7251 MARINE GEAR Caterpillar

Testing And Adjusting


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.


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.

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