March 01 2017 1Comment

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.

  1. 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 friction clutch.
    • Do not repair the hoist with However,this is not suitable for regular check of  brake, fiction clutch and  limit switch.
    • Attach warning sign of “danger” both on 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 power source when the hoist is being repaired. However, this is not suitable for the  check of 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 you hands and other parts of body won’t be knocked by the moving  load.

  2. Lubrication
chain hoist replace gear oil
Replacing gear oil of Electric Chain Hoist
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
In  order  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 according  to  local law and  regulations.

3. Replacement of  chain

Whether 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 chain . Refer for  replacement of  single  fall  chain and  double fall  chain  respectively.
  • Single  fall  chain
    • Take  down  stopper from  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  load side.
    • Install chain spring or  cushion rubber and  bottom hook  taken  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 new  chain.
  • Double fall  chain
    • Take  down  stopper from  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  load side.
    • Feed all  load  side  end  of new  chain  into  idle  sheave.
    • Ensure that chain  does  not  twist  during  the  whole  linking  process  when  chain end is  connected to  link  with  chain  pin.
    • Install chain spring  or  cushion rubber and  stopper taken  down  from  the  old  chain to  no-load side  of new  chain

4. 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  status of  important 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 there are  defects and  damage 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  take down 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 examination. Regular exam includes daily check items.
      • Normal 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 detailed check and  repair report. The  report should be  taken care of by professional personnel.

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