January 2013Part No. 84793 GS-84 • GS-90Section 4 Repair ProceduresIntroduction .................................................................................................. 4 - 1Platform Controls1-1 Circuit Boards ..................................................................................... 4 - 2Platform Components2-1 Platform ............................................................................................. 4 - 32-2 Platform Extension Deck .................................................................... 4 - 5Scissor Components3-1 Scissor Assembly, GS-3384 and GS-3390 ........................................ 4 - 73-2 Scissor Assembly, GS-4390 ............................................................ 4 - 133-3 Scissor Assembly, GS-5390 ............................................................ 4 - 213-4 Wear Pads ....................................................................................... 4 - 283-5 Lift Cylinder(s) .................................................................................. 4 - 30Engines4-1 RPM Adjustment .............................................................................. 4 - 354-2 Engine Fault Codes - Ford Models .................................................... 4 - 354-3 Engine Repair ................................................................................... 4 - 354-4 Flex Plate ......................................................................................... 4 - 36Ground Controls5-1 Auxiliary Platform Lowering .............................................................. 4 - 415-2 Controller Adjustments ..................................................................... 4 - 415-3 Software Configuration ...................................................................... 4 - 525-4 Level Sensor - Models without Outriggers ......................................... 4 - 585-5 Level Sensor - Models with Outriggers .............................................. 4 - 605-6 Engine Fault Codes - Ford Models .................................................... 4 - 65Hydraulic Pumps6-1 Lift/Steer Pump ................................................................................ 4 - 676-2 Drive Pump ...................................................................................... 4 - 69TABLE OF CONTENTSxi
