TROUBLESHOOTING
2-3
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ML50-30 MAINTENANCE LIFT
TESCO EQUIPMENT LLC
Section 3: Troubleshooting
1. GENERAL INFORMATION
WARNING
ONLY QUALIFIED TECHNICIANS, WHO HAVE BEEN TRAINED IN THE USE AND OPERATION
OF THIS EQUIPMENT, SHOULD ATTEMPT ANY TROUBLESHOOTING. THE CHASSIS WHEELS
MUST BE CHOCKED TO PREVENT THE HI-LIFT UNIT FROM MOVING IN EITHER DIRECTION.
THE MAINTENANCE PROP MUST BE INSTALLED FOR SUPPORT WHENEVER THE
PLATFORM IS RAISED FOR MAINTENANCE OR ADJUSTMENTS. FAILURE TO FOLLOW GOOD
SAFETY PRACTICES DURING MAINTENANCE OR TROUBLESHOOTING COULD RESULT IN
DEATH OR SERIOUS INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT.
The information contained in this section is provided as a guide to assist technical service personnel in
troubleshooting operational malfunctions in the ML5-30 Lift Unit hydraulic and electrical systems.
1. Before starting troubleshooting procedures, verify that the correct operating procedures were
used. An incorrect operating procedure can cause apparent malfunctions.
2. The most important practice to observe when working on the hydraulic system is cleanliness.
Serious damage can result quickly from foreign material in the hydraulic system. When a
hydraulic system is opened, cap or plug all ports and openings to keep foreign material and
moisture-laden air from entering the system. DO NOT use Teflon tape or pipe compound on
straight threads.
NOTE: Refer to the troubleshooting chapter in the chassis manufacturer’s manual for chassis
troubleshooting instructions.
Aug. 05
Property of American Airlines
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