938G Wheel Loader and IT38G Integrated Toolcarrier Machine Systems Caterpillar

Assembly Procedure

Note: Make sure that all parts of the steering metering pump are clean prior to assembly. During assembly, apply clean SAE 10W oil on the internal parts of the steering metering pump.

1. Check the condition of all O-ring seals. If any seal is worn, use a new part for replacement.

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Illustration 1	g00278659

2. Install O-ring seals (23) and (25) on seat (24). Install retainer (27), ball (26), seat (24) and plug (22) in the pump body. The torque for plug (22) is 11.3 N·m (100 lb in).

   Note: Make sure that the plug is flush with the surface of the pump body.

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Illustration 2	g00278658

3. Install seals (20) in bushing (21) .

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Illustration 3	g00278657

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Illustration 4	g00278616

4. Install O-ring seal (19) in the pump body. Install bushing (18) and spiral lockring (17) .

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Illustration 5	g00278615

5. Turn the pump body onto the opposite side. Install bearing races (15) and bearing (16) in the pump body.

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Illustration 6	g00279553

6. Use the following procedure to assemble the sleeve assembly:

   1. Install six springs (13) in spool (12). There must be three springs on each side. Make sure that the curves of the springs are in contact and in the center of the spool. The notched side of the spring ends must face toward the sleeve.

   2. Install sleeve (11) over spool (12). The notch in the sleeve must engage with the ends of spring (13) .

   3. Install pin (14) .

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Illustration 7	g00279555

7. Install sleeve assembly (10) in the pump body.

8. Install O-ring seal (9) in the pump body.

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Illustration 8	g00279557

9. Install spacer (8) and drive (7) in the pump body. Make sure that the notch in drive (7) engages with pin (14) in the sleeve assembly.

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Illustration 9	g00278609

10. Install O-ring seal (6) in gerotor assembly (4) .

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Illustration 10	g00278608

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Illustration 11	g00279603

11. Install gerotor assembly (4) and spacer (5) in the pump body. Make sure that gerotor assembly (4) is aligned with pin (14) in the sleeve assembly, as shown.

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Illustration 12	g00278607

12. Install O-ring seal (3) in cap (2) .

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Illustration 13	g00278434

13. Position cap (2) on the gerotor assembly.

14. Install seven bolts (1). Tighten the bolts in the following manner:
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    Illustration 14	g00279604

    1. Tighten the bolts in the numerical sequence. (See Illustration 14.) The initial torque for the bolts is 14.1 ± 2.8 N·m (125 ± 25 lb in).

    2. Tighten the bolts again in the numerical sequence. (See Illustration 14.) The final torque for the bolts is 28.2 ± 2.8 N·m (250 ± 25 lb in).

End By: Install the steering metering pump. Refer to Disassembly and Assembly, "Metering Pump (Steering) - Install".