Troubleshooting Your PIERCE Chain Hoist

by Anthony Fairchild on 11/11/16 10:39 AM

chain hoistGet your chain hoist up and running with this handy troubleshooting guide. Listed below are common issues with the chain hoist with all possible causes and their solutions. If you continue to experience difficulty after trying the solutions in this guide call us! PIERCE is here to help.

Symptom: Hoist will not operate

Possible causes of the hoist not operating:

Loss of power

Solution: Check circuit breakers, switches, fuses and connections on power lines/cable.

Wrong voltage or frequency

Solution: Check voltage and frequency of power supply against the rating on the nameplate of the motor.

Hoist overload

Solution: Reduce load to within rated capacity of hoist.

Improper, loose or broken wire in the hoist electrical system

Solution: Shut off power supply, check wiring connection on hoist control panel and inside push button pendant.

Brush wear

Solution: Inspect both motor brushes (see manual Table 8-2) and replace if necessary.

Fuses burned out

Solution: Replace fuses.

Motor burned out

Solution: Replace motor frame/stator, shaft/rotor and any other damaged parts.

Symptom: Hoist lifts but will not lower

Possible causes of the hoist will not lower:

Faulty switch in pendant

Solution: Check electrical continuity. Check electrical connections. Replace or repair as needed.

Broken conductor in pendant cord

Solution: Check the continuity for each contactor in the cable. If one is broken, replace the entire cable.

Symptom: Hoist lowers but will not lift

Possible causes of the hoist will not lift:

Hoist overload

Solution: Reduce load to within rated capacity of hoist.

Broken conductor in pendant cord

Solution: Check the continuity for each conductor in the cable. If one is broken, replace the entire. cable.

Faulty switch in pendant

Solution: Check electrical continuity. Check electrical connections. Replace or repair as needed.

Low voltage in hoist's power supply

Solution: Determine cause of low voltage and bring to within plus or minus 5% of voltage specified on the motor nameplate. The voltage should be measured at the hoist contractor.

Symptom: Hoist will not lift rated load or does not have the proper lifting speed

Possible causes of the hoist will not lift the rated load:

Hoist overload

Solution: Reduce load to within rated capacity.

Low voltage in hoist's power supply

Solution: Determine cause of low voltage and bring to within plus or minus 5% of the voltage specified on the motor nameplate. The voltage should be measured at the hoist contactor.

Faulty friction clutch

Solution: If abnormal operation or slippage occurs do NOT attempt to disassemble or adjust the mechanical load brake with friction clutch. Replace worn or malfunctioning mechanical load brake with friction clutch as an assembly with a new, factory adjusted part. Call 800-658-6301 for assistance.

Symptom: Load drifts excessively when hoist is stopped.

Demagnetized motor

Solution: Motor demagnetization is generally caused from using the hoist beyond its duty rating. Replace stator assembly and reduce usage to comply with the duty rating stated.

Improper gear oil

Solution: Replace oil with the correct gear oil.

Symptom: Hoist operates intermittently.

Loose connection in circuit

Solution: Check all wires and terminals for bad connections. Replace as needed.

Connectors making poor contact

Solution: Check movement of spring loaded arm, weak spring, connections and shoe. Replace as needed.

Broken conductor in pendant cord

Solution: Check for intermittent continuity in each conductor in the pendant cord. Replace the entire pendant cord if continuity is not constant.

If you're experiencing further difficulties troubleshooting chain hoist call me! To instantly receive a PDF of your PIERCE chain hoist wiring diagram, manual, and spec sheet register your PIERCE product by clicking the button below.

Click here to  Register your Product

 

Anthony_Fairchild.jpgMore Questions? Call me!

Anthony Fairchild, PIERCE Technical Service Manager

phone: 800-658-6301 email: anthony@piercearrowinc.com

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This post was written by Anthony Fairchild

I'm the technical service manager at Pierce.