Using a hex wrench, adjust the centering pin sub-assembly to tilt the swashplate. Check the measurements again. Repeat until the two dimensions are neutral—within .0005 of each other.

40. Insert four cap screws through the end cover and into the housing. Using a 3/4-inch socket, tighten the screws to 97 ± 9.7 ft - lbs.



41. Install a magnetic-base indicator on the mounting flange, with the indicator gauge probe set on the input shaft.

42. Using tongue-and-groove pliers, grip the drive shaft as far down as possible and pry it upward to determine shaft end play. The reading must be between .002 and .007 inch. To adjust shaft end play, either add or remove shims under the bearing cup in the end cover. When the end play is correct, remove the magnetic-base indicator.

43. Apply petroleum jelly to the valve plate and place it in the end cover, with the metering notches facing out.

44. Install two dowel pins in the face of the cylinder barrel. Lubricate the bearing plate and install it on the cylinder barrel, with the bronze side facing up and aligned with the dowel pins.

45. Using a hoist, lift the end cover back onto the housing. Align the counterbores in the end cover with the hollow dowels and hold-down springs in the housing.

46. Using a torque wrench with a 3/4-inch socket, install the eight end cover retaining cap screws. Tighten to 97 ± 9.7 ft - lbs

47. One side of the kidney slots in the charge pump valve plate is wider than the other. Note the (A) and (B) stamped on the end cover, next to the high pressure ports. The position of the charge pump valve plate determines charge pump input rotation.

• For pumps with clockwise input rotation, install the charge pump valve plate so the wide side of the kidney slot is on the (A) side of the pump end cover.

• For pumps with counterclockwise input rotation, install the plate so that the wide side of the kidney slot is on the (B) side of the pump end cover.

Note: The example shown is for counter-clockwise rotation.

48. One side of the eccentric ring is wider than the other and that the wide side has an identification “dot.” The eccentric ring also determines charge pump input rotation.

• For pumps with clockwise input rotation, install the eccentric ring so the identification “dots” are aligned. The wide side of the eccentric ring is on the (B) side of the end cover.

• For pumps with counterclockwise input rotation, install the eccentric ring so the identification “dots” are not aligned. The wide side of the eccentric ring is on the (A) side of the end cover.

49. Lightly coat the charge pump drive key with petroleum jelly to help hold it in position during assembly. Install the drive key in its recess located in the charge pump coupling.

Install the gerotor star on the charge pump coupling by aligning it with the drive key.

Next, install the charge pump coupling subassembly and gerotor’s outer ring into the pump end cover.

Lightly coat the charge pump sealing ring with petroleum jelly and install it into the end cover.


60. Thread a filter in place. Tighten the filter using large tongue-and-groove pliers.


50. Note the small and large recess cast into the charge pump cover subassembly. The large recess side of the charge pump cover must face toward the charge pump inlet.

55. Align the control sub-assembly with the main housing and fasten it with six bolts, using a 1/4-inch hex wrench. Tighten to 22 ± 2.2 ft - lbs.

51. Install the charge pump cover over the coupling and into the pump end cover, aligning the large recess in the cover sub-assembly with the charge pump inlet. Using a 1/4-inch hex wrench or bit socket, install the four retaining cap screws. Tighten to 22 ± 2.2 ft - lbs.

56. Using a 3/8-inch hex wrench or bit socket, thread the O-ring plug into the housing. Tighten to 68 ± 6.8 ft - lbs.

52. Apply a new O-ring to one servo piston cover, and two O-rings in the housing where the piston cover will go. Using a 1/4-inch hex wrench or bit socket, install the four retaining cap screws in the servo piston cover. Repeat these steps on the other side. Tighten to 22 ± 2.2 ft - lbs.

57. Using a 1-3/8-inch socket or closed-end wrench, install the low pressure relief valve (LPRV). Tighten to 105 ± 40 ft - lbs.

