M923A2 won’t build air

[Thomas_G]

Have a 923A2 with the 8.3 Cummins.
new air dryer and brake chamber diaphrams installed.
will build up to 60 psi then pretty much stay there.
previously would only get 35-40 psi before diaphrams replaced
anyone have this issue before?

 

[simp5782]

Have a 923A2 with the 8.3 Cummins.
new air dryer and brake chamber diaphrams installed.
will build up to 60 psi then pretty much stay there.
previously would only get 35-40 psi before diaphrams replaced
anyone have this issue before?

What is the air pressure directly out of the compressor? If its wrapping the gauge around then try it at the inlet line at the dryer.

 

[Thomas_G]

Hi Wes

it only builds up to 60 and may get up to 80. I put a new air dryer and brake chamber diaphrams in both rears only made a small improvement. This is my first 923

 

[simp5782]

Hi Wes

it only builds up to 60 and may get up to 80. I put a new air dryer and brake chamber diaphrams in both rears only made a small improvement. This is my first 923

You have to measure it at the compressor output. Then at the dryer input. Not off the gauges on the dash. Rig up a gauge with a fitting so you can walk thru the system to find out where its losing pressure

 

[winterton1]

I am also have an air dryer problem the air dryer was leaking air out the blow out hole. tried to free up the valve with a screw driver still wouldnt seat. took the dryer off and was was pretty far past a rebuild so in put a new dryer unit. worked for the first few miles then the air leak came back and i cant get it the seat closed! any ideas??