Medium and Heavy Trucks

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Related Medium and Heavy Trucks Questions
Where is the compressor for brakes located on a ISB .6.7
Where is the compressor for brakes located on a ISB .6.7 ...2008 model ? I'm wanting to replace the governor but can't find it … read more
james Roberts
james Roberts
Maintenance assistant
Vocational, Technical or Trade School
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2017 Volvo Semi Truck vin# ***************** I need the
2017 Volvo Semi Truck vin# ***** I need the location of the governor and the air dryer for the air compressor. Diagrams and or pictures will be really appreciated as I can't find them and not sure wha… read more
Bradey V
Bradey V
Certificate
Air builds to 80 psi then stops until i rev her up.
Air builds to 80 psi then stops until i rev her up … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
419 satisfied customers
I have a 93 Freightliner with a N14 Cummins motor and it
I have a 93 Freightliner with a N14 Cummins motor and it builds up too much air pressure. Governor opens to purge air dryer but doesn't seem to stop building pressure. Gets up to 200 or 230 PSI … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
419 satisfied customers
The purge valve in my air dryer goes off every 15 seconds
The purge valve in my air dryer goes off every 15 seconds I've already tried a lot of things… read more
Mike Mcmillan
Mike Mcmillan
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I have to yell hold my yellow parking brake valve in for at
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Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
2005 mack granite e7 wont build air. I installed new
2005 mack granite e7 wont build air. I installed new compressor, new govner, new air dryer. Will not build air at idle. Air lines are not kinked. No regulators going into tanks. … read more
Bradey V
Bradey V
Certificate
Air continuously leaking from the air dryer purge valve when
Air continuously leaking from the air dryer purge valve when compressor has unloaded, when the brake pedal is pressed it seems to stop. The air dryer, compressor and governor have been replaced ......… read more
Mike Mcmillan
Mike Mcmillan
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2009 international prostar purges air every 15 seconds
2009 international prostar purges air every 15 seconds already replaced governor, purge valve, air compressor head for the unloader valve and a new signal line from governor to the air compressor. Tes… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
419 satisfied customers
I have a air pressure problem on my Mac truck. It does not
I have a air pressure problem on my Mac truck. It does not generate enough air pressure on the primary side there is a 40 pound difference between the primary and secondary and when we work the truck … read more
Mike Mcmillan
Mike Mcmillan
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Requested you because you were so helpful with my volvo
Hey Steven, requested you because you were so helpful with my volvo problem with the EGP. Almost had to ask a really dumb question. I have just replaced the compressor on a 1979 Mack. I had never had … read more
Mike Mcmillan
Mike Mcmillan
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Truck Vin H72526 cummins ism air compressor part number..
Truck Vin H72526 cummins ism air compressor part number.. problem started a couple days ago..truck would build way too much pressure 140+ psi. I changed the governor out and it built and stayed perfec… read more
Mike Mcmillan
Mike Mcmillan
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419 satisfied customers
Air dryer started purging every minute and a half or so. No
Air dryer started purging every minute and a half or so. No loss in pressure. Swapped the air dryer and new governor. Started doing that I'm very cold weather. Still doing the same thing after new par… read more
Don
Don
fleet superintendent
Vocational, Technical or Trade Scho
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HAVE A 86' MC686FC MACK TRUCK. AIR BRAKE PRESSURE BUILDS
HAVE A 86' MC686FC MACK TRUCK. AIR BRAKE PRESSURE BUILDS ERRATICLY. BEFORE AIR PRESSURE STARTS TO BUILD AIR WILL SPUTTER 3 TIMES OUT OF SAFETY VALVE ON AIR DRYER,THEN AIR WILL BUILD.I HAVE REPLACED GO… read more
Don
Don
fleet superintendent
Vocational, Technical or Trade Scho
1,636 satisfied customers
1994 international 4900. we have been having severe problems
1994 international 4900. we have been having severe problems with the air freezing up on it and we want to bypass the air dryer. what are the ramifications of bypassing the unit? I would much rather s… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
I have an International 9900 with an AD-IP air dryer. The truck
I have an International 9900 with an AD-IP air dryer. The truck will not build air due to air constantly pumping out the purge valve. I have installed a new purge valve, new governor, new desiccant ca… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
I am working on a 1991 Pete with a L10. I just updated the
I am working on a 1991 Pete with a L10. I just updated the dryer with a AD-9 dryer. The dryer i took off i could not identify. It looked close and had 3 lines hooked up to it like the AD-9. The proble… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,740 satisfied customers
I have a 2007 Cummins ISM, and the air compressor will not
I have a 2007 Cummins ISM, and the air compressor will not unload. I have tried three new governors, and replaced the head (which houses the unloader valve). I checked the discharge line, and all actu… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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