April 2018 Service and Repair ManualHydraulic PumpsPart No. 1279835GT ZX®-135/70 935 Adjust the function pump standby pressure.Turn the adjustment screw clockwise toincrease the pressure or counterclockwise todecrease the pressure. Tighten the set screw.6 Turn the engine off and remove the pressuregauge.How to Adj ust the Functi on Pum p Press ure Com pens atorHow to Adjust the Function PumpPressure CompensatorNote: Two people will be required to perform thisprocedure.1 Confirm the system relief pressure is set tospecification. Refer to Repair Procedure,Valve Adjustments - Function Manifold.2 Connect a 0 to 5000 psi / 0 to 350 barpressure gauge to the test port on the functionmanifold3 Start the engine from the ground controls andchange the rpm to high idle.4 Push and hold the high speed function enablebutton (rabbit symbol). Do not activate anyboom functions.5 Observe the pressure reading on the pressuregauge.Result: The gauge should show 2900 psi /200 bar.Result: If the gauge does not show 2900 psi /200 bar, proceed to step 6 to adjust thefunction pump pressure compensator.6 Loosen the set screw for the pressurecompensator adjustment screw.1 pressure compensator set screw2 pressure compensator adjustment screw7 Adjust the pressure compensator pressure.Turn the adjustment screw clockwise toincrease the pressure or counterclockwise todecrease the pressure. Tighten the set screw.Component damage hazard.Do not adjust the pressurecompensator higher thanspecified.8 Turn the engine off and remove the pressuregauge.
