Terex GS90D-4695 Service And Repair Manual

Also see for Genie GS-3390: Maintenance manual Maintenance manual Operator's manual Service and repair manual Service and repair manual

December 2023 Service and Repair ManualManifoldsPart No. 1325652GT GS™-3390 • GS™-4390 • GS™-5390 9111 Adjust the internal hex socket. Turn itclockwise to increase the pressure orcounterclockwise to decrease the pressure.Install the relief valve cap.12 Repeat this procedure beginning with step 7.13 Fully lower the platform.14 Using a suitable lifting device, add anadditional weight to the platform not to exceed20% of the maximum rated work load at fullheight. Secure the weight to the platform.Refer to the specifications below.Additional test weightGS-3390 500 lbs227 kgGS-4390(most models - refer to capacity indicatordecal)375 lbs170 kgGS-4390(some models - refer to capacity indicatordecal)450 lbs204 kgGS-5390 375 lbs170 kg15 Activate the platform up function and attemptto raise the platform.Result: The platform does not raise. Proceedto step 21.Result: The platform lifts. Proceed to step 16.16 Lower the platform to the stowed position.17 Turn the machine off. Hold the system reliefvalve with a wrench and remove the cap.18 Adjust the internal hex socket. Turn itcounterclockwise to decrease the pressure.Install the relief valve cap.19 Start the engine.20 Repeat this procedure beginning with step 15.21 Turn the machine off and remove the weightfrom the platform.How to Adj ust the Steer R elief ValveHow to Adjust the Steer ReliefValveNote: Refer to Function Manifold Component list tolocate the steer relief valve.1 Connect a 0 to 3000 psi / 0 to 250 barpressure gauge to the test port (item AB) onthe function 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 turnto the right, then continue holding the switchwhile observing the pressure reading on thepressure gauge. Note the pressure. Refer toSpecifications, Hydraulic ComponentSpecifications.4 Turn the engine off. Use a wrench to hold therelief valve and remove the cap (item AE).5 Adjust the internal hex socket. Turn itclockwise to increase the pressure orcounterclockwise to decrease the pressure.Install the relief valve cap.Tip-over hazard. Do not adjustthe relief valve higher thanspecified.6 Repeat steps 2 through 3 to confirm the reliefvalve pressure.