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Common electrical faults and trouble-shooting method for mobile bus and truck lift

Author:Martin Chen Date:6/27/2019 10:43:24 PM

Common electrical faults and trouble-shooting method

1. After the lifter finishes its operation, should pull the power switch to OFF position.
2. In the general rising or descending of the lifter, should not fully rely on up and down travel switches to shut down the lifter. As the travel switch is controlled by upper limit and lower limit, the appropriate height should be set according to the actual working height to avoid the damage to the travel switch due to the frequent elevating and knocking.
3. When the clearance between steel ball seating of the operating nut safety mechanism and safety nut is less than 7mm, should change screw nut immediately and don’t fully rely on the safety mechanism till the screw nut is worn away.


Fault
Reason
Trouble-shooting method
General action or single action out of work
General action or single action out of work
Switch on and check the switch
Loss of phase or overload for one electrical motor several electrical motors
Check each electrical motor
NO.1 upright post rising or descending switch damaged ,line circuit broken
Repair or change travel switch, connect the line circuit
NO.2 upright post electrical motor work, but no.2 upright post and general action not working
No.1 upright post rising or descending switch damaged, line circuit obstructed
Repair or change travel switch, connect the travel switch circuit
NO.1 and 2 upright post electrical motors work, but no.3 and 4 upright posts not working
NO.3 upright post rising or descending switch damaged ,circuit broken
Repair or change travel switch, connect the travel switch circuit
No.1,2 and 3 upright post electrical motors work, but no.4 upright post not working
NO.4 upright post rising or descending switch damaged, circuit broken
Repair or change travel switch, connect the travel switch circuit
The lifters electrical motor can only one-way operate.
The travel switch at the reverse end not working, circuit broken
Repair or change travel switch, connect the travel switch circuit
The lifter elevating button is opposite to the actual operation.
Reversed incoming lines of power or electrical motor
Adjust power or electrical motor phase lines
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