April 2018 Service and Repair ManualHydraulic PumpPart No. 1287209GT GTH-636 39How to Adj ust the Functi on Pum p Standby Pr ess ureHow to Adjust the Function PumpStandby Pressure1 Connect a 0 to 1000 psi / 0 to 100 barpressure gauge to test port 'TP' on the primaryfunction manifold. See 7-1 or 7-2, PrimaryFunction Manifold Components.2 Start the engine and allow the engine to run atlow idle.3 Observe the pressure reading on the pressuregauge.Result: The pressure gauge reads 650 ±20 psi/ 44.8 ±1.4 bar. The pump is functioningcorrectly. Proceed to step 6.Result: The pressure gauge fails to read 650±20 psi / 44.8 ±1.4 bar. The pressure settingneeds to be adjusted. Proceed to step 4.4 Loosen the set screw for the standby pressureadjustment screw.5 Adjust the function pump standby pressure.Turn the adjustment screw clockwise toincrease the pressure or counterclockwise todecrease the pressure. Tighten the set screw.1 Standby Pressure Adjustment set screw2 Standby pressure adjustment3 Pressure compensator adjustment4 Pressure compensator adjustment setscrew6 Turn the engine off and remove the pressuregauge.Bodily injury hazard. Sprayinghydraulic oil can penetrate andburn skin. Loosen hydraulicconnections very slowly to allowthe oil pressure to dissipategradually. Do not allow oil tosquirt or spray.
