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How to test the electric hoist?

How to test the electric hoist?
Electric hoist testing is always required after installation. the 15 ton electric hoist has gone through various tests.


After inspection and preparation, the electric hoist operation test can proceed. The running test of electric hoist can be divided into the following three steps: no-load test, static load test, and movement test.

Electric hoist no-load tests
Electric hoist no-load test are mainly divided into the three parts, the electric hoist travelling test, crane travel test, and no-load hook test.

Electric hoist travel test
• Start the electric hoist of electric hoist
• Make the electric hoist run back and forth along the rail more than 3 times
• Test limit switch to make sure is sensitive and reliable.
• The driven wheels must touch rail all the time, the space between positive wheel and rail should be not more than 1mm.

Crane travel test
• Make the electric hoist run back and forth along the rail more than 3 times. Each time running distance is 3m at least.
• Wheels of the electric hoist must not stuck rail.

No-load hook test
• Lift the empty hook up and down more than 3times.
• Examine brake and lifting limiter.
• All traveling and lifting mechanism must work stable, no vibration and shock

Electric hoist static load tests
• Before Static load testing, the no-load test must be qualified.
• Set crane on one end of rail. Trolley/hoist lifts the rated capacity and travel along the crane girder back and forth.
• Unload the loads and set the trolley to one end of the crane girder.
• Hanging a plumb in middle of crane girder to examine the original bending degree. Operating trolley/hoist come to middle of girder, lifting loads 1.25times of rated capacity, up to 100mm, and keep this condition 10min on both sides of girder.
• Then examine the bending degree again.
• Then unload the capacity, to check if girder has any permanent change. This testing should do 3times.
• Then examine the final bending degree which should be bigger than 0.8L/1000.
• Place trolley/hoist stop in middle, lifting rated capacity to test girder’s resilience downwarping, which should not be more than L/700. For single girder electric hoist, the resilience downwarping should be not more than L/600.

Movement load tests
• Lift loads of 0.5 time, 0.7 time, 1 time and 1.1 times of rated capacity of the electric hoist.
• Make trolley/hoist travel several times.
• If no problem is observed, start crane traveling mechanism and run the electric hoist several times.
• Lifting mechanism must be operated 10-15min, traveling mechanism must work 20min or 10times.
• Ensure the brake is workable, reducer has no noise, no vibration, and temperature is normal, no oil leaking;
• Make sure the lubricating system is fine.
• Make sure all limiters and safety device are reliable.
• And electrical box is fine, temperature is normal, no noise, no vibration, cable/line connecting is not burnt.

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