345C Excavator and 345C MHPU Mobile Hydraulic Power Unit Machine Systems Caterpillar

Assembly Procedure

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Illustration 1	g01179314

1. Lower the temperature of bearing cone (46) .

2. Install bearing cone (46) .

3. Install lip seal (45) .

4. Use Tooling (D) in order to install retaining ring (44) .

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Illustration 2	g01179402

5. Raise the temperature of bearing cone (43) and install bearing cone (43) onto shaft (42) .

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Illustration 3	g01179109

6. Install bearings (41) and shaft (42) .
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   Illustration 4	g01179406

   1. Install shim (30) and bearing cone (29) .
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   Illustration 5	g01179408

   2. Lower the temperature of bearing cup (24) and install the bearing cup in head assembly (21) .
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   Illustration 6	g01179410

   3. Position head assembly (21) onto the pump housing.

   4. Use Tooling (A) in order to measure the distance between the head assembly and the pump housing.

   5. Take measurements at three equal intervals on the surface between the head assembly and the pump housing.

   6. The average of the three dimensions is zero to 0.050 mm (0.0020 inch).

   7. Shim (30) must be replaced or ground to this dimension.
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   Illustration 7	g01179411

   8. Install bolts (20) in head assembly (21). Tighten bolts (20) to a torque of 55 ± 10 N·m (41 ± 7 lb ft).
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   Illustration 8	g01179412

   9. Use Tooling (F), Tooling (G), and a screwdriver in order to check for end play in shaft (42). If end play exists in the shaft assembly, repeat Step 6.a until the correct dimension is reached.

   10. Remove bolts (20) and head assembly (21) .

   11. Remove bearing cone (29) and shim (30) from shaft (42) .

   12. Proceed with the assembly of the pump housing assembly.

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Illustration 9	g01179107

7. Install swashplate (40) .

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Illustration 10	g01179105

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Illustration 11	g01179106

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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.

8. Install pins (37), washer (38), and spring (39) .

9. Use Tooling (A), Tooling (C), and a suitable press in order to install retaining ring (36) into barrel (35) .

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Illustration 12	g01179104

10. Install bearing (34) .

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Illustration 13	g01179103

11. Install pistons (32) and retaining plate (33) .

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Illustration 14	g01179102

12. Install shim (30) and rotating assembly (31) .

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Illustration 15	g01179101

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

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Illustration 16	g01179100

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

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Illustration 17	g01179441

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

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Illustration 18	g01179098

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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.

16. Install bolts (20) and head assembly (21) .

17. Tighten bolts (20) to a torque of 55 ± 10 N·m (41 ± 7 lb ft).

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Illustration 19	g01179111

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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.

18. Install retainers (9), spring (10), spool (11), backup ring (12), adapter (13), and cartridge assembly (14) .

19. Install backup ring (7), O-ring seal (8), and valve (6) .

20. Install spool (15), retainer (16), spring (17), spring (18), and valve (19) .

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Illustration 20	g01179112

21. Install O-ring seals (3), coil (4), and nut (5) .

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Illustration 21	g01179113

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

End By: Install the fan pump. Refer to Disassembly and Assembly, "Fan Pump - Install".