In the daily lifting work of the elevator, it is often encountered that the lifting platform can not rise and other problems, this article will comprehensively elaborate on such problems, the specific steps are as follows:
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First, check the cause of the failure
Daily check the starter potential when the motor load is working. Voltage hydraulic range allows ±10%
The motor does not turn
Check motor and circuit
Motor reversal
Change two of the three phase lines arbitrarily.
Motor phase loss (motor does not move and there is a click)
Check the circuit breaker and motor wiring.
The down valve is open
With the down button released, check the drop valve for power with a voltmeter. If there is no power, check the line and troubleshoot; if there is electricity, eliminate the failure of the down valve itself. The slide valve of the down valve must be kept clean and flexible to move.
Relief valve pressure is low
Readjust the relief valve. Adjust at 100% of rated load
The oil level is too low and the pump is empty
Fill up the hydraulic oil
Oil suction filter blockage
Clean up filter
Leakage in the suction section
Check the suction pipe and fittings; tighten the fittings. Replace the connector if necessary.
The indicator light is on, press the up button, the motor rotates and the lifting platform does not rise.
Check ≥ phase power contact, the motor reverses after the power is reversed, just correct the power supply. 
