MAINTENANCE
2-3
Page 4
TESCO EQUIPMENT LLC
ML50-30 MAINTENANCE LIFT
Stabilizers will not extend. Vehicle not in lift mode (Parking brake off)
Emergency stop activated
Circuit breaker tripped or blown fuse
Defective solenoid coil or relay
Damaged wiring or bad ground
Damaged or defective control switch
Defective valve cartridge
Damaged Power Take Off (P.T.O.) or pump drive
components
Emergency lowering handpump is not operating. Manual overrides not open
Upper controls will not operate with the vehicle's
engine running.
Vehicle not in lift mode (Parking brake off)
Enable switch not depressed
Stabilizers not fully deployed
Emergency stop activated
Circuit breaker tripped or blown fuse
Damaged or defective control switch
Defective enable relay
Defective solenoid coil or relay
Damaged wiring or bad ground
Damaged Power Take Off (P.T.O.) or pump drive
components
Vehicle’s engine will not turn off when the
EMERGENCY STOP SWITCH on either control
station is actuated.
Damaged or defective control switch
TROUBLESHOOTING
TROUBLE PROBABLE CAUSE
Aug. 05
Property of American Airlines
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