345C MHPU Mobile Hydraulic Power Unit Machine Systems Caterpillar

Main Hydraulic Pump - Assemble

Usage:

Assembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
B	138-7574	Link Bracket	2
C	1P-1855	Retaining Ring Pliers	1
D	1P-1863	Retaining Ring Pliers	1
E	5P-5197	Retaining Ring Pliers As	1
F	5P-4758	Retaining Ring Pliers As	1

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Illustration 1	g01174818

Install pistons (80) .

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Illustration 2	g01174817

Install plugs (79) and the O-ring seals.

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Illustration 3	g01174816

Install covers (78) and bolts (75) .

Install nuts (77) and screws (76) .

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Illustration 4	g01174814

Raise the temperature of bearing (74) .

Install bearing (74) .

Use Tooling (D) in order to install retaining ring (73) .

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Illustration 5	g01174725

Raise the temperature of bearing (72) .

Install bearing (72) .

Use Tooling (D) in order to install retaining ring (70) .

Use Tooling (D) in order to install retaining ring (71) .

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Illustration 6	g01174723

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Illustration 7	g01174724

Install bearing carriers (69) and bolts (68) .

Install shaft assembly (67) .

Install shaft assembly (64) .

Use Tooling (F) in order to install retaining ring (65) .

Use Tooling (F) in order to install retaining ring (63) .

Install shim (66) .

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Illustration 8	g01174702

Install gasket (61), gear (58), and shim (62) .

Use Tooling (E) in order to install retaining ring (58) .

Install gear (57A) and shim (60) .

Use Tooling (D) in order to install retaining ring (59) .

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Illustration 9	g01174701

Attach Tooling (B) and a suitable lifting device to cover (56) .

Install cover (56) and bolts (55) .

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Illustration 10	g01174699

Install swashplates (54) and plates (53) .

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Illustration 11	g01175099

Install springs (49) .

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Illustration 12	g01175092

Install bearing (52) .

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Illustration 13	g01175192

Install pistons (50) and retainer (51) .

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Illustration 14	g01175041

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Illustration 15	g01174697

Use a suitable string in order to retain the pistons during installation.

Install barrels (48) and port plates (47) .

Install gasket (46) .

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Illustration 16	g01174696

Attach Tooling (B) and a suitable lifting device to head assembly (45) .

Install head (45) .

Install bolts (44) and bolts (43) .

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Illustration 17	g01174693

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Illustration 18	g01174694

Install spool (35), spool (37), sleeve (36), and spool (41) .

Install lever (33), lever (32), and lever (31) .

Install spring (38) and retainer (39) .

Use Tooling (C) in order to install retaining ring (40) .

Install O-ring seals (34) .

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Illustration 19	g01174692

Install spring (30) .

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Illustration 20	g01174691

Install plug (29) .

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Illustration 21	g01174686

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Illustration 22	g01174687

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Illustration 23	g01174688

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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.

Install spring (26), sleeve (27), and piston (28) .

Install retainer (25), spring (24), and spring (23) .

Install the O-ring seals, cover (22), and bolts (21) .

Install the O-ring seals, cover (20), and bolts (19) .

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Illustration 24	g01175044

Install plug (18) and plug (17) .

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Illustration 25	g01174684

Install cover (16) and bolts (15) .

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Illustration 26	g01174682

Install the O-ring seals, cover (14), and bolts (13) .

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Illustration 27	g01174681

Install O-ring seals (13) .

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Illustration 28	g01174695

Install valve (42) .

Repeat Steps 33 through Steps 49.

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Illustration 29	g01174678

Install valve (12) and bolts (11) .

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Illustration 30	g01174680

Install impeller (10) .

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Illustration 31	g01174679

Install the O-ring seal, cover (9), and bolts (8) .

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Illustration 32	g01174676

Install the O-ring seals, solenoid (6), and bolts (7) .

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Illustration 33	g01174677

Install O-ring seals (5) .

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Illustration 34	g01174675

Install housing (4) and bolts (3) .

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Illustration 35	g01174641

Install the backup ring, the O-ring seal, sensor (2), and bolts (1) .

Repeat Step 57 for the opposite side.

End By:

Install the gear pump. Refer to Disassembly and Assembly, "Gear Pump (Pilot) - Install".
Install the main hydraulic pump. Refer to Disassembly and Assembly, "Main Hydraulic Pump - Install".