REV GSection 4 • Repair Procedures July 20074 - 106 GS-3390 • GS-4390 • GS-5390 Part No. 72863How to Adjust the Steer ReliefValve1 Connect a 0 to 3000 psi / 0 to 250 bar pressuregauge to the test port (item F or AB) on thefunction manifold.2 Start the engine from the platform controls.3 Press and hold the function enable switch andhold the steer thumb rocker switch in the rightdirection. Allow the wheels to completely turn tothe right, then continue holding the switch whileobserving the pressure reading on the pressuregauge. Note the pressure. Refer to Section 2,Specifications.4 Turn the engine off. Use a wrench to hold therelief valve and remove the cap (item E or AE).5 Adjust the internal hex socket. Turn it clockwiseto increase the pressure or counterclockwise todecrease the pressure. Install the relief valvecap.Tip-over hazard. Do not adjustthe relief valve higher thanspecified.6 Repeat steps 2 through 3 to confirm the reliefvalve pressure.7-9Valve Adjustments -Drive ManifoldHow to Adjust the ChargePressure Relief Valve1 Connect a 0 to 600 psi / 0 to 50 bar pressuregauge to test port #2 (item BG or EC) on thedrive manifold.2 Start the engine from the platform controls.3 Drive the machine slowly in the directionindicated by the blue arrow on the platformcontrols and observe the pressure reading onthe pressure gauge. Refer to Section 2,Specifications.Component damage hazard.Driving the machine in reverse willplace excessive pressure on thepressure gauge and will damagethe gauge. Do not drive themachine in a reverse direction.4 Turn the engine off. Use a wrench to hold thecharge pressure relief valve and remove thecap (item BH or EE).5 Adjust the internal hex socket. Turn it clockwiseto increase the pressure or counterclockwiseto decrease the pressure. Install the relief valvecap.6 Repeat steps 2 through 3 to confirm the reliefvalve pressure.MANIFOLDS
