140M and 150 Motor Grader Piston Pump (Hydraulic Fan) - Assemble Caterpillar


Piston Pump (Hydraulic Fan) - Assemble
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1.1. Assembly Procedure

Assembly Procedure

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
1P-0510  Driver Gp 
1P-1854  Retaining Ring Pliers 
1P-1853  Retaining Ring Pliers 
8T-5096  Dial Indicator Group 

Note: Cleanliness is an important factor. Before assembly, thoroughly clean all parts in cleaning fluid. Allow the parts to air dry. Do not use wiping cloths or rags to dry parts. Lint may be deposited on the parts which may cause trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement. Dirt and other contaminants can damage the precision component. Perform assembly procedures on a clean work surface. Keep components covered and protected at all times.

    Note: Before you reassemble the pump, replace all parts, assemblies, seals, and O-ring seals that are worn or damaged. Lubricate the seals and O-ring seals with petroleum jelly in order to retain the seals and O-ring seals during reassembly. This will also provide lubrication to the dust seals and to the shaft seals.



    Illustration 1g00711061


    Illustration 2g01413287

  1. Use Tooling (A) in order to install seal (47) in housing (3). Install seal (47) until seal (47) is just below the face of housing (3). Do not seat seal (47) at this time.

  2. Use Tooling (C) in order to install retaining ring (46) on top of seal (47).

  3. Use Tooling (A) and a suitable press in order to press retaining ring (46) and seal (47) into housing (3). Press retaining ring (46) and seal (47) until retaining ring (46) is installed in the groove in housing (3).


    Illustration 3g01413218

  4. Install bearing cup (45) (not shown). Install shaft (24) in housing (3). Bearing (44) must be properly seated.


    Illustration 4g01413206

  5. Install bearings (43) and spring (42).


    Illustration 5g00885504


    Illustration 6g00885503

    Note: Caution must be used when you install swashplate (39). Do not dislodge the spring or the bearings.

  6. Install swashplate (39) in housing (3). Check the condition of socket (41).

  7. Install piston rod (40) in the bore and engage piston rod (40) in socket (41).


    Illustration 7g00885502

  8. Install piston (38) in the boreon housing (3).


    Illustration 8g01413196

  9. Install plug (37) and the O-ring seal into housing (3). Tighten plug (37) to a torque of 190 N·m (140 lb ft).


    Illustration 9g00885500


    Illustration 10g00885583


    Illustration 11g01413191

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

    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.


  10. Install pressure pins (36), retaining disc (35), and spring (34) in barrel (31).

  11. Install retaining ring (33) on top of spring (34). Use Tooling (A) and a suitable press in order to compress spring (34). Compress until retaining ring (33) can be installed in the groove in barrel (31) with Tooling (B).


    Illustration 12g00885498


    Illustration 13g00885497

  12. Install retaining ball (32) on barrel (31) and install retaining plate (29) with pistons (30) in barrel (31).

    Note: 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).



    Illustration 14g00885593

  13. Do not install shim (27). Install bearing cone (26) onto shaft (24). Assemble the pump without shim (27) in order to check the preload of bearing cone (26).


    Illustration 15g01413459

  14. Install bearing cup (26A) to port block (21). Install O-ring seal (22) and plate (23) to the port block (21).


    Illustration 16g01413172

  15. Install the port block (21) on housing (3). Install allen head screws (20).


    Illustration 17g00885594


    Illustration 18g00885595

  16. Install Tooling (D) onto housing (3). Use the dial indicator to determine the end play of shaft (24). Be sure that you move shaft (24) completely in both directions. Use appropriate tools in order to move shaft (24).

  17. The thickness of shim (27) 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).

  18. Record the Measurement.

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


    Illustration 19g01413172

  20. Remove allen head screws (20), port block (21), and the bearing cone.


    Illustration 20g00885693

    Note: All parts must be in the proper position.

  21. Wrap pistons (30) with string but do not tie the string. Hold the string tight and carefully install rotating group (28) in housing (3). The splines on shaft (24) must engage with splines in retaining ball (32).


    Illustration 21g01413318

  22. Install shim (27).


    Illustration 22g00885494

  23. Install bearing cone (26) onto shaft (24). Install O-ring seals (25).


    Illustration 23g01413172

  24. Install port block (21) onto housing (3).

  25. Install allen head screws (20).


    Illustration 24g00885466


    Illustration 25g00872434

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

    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.


  26. Install spool (18) to body (19). Install spring retainer (17). Install spring (15) and spring (16). Install seat (14) to plug (5). Install O-ring seal (13) to plug (5).

  27. Install spool (12) to body (19). Install spring retainer (11). Install spring (9) and spring (10). Install seat (8) to plug (4). Install O-ring seal (7) to plug (4).


    Illustration 26g01413161

  28. Install the O-ring seal and plug (6) to compensator valve (2). Install plug (4) and plug (5) to compensator valve (2).


    Illustration 27g01413155

  29. Position the compensator valve (2) on housing (3). Install allen head screws (1). Tighten allen head screws (1) to a torque of 12 N·m (106 lb in).

End By:

  1. Install the pump. Refer to Disassembly and Assembly, "Piston Pump (Hydraulic Fan) - Install".

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