BOOM AS 2969443 - Caterpillar

Replace the clutch solenoid valves, tighten the clamp screws to the required torque of 18 to 31 N m (13 to 23 lb ft).
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Remove the third clutch solenoid valve tighten the cap screw to the required torque of 18 to 31 N m (13 to 23 lb ft).
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Replace the three O-ring seals to the forward/high clutch valve.
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Replace the forward high clutch valve. Tighten the capscrews to the required torque of 7 to 10 N m (5 to 7.5 lb ft).
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Replace the main pressure regulator valve cartridge and tighten to the required torque of 45 to 64 N m (33 to 47 lb ft).
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Replace the relief valve cartridge and tighten to the required torque of 23 to 30 N m (17 to22 lb ft).Troubleshooting Guide
Test Procedure
A systematic pressure checking procedure should be followed if a malfunction of the transmission is indicated. These checks should be carried out while the transmission is still in the vehicle so that true operating conditions are created. Pressure checks are essential since a failure in the hydraulic system may not be easily traceable when the transmission is stripped down on a bench. All pressure checks should be carried out with the transmission oil temperature at 80 to 85° C (176 to 185° F) and the engine speed maintained at 2000 to 2500 rpm.As a safety precaution the vehicles brake for parking should be applied (if fitted).All pressure test ports have a 9/16 inch thread. A pressure gauge is required that will measure up to 20 bar (290 psi). For test port locations refer to the Illustrations in ""Location of Test Ports"".The chart over page briefly summarizes the pressures that should be found at each port. This chart also shows which clutches are engaged in each gear.Charts
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