Usage:
START BY:
a. tilt cab (90° position)
NOTE: Earlier model loaders utilize a U-tube and additional hoses along with an on-board hand pump to release brakes to tow the vehicle. Later model vehicles use a brake bleed valve and an external pump group. Photos reflect removal from earlier vehicles.
1. Remove the front guard from under the hydrostatic power control unit and the rear guard from under the engine. Weight of the front engine is approximately 78 kg (172 lb.). Weight of the rear guard is approximately: 943 - 66 kg (146 lb.), 953 - 75 kg (166 lb.).
2. Remove the drain plug, and install a 1 in. pipe nipple in the oil pan, and drain the oil out of the hydrostatic power control unit. Capacity is approximately: 943 - 26.5 liter (7 U.S. gal.), 953 - 57 liter (15 U.S. gal.).
3. Disconnect oil lines (1), and remove clip (2) that holds the oil lines to the transmission.
4. Disconnect the lower end of rod (3) from the lever on the underspeed override valve.
5. Disconnect oil line (5) from the front of the oil pan on the hydrostatic power control unit. Remove the bolt from bracket (4) that holds the oil line to the back of the fuel tank.
6. Disconnect wires (6) from the sending unit in the front of the oil pan on the hydrostatic power control unit. The sending unit is for transmission oil temperature.
7. Disconnect the lower high pressure oil lines (7) from the sides of the hydrostatic power control unit. Oil lines (7) are the lower oil lines to the track motor.
8. Disconnect case drain line (8) and oil cooler line (9) from the rear of the hydrostatic power control unit on the left side.
9. Disconnect oil cooler line (10), case drain line (11) and oil level gauge tube (12) from the rear of the hydrostatic power control unit on the right side.
NOTE: 943 machine will not have dipstick tube (12).
10. Disconnect the wires from switch (13) for the back-up alarm, and remove clips that hold wire harness (14) to the front and top of the hydrostatic power control unit. Move the wire harness clear of the hydrostatic power control unit.
11. Disconnect upper high pressure oil line (15) from the left side of the hydrostatic power control unit. Oil line (15) is the upper oil line to the left track motor.
12. Disconnect hydraulic control linkages (16) from levers (17), and remove bracket and levers as a unit.
13. Disconnect upper high pressure oil line (18) from the right side of the hydrostatic power control unit. Oil line (18) is the upper oil line to the right track motor.
14. Disconnect connector (19), remove clips (21), and move the wire harness clear of the hydrostatic power control unit.
15. Remove fill tube and oil level gauge assembly (20) from the hydrostatic power control unit.
16. Disconnect governor linkage (22) from the governor. Remove the bolts that hold bracket (23) to the flywheel housing, and move the bracket clear of the flywheel housing.
17. On a 953 machine remove bolt (24) from the platform supports on both sides of the machine.
18. Install tooling (B) on both sides of the flywheel housing. On a 953 machine, install the L1774 Centering Spacers (25) under the screw in tooling (A) as shown. On a 943 machine, the screw in tooling (A) will push directly against the head of the bolt in the platform support. Tooling (A) is used to hold the weight of the rear of the engine when the hydrostatic power control unit is removed.
19. Remove bolts (26) from both sides of the hydrostatic power control unit. Tighten the forcing screws in tooling (A) until tooling (A) holds the weight of the hydrostatic power control unit and rear of the engine.
20. Fasten tooling (B), chains and a hoist to the hydrostatic power control unit.
21. Remove bolts (27) that hold the hydrostatic power control unit to the flywheel housing. Slide the hydrostatic power control unit away from the machine, and remove from the machine. Weight is: 943 - 612 kg (1350 lb.), 953 - 794 kg (1750 lb.).
Install Hydrostatic Power Control Unit
1. Be sure O-ring seal (1) is in position on the flexible coupling. Be sure lower mounts (3) are in position on both sides of the frame.
2. Fasten tooling (A), chains and a hoist to the hydrostatic power control unit. Put the hydrostatic power control unit in position in the machine, and slide into position on the flywheel housing with the splines on the flexible coupling in alignment with the splines in the drive gear in pump drive housing (2). Weight of the hydrostatic power control unit is: 943 - 612 kg (1350 lb.), 953 - 794 kg (1750 lb.).
3. Install the bolts that hold the hydrostatic power control unit to the flywheel housing.
4. Loosen the forcing screws in tooling (B) until the weight of the hydrostatic power control unit and rear of the engine is on the mounts. Remove tooling (B) from both sides of the flywheel housing.
