REV CSection 4 • Repair ProceduresJuly 2007Part No. 72863 GS-3390 • GS-4390 • GS-5390 4 - 119STEER AXLE COMPONENTS9-4Oscillating Axle Option(after serial number GS9004-41690)How theOscillating Axle FunctionsWhen driving the GS-90 with the platform in thestowed position, the oscillating axle functionensures that all four wheels maintain solid contactwith the ground, delivering the maximum tractionavailable.When driving the GS-90 with the platform raisedabove the down limit switch height, the oscillatingaxle function is limited in that the oscillatingcylinders only respond to input from the oscillatingaxle limit switches, located on the rear axle.Oscillate Stowed Relay CR84Terminal 30 of the Oscillate Stowed relay, CR84,receives power from the Platform Down limitswitch, LS6. When the platform is raised aboveLS6, power to terminal 30 will be cut.Terminal 86 of CR84 is connected to pin J2-C5 atthe ECM. Pin J2-C5 is powered anytime the BrakeRelease valve coil Y2 is energized, thus energizingCR84 terminal 87 and, ultimately, all four oscillatingvalve coils, allowing oil to pass between theoscillating cylinders. J2-C5 continues to powerterminal 86 for 0.5 seconds after Y2 is de-energized.Oscillate Raised Relay CR85Terminal 30 of the Oscillate Raised relay, CR85,receives power from the Power relay, CR42. Whenpower is cut to terminal 86 of CR42 via key switchor either Emergency Stop button, power to terminal30 of CR85 will be lost.Terminal 86 of CR85 receives continuous powerfrom pin J2-C6 when the ECM is powered until anoutrigger is lowered to the ground, at which pointthe power from J2-C6 is cut.CR84OSCILLATESTOWEDCR85OSCILLATERAISEDY57 Y56 LEFT OSCY54 OSC FLOATY57 RIGHT OSCY55Y55 OSC ENABLEY54 Y5687A8586 30871287A8586 30871187A8586 30872LS22RIGHTOSCILLATELIMIT SWITCHLS23LEFTOSCILLATELIMIT SWITCHN.C.H.O.N.C.H.O.CR42POWERLS6PLATDOWNLIMITSWITCHN.C.J2-C5J2-C6U5ELECTRONICCONTROLMODULEJ2-C1/C3B1 12 VOLT BATTERY-+B1CB220AFROM PLATFORM CONTROLS EMERGENCY STOPOscillate Limit Switches LS22, LS23The right and left oscillating limit switches, LS22and LS23 respectively, are normally closed limitswitches, held in the open position when themachine is on a level surface.When the left rear or right rear wheel 'drops', thelimit switch will relax and close its circuit, sendingpower to the appropriate oscillating valve coil.
