September 2016GR-20J • GR-26J Part No. 227656xTABLE OF CONTENTSSection 4 Repair ProceduresIntroduction .................................................................................................. 4 - 1Platform Controls1-1 Circuit Boards .................................................................................... 4 - 21-2 Controller Adjustments ....................................................................... 4 - 3Platform Components2-1 Platform ............................................................................................. 4 - 72-2 Platform Overload System ................................................................. 4 - 8Jib Components3-1 Jib Cylinder ...................................................................................... 4 - 10Mast Components4-1 Mast Assembly ................................................................................. 4 - 114-2 Lift Cylinder ...................................................................................... 4 - 24Ground Controls5-1 Level Sensor .................................................................................... 4 - 26Hydraulic Pump6-1 Function Pump ................................................................................. 4 - 27Function Manifold7-1 Function Manifold Components ........................................................ 4 - 307-2 Valve Adjustments - Function Manifold ............................................ 4 - 32Steer Axle Components8-1 Hydraulic Tank ................................................................................. 4 - 35