315B Excavator Machine Systems Caterpillar

Main Hydraulic Pump - Assemble

Usage:

315B 1SW

Assembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	1P-0510	Driver Group	1

Note: Be sure that all of the parts of the main hydraulic pump are thoroughly clean prior to assembly. During the assembly of the main hydraulic pump, lubricate all of the parts with clean hydraulic oil. Check the condition of all O-ring seals that are used in the main hydraulic pump. If any of the O-ring seals are damaged, use new parts for replacement. Make sure that the components of the rear body assembly are separated from the components of the front body assembly during the assembly process. Do not mix the components for the rear body assembly with the components for the front body assembly.

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NOTICE

Failure to properly assemble parts or failure to follow established procedures can lead to damage of the parts and assembly. To avoid damage to parts, always identify and mark the parts so that they can be installed in the same location. Ensure that gear surfaces align. Never force parts during assembly.

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Illustration 1	g00370015

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Illustration 2	g00370014

Install coupling (81) and two bearings (80) in the block assembly.

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Illustration 3	g00370013

Install plate (79) on both sides of block assembly (76) .

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Illustration 4	g00370012

Install O-ring seals (77) and (78) on block assembly (76) .

Use the following procedure to assemble barrel assembly (65) .
1. Install nine springs (72) in the barrel.
1. Install washer (73) and retainer guide (74) on the barrel.
1. Install nine piston assemblies (69) in retainer (71) in the piston's original location. Install the retainer with the piston assemblies in barrel (70). Make sure that piston assemblies (69) are installed in the piston's original bore in the barrel.

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Illustration 6	g00369875

Install plate (68) in the front body assembly. Install pin (67) in the front body assembly.

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Illustration 7	g00369873

Note: Do not allow the components to separate during the installation of barrel assembly (65). If the parts in the barrel assembly separate during the installation in the front body assembly, damage to the pump will result.

Carefully install barrel assembly (65) in the front body assembly. Make sure that the components of barrel assembly (65) do not separate.

Install O-ring seals (66) in the front body assembly.

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Illustration 8	g00369852

Install two O-ring seals (64) and swash plate (63) in front body assembly (62) .

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Illustration 9	g00370274

Put front body assembly (62) in the body assembly's original position on block assembly (76) .

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Illustration 10	g00493370

Install washer (56) and spacer (57) on shaft (61) .

Install bearing (54), race (58), spacer (59) and retaining ring (55) on shaft (61) .

Put shaft assembly (53) in support plate (52) .

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Illustration 11	g00370276

Put support plate (52) and shaft assembly (53) in position in the front body assembly. Install four socket head bolts (51). Tighten the four socket head bolts to a torque of 235 ± 20 N·m (175 ± 15 lb ft).

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Illustration 12	g00369699

Apply 5P-3413 Pipe Sealant in the bore of cover (48). Use Tool (A) to install lip type seal (49) in the cover until the seal makes contact with the counterbore in the cover. Install the lip type seal with the sealing lip toward the inside of the cover. Lubricate the lip of the seal with clean hydraulic oil.

Install O-ring seal (50) on cover (48) .

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Illustration 13	g00370278

Put cover (48) in the cover's original position in the support plate. Install four socket head bolts (47). Tighten the four socket head bolts to a torque of 12 ± 1 N·m (9 ± 1 lb ft).

Follow the procedure in Step 4 through Step 13 in order to assemble the rear body assembly of the main hydraulic pump.

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Illustration 14	g00370017

Install O-ring seal (84) on cover (83) .

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Illustration 15	g00370016

Put cover (83) in the cover's original position in the rear body assembly. Install four socket head bolts (82). Tighten the four socket head bolts to a torque of 12 ± 1 N·m (9 ± 1 lb ft).

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Illustration 16	g00370393

Put the rear body assembly in position on block assembly (76). Install four socket head bolts (75). Tighten the four socket head bolts to a torque of 235 ± 20 N·m (175 ± 15 lb ft).

Use the following procedure in order to assemble pressure and flow compensator valves (46) and (4) .
Note: Make sure that the components of pressure and flow compensator valve (4) are separated from the components of pressure and flow compensator valve (46). Do not mix the components of the valves during the assembly process.
1. Install the O-ring seal on fitting (44). Install the fitting in the valve body. Orient the position of the fitting, as shown.
1. Install seal (43) in retainer (41). Install spring seat (42), spring (40) and retainer (41) in the valve body.
1. Put spool (39) and lever assembly (38) in position in the valve body.
1. Install spool (36) and lever assembly (37). Install the pin (not shown) in order to hold the components together.
1. Install seal (35) on spool (34). Install spool (34) in the valve body.
1. Install spool (33) and lever assembly (32) in the valve body.
1. Install seals (31) on plugs (29) and (30) .
1. Install plugs (29) and (30) in the valve body.
1. Install retaining rings (28) .
1. Install seal (25) and three O-ring seals (26) in cover (27) .
1. Put cover (24) in position on the valve body. Install four socket head bolts (23). Tighten the four socket head bolts to a torque of 12 ± 1 N·m (9 ± 1 lb ft).
1. Install O-ring seal (22), spring seat (19), spring (20) and spring (21) in the valve body, as shown.
1. Put cover (17) in position on the valve body. Install four socket head bolts (18). Tighten the four socket head bolts to a torque of 12 ± 1 N·m (9 ± 1 lb ft).
1. Install the seat, spring (15) and retaining ring (16) in the valve body.
1. Install O-ring seal (14) on case (13). Install the piston and case (13) in the valve body.
1. Install spring (9), sleeve (10), pin (12) and five O-ring seals (11) in the valve body, as shown.
1. Put cover (8) in position on the valve body. Install four socket head bolts (7). Tighten the four socket head bolts to a torque of 12 ± 1 N·m (9 ± 1 lb ft).
1. Install O-ring seal (5) and eight O-ring seals (6) in the valve body.
1. Put pressure and flow compensator valve (46) in position on the front body assembly. Install four socket head bolts (45). Tighten the four socket head bolts to a torque of 29 ± 3 N·m (21 ± 2 lb ft).
1. Put pressure and flow compensator valve (4) in position on the rear body assembly. Install four socket head bolts (3). Tighten the four socket head bolts to a torque of 29 ± 3 N·m (21 ± 2 lb ft).
1. Install the O-ring seal in the cover of the main hydraulic pump. Install pilot pump (2) and two socket head bolts (1). Tighten the two socket head bolts to a torque of 40 ± 8 N·m (30 ± 6 lb ft).

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NOTICE

To avoid system damage, make sure that the hydraulic motor is properly filled with hydraulic oil before start-up.

End By: Install the main hydraulic pump and the pump drive coupling. Refer to Disassembly and Assembly, "Main Hydraulic Pump - Install" in this manual.