966G Wheel Loader and 972G Wheel Loader Hydraulic System Caterpillar

Note: The main control valve in Illustrations 1 and 2 is for machines with an auxiliary function (logging fork, side dump bucket, multipurpose bucket, etc). Machines without an auxiliary function will not have auxiliary control valve (3) .

Illustration 1	g00471378
Top View of the Main Control Valve (1) Lift control valve. (2) Tilt control valve. (3) Auxiliary control valve.

(4) Torque for the six bolts ... 35 ± 3 N·m
(26 ± 2 lb ft)

(5) Torque for the five bolts ... 80 ± 4 N·m
(59 ± 3 lb ft)

(6) Torque for the line relief valves for the tilt cylinder ... 65 ± 5 N·m (48 ± 4 lb ft)

(7) Torque for the line relief valves for the auxiliary cylinders ... 65 ± 5 N·m (48 ± 4 lb ft)

(8) Torque for the main relief valve ... 110 ± 10 N·m
(80 ± 7 lb ft)

(9) Torque for the six bolts ... 35 ± 3 N·m
(26 ± 2 lb ft)

Illustration 2	g01306259
Bottom View of the Main Control Valve

(10) 7S-8491 Springs

Length under test force ... 25.4 mm (1.00 inch)

Test force ... 19.17 ± 1.56 N (4.309 ± 0.351 lb)

Free length after test ... 41.1 mm (1.62 inch)

Outside diameter ... 30.18 mm (1.188 inch)

(11) 1U-0470 Shims

Thickness of one shim ... 0.178 mm (0.0070 inch)

(12) 8J-1898 Shims

Thickness of one shim ... 0.250 mm (0.0098 inch)

(13) 1U-0471 Shims

Thickness of one shim ... 0.508 mm (0.0200 inch)

Note: A 1U-0471 Shim (13) must be in contact with spring (14) . Use the required number of shims in order to achieve a load of 290 ± 10 N (65 ± 2 lb) with the retainers and springs at 75.00 ± 0.10 mm (2.953 ± 0.004 inch).

(14) 162-9206 Spring

Length under test force ... 51.00 mm (2.008 inch)

Test force ... 1160 ± 92 N (260 ± 21 lb)

Free length after test ... 63.00 mm (2.480 inch)

Outside diameter ... 51.53 mm (2.029 inch)

(15) 3G-8991 Spring

Length under test force ... 43.37 mm (1.708 inch)

Test force ... 111 ± 6 N (25 ± 1 lb)

Free length after test ... 75.05 mm (2.955 inch)

Outside diameter ... 25.79 mm (1.015 inch)

(16) 1J-8960 Spring

Length under test force ... 64.92 mm (2.556 inch)

Test force ... 12.4 ± 1.0 N (2.8 ± 0.2 lb)

Free length after test ... 82.6 mm (3.25 inch)

Outside diameter ... 28.58 mm (1.125 inch)

(17) Torque for the plug ... 415 ± 40 N·m (310 ± 30 lb ft)