53. Insert the feedback link through the housing and thread it into the swashplate. Tighten to 39 ± 3.9 ft - lbs.

58. Using a 1-3/8-inch socket or closed-end wrench, install an IVS valve on each side. Tighten to 20 ± 25 ft - lbs.

54. Install a new gasket on the control sub-assembly.

59. Install a new O-ring and gasket on the filter head. Align the filter mounting base with the end cover and insert four bolts into the threads. Tighten to 22 ± 2.2 ft - lbs.



61. Install the seal into the pump housing, protecting the shaft seal with a seal bullet (drwaing in tool section) or similar tool. Install the seal with the lip facing inward.

62. Drive the seal into the pump housing using a seal driver or similar tool. Drive the seal in just far enough to install the retaining ring.

Note: When severe wear in the seal area of the shaft is noted, you may want to add one or two spacer washers to relocate the seal. Do not use more than two spacers.

63. Using internal snap-ring pliers, install a retaining snap ring directly on top of the seal. Using a seal driver or similar tool, tap the retaining ring inward until it snaps firmly in its groove.

64. The Series 760 Pump is now ready for test and installation.


Low ClearanceBearing Puller

8.034± .001

2.500 ± .030

3.00 min

5.00

Ø 1.62±.01

6.00 Dia.

2.50

.072

.052.021.041

Ø 1.85±.01

.14±.01

Ø 2.76±.01 1.20±.05

.595±.005

.250±.01

.094

.125 R.

.375 Ø Dowel Pin (2) PlacesPress Fit First Half Light Slip Fit Opposite Half

Heat Treat: 45-55 RcMaterial: 4340 Steel

.325±.010

Ø 4.445±.015

3.50±.01

Special Tools

It is recommended that replacement shafts be purchased as an assembly with the bearing already pressed into place. In the event a bearing is replaced

in the field, it must be pressed into place to the following dimensions in order to prevent damage to the pump.

Material – Steel(All dimensions are given in inches.)

Material Heat Treatment – 45-55 Rc (All dimensions are given in inches.)

Main Shaft Bearing Stop Limit Tool


Ø 1.882 ±.003

30° 204.80

R .020

(Ø 1.840)

Ø 1.840±.005 Ø 1.792

20

6.10

5.10

7.006.38

Ø 2.490.25

.60 + .005 - .000.269

1.900 ±.005

.200 x 30°

Bullet

Driver

30°

A

Special Tools

Ensure the shaft sealing surface and housing seal bore are clean and free of all dirt and debris to avoid introducing any contaminants into unit.

1. Grease the inside sur-face of seal that contacts shaft.

2. Select correct bullet and driver. Bullet and drive shaft chamfer must align with each other leaving no gap between the bullet and shaft. Bullet should pilot on shaft diameter so bullet cannot shift side to side, allowing step between bullet and shaft seal diameter.

3. Press the new, greased shaft seal over a shaft bullet. Closed face of the

shaft seal faces the closed end of the bullet.

4. With the shaft seal on the bullet, insert bullet over drive shaft and into the seal pocket. Take care to ensure seal is properly aligned with housing bore as seal is pressed in to minimize chance of dam-aging seal.

5. Using the driver and a mallet, push the seal until the tool bottoms on the pilot of flange.

6. Remove the tool and insert the retaining ring

into the seal pocket. A spacer is required, when-ever there is a significant groove in the shaft from the seal. (A maximum of two spacers may be used before the shaft must be replaced), place it between the shaft seal and the retaining ring.

7. Using the tool and mallet, drive the seal, spacer(as required if using, and retaining ring in until the retaining ring snaps into place in the groove.

Shaft Seal Bullet/Driver

Shaft Seal Installation Tools & Instructions

Pump Housing

Driver Bullet Shaft

Eaton Hydraulics Business USA14615 Lone Oak RoadEden Prairie, MN 55344USATel: 952-937-9800Fax: 952-294-7722www.eaton.com/hydraulics

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© 2008 Eaton CorporationAll Rights ReservedPrinted in USADocument No. E-PUPI-TS007-ESeptember 2008

760 Repair Manual - Electrical and Industrial Power ...pub/@eaton/@hyd/...ing the hydraulic lines....

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Transcript of 760 Repair Manual - Electrical and Industrial Power ...pub/@eaton/@hyd/...ing the hydraulic lines....