988K XE Wheel Loader Machine Systems Caterpillar

Piston Pump (Steering) - Assemble

Usage:

Assembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	437-3776	Fixture As	1
	1U-9129	Adapter Plate	1
	1U-5750	Engine Stand	1
B	4C-8359	Lifting Eye Assembly	2
D	1P-0510	Driver Gp	1
E	-	Loctite 242	-
F	6V-2055	Grease	1

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Illustration 1	g06248518

Install O-ring seal (68) into cover (67).
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Illustration 2 g06248513
Install cover (67) and bolts (66). Tighten bolts (66) to a torque of 28 ± 7 N·m (248 ± 62 lb in). Install plug (65) and the O-ring seal. Install plug (64) and the O-ring seal.
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Illustration 3 g06248859
Install bearing (63) and retaining ring (62) onto shaft assembly (61).
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Illustration 4 g06248509
Use a soft faced hammer to install shaft assembly (61) into housing (43).
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Illustration 5 g06249254

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Illustration 6 g06248624
Install O-ring seals (60), O-ring seal (59) into seal carrier (57). Use Tooling (D) to install lip seals (58) into seal carrier (57).
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Illustration 7 g06248862
Apply Tooling (E) to bolts (56).
Install seal carrier (57) and bolts (56) onto the pump housing. Tighten bolts (56) to a torque of 28 ± 7 N·m (248 ± 62 lb in).
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Illustration 8 g06248472
Install bearing cradles (55) into housing (43).
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Illustration 9 g06248297
Install actuators (52), retainers (54), and bolts (53) onto swashplate (50). Tighten bolts (53) to a torque of 12 ± 1 N·m (106 ± 9 lb in).
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Illustration 10 g06248295
Install bearing assemblies (51) onto swashplate (50).
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Illustration 11 g06248290
Install swashplate (50) into housing (43).
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Illustration 12 g06249303
Install shims (48) and spring assembly (49) onto barrel (46).
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Illustration 13 g06248271
Install hold down ball (47) onto barrel (46).
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Illustration 14 g06248259
Install retainer (45) and pistons (44) onto barrel (46).
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Illustration 15 g06248257
Install rotating group (42) into housing (43).
Install O-ring seal (41) into housing (43). Install control actuator (38), spring (40), and bias actuator (39) into housing (43).
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Illustration 16 g06249041

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Illustration 17 g06248928
Install set screw (37A) and (37B) into head assembly (30). Install set screw (37A) to a depth of 14.3 ± 0.2 mm (0.563 ± 0.008 inch). Install set screw (37B) to a depth of 18 mm (0.71 inch). Install nuts (36). Tighten nuts (36) to a torque of 190 ± 15 N·m (140 ± 11 lb ft).
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Illustration 18 g06248247
Install plug (35) and the O-ring seal into head assembly (30). Install plug (34) and the O-ring seal into head assembly (30).
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Illustration 19 g06248187
Install plug (33) and the O-ring seal into head assembly (30).
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Illustration 20 g06248182
Install port plate (32) into head assembly (30).
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Illustration 21 g06248163

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Illustration 22 g06248159

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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.
Attach Tooling (B) and a suitable lifting device to head assembly (30). The weight of head assembly (30) is approximately 26 kg (57 lb). Install head assembly (30) onto the pump housing. Install bolts (31). Tighten bolts (31) to a torque of 460 ± 60 N·m (339 ± 44 lb ft).
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Illustration 23 g06248639
Install orifice (27) into pump control (7). Install O-ring seal (28) and plug (29) into pump control (7).
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Illustration 24 g06248636

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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 retainer (21), spring (22), spring (23), retainer (24), O-ring seal (25), and adapter (26) into pump control (7).
Install retainer (15), spring (16), spring (17), retainer (18), O-ring seal (19), and adapter (20) into pump control (7).
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Illustration 25 g06248634
Install spool (14), O-ring seal (13), and plug (12) into pump control (7). Install spool (10), O-ring seal (9), and plug (8) into pump control (7). Install O-ring seals (11) into pump control (7).
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Illustration 26 g06248097
Install pump control (7) and bolts (6). Tighten bolts (6) to a torque of 12 ± 3 N·m (106 ± 27 lb in).
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Illustration 27 g06248082
Install O-ring seal (5) onto flange (4).
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Illustration 28 g06248079
Apply Tooling (E) to bolts (3). Install flange (4) and bolts (3).
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Illustration 29 g06248087
Install coupler (2) and O-ring seal (1) into the flange. Remove the pump from Tooling (A) or suitable fixture.