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

Note: The main control valve in Illustration 1 and Illustration 2 are for machines that are equipped with an auxiliary function (logging fork, side dump bucket, multipurpose bucket). Machines that are not equipped with an auxiliary function will not have auxiliary control valve (3).

Illustration 1	g00699917
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 that hold the end caps ... 35 ± 3 N·m (26 ± 2 lb ft)

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

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

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

(8) Torque for the five bolts ... 80 ± 4 N·m (60 ± 3 lb ft)

Illustration 2	g00887826
Main control valve

(9) 7S-8491 Springs

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

Test force ... 19.0 ± 1.5 N (4.31 ± 0.35 lb)

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

Outside diameter ... 30.18 mm (1.188 inch)

(10) Thickness of one 1U-0470 Shim ... 0.178 mm (0.0070 inch)

(11) Thickness of one 8J-1898 Shim ... 0.250 mm (0.0098 inch)

(12) Torque for the six bolts that hold the end caps ... 35 ± 3 N·m (26 ± 2 lb ft)

(13) Torque for the plug ... 430 ± 40 N·m (320 ± 30 lb ft)

(14) Thickness of one 1U-0471 Shim ... 0.508 mm (0.0200 inch)

Note: A 1U-0471 Shim (14) must be in contact with spring (15). Use the required number of shims in order to achieve a spring force value of 290 ± 10 N (65.19 ± 2.24 lbf). Adjust the spring force value with the retainers and the springs at 75.00 ± 0.10 mm (2.953 ± 0.004 inch).

(15) 162-9206 Spring

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

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

Outside diameter ... 51.50 mm (2.023 inch)

Note: The 162-9206 Spring should not be compressed less than 28.35 mm (1.116 inch).

(16) 3G-8991 Spring

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

Test force ... 111.2 ± 5.6 N (25 ± 1.3 lb)

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

Outside diameter ... 25.79 mm (1.015 inch)

(17) 1J-8960 Spring

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

Test force ... 12.5 ± 1.0 N (2.78 ± 0.22 lb)

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

Outside diameter ... 28.58 mm (1.125 inch)