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03-28-2013, 02:37 PM
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#1
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Senior Member
Join Date: Dec 2007
Location: Armenia, Wisconsin
Posts: 278
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Air Pressure Slow to Pick up.
Hi all,
Fifty three degrees here today, started the coach ran for a while would not pick up air pressure past thirty pounds. Last month was slow but pickup air to 120+.
THANK YOU
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1983 Newell Coach
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03-28-2013, 02:45 PM
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#2
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Senior Member
Join Date: May 2012
Location: Boise Idaho
Posts: 719
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There's a pressure relief valve on the bottom of your air dryer, located drivers side engine compartment. With the motor running, stick your hand under it to see if it's stuck partially open. If so you can tap on it with a wrench or small hammer to see if it closes. If it's oily it probably means that your compressor is going bad.
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Jon & Chris Everton
1986 40' Dog House #86
0 hp 8V92 Allison HT740
Soon to be 500hp ISM with ZF 6 Speed
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03-28-2013, 02:55 PM
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#3
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Senior Member
Join Date: Dec 2007
Location: Armenia, Wisconsin
Posts: 278
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Jon,
Your quick to respond I'll inspect it now. Let's hope for an easy fix.
phil
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1983 Newell Coach
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03-28-2013, 04:17 PM
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#4
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Senior Member
Join Date: Sep 2006
Location: Sugarland, TX or Salida,CO
Posts: 1,867
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I agree with Jon, Try that first and let us know whatcha find.
Sean
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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03-28-2013, 05:23 PM
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#5
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Senior Member
Join Date: Sep 2008
Location: Thibodaux, LA
Posts: 1,221
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Someone recently had a similar situation. There is a controller on the engine air compressor that is a common $15 part (any truck place should have it) that controls compressor cycling. Is air exhausting from around your air compressor when it tries to build pressure?
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03-29-2013, 01:09 PM
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#6
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Senior Member
Join Date: May 2008
Location: Just North of Detroit, a surprizingly great city
Posts: 380
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Hey GringoPhil: sorry to hear of your troubles. Either the compressor isn't putting out enough air or you've got a large leak. If once pressure was previously built up - though slowly- it didn't drop precipitously once the compressor unloaded (turned off) then you don't have a leak large enough to cause your symptoms. Another way to test this is to hook up shop air to the system, charge it up, shut the supply off and see how fast the pressure drops.
If you find that a leak is not the problem then I would be exploring the compressor and its governor. Bendix has provided a great troubleshooting guide for this in the following PDF file:
http://www.bendix.com/media/document...otingguide.pdf
This guide has some relatively simple test procedures for determining that the compressor is or isn't working OK. If it is OK then the governor is gone to .... wherever it is that governors go when they are shot.
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Jon and Alie Kabbe
Started with 77 Coach
Now have 39' 93 coach
2007 civic toad
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03-29-2013, 08:40 PM
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#7
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Senior Member
Join Date: May 2012
Location: Boise Idaho
Posts: 719
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GringoPhil, I made an assumption that your compressor is direct drive, your symptoms are also what would happen if your belt was loose when it's belt driven.
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Jon & Chris Everton
1986 40' Dog House #86
0 hp 8V92 Allison HT740
Soon to be 500hp ISM with ZF 6 Speed
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