Usage:
Start By:
a. remove charge pump
NOTE: Identify all hydraulic lines as they are removed for reinstallation purposes. Cap and plug all lines and fittings to prevent contaminants from entering the system.
1. Remove switch (1), hydraulic lines (2) and propel cable (3).
2. Remove four bolts (4).
3. Attach hoist and remove the pump. The weight of the pump is 64 kg (140 lb).
NOTE: For installation of the propel pump, reverse the removal steps.
End By:
a. install charge pump
Remove And Install Servo Control Valve
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At operating temperature, the hydraulic tank is hot and under pressure. Hot oil can cause burns. Remove the fill plug only when the engine is stopped, and when the fill plug is cool enough to touch with your bare hand. |
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1. Release the pressure in the hydraulic oil tank by slowly loosening the pressure cap located on top of the tank.
2. Drain the hydraulic tank. The capacity of the tank is 132 liters (35 U.S. gal).
3. Remove nut (1) and eight bolts (2). Swing the valve away from the pump.
4. Lift the valve off the linkage and remove the valve.
NOTE: For installation of the servo control valve, reverse the removal steps.
Disassemble And Assemble Servo Control Valve
Start By:
a. remove servo control valve
1. Remove switch (1).
2. Remove locknut (2), pin (3) and washer (4).
3. Remove control arm (5).
4. Remove bushing (6).
5. Remove control arm assembly (7) and cover (18).
6. Remove retaining ring (12) and slide actuator (8), spring (9) and sleeve (10) from shaft (13).
7. Remove retaining ring (16). Remove stop (14) from link (15). Remove O-ring (11) from shaft (13).
8. Remove spool assembly (19).
9. Remove seal (20).
10. Remove nut (21).
11. Remove screw (23). Remove the seal from screw (23).
12. Remove spool (24) from the housing.
13. Remove the ring that holds washer (25) and spring (26) on the end of spool (24).
14. Remove washer (25), spring (26), the sleeve and washer from spool (24).
15. Remove both plugs (27).
16. Check the O-ring seals on plugs (27) and inspect seals (28) for damage.
NOTE: For reassembly of servo control valve, reverse the disassembly steps.
End By:
a. install servo control valve
Disassemble Propel Pump And Motors
Start By:
a. remove propel pump or motor
| NOTICE |
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Dirt can damage precision made parts of the pump. Disassemble the pump on a clean work surface, clean all the parts separately in clean solvent and let the parts dry at room temperature. Check the condition of all parts and refer to Guideline For Reusable Parts, Piston Pumps And Motors, Form No. SEBF8032-01 as a guide for reconditioning and determining the reusability of parts. |
Propel Pump
Propel Motor
1. Remove servo valve (1) or plate (1) and end cap (2).
2. Remove bearing plate (3).
3. Remove pilot bearing (41) from the bearing plate.
4. Remove the bearing with tooling (A).
5. Remove cylinder block (4).
6. Place the cylinder block down on a clean surface. Remove retainer (5) with pistons (6), then remove guide (8) from the cylinder block.
7. Remove springs (7).
8. Use tooling (B) and a press to put the spring in the cylinder block in compression. Remove spiral ring (11).
9. Remove retainer (10), spring (9) and seat (12) from the cylinder block.
10. Remove the retainers that hold the servo cylinders (13) in position.
NOTE: Mark the position of the servo cylinders and count the number of turns as they are removed.
11. Remove servo cylinders (13) with tool (C).
12. Remove cover (15) and shaft (14).
13. Remove O-ring (17) and seal (18).
14. Use tooling (A) to remove bearing cone (16).
15. Remove bearing cup (19).
16. Remove retaining ring (20).
17. Remove retainer (25), O-ring (24), six springs (26), dowel (23), O-ring (22), and seal (21).
18. Using tooling (E), remove both trunnions (27).
19. Remove gaskets (28) (shims) from the left trunnion.
20. Remove bearing (29) and seal (30) from each trunnion (27).
21. Remove thrust plate (31) from the swashplate.
22. Remove swashplate (32).
23. Remove the ring from pin (36) with tool (F), remove pin (36) from the swashplate with a soft punch or hydraulic press.
| NOTICE |
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Put a spacer (33) between the swashplate ears and the links to prevent any distortion of the ears. |
24. Remove ring (34) with tool (F). Remove the pin from servo piston (35) and the link.
25. Repeat Steps 23 and 24 for the other servo piston assembly.
26. Remove the rings and pin for the follow-up link that connects to the servo control valve linkage.
27. Remove bearing cups (37) from both sides of the swashplate.
28. Remove the screw and washer from servo piston (40). Remove guide (38) and spring (39) from the piston.
Assemble Propel Pump And Motors
Start By:
a. Make an inspection of the pump shaft, cylinder block, pistons, servo sleeves and servo pistons. Use Piston Pumps And Motors, Form No. SEBF8032-01, as a guide for reusable parts.
