793C Off-Highway Truck Machine Systems Caterpillar

Gear Pump (Brake Release and Oil Cooling) - Disassemble

Usage:

793C 4AR

Disassembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	1P-0510	Driver Group	1
B	5P-1720	Seal Pick	1

Start By:

Remove the gear pump. Refer to Disassembly and Assembly, "Gear Pump (Brake Release and Oil Cooling) - Remove and Install" for the correct procedure.

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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.

Before disassembly, thoroughly clean the outside of the gear pump.
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Illustration 1 g00463647
Remove bolts (1) and the washers. Separate gear pump (2) from gear pump (3). The weight of gear pump (2) is approximately 39 kg (86 lb). The weight of gear pump (3) is 40 kg (88 lb).
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Illustration 2 g00463667
Remove O-ring seals (4) and O-ring seal (5) from gear pump (2).
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Illustration 3 g00463669
Mark bolts (6) for installation purposes. Remove bolts (6) and the washers.
Remove pump cover (7).
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Illustration 4 g00463670
If necessary, remove dowels (8) from pump cover (7).
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Illustration 5 g00463671
Position pump cover (7) on suitable blocks. Use Tooling (A) to remove bearings (9) from pump cover (7).
If necessary, remove dowels (10) from pump cover (7).
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Illustration 6 g00463672
Remove O-ring seal (11) from pump body (12). Remove spacer (15), pump body (12), drive gear (13), and idler gear (14) as a unit from pump body (16).
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Illustration 7 g00463673
Remove O-ring seal (17) from spacer (15). Remove woodruff key (18) from drive gear (13). Remove drive gear (13) and idler gear (14) from pump body (12).
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Illustration 8 g00463675
Remove spacer (15) from pump body (12).
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Illustration 9 g00463677
If necessary, remove dowels (19) from spacer (15).
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Illustration 10 g00463683

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Illustration 11 g00463684
Remove O-ring seal (21) from pump body (12). Remove bolts (20), and the washers that hold flanges (22), pump cover (23), and seal (24) to pump body (12).
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Illustration 12 g00463685
Remove O-ring seal (25) from pump body (12). Use Tooling (A) to remove bearings (26) from pump body (12).
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Illustration 13 g00463708

Note: Idler gear (27) and drive gear (28) are identical. Identify the location of each gear for installation purposes.
Remove idler gear (27) and drive gear (28) from pump body (16).
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Illustration 14 g00463710
Use Tooling (A) to remove bearings (29) from pump body (16).
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Illustration 15 g00463714
Position gear pump (3) on suitable blocking. Remove bolts (30) and the washers.
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Illustration 16 g00463715

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Illustration 17 g00463716

Note: Bolts (31) contain thin washers (33) and thick washer (34).
Position gear pump (3). Remove bolts (31), washers (33), and washers (34). Remove pump cover (32).
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Illustration 18 g00463718
Remove O-ring seal (35) and bearings (36) from pump cover (32).
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Illustration 19 g00463719
Use Tooling (A) to remove lip seal (37) from pump cover (32).
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Illustration 20 g00463720
Remove drive gear (38) and idler gear (39) from pump body (40).
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Illustration 21 g02721600
Remove woodruff key (41) from gear shaft (42). Remove pump body (40).
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Illustration 22 g00463722
Use Tooling (A) to remove bearings (43) from pump body (40). If necessary, remove dowels (44).
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Illustration 23 g00463723
Turn over pump body (40). If necessary, remove dowels (45).
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Illustration 24 g00463725
Remove O-ring seal (47), drive gear (46), and idler gear (45) from pump body (48).
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Illustration 25 g00463748
Remove pump body (48) from adapter assembly (49).
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Illustration 26 g00463752
Remove O-ring seal (52) from pump body (48). If necessary, remove bolt dampers (50). Use Tooling (A) to remove bearings (51) from pump body (48).
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Illustration 27 g00463758
Remove coupler assembly (54) from adapter assembly (49). If necessary, remove dowels (53).
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Illustration 28 g00463771
Use Tooling (B) to remove retaining ring (55) from coupler assembly (54).