Mog losing air/air not building up

[combined tree services]

sorry steve did you say 50k lmao

[Stephen Blair]

50k it is, but i want the low loader it comes on at that price lol

[Dean Lofthouse]

You need to build the air up without the engine running, like has been suggested, with a big compressor and fault find that way, you cant hear air leaks with an engine pounding away

 

It does sound like the pressure relief valve

[Stephen Blair]

mine was completely choked, it took the mechanic about an hour to clean it out with fuel, the compressor and the end of a 4mm file.

[Dean Lofthouse]

It should be quite simple to follow from the comressor and eliminate one item at a time

[Stephen Blair]

haha, have you looked under the hood of a mog before deano haha, you cant fit a fiver down the side of all the pipes, hoses and a huge engine lol to get to one thing you have to undo everything else

[combined tree services]

haha, have you looked under the hood of a mog before deano haha, you cant fit a fiver down the side of all the pipes, hoses and a huge engine lol to get to one thing you have to undo everything else

 

i will have a look at the pressure relief valve tomorrow morning and see what happens , will also charge the system from the workshop compressor . your most certainlyu right about there not being much room and having to take several thing off to get to what you need to fix , like an injector pip as we found out today lol .

[Mike Hill]

Tilt the deck,then tilt the cab.You will have heaps of room to do what you need to do.

 

Also if I get my Arse into gear and send you the pages of the workshop manual as I said I would that would help alot too.I have told Josh to remind me.

 

Its his fault if I don't.

[Dean Lofthouse]

haha, have you looked under the hood of a mog before deano haha, you cant fit a fiver down the side of all the pipes, hoses and a huge engine lol to get to one thing you have to undo everything else

 

I have stevie, but 20 years ago mate

 

The answer is fault finding in silence, build up the air with a compressor air line and listen for leaks, it's obviously escaping to atmosphere so just needs to find out where and follow back

[b101uk]

If you are relatively unfamiliar with airbrake systems you would be better of contacting a local mobile HGV mechanic, mog airbrake systems are really no different to any other truck air-over brake system which a mobile HGV mechanic will be familiar with.

 

You can easily waste hours looking at something you are unfamiliar with and waste lots on money aimlessly replacing parts that are not needed nor fix the problem.

 

As said by others use a workshop compressor (>150L tank preferably), set the pressure on the workshop compressor to 110psig and charge its tank, undo the pipe from the mog compressor to the unloader valve at the rear of the unloader valve and get some pipe fittings to fit an airline QR coupling on the unloader valve, then when the workshop compressor is charged plug its airline into the QR coupling on the unloader valve, air will rush from the workshop compressor tank to the mog air system trying to charge the mog system as the mog compressor would try to do, repeat the above until you have found the leak, as the workshop compressor is set to 105psig the unloader valve on the mog should not trigger as that should happen at 8.1bar/117.5psig which can be tested by rising the workshop compressor operating pressure above 8.1bar/117.5psig.