312C Excavator Machine Systems Main Hydraulic Pump

NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat^® products. Dispose of all fluids according to local regulations and mandates.

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Illustration 1	g00816760

Install the hub on the pump shaft. Install setscrews (30). Tighten setscrews (30) to a torque of 110 ± 10 N·m (81 ± 7 lb ft).
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Illustration 2 g00816757
Install coupling (28) on hub (29). Secure the coupling with bolts (27). Tighten bolts (27) to a torque of 220 ± 10 N·m (162 ± 7 lb ft).
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Illustration 3 g00817018
Install bolts (28A) in the flywheel. The bolts connect the flywheel to the coupling.
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Illustration 4 g00995524
Install Tooling (A) and a suitable lifting device on the main hydraulic pump (26). The weight of main hydraulic pump (26) is approximately 136 kg (300 lb).
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Illustration 5 g00816755
Bolts (28A) in the flywheel must align with the holes in the coupling. Refer to illustration 3. Move main hydraulic pump (26) into position and install bolts (25).
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Illustration 6 g00816735
Connect harness assemblies (23) and install bolt (24) for the clip.
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Illustration 7 g00816699
Connect hose assembly (22). Connect harness assembly (21) and install bolt (20) for the clip.
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Illustration 8 g00816643
Check the O-ring seal in pipe assembly (19) for wear and for damage. If necessary, replace the O-ring seal. Position the pipe assembly and install bolts (18). Connect tee assembly (17) to the main hydraulic pump.
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Illustration 9 g00816640
Connect hose assemblies (13), (14), (15), and (16).
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Illustration 10 g00816588
Connect hose assemblies (8), (9), (10), (11), and (12).
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Illustration 11 g00816276
Install sheet (support) (5). Install lower sheet assembly (7) and upper sheet assembly (6).
Secure cables with clips (3). Secure harness assemblies with cable straps (4).
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Illustration 12 g00816174
Install sheet (1) under the engine flywheel housing.
Fill the hydraulic system with hydraulic oil. Refer to Operation and Maintenance, "Lubricant Viscosities and Refill Capacities". Refer to Operation and Maintenance, "Hydraulic System Oil Level - Check".