Service and Repair Manual April 2018Manifolds46 GTH-636 Part No. 1287209GT7-4Valve Adjustments - SecondaryFunction ManifoldHow to Set the Parki ng Br ake Sy stem Pr ess ureHow to Set the Parking BrakeSystem PressureNote: Be sure that the hydraulic oil level is visible inthe inspection glass of the hydraulic tank.1 Install a 0 to 1000 psi / 0 to 100 bar pressuregauge into test port 'TP' at the top of theprimary function manifold, Refer to PrimaryFunction Manifold Components.2 Start the engine. Allow the engine to idle afterwarming the engine to operating temperature.3 Without operating any machine controls,observe the reading on the pressure gauge.Result: The pressure gauge reads 650 ±20 psi/ 44.8 ±1.4 bar. The pump is functioningcorrectly.Result: The pressure gauge fails to read 650±20 psi / 44.8 ±1.4 bar. The pressure settingneeds to be adjusted. Refer to RepairProcedure, How to Adjust the Function PumpPressure.4 Turn the machine off. Remove the pressuregauge from the test port.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.5 Install a 0 to 1000 psi / 0 to 100 bar pressuregauge into test port 'TPB' at the top of thesecondary function manifold, Refer toSecondary Function Manifold Components.
