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    • Manxman in exile
    • By Manxman in exile 12th Apr 19, 9:54 PM
    • 2,598Posts
    • 2,249Thanks
    Manxman in exile
    Faulty track pump
    • #1
    • 12th Apr 19, 9:54 PM
    Faulty track pump 12th Apr 19 at 9:54 PM
    I've got a Zefal hp malamut track pump. (Must be about 20 plus years old!).

    Got the tires up to pressure on my bike ok last weekend, but when I came to do my wife's bike there was clearly something wrong with the pump. During the up-stroke there seemed to be a hissing of escaping air from the barrel of the pump and the tires actually seemed to be deflating. Had resort to a hand pump and that seemed ok (but bl00dy hard work!) so I presume it's a fault with the track pump and not the tire valve.

    Does this sound like I need a new track pump?
Page 1
    • martindow
    • By martindow 13th Apr 19, 11:28 AM
    • 8,202 Posts
    • 4,774 Thanks
    • #2
    • 13th Apr 19, 11:28 AM
    • #2
    • 13th Apr 19, 11:28 AM
    I imagine the washer on the plunger has perished or worn. Zefal supply spares

    if 20 year old pump parts are still available.

    I've got pumps working a bit better by putting some oil inside the pump to improve the sealing. I hesitate to recommend this as it is probably not a good long term solution as it may be detrimental to the pump or tyres.
    • Manxman in exile
    • By Manxman in exile 15th Apr 19, 2:13 PM
    • 2,598 Posts
    • 2,249 Thanks
    Manxman in exile
    • #3
    • 15th Apr 19, 2:13 PM
    • #3
    • 15th Apr 19, 2:13 PM
    Thanks. I seem to remember as a kid (many decades ago!) using Vaseline(?) to make a bike pump washer more airtight. Will take apart and have a look.

    EDIT: I note on their website they mention using a few drops of oil.
    Last edited by Manxman in exile; 15-04-2019 at 2:19 PM. Reason: Add
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