5. Install the sleeve, upper mount, washer and bolt (4) on both sides of the hydrostatic power control unit. On a 953, install the bolts in hole (5) on both sides of the platform support.
6. Use tooling (C) and a torque wrench to tighten bolts (4) and, on a 953, the bolts in the platform support to a torque of 875 ± 100 N·m (640 ± 75 lb.ft.).
7. Put the wire harness in position on the hydrostatic power control unit, and install clips (6) to hold it in place.
8. Put fill tube and oil level gauge assembly (7) in position on the hydrostatic power control unit, and install the bolts and clip that hold it in place.
9. Connect high pressure oil line (8) to the right side of the hydrostatic power control unit. Oil line (8) is the upper oil line to the right track motor. Do not tighten the bolts at this time.
10. Install bracket (9) on the frame. Connect the hydraulic control linkages to the levers on bracket (9).
11. Install bracket (10) on the flywheel housing. Connect rod end (11) to the governor.
12. Connect the upper high pressure oil line (13) to the left side of the hydrostatic power control unit. Oil line (13) is the upper oil line to the left track motor. Put the upper high pressure oil lines on both sides of the hydrostatic power control unit at a 15° angle below horizontal, and tighten the bolts to a torque of 100 ± 15 N·m (75 ± 10 lb.ft.).
| NOTICE |
|---|
It is very important that the bolts that hold the high pressure oil lines to the hydrostatic power control unit are tightened to the correct torque. A failure of the seals on the oil lines will be the result if the bolts are not tightened correctly. |
13. Put the wire harness in position on the front and top of the hydrostatic power control unit, and install the clips that hold it in place. Connect the wires to switch (12) for the back-up alarm.
14. Connect rod (15) to the lever on the underspeed override valve. See Testing And Adjusting for correct adjustment procedure after the cab is lowered.
15. Connect oil line (14) as shown. Oil line (14) is the oil pressure supply line to automatically release the track brakes.
16. Connect wires (16) to the sending unit in the front of the oil pan on the hydrostatic power control unit. The sending unit is for transmission oil temperature.
17. Connect the lower high pressure oil lines (17) to both sides of the hydrostatic power control unit. Put the oil lines at a 15° angle below horizontal, and tighten the bolts to a torque of 100 ± 15 N·m (75 ± 10 lb.ft.).
| NOTICE |
|---|
It is very important that the bolts that hold the high pressure oil lines to the hydrostatic power control unit are tightened to the correct torque. A failure of the seals on the oil lines will be the result if the bolts are not tightened correctly. |
18. Connect case drain line (18) for the right track motor to the left side of the hydrostatic power control unit as shown.
19. Connect oil cooler line (19) to the rear of the hydrostatic power control unit on the left side.
20. Connect oil cooler line (20) and case drain line (21) for the left track motor to the rear of the hydrostatic power control unit on the right side as shown.
21. On 953 machines connect tube (22) for the oil level gauge to the hydrostatic power control unit.
22. Connect the heater hoses to tubes (23) on the cab heater. Open the water valves in the heater hoses at the engine.
23. Install clamp (24) to hold the refrigerant lines and heater hoses to the bottom of the cab platform.
24. Install bar (25) in the tube assembly on the cab, and install rod end (26) on the bracket. Connect the governor linkage to lever (27) on the bar.
25. Connect oil line (28) as shown. Oil line (28) is from the hand pump used to manually release the track brakes. Install clip (29) on the oil lines.
26. Connect oil line (30) to the front of the oil pan on the hydraulic power control unit. Oil line (30) is the supply line to the hand pump used to manually release the track brakes.
27. Connect wire harness on the right side of the cab.
28. Fill the transmission to the correct level with oil. Use the following procedure if the transmission is new, rebuilt or has been in storage for more than 90 days.
a. Fill the transmission filter housing.
b. Fill the transmission until it is 220 mm (8.7 in.) above the full mark.
c. Turn the transmission with the engine starter for three 5-second intervals.
d. Start the engine two times at low idle, and stop it when the charge pressure gets to 400 kPa (58 psi).
e. Drain the transmission until the oil level is 100 mm (4 in.) above the full mark. After normal start up procedures, with engine at low idle and oil warm, adjust oil level to full mark.
29. Install the front guard under the hydrostatic power control unit and the rear guard under the engine. Weight of the front guard is approximately 78 kg (172 lb.). Weight of the rear guard is approximately: 943 - 66 kg (146 lb.), 953 - 75 kg (166 lb.).
30. Remove air from brakes. *
END BY:
a. lower cab (90° position)
*For the procedure to remove air from the brakes see Testing And Adjusting.