Service Manual May 2018Function Manifold64 GR ™ • QS™R • QS™ W Part No. 1275811GT4-2Valve Adjustments -Function ManifoldNote: Perform this test from the ground with theplatform controls. Do not stand in the platform.Note: Verify the hydraulic oil level is at the FULLmark on the hydraulic tank.How to Adjust the System ReliefValve1 Locate the system relief valve on the functionmanifold (schematic item I).1 test port2 system relief valve2 Connect a 0 to 5000 psi / 0 to 350 barpressure gauge to the test port on the functionmanifold (schematic item A).3 Chock both sides of the wheels at the steerend of the machine.4 Remove the platform controls from theplatform.5 Turn the key switch to platform controls andpull out the red Emergency Stop button to theon position at both ground and platformcontrols.6 Move and hold the joystick fully in eitherdirection while observing the pressure readingon the pressure gauge. Note the pressure.Refer to Specifications, Hydraulic ComponentSpecifications.7 Turn the machine off. Hold the system reliefvalve with a wrench and remove the cap(schematic item I).8 Adjust the internal hex socket. Turn itclockwise to increase the pressure orcounterclockwise to decrease the pressure.9 Install the relief valve cap.10 Repeat steps 5 and 6 to confirm the reliefvalve pressure.
