New Holland T7 Air brake pressure

[Jimbo26]

Hello
I've a 2014 NH t7.235 and I can only get it to 6.68 bar( used to be 7.5barish). I've drained the air tank, the belt doesn't look to be slipping.
I was wondering if what to try next?

 

[forblue]

Might be compressor if you have no leak's anywhere, how many hour's, and do's it take longer to get to max pressure,what about prv do's it blow off......

 

[s~~t shoveller]

If it blows off at that pressure then you will find a small screw on the unloader somewhere you can adjust.if it's not unloading then as said,compressor problem or bad leak somewhere,get the fairy liquid water out in a window sprayer and go round pipes and fittings.leak check first thing in fact...!

 

[Jim7789]

Hi, have same tractor with the same issue. Builds to 96-98 psi and blows off. What's the correct pressure these should be at? Have a 6090 at 120psi roughly.

Also where can I find the adjuster screw on the unloader?

Thanks

 

[davidroberts30]

Adjuster screw on my mf was right in the middle on the top of the unloaded
Cant remember which way I turned it but only go a 1/4 turn at a time
I set mine to 7.8/8bar