Terex T780 - Swing Pumps Circuit

Outrigger Circuit
ALL OUTRIGGERS INOPERATIVE
CAUSE REMEDY
Electrical malfunction See section on “Electrical Controls”
Outrigger relief valve malfunctioning See section on “Relief Valves”
Outrigger diverter valve malfunctioning Repair or replace
Line to or from steer pump plugged or liner
collapsed
Clear blockage or replace hose
Low oil level Add oil as required
Steer pump worn or damaged See section on “Pumps”
INDIVIDUAL OUTRIGGER INOPERATIVE
CAUSE REMEDY
Electrical malfunction See section on “Electrical Controls”
Cylinder leaking internally See section on “Cylinders”
Hold valve on jack cylinder not operating Repair or replace
Line plugged or collapsed between outrigger
valve and cylinder
Replace hose.
Beam wedged in extended position Extend jack far enough to pick up end of
beam and retract. Replace slider pad block
on top of outrigger box to pick up end of
beams
OUTRIGGERS WILL NOT LIFT MACHINE
CAUSE REMEDY
Outrigger relief valve malfunctioning See section on “Relief Valves”
Outrigger diverter valve malfunctioning Repair or replace
Outrigger pump worn or damaged See section on “Pumps”
Cylinder by-passing See section on “Cylinders”.
JACK CYLINDER DRIFTS DOWN (OUT & DOWN)
CAUSE REMEDY
Hold valve on top of cylinder malfunctioning Replace cartridge
Thermal relief cartridge mounted in wrong
end
Check for proper assembly
Cylinder by-passing See section on “Cylinders”
T300-1_T500-1_T780
Troubleshooting
410 P/N 12261-683
REVISED: January 2015