920 & 930 WHEEL LOADER VEHICLE SYSTEMS Caterpillar


Loader Main Frames

Usage:

Separation Of Loader Main Frames

1. Put blocks in front and behind the front tires.

2. Install a block (1) between the rear frame and axle housing on each side of the machine to prevent side movement of the rear frame.

------ WARNING! ------

Stop the engine, lower the bucket to the ground and move the control levers backward and forward to release the pressure in the hydraulic system. Slowly loosen the cap to release any pressure in the hydraulic tank. Let the hydraulic oil become cool before any lines are disconnected in the hydraulic system.

--------WARNING!------

3. Drain the oil from the hydraulic tank. The capacity of the system is:

920-17.5 U.S. gal. (66 litre)
930-19.5 U.S. gal. (74 litre)

4. Remove bolts (2) from each end of intermediate drive shaft (3) and remove the drive shaft.

5. Remove bolts (4) and the washers. From the top of the front frame remove the pins that hold the steering cylinder rods.

6. Disconnect the brake chamber rod end from the emergency and parking brake. See Remove Emergency and Parking Brake for this procedure.

------ WARNING! ------

Open the drain valve on the air tank and remove the air pressure from the system before any brake or air lines are disconnected.

--------WARNING!------

7. Disconnect brake line (5) from the front frame.

8. Remove floor plates (6).

9. Put identification on hydraulic hose assemblies (7), (8), (9) and (10) for correct installation. Disconnect the hose assemblies from the front frame.

10. Disconnect air line (12) from the horn valve and pull it to the front frame.

11. Put identification on oil lines (11) for correct installation. Disconnect oil lines (11) from the lift kickout and bucket positioner slave cylinders (the slave cylinders are found under the operators seat).

12. Install two of tooling (A) under the front frame for support.

13. Put a floor jack in position under the output transfer gear case.

14. Fasten a lift truck to the rear frame as shown.

15. Remove plate (13) and the shims from the bottom of the front frame.

16. Use one of tooling (A) to push the lower pivot pin out of the frames.

17. Use tooling (B) to remove spacer (14) as shown. The spacer must be removed before separation of the frames can be made.

18. Remove the bolt that holds wire assembly (16) and move the wire assembly from the upper pivot pin plate. Install the bolt in the pivot pin plate.

19. Remove the four bolts (15) that hold the pivot pin plate to the frame.

20. Install two 1/2"-13 NC forcing screws in pivot pin plate (17) and remove the upper pivot pin.

21. Use the lift truck and floor jack to pull the rear frame from the front frame.

22. Put blocks under the front of the rear frame for support. Remove the floor jack and lift truck from the rear frame.

Connection Of Loader Main Frames

1. Fasten a lift truck to the back of the rear frame.

2. Put a floor jack in position under the output transfer gear case. Remove the blocks used for support from under the front of the rear frame.

3. Make sure the blocks are in position in front and behind the front tires and the weight of the front frame is on tooling (A).

4. Push the rear frame into position on the front frame with the lift truck.

5. Make an alignment of the bores in the main frames and install upper pivot pin (1). Tighten the four bolts (in a sequence of two opposite corners at a time) that hold the upper pivot pin plate. After the pivot pin is in the correct position the bolts must be tightened to a torque of 50 ± 25 lb.ft. (70 ± 35 N·m). Bend the locks on the bolts.

6. Remove one of the center bolts from the upper pivot pin plate. Move the wire assembly and clip in position over the plate and install the bolt.

7. Install lower pivot pin (2) as shown.

8. Use tooling (B) to install spacer (3) for the lower pivot pin.

9. Put plate (4) in position on the machine and install two of the bolts that hold it 180° apart. Tighten the bolts to a torque of 15 lb.ft. (20 N·m).

10. Measure the distance between plate (4) and the frame (360° around the plate) with a feeler gauge. Make a note of the minimum measurement.

11. Remove plate (4) and install shims (5) that have a thickness of the minimum measurement taken in Step 10 minus .010 in. (.25 mm). Install the plate and tighten the seven bolts.

12. Connect oil lines (6) to the lift kickout and bucket positioner slave cylinders.

13. Connect air line (7) to the horn valve.

14. Connect hose assemblies (8), (9), (10) and (11) to their correct location on the front frame.

15. Connect brake line (12) to the front frame.

16. Put intermediate drive shaft (13) in position and install the bolts to hold it. Tighten the bolts to a torque of 45 ± 5 lb.ft. (60 ± 7 N·m) with hardened washers.

17. Put both steering cylinder rods (15) in position with washers (16) on each side of the rods to make the steering cylinders level. Install pin (14), the bolts and washers.

18. Install the two floor plates on the machine.

19. Remove the lift truck, tooling (A) and the blocks between the axle housing and rear frame.

20. Fill the hydraulic system with oil to the correct level.

21. Use tool (C) and remove (bleed) the air from the brake system. See HYDRAULIC BRAKE SYSTEM SERVICING in TESTING AND ADJUSTING.

22. Remove (bleed) the air from the lift kickout and bucket positioner systems. See REMOVE AND INSTALL LIFT KICKOUT MASTER CYLINDER for this procedure.

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