December 13 2016 0Comment
electric chain hoist

How much do you know about Electric Chain Hoist maintenance?

Firstly make sure that it is professional technicians who will be carrying out the electric chain hoist maintenance activity of the electric chain hoist for you.

  • Basic To Do’s and Dont’s
    • Always keep load chain in lubrication.
    • Do not extend load chain by connecting, adding or welding extra load chain.
    • Do not touch the electrified components.
    • Do not adjust the friction clutch.
    • Do not repair the hoist with However; this is not suitable for a regular check of the brake, friction clutch and limit switch.
    • Attach warning sign of “danger” both on a power source and push-button switch during maintenance.
    • Do not operate the hoist when it is being repaired.
    • Always repair the hoist by using the LOADMATE parts. Only professional technicians are allowed to do repairing work.
    • Always shut off the power source when the hoist is being repaired. However, this is not suitable for the check of the push-button switch and power source voltage.
    • After maintenance, always test load capacity before going on to operate the hoist.
    • During shipment of parts, ensure that the moving load won’t knock your hands and other parts of the body.
  • Lubrication

Always replace gear oil by referring to rated load and operation hours in the following table. However,  replace gear oil at least every five years even if the hoist has not worked up to specified hours.

hoist manintence table
Hoist Maintenance Table

To replace gear oil,  please take off oil plug and leak cover,  drain old gear oil,  and then fill in new specialized gear oil. Using sub-standard or similar brand gear oil tends to cause abnormal friction clutch, and then result in load falling off the hoist.

Note:  Old gear oil should be disposed of according to local law and regulations.

  • Replacement of  chain

Whether the load chain should be lubricated once a  week or more frequently depends on how often it is used.

Kindly follow the following steps to replace the chain. Refer for replacement of single fall chain and double fall chain respectively.

  • Single  fall  chain
    • Takedown stopper from the no-load side.
    • Attach C-link to end chain circle.
    • Attach new chain end to  C-link.
    • Operate the hoist to lower chain.
    • Stop lowering chain when there is enough new chain on the load side.
    • Install chain spring or cushion rubber and bottom hook took down from the old chain to load side of new chain end.
    • Install chain spring or cushion rubber and stopper taken down from the old chain to no-load side of the new chain.
  • Double fall  chain
    • Takedown stopper from the no-load side.
    • Attach C-link to end chain circle.
    • Attach new chain end to  C-link.
    • Operate the hoist to lower chain.
    • Stop lowering chain when there is enough new chain on the load side.
    • Feed all load-side end of the new chain into idle sheave.
    • Ensure that chain does not twist during the whole linking process when the chain end is connected to link with the chain pin.
    • Install chain spring  or  cushion rubber and  stopper taken  down  from  the  old  chain to  no-load side  of new  chain
  • Examination
    • First examination: Before a  new or altered hoist is put into use; it should be examined by professional personnel to ensure it is up to standard.
    • Usual examination procedures can be divided into two types according to examination intervals,  which meanwhile depend on the status of essential parts and the wear-out,  deterioration and breakdown that they display. The two types here is defined as daily examination and regular examination.
    • Daily examination:  Operators or professional personnel take a  visual inspection. Check if defects and damage are referring to the recommended items, including the ones displayed during regular examinations. It should be professional personnel who decide if the defects or damage will bring danger or need detailed inspection.
    • Regular examination: Professional personnel take a  visual inspection. Take an overall review of the hoist according to recommended items in “regular examinations” section. The review can be done in hoist working areas. There is no need to take apart the whole hoist. Open or takedown the cover  plate and other parts for examination. It should be professional personnel who carry out regular examination items and decide whether it will bring danger or needs an overall investigation. Routine exam includes daily check items.
      • Standard use:  check it once a  year.
      • Frequent use: check it once half a  year.
      • Excessive frequent use:  check it once a  quarter.
      • In special case or seldom use: for the first time,  examine it according to the intervals recommended by technicians;  do it under the technician’s guide later.

Occasional Use of  Electric Chain Hoist

  • When the hoist leaves unused for more than one month, and less than one year, please check the items required. Then it can be put into use.
  • When the hoist leaves unused for more than one year,  Then it can be put into use.

Examination  Recording: When checking the items during time intervals,  please record and keep a detailed check and repair report. The report should be taken care of by professional personnel.

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