768C TRACTOR & 769C TRUCK HYDRAULIC SYSTEM Caterpillar


Control Valve (3G2930)

Usage:

(1) Torque for bolts ... 60 ± 2 lb. ft.(80 ± 3 N·m)

(2) 3G6849 Relief Valve:

Pressure setting (on machine) ... 2200 +50 or -0 psi(15 200 +345 or -0 kPa)

Pressure change, one 3H2549 Shim ... 70 psi(480 kPa)

Pressure change, one 2J2866 Shim ... 35 psi(240 kPa)

(3) 5S4664 Spring for dump valve:

Length under test force ... 1.14 in.(28.9 mm)

Test force ... 8.6 ± .9 lb.(39 ± 4 N)

Free length after test ... 1.43 in.(36.3 mm)

Outside diameter ... .50 in.(12.7 mm)

(4) 4J7066 Spring for check valve:

Length under test force ... 2.03 in.(51.6 mm)

Test force ... 3.9 ± .3 lb.(17 ± 1 N)

Free length after test ... 3 in.(76.2 mm)

Outside diameter ... 1.12 in.(28.4 mm)

(5) 9J5006 Spring on valve spool:

Length under test force ... 1.66 in.(42.2 mm)

Test force ... 46.2 ± 2.1 lb.(189 ± 9 N)

Free length after test ... 5.57 in.(141.5 mm)

Outside diameter ... 2.13 in.(54.1 mm)

(6) Torque for plug ... 80 ± 5 lb. ft.(110 ± 7 N·m)

(7) 2J6089 Spring for pilot valve:

Length under test force ... 1.43 in.(36.3 mm)

Test force ... 64.20 to 70.96 lb.(286 to 315 N)

Free length after test ... 1.74 in.(44.2 mm)

Outside diameter ... .49 in.(12.4 mm)

Caterpillar Information System:

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769C TRUCK VEHICLE SYSTEMS Cab Rear Cover
769C TRUCK VEHICLE SYSTEMS Front Tire And Rim
769C TRUCK VEHICLE SYSTEMS Front Wheel Bearings And Duo-Cone Seal (Earlier)
769C TRUCK VEHICLE SYSTEMS Front Wheel Bearings And Duo-Cone Seal (Later)
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