768C TRACTOR & 769C TRUCK POWER TRAIN Caterpillar


Pressure Control Valve (7G2612)

Usage:

(1) 4M2399 Spring:

Length under test force ... 2.24 in.(56.9 mm)

Test force ... 24.4 ± .2 lb.(109 ± 1 N)

Free length after test ... 3.26 in.(82.8 mm)

Outside diameter ... .600 in.(15.24 mm)

(2), (14) Install dowels so they are below the surface of each face of valve body.

(3) 3S8059 Spring:

Length under test force ... 1.35 in.(34.3 mm)

Test force ... 3.02 ± .24 lb.(13.5 ± 1.1 N)

Free length after test ... 1.78 in.(45.2 mm)

Outside diameter ... .297 in.(7.54 mm)

(4) 3S1374 Spring:

Length under test force ... 1.44 in.(36.6 mm)

Test force ... 22.4 ± 1.8 lb.(109 ± 8 N)

Free length after test ... 1.84 in.(46.7 mm)

Outside diameter ... .562 in.(14.27 mm)

(5) Spacers of the relief valve for the load piston:

Thickness of one 2S674 Spacer ... .036 in.(0.91 mm)

One 2S674 Spacer will change pressure ... 18.2 psi(125 kPa)

Thickness of one 2S675 Spacer ... .016 in.(0.41 mm)

One 2S675 Spacer will change pressure ... 8.0 psi(55 kPa)

(6), (8) 5M9548 Springs for the poppet valves:

Length under test force ... .84 in.(21.3 mm)

Test force ... 1.00 ± .08 lb.(4 ± 0.4 N)

Free length after test ... 1.34 in.(34.0 mm)

Outside diameter ... .48 in.(12.2 mm)

(7) 2S668 Spring (inner) for the load piston and modulation relief valve:

First test:

Length under test force ... 4.989 in.(126.72 mm)

Test force ... 13.5 ± .9 lb.(60 ± 4 N)

Second test:

Length under test force ... 3.719 in.(94.46 mm)

Test force ... 68.4 ± 2.6 lb.(305 ± 12 N)

Free length after test ... 5.30 in.(134.6 mm)

Outside diameter ... .812 in.(20.62 mm)

(9), (12) Torque for 15 bolts that hold the covers to the body ... 22 ± 3 lb. ft.(28 ± 4 N·m)

(10) 2S667 Spring (outer) for the load piston and modulation relief valve:

First test:

Length under test force ... 4.989 in.(126.72 mm)

Test force ... 21.4 ± 3.0 lb.(95 ± 13 N)

Second test:

Length under test force ... 3.719 in.(94.46 mm)

Test force ... 246.0 ± 9.9 lb.(1095 ± 44 N)

Free length after test ... 5.11 in.(129.8 mm)

Outside diameter ... 1.297 in.(32.94 mm)

(11) Spacers of the modulation relief valve:

Thickness of one 8S6214 Spacer ... .016 in.(0.41 mm)

One 8S6214 Spacer will change pressure ... 4.5 psi(31 kPa)

Thickness of one 8S6215 Spacer ... .036 in.(0.91 mm)

One 8S6215 Spacer will change pressure ... 10.0 psi(70 kPa)

(13) 2S3620 Spring:

Length under test force ... 2.12 in.(53.8 mm)

Test force ... 10 ± .8 lb.(45 ± 4 N)

Free length after test ... 3.68 in.(93.5 mm)

Outside diameter ... .700 in.(17.78 mm)

Caterpillar Information System:

768C TRACTOR & 769C TRUCK POWER TRAIN Shift Pressure Valve (7G4102)
768C TRACTOR & 769C TRUCK POWER TRAIN Automatic Selector Valve (3P4991)
768C TRACTOR & 769C TRUCK POWER TRAIN Governor Cut-Off Valve (3P4992)
768C TRACTOR & 769C TRUCK POWER TRAIN Accumulator Group For The Governor (9P4231)
768C TRACTOR & 769C TRUCK POWER TRAIN Sequence And Pressure Control Valve (8P3877)
768C TRACTOR & 769C TRUCK POWER TRAIN Shift Cylinder Group (2P9217)
768C TRACTOR & 769C TRUCK POWER TRAIN Shift Governor And Drive
768C TRACTOR & 769C TRUCK POWER TRAIN Hydraulic Controls For The Transmission
768C TRACTOR & 769C TRUCK POWER TRAIN Shift Control Group For The Transmission (9D8615)
768C TRACTOR & 769C TRUCK POWER TRAIN Power Take-Off Drive
768C TRACTOR & 769C TRUCK POWER TRAIN Transmission
768C TRACTOR & 769C TRUCK POWER TRAIN Transfer Gears
768C TRACTOR & 769C TRUCK POWER TRAIN Accumulator Group For No. 6 Clutch (3P8575)
768C TRACTOR & 769C TRUCK POWER TRAIN Differential And Bevel Gear
768C TRACTOR & 769C TRUCK POWER TRAIN Nospin Differential Group (2G3840)
768C TRACTOR & 769C TRUCK POWER TRAIN Final Drive
768C TRACTOR & 769C TRUCK POWER TRAIN Rear Axle Housing
768C TRACTOR & 769C TRUCK POWER TRAIN Tire Valve (4D2004)
768C TRACTOR & 769C TRUCK POWER TRAIN Rear Wheel Group
768C TRACTOR & 769C TRUCK POWER TRAIN Adjustment Of The Rear Wheel Bearings
768C TRACTOR & 769C TRUCK POWER TRAIN Systems Operation
768C TRACTOR & 769C TRUCK POWER TRAIN Testing And Adjusting
768C TRACTOR & 769C TRUCK POWER SHIFT TRANSMISSION Testing and Adjusting
768C TRACTOR & 769C TRUCK POWER TRAIN DISASSEMBLY & ASSEMBLY Body Support (FT1437)
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