daverl3
lafayette,In
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Joined: 10/07/2005
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I developed a problem with my airbrakes last week. Perhaps someone out there can direct me to a resource for airbrakes on a freightliner chassis with a 270 Cummins. The problem occurs when first started. the air won't charge. The first time I still had enough air to release the brakes and as I was moving it to a better place to park, the compressor came on line and worked fine until I stopped for fuel. Again, I had enough air to release the brakes and get away from the pumps but this time it did not recharge as I moved it. the next day I charged the air from an outside source. The green needle came up but the orange one didn't move. I drove it about 1/4 mi with the 2nd compressor supplying the air when the onboard compressor again kicked in and the orange needle came up to match the green. the onboard compressor maintained charge for the rest of the trip. It is now sitting in my drive awaiting some attention before it goes anywhere else. I checked it this evening and sure enough, the onboard compressor is not charging. I'm assuming that there is a pressure switch that engages the compressor and that it must have picked up some contamination? Any ideas for information to guide my search and further my understanding?
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wolfe10
Texas
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Joined: 10/08/2000
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Since the air compressor CAN supply you with air, first two things I would look at is Governor.
Have you verified that you do not have an intermittent air leak-- like check valve in air dryer?
And until fixed, I would definitely NOT drive it.
Brett Wolfe
1993 Foretravel 36' U-240
Cat 3116, Allison 3060
Caterpillar RV Engine Owner's Club: www.catrvclub.org
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tom_kat
way upstate new york/lake george area
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Joined: 02/28/2005
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theres a governor on the compresser that regulates air pressure and reeds inside works like valves where air comes in and goes out,make sure you have no air leaks like drain valves on the tank,air dryer,also the maxi brake chamber diaphrams might have devolped a leak, with the maxi brakes off and on listen for air leaks at the chambers.
1985 Class A Holiday Rambler Imperial 33 +1979 Class C Holiday Rambler Statesman 1000 = 24 ft
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daverl3
lafayette,In
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Joined: 10/07/2005
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I have listened for leaks and found nothing. I know that there must some small leaks because the system losses pressure over night.
Where might I find a manual for the governor?
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cdc
New Braunfels,TX
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Joined: 02/01/2002
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When was the last time you had your Air Dryer rebuilt? You would be amazed the gunk that gets in the Air Dryer.
Corky, Gracie, and the Herd
HR Imperial DP
Jeep Liberty
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wolfe10
Texas
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Joined: 10/08/2000
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daverl3 wrote:Where might I find a manual for the governor?
Check with Freightliner for the Governor used on your chassis.
You may be able to locate it on the air compressor and find out as well.
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1fastdad
mo.
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Joined: 08/27/2007
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It's the air gov. They are normally located on the air compressor or near it. They are made of aluminum and the slide valve inside sticks. the are easy to replace if you can get to it. (2 1/4" bolts & air line)
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