BogMonster Posted April 26, 2016 Share Posted April 26, 2016 I have had one of the 12V double pump compressors for a few years now, doesn't get much use but has worked well on the few occasions I have used it. It's the Britpart variety but they are all much the same in appearance. I was just blowing up a dumper tyre (didn't look at the size but it's a 6 tonne dumper so probably a 40" tyre) and got it to about 25psi when the compressor got progressively slower and then popped the fuse - I guess it had been running for somewhere around 5 minutes continuously. I replaced it with a 30 amp fuse which was the largest I had (not sure what the old one was - it was melted) and even when not connected to anything it popped with a bright flash as soon as I switched the power on - probably seized I think. It was fairly warm but not stinky hot - certainly not enough to have seized. I have no idea what the duty cycle is but I don't think blowing up a flat dumper tyre should be beyond one of those compressors - has anybody had similar problems with them? And can anybody tell me the correct fuse rating - I've long since lost or dumped the book! Ta Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 26, 2016 Share Posted April 26, 2016 I've blown up multiple 33s with my mahoosive one from devon4x4, forget the make, 160l/mom version and 40a draw Yes it got very warm, but I think compressors do.... Does sound like yours seized.. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted April 27, 2016 Author Share Posted April 27, 2016 Ta, I have since found an online manual for it which says 30 min duty at 40psi is fine, so it shouldn't have blown up but I fear it probably has And it specifies 45A current draw, 50A fuse, though I don't know if a 50A blade fuse is readily available. I'll tackle it on the weekend and see. Quote Link to comment Share on other sites More sharing options...
L19MUD Posted April 27, 2016 Share Posted April 27, 2016 might have just heat seized? you could be lucky and now it has cooled it may have freed up Quote Link to comment Share on other sites More sharing options...
HoggyN Posted April 28, 2016 Share Posted April 28, 2016 And it specifies 45A current draw, 50A fuse, though I don't know if a 50A blade fuse is readily available. You will probably need to go to a maxi blade fuse like the ARB compressors use. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted April 28, 2016 Author Share Posted April 28, 2016 I don't know what lubricates the cylinders during operation - nothing as far as I can see? I guess heat seizure might be the cause but it only ran for a bit over 5 minutes and it's supposed to manage 30 min at 40psi at much higher ambient temp so it shouldn't have seized. It is just a normal sized blade fuse like you would find in a Defender fusebox for example. I'm not wasting money on a new fuse holder as I think it's probably had it anyway, so will short the fuse holder and if it then lets the smoke out it will go in the bin! Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 28, 2016 Share Posted April 28, 2016 I seem to remember the T-max compressor I have ( I remembered the name!) Supposedly had carbon fibre rings, and no need for lubrication. How much of that was marketing guff and how much was true I don't know Quote Link to comment Share on other sites More sharing options...
landroversforever Posted April 28, 2016 Share Posted April 28, 2016 I seem to remember the T-max compressor I have ( I remembered the name!) Supposedly had carbon fibre rings, and no need for lubrication. How much of that was marketing guff and how much was true I don't know Could be true.... some dry vacuum roughing pumps have carbon rings and vanes. Quote Link to comment Share on other sites More sharing options...
HoggyN Posted April 28, 2016 Share Posted April 28, 2016 I think the rings are normally graphite carbon rather than carbon fibre. Quote Link to comment Share on other sites More sharing options...
elbekko Posted April 29, 2016 Share Posted April 29, 2016 We used a T-Max on a few occasions for pumping up Mouse's 40" tyres, which worked fine. It does sound like yours is seized, unfortunately. Take it apart and see what went wrong/what can be salvaged? Quote Link to comment Share on other sites More sharing options...
BogMonster Posted May 2, 2016 Author Share Posted May 2, 2016 I pulled it to bits and ... nothing apparently wrong. The pistons move freely and so does the motor. I put it back together and it now works. The piston seals looked like a sort of PTFE ring or something, bit of grease on them but no sign of being hot. I sprayed some silicone into the intake when it was running and managed to start a small fire when the overspray went into the motor and ignited, but otherwise fine and I put the flames out with some swearing Fooked if I know what was wrong Quote Link to comment Share on other sites More sharing options...
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