Thomas Blue Tongue MK IV stopping

Yes Anthony continuous duty is why I bought my first one in 1994 and also the MK IV but not impressed with this one at present.
I bought this one second hand in zip up Thomas bag like new and did not look as though it was ever used.

Thanks 4wheeler, looks like they have an office over here in Kewdale WA.

A very helpful member.Thanks.

Hi Alby

This is what I think was wrong with mine. It worked fine if the vehicle was running, but died when it was running off the second battery.

Once I sorted the issue with the second battery - no more problems and still runs well today.

Cheers

Anthony

Motor was running with revs up on hand throttle. Battery one week old and charge correct. When cut out occurred, waited 5 minutes and was able to continue inflating for one patrol tyre then same thing happened.Waited 10 minutes and finally finished inflations.

Cheers

Sastra
Maybe look at power feed from battery to compressor , unsure if you connect direct to battery?
But recently had same issue on another vehicle and found thermal overload mounted "inline" on power supply, rated at 20 amp and compressor drags 40 amps, causing headache and concern towards compressor.
Not an expert ,but maybe something to look at
Cheers
Flighty

Thanks Flighty, have had some advice re maybe a voltage issue causing compressor to pull too high amps and trigger the thermal overload so you may be on the right track here.
What I don't get is the MK IV now plugs into the same plug under drivers seat as the original Thomas which had no issues.
Interestingly last year I had both pumps with me to speed up inflation time, using old Thomas to inflate caravan tyres while using MK IV directly off second battery with it's orig alligator clips to inflate Patrol tyres. There was no problem coming direct from battery so this may be a clue to my problem.
I would have thought both pumps would require same volts and amps but maybe someone could tell me otherwise.

Cheers

Michael,

The compressor current draw is directly related to the pumping capacity of the compressor so your MK IV is going to draw more current than your earlier compressor.

The behaviour you describe sounds like an auto-resetting circuit breaker tripping out on excess current then resetting after a short cooling period. This breaker is somewhere on the supply to your plug under the seat, probably at or near the battery. It may have been satisfactory for your earlier smaller compressor but needs upgrading for the MK IV. A 60A rated circuit breaker should be suitable.

Thanks Allan, the thermal overload mechanism is inside the back of the pump under a vented cover held in place by 2 long screws.
The mechanism is a bi-metal system consisting of 2 points looking like a old time distributor points. I'm told if too much heat is created, the points open and current stops.
Wiring from battery to switch in dash and connection under drivers seat may need upgrading. Here's hoping this is the answer.

cheers
Mike