NOTE: Lightly coat all parts as they are assembled with clean hydraulic fluid.
1. Put guide (38) in spring (39) and the spring in piston (40). Install the washer and screw that hold the component parts in position.
2. Use tooling (A) to install both bearing cups (37) in the swashplate.
3. Put servo piston (35) in position on the link and install pin (34). Use tool (B) to install the retaining rings on pin (34).
4. Put the link and servo piston in position on the swashplate. Align the hole in the link with the hole in the swashplate ear. Install pin (36) with a hydraulic press.
| NOTICE |
|---|
Put a spacer between the swashplate ears and the link to prevent distortion to the ears while the pin is pressed. Pin (36) must be pressed, if it is driven, the hole in the swashplate may become distorted. |
5. Install the retaining rings on pin (36) with tool (B).
6. Install the follow-up link on the swashplate with the pin and retaining ring on each end of the pin.
7. Install swashplate (32) in the case. Make sure the follow-up link is through the opening so it can make connection with the servo control valve linkage.
8. Install thrust washer (31) on the swashplate with the chamfered edge facing down.
9. Install bearing cone (29) on each of the trunnions.
10. Put a thin layer of petroleum jelly on the trunnion O-ring seals. Install the O-ring seal only on the right trunnion.
11. Install both trunnions in the pump case. The left trunnion must be installed without the O-ring seal and lockwashers.
12. Tighten the bolts that hold the right trunnion to a torque of 55 +7 -0 N·m (40 +5 - 0 lb ft). Tighten the bolts that hold the left trunnion to a torque of 11.3 N·m (100 lb in).
NOTE: Make sure the follow-up link is still in the opening for the servo control valve linkage.
13. Use a feeler gauge to check the clearance between the left trunnion and the case. Take this measurement near each bolt. Write down the average measurement between the three bolts.
14. Remove the left trunnion. Install the O-ring seal on the trunnion.
15. Install enough gaskets (shims) (28) to equal the average measurement plus 0.36 mm (.014 in).
16. Install the left trunnion, the lockwashers and the bolts. Tighten the bolts to a torque of 55 +7 -0 N·m (40 +5 -0 lb ft).
17. Install the seals on the servo cylinders.
18. Use tool (C) to install the servo cylinders according to the identification made at disassembly. Install the retainer that holds each servo cylinder in position.
19. Install bearing cup (19) in the cover.
20. Install bearing (16), O-ring (17) and seal (18) on the shaft. Put a light coat of petroleum jelly on the O-ring before the seal is installed.
21. Install dowel (23), six springs (26) and O-ring (24) in retainer (25).
22. Put a light coat of petroleum jelly on O-ring (22) and install O-ring (22) on seal (21). Install the O-ring and the seal in retainer (25).
23. Install the retainer and seal assembly in the cover.
24. Install retaining ring (20).
25. Install shaft (14) in cover (15). Install the shaft and cover on the pump case and install the bolts in the cover.
26. Put seat (12), spring (9) and retainer (10) in position in the pump cylinder block.
27. Use tooling (D) and a press to put spring (9) in compression in the cylinder block. Install spiral ring (11) as shown.
28. Install springs (7). Install guide (8) on springs (7) with the wide tooth of guide in alignment with the wide tooth (X) of the cylinder block.
29. Install pistons (6) in retainer (5) and slide the pistons into the bores of the cylinder block.
30. Slide cylinder block (4) onto the pump shaft. Heat the bearing cone to a maximum temperature of 135°C (275°F) and install the bearing cone on the shaft.
31. Install pilot bearing (41) on bearing plate (3).
32. Align the slot in bearing plate (3) with the pin in the cylinder block and install the bearing plate.
Propel Pump
Propel Motor
33. Install end cap (2) and servo valve or cover (1).
End By:
a. install propel pump or motor.