TROUBLESHOOTING
2-3
Page 5
ML50-30 MAINTENANCE LIFT
TESCO EQUIPMENT LLC
Platform mounted spotlight not operating.
Burned fuse
Dead or low battery
Defective light bulb in spotlight
Corrosion build up on light bulb terminals
Faulty toggle switch on light assembly
Faulty ground at spotlight caused by corrosion
Faulty wiring harness
Hi-lift settles or does not hold position when control
is released.
Air trapped in a lift cylinder
Misadjusted, faulty or sluggish counter balance hold
valve on the lift cylinder
Defective lift cartridge valve
Hi-lift unit racked or twisted in one direction during
raising or after reaching required height.
Exceeding maximum load capacity
Off center load on work platform
Air trapped in lift cylinder
Misadjusted, faulty or sluggish counter balance hold
valve on the lift cylinder
Leak in one of the lift cylinder
Low hydraulic fluid level in reservoir
Faulty hi-lift scissors center pivot pin, attach pin, or
roller axle
Hi-lift unit racks or twists during lowering.
Off center load on work platform
Air trapped in lift cylinder
Misadjusted, faulty or sluggish counter balance hold
valve on the lift cylinder
Uneven holding valve release pressure
TROUBLESHOOTING
TROUBLE
PROBABLE CAUSE
Aug. 05
Property of American Airlines