Mega Grunt compressors

Submitted: Saturday, Jan 05, 2008 at 22:51
ThreadID: 53152 Views:5222 Replies:3 FollowUps:1
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Last week when the L/H front tyre came off the bead while driving through sand at Robe I got the trusty Mega Grunt out of it's bag and started it up. When you need 'em the most they always stuff up.TYPICAL.

It rattled like it had a broken conrod or something.

Well today I pulled it apart and found the culprit.

On each end of the electric motor there is a shaft that a counter balancer clamps to which also has a short shaft on that that the conrod bearing just slips onto with nothing retaining it.

Well that counter balancer thingo had came loose and was spinning on that and wore the shaft the conrod bearing slips on. Ma bit of a mess but was able to file it round again and the bearing now slips on. Slightly loose, not a tight fit as it should be but it works.

The other thing that stuffed up was on the other piston the little flap with a hole under it riveted to the piston had broken off. That is now soldered back on and will see how long that will last.

I did not like the way the pump had been put together from the factory with sand getting into everything. There are no rubber or paper gaskets to seal anything as I had found out today. There was sand and dirt in everything including the electric motor around the brushes and in the bottom end of the crank case. The only place that was clear of that mentioned was above the piston.

After cleaning it all out, from now on I will not be placing the compressor on the ground.

That's enough from me, just thought I would let know my thoughts on the Mega Grunt.

Cheers Luke

P.S. The pump is nearly three years old and has done bugger all work in comparison to the amount some of yours would have done.
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Reply By: Member - Matthew C (WA) - Saturday, Jan 05, 2008 at 23:07

Saturday, Jan 05, 2008 at 23:07
Great news as i just bought one of these!!!

Anyhow i will see how mine goes,maybe they are a little better now than three years ago cause i compared mine toa busharnger style and it didnt LOOK all that different if at all.
AnswerID: 280008

Reply By: mike w (WA) - Saturday, Jan 05, 2008 at 23:21

Saturday, Jan 05, 2008 at 23:21
Sounds like a bit of bad luck. I too have one of these, no problems as yet, however I have mounted mine in a plastic tool box- keeps all manner of sand and undesirables out.

I hope it keeps going for you
AnswerID: 280010

Reply By: Outnabout David (SA) - Sunday, Jan 06, 2008 at 10:02

Sunday, Jan 06, 2008 at 10:02
Hey Luke,

Is that a single or double Mega Grunt compressor.

I always used ARD compressors cos with my job at the time we were ARB distributors. After I left I bought a Bushranger Max Air and this was over $300.
Has worked well for three years. In my new job I got hold of some "Max Air"/"Mega Grunt" type compressors which I retail at $150 and make a huge profit.Anyway that is an aside.

For the last two years I have used one of these compressors as my No 1 compressor as it is hard wired into the vehicle and the Max air has just sat as backup or to pump up my tyres quicker if I am in a hurry. The same mob now has a twin compressor but not sure how good it is but it is physically bigger and would'nt fit where I would want it.

Anyway the points I am trying to make are :

1. you are probably unlucky that it failed

2. always put a ground sheet/carboard etc on the ground to sit it on

3. They are cheap enough so buy a new one and keep on hand as a spare because I thing you will have problems again if you have file something by hand that has to spin around quickly and has a sloppy bearing

AnswerID: 280049

Follow Up By: Member - Luke (SA) - Sunday, Jan 06, 2008 at 10:47

Sunday, Jan 06, 2008 at 10:47
Mine is a double pumper.

I bought mine for $180- nearly three years ago at a 4wd show here in Adelaide. I have it working now but like you have said I don't think it will last too much longer.

I let all the air out of one of my camper trailer tyres and pumped it back up. It took 6 1/2 minutes to pump back up to 38psi which I thought was normal. For how long though???

Cheers Luke
FollowupID: 544269

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