422F, 428F, 432F, 434F and 444F Backhoe Loaders Machine Systems Caterpillar

Assembly Procedure

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Illustration 1	g06141995

1. Install shaft seal (43) and retaining ring (42) into main drive pump housing (6).
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   Illustration 2	g06141984

2. Use the proper equipment to handle the bearing cup. Lower the temperature of bearing cup (41). Install bearing cup (41).

3. Install bearings (40) and screws (39). Tighten screws (40) to a torque of 5 ± 1 N·m (44 ± 8 lb in).
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   Illustration 3	g06142051

4. Use the proper equipment to handle bearing cone (38). Raise the temperature of bearing cone (38) to a maximum of 121 °C (250 °F). Install bearing cone (38) onto the shaft assembly (36).
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   Illustration 4	g06141943

5. Install shaft assembly (36) and spring (37).

6. Use the following steps to determine the proper preload on the bearings of the pump assembly.
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   Illustration 5	g06143192

   1. Use the proper equipment to handle the bearing cup. Lower the temperature of bearing cup (30) and install the bearing cup in head assembly (26).
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      Illustration 6	g06143201

   2. Install bearing cone (31) onto shaft assembly (36).

      Assemble the pump without shim (10) to check the preload of bearing cone (7).

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      Illustration 7	g06143218

   3. Position the head assembly onto the main drive pump housing. Install bolts (25).Tighten bolts (25) to a torque of 205 ± 10 N·m (151 ± 7 lb ft).
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      Illustration 8	g06143597

   4. Set bearing preload before you install the rotating group. The bearing preload should be 0.00 to 0.05 mm (0.000 to 0.002 inch) .

   5. Install Tooling (E) into shaft assembly (36). Install Tooling (D) onto the pump housing. Use Tooling (D) to determine the end play of shaft (36). Be sure that you move shaft (36) completely in both directions. Use appropriate tools to move shaft (36).

   6. If necessary, grind the adjustment shim to obtain the correct dimension between the head assembly and the main drive pump housing. If necessary, replace the shim with a new part.

   7. The thickness of the shim should equal the end play measurement plus 0.0508 mm (0.00200 inch). For example, if the end play is 2.1590 mm (0.08500 inch) then the shim thickness should be 2.2098 mm (0.08700 inch).

   8. Record the measurement.

   9. If necessary, grind the shim to the determined measurement.

   10. Remove the head assembly from the main drive pump housing. Remove the bearing cone and the adjustment shim from the shaft assembly.

   11. Proceed with the assembly of the main hydraulic pump.
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   Illustration 9	g06143452

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   Illustration 10	g06141940

   Note: It is necessary to compress spring (37) through hole in pump housing (6) to install swashplate (35).Ensure that spring (37) is installed correctly onto swashplate (35) before continuing the assembly.

7. Install swashplate (35) into main drive pump housing (6).
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   Illustration 11	g06143325

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   Illustration 12	g06141820

8. Install rotary group (34), shim (33) that was determined in Step 6, and O-ring seals (32).

9. Install bearing cone (31) into main pump housing (6).
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   Illustration 13	g06143333

10. Apply Tooling (F) to the back of port plate (31) and install onto head assembly (26).

11. Install O-ring seal (29) onto head assembly (26).
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    Illustration 14	g06141800

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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

12. Install head assembly (26) and bolts (25). Tighten bolts (25) to a torque of 205 ± 10 N·m (151 ± 7 lb ft).

13. Install adjustment screw (28) and the O-ring seal. Install cover (27) and the O-ring seal.
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    Illustration 15	g06141787

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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

14. Install spool (19), guide (20), spring (21), spring (22), O-ring seal (23), and plug (24) into compensator valve (1).

15. Install spool (13), guide (14), spring (15), spring (16), O-ring seal (17), and plug (18) into compensator valve (1).

16. Install gasket (12) onto compensator valve (1).
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    Illustration 16	g06141600

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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

17. Install O-ring seals (11) onto valve group (4). Install spool (10), spring (9), guide (8), and actuator piston (7) onto valve (4).
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    Illustration 17	g06141568

18. Install valve (4) and the O-ring seal into main drive pump housing (6). Install solenoid (3), nut (2), and the O-ring seal onto valve (4).

19. Install compensator valve (1) and bolts (5) onto main drive pump housing (6). Tighten bolts (5) to a torque of 15 ± 2 N·m (132 ± 17 lb in).

End By:

1. Remove from Tooling (A).

2. Install the piston pump (main hydraulic).