ARB compressor stopped pumping air

[Struth]

Story
Enjoying the Gembrook state forest last Sunday until I tried to air up my 33x10's from 10psi. managed to get one up to 26 but the next just sat at 10 no matter how long I ran the compressor. gotta love limping to the servo NOT!

Setup
The 10 year old ARB onboard Compressor was fitted at the same time as an Air locker for the D44 and a hi pressure air line between the outlet and the front bar with a fixed coupling so I can air up without needing to lift the bonnet.





Issues
I was hoping it was an o-ring as I have needed to replace one before, other then that I haven't had any issues with leaks until recently - the compressor switches on occasionally when the pressure drops from a slow leak, I'm assuming last Sunday that leak got bigger as I was only able to blow up one tyre, it still pumps air but not under pressure; sounds like just a leak somewhere...

Diagnosis
Whenever need to find a leak with an air line I reach for the soapy water spray bottle with great expectations but this time no joy! I can't find any bubbles in the lines or around the tank.

HELP!
Any ideas? Could the piston be worn out? Is there a reco kit? I prefer to fix then replace though after more then ten years of service it's probably time to bite the bullet and upgrade, limping to a servo for air is no fun.

Any advice on what ARB fit up for the combination locker/air up system might be appropriate.

Thanks in advance

[Billnick]

Sounds like my compressor (not ARB). Pulled it apart and found the non return valve had jumped out of its posi.

[Struth]

thanks for the reply haven't figured out whats wrong with it, where's the "non return valve" located on the ARB comp?

[rang0]

Have you tried to turn it on and soapy water every think? even disconnect all your pipe work to make sure its the compressor. It the compressor is fine it would be a good idea to get a big compressor hooked up so you can find the leak as the compressor will not blow hard enough. Some time with the air hose connection they rust on the valve and get sticky. I've had on the rusted up on the inside and wasn't seating right when the hose was disconnected. If you run the new arb lockers get a high pressure switch because when you have a slow leak the gear the slides in (locks) comes out under low pressure and instead off having the full spline contact it will only be half of the spline making contact. It happen 3 times on my gq even with the high air pressure. I like the thought of electronic or mechanical lockers over air locks personally but that's not saying I wouldn't buy them again.

[rang0]

Just looked at your photos. There o rings inside the air fittings check them if the have cracked or perished.

[Struth]

G'day rang0

Yeah...

Originally Posted by rang0

Have you tried to turn it on and soapy water every think?.

Originally Posted by Struth

I reach for the soapy water spray bottle with great expectations but this time no joy! I can't find any bubbles in the lines or around the tank.

Originally Posted by rang0

disconnect all your pipe work to make sure its the compressor..

pipe to the bar (in picture) is good, no bubbles, haven't checked the locker air line, if it stops raining today I will try to isolate it

Originally Posted by rang0

It the compressor is fine it would be a good idea to get a big compressor hooked up so you can find the leak as the compressor will not blow hard enough.

that's an idea, thx

Originally Posted by rang0

Some time with the air hose connection they rust on the valve and get sticky. I've had on the rusted up on the inside and wasn't seating right when the hose was disconnected.

I keep it oiled & your right it does rust up a bit

I

Originally Posted by rang0

f you run the new arb lockers get a high pressure switch.

I wont run my locker if it's dropping below 100psi for that very reason, thx again, good advice

Originally Posted by rang0

I like the thought of electronic or mechanical lockers over air locks personally but that's not saying I wouldn't buy them again.

I feel inclined to agree...

I'll update this thread when I work what's up


-JH

[Struth]

Originally Posted by rang0

check them if the have cracked or perished.

Did that yesterday and it all looks good.