926M, 930M and 938M Wheel Loaders Machine Systems Caterpillar

Assembly Procedure

Note: Apply a light film of 10W oil to all components before assembly.

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Illustration 1	g02726753

1. Install retaining ring (46) to pump housing (44) .

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Illustration 2	g02726756

2. Use Tooling (A) in order to install lip seal (48) to the pump housing. The sealing lip of the lip seal should face toward the bearing cup. The lip seal must seat against the retaining ring.

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Illustration 3	g02726758

3. Lower the temperature of bearing cup (47). Use Tooling (A) in order to install bearing cup (47) to pump housing (44). Install bearing cup (47) until the bearing cup seats.

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Illustration 4	g02726748

4. Install brass bearings (45) into pump housing (44) .

5. Use the following steps to determine the preload on the bearings of the pump assembly.
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   Illustration 5	g02726761

   1. Lower the temperature of shaft (35). Use a suitable press in order to install shaft (35) into bearing cone (32). Install shaft (35) until bearing cone (32) is seated onto shaft (35) .
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   Illustration 6	g02726763

   2. Install shaft (35) into pump housing (31) .
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   Illustration 7	g01306945

   3. Install shim (30) and bearing cone (29) on shaft (35) .
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   Illustration 8	g01306947

   4. Lower the temperature of bearing cup (24). Use Tooling (A) and a suitable press in order to install bearing cup (24) in pump head (21). Install the bearing cup until the cup is seated.
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   Illustration 9	g01305012

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   Illustration 10	g02726655

   5. Position pump head (21). Install bolts (20) but do not tighten bolts (20) at this time.

   6. Use a feeler gauge to measure the distance between the pump head and the pump housing. Take measurements at three equal locations on the surface between the pump head and the pump housing.

   7. The average of the three dimension should be zero to 0.050 mm (0.0020 inch).

   8. If the dimension is not correct remove shim (30). Refer to Illustration 7. To achieve the correct dimension, grind the shim or replace shim (30) .

   9. When the correct dimension is achieved, tighten bolts (20) and then invert the pump assembly.

   10. Use Tooling (C), a suitable screwdriver, and a set of slip joint pliers to check the end play on shaft (35). If end play exists on the shaft, repeat Step 5 until the correct dimension is reached.

   11. Remove bolts (20) and pump head (21). Remove bearing cone (29) and shim (30) from shaft (35). Remove shaft (35) .

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Illustration 11	g02726764

6. Install pins (40) into barrel (38) .

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Illustration 12	g02726724

7. Install seat (43) in order to secure pins (40) in barrel (38) .

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Illustration 13	g02726722

8. Position barrel (38) in a suitable press. Install spring (42) in barrel (38). Position retaining ring (41) on top of the spring.

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Illustration 14	g02726619

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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.

9. Position Tooling (A) and the suitable press on top of the spring and inside of retaining ring (41). Use Tooling (A) in order to depress the spring that is in barrel (38). Install retaining ring (41) that secures the spring in barrel (38). Remove Tooling (A) .

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Illustration 15	g02726721

10. Install collar bearing (39) to pins (40) and barrel (38) .

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Illustration 16	g02726717

11. Install pistons (37) to the original positions in retraction plate (36). Install pistons (37) and retraction plate (36) to barrel (38). Pistons (38) must be installed to the original positions.

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Illustration 17	g01305021

12. Position swashplate (33) to rotating group (34) .

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Illustration 18	g01305019

13. Raise the temperature of bearing cone (32) .

14. Install bearing cone (32) onto shaft (35) .

15. Install shaft (35) and bearing cone (32) into swashplate (33) and rotating group (34) .

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Illustration 19	g01305018

16. Install pump housing (31) onto bearing cone (32), swashplate (33), and rotating group (34). Turn the pump housing over 180 degrees and hold the components in the pump housing.

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Illustration 20	g01305016

17. Install shim (30) .

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Illustration 21	g01305015

18. Install piston (28) and bearing cone (29) .

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Illustration 22	g01305014

19. Install O-ring seal (25), spring (26), and piston (27) .

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Illustration 23	g01306958

20. Install O-ring seals (22) and port plate (23) .

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Illustration 24	g01305012

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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.

21. Install pump head (21) and bolts (20) .

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Illustration 25	g01305011

22. Install spool (18) and spool (19) .

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Illustration 26	g01305010

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Personal injury can result from being struck by parts propelled by a released spring force. Make sure to wear all necessary protective equipment. Follow the recommended procedure and use all recommended tooling to release the spring force.

23. Install screw (16), retainer (17), spring (15), spring (14), O-ring seal (13), housing (12), nut (11), and adjustment screw (10) .

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Illustration 27	g01305007

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Personal injury can result from being struck by parts propelled by a released spring force. Make sure to wear all necessary protective equipment. Follow the recommended procedure and use all recommended tooling to release the spring force.

24. Install retainer (9), spring (8), spring (7), O-ring seal (6), housing (5), and adjustment screw (4) .

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Illustration 28	g01305006

25. Install gasket (3) .

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Illustration 29	g01305005

26. Install valve (2) and bolts (1) .

End By: Install the implement piston pump.