Compressor A belts

  1. RonA

    RonA specialist in repairing sealed for life equipment

    Messages:
    1,654
    Location:
    Stockton on Tees, UK
    The A belts on my compressor have been showing signs of stretching & after several adjustments, there was no adjustment left so I thought it’s time for new belts.
    The originals were clearly marked A46 so I ordered a replacement set from a reliable source.
    However on arrival the new A46 belts seem no shorter than the originals. Is there any variation between different manafactuters.
    RonA
     
  2. slim_boy_fat

    slim_boy_fat Forum Supporter

    I wouldn't have thought so. :dontknow:
     
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  3. Greeves246 Member

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    318
    Location:
    Cheshire uk
  4. 500e

    500e Always buy fire insurance a flood is hard to start

    Messages:
    4,969
    Location:
    SWest UK
    Got 2 for a drill same No's no adjustment :dontknow: had worked for 20 years with originals
     
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  5. rikrobson

    rikrobson Member

    Messages:
    3,856
    Location:
    Perth, Scotland
    But you said the originals had streched, so the new ones would need to be shorter or they will be over sized like the original ones
     
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  6. 8ob

    8ob Forum Supporter

    Messages:
    6,701
    Location:
    moscow on thames
    With anything running multi belts you need to source matched sets, there is a + or- tolerance which can amount to 6mm belt length difference not including variations in width. Normal off the shelf belts cause havoc where the "shorter" belt gets destroyed doing all the work until its worn in/knackered. A decent belt supplier can source matched sets off the same production run.

    Bob
     
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  7. timgunn1962 Member

    Messages:
    128
    Location:
    Lancashire UK
    Modern belts don’t usually seem to stretch much. What usually seems to happen is that the belts wear on the surfaces of the vee and the effective pitch length gets a bit longer. The pulleys can also wear, reducing their effective diameter. Usually, the wear is worst on the small pulley which, on a compressor, is the motor pulley and cheap/easy to change.

    New belt and, if needed, new small pulley should see you right. Cast Iron pulley and taper lock bush is the best way to replace the pulley.

    Compressors are usually a right Mildred to tension. Using a moulded-notch spa/xpa belt makes it easier to roll the belts off and on without moving the motor: not the “correct” way to do it, but works for me.
     
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  8. Malky Member

    Messages:
    144
    Location:
    Scotland
    How long you had it? Sounds like the last owner chucked a couple of belts on to get it out the door rather than fitting the proper ones.
     
  9. RonA

    RonA specialist in repairing sealed for life equipment

    Messages:
    1,654
    Location:
    Stockton on Tees, UK
    To answer some of the points raised.
    The compressor was put together myself, after buying separate vee twin compressor, Reservoir cylinder, brooks motor & then fitted with safety valve & auto cutout/in switch. The original vee belts when fitted still had a fair amount of adjustment available. The set up although somewhat long in the tooth has performed well & was built in stages when my finances were not as plentiful.
    Timgunn’s comments about belt removal struck a chord. The compressor unit has a cast iron pulley & the motor has one mentioned by tim i.e a patent taper lock design (can’t remember who made them). Whilst I doubt the one on the motor will have worn I am beginning to wonder about the cast iron compressor pulley. I think an in depth inspection is in order. The belt tension is adjusted using the slots in the motor chassis & tethered horizontal bolts to push the motor into place before to achieve belt tension before tightening down the motor chassis holding down bolts.
    I think I may be order some A45 belts to bring it back in adjustment range
    Thanks for all the comments
    RonA
     
  10. Malky Member

    Messages:
    144
    Location:
    Scotland
    Sounds like a plan, as you built it yourself are you sure both pulleys are A size spec.?
     
  11. RonA

    RonA specialist in repairing sealed for life equipment

    Messages:
    1,654
    Location:
    Stockton on Tees, UK
    Yes the pulley & vee twin comp were a complete unit with identical vee form slots to the motor pulley
    RonA
     
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