SPRING 5392846 - Caterpillar

Clutch Actuating Pressure
A clutch that will not engage can be caused by either a loss in clutch hydraulic pressure (oil pump outlet) or by a defective clutch. The clutch hydraulic actuating pressure should be tested first.
CLUTCH ACTUATING PRESSURE TEST (Typical Example)Remove the plug from the oil pressure test location on the left side of the control valve and install a 5S4648 Hose, 8M2886 Gauge [0 - 600 PSI (0,0 - 42,2 kg/cm2)] and the necessary fittings.With the engine operating at full load RPM the gauge should indicate 55 - 70 PSI (3,9 - 4,9 kg/cm2) with the selector lever in NEUTRAL position.With the control lever moved to engage either the ahead or astern clutch, a 245 10 PSI (17,2 0,7 kg/cm2) reading should be indicated on the gauge.