Terex RT700 - Telescope Function Troubleshooting

TROUBLESHOOTING
BOOM HOIST AND TELESCOPE INOPERATIVE OR ERRATIC
CAUSE REMEDY
Pump disconnect not engaged ...............................................................Engage pump disconnect.
Main relief valve malfunctioning..........................................................See section on “Relief Valves”.
Low oil level..........................................................................................Add oil as required.
Rotary manifold leaking internally .......................................................Reset rotary manifold.
Tandem pump faulty .............................................................................See section on “Pumps”.
TELESCOPE FUNCTION ONLY - WILL NOT OPERATE
CAUSE REMEDY
Load too great........................................................................................Tilt boom pedal only halfway forward, not all the
way forward (“high speed”) . Reduce load or set
boom length before lifting load.
Both port relief valves sticking .............................................................See section on “Relief Valves”.
Hose plugged or liner collapsed............................................................Replace hose.
BOOM EXTENSION JERKY OR ERRATIC
CAUSE REMEDY
Inadequate grease on boom pad surfaces..............................................Lubricate boom where pads contact boom.
Wear pads damaged ..............................................................................Replace wear pads.
Wear pads shimmed to boom too tight..................................................Reshim wear pads.
Faulty counter balance valve.................................................................Replace counter balance valve.
Loose chain system ...............................................................................Adjust chains as required.
BOOM TELESCOPE CIRCUIT
RT700 Series Page 5 - 16 Issued: August 2003