Medium and Heavy Trucks

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Have a 91 kw. Had to replace the air dryer. The air dryer
Have a 91 kw. Had to replace the air dryer. The air dryer will not purge and i am building in excess of 170 lbs of air pressure. … read more
Joe Green
Joe Green
66 satisfied customers
I have a 2015 KW T800 that was not building secondary air.
I have a 2015 KW T800 that was not building secondary air. changed the AD filter and governor. Now both the pri/sec air build to about 95 psi and stops. The other thing I noticed is that the air build… read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
51 satisfied customers
2018 Mack mru613 with mo7 engine. Turbo cut off valve on air
2018 Mack mru613 with mo7 engine. Turbo cut off valve on air dryer has failed twice in the last week. What is causing this? What is fix?… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,301 satisfied customers
My air compressor on 2015 Freightliner DD 13 not wanting to
My air compressor on 2015 Freightliner DD 13 not wanting to build air. will build slowly at 1500 rpm. Replaced air cartridge on dryer and the purge valve a few weeks ago because the purge valve was po… read more
Expert
Expert
10,510 satisfied customers
The air pressure is not building up at all. If I am hearing
The air pressure is not building up at all. If I am hearing yhe constant "tsk,tsk,tsk" does that mean that the problem may lie with the air dryer?… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,301 satisfied customers
Can I ask you a question about an air dryer in a 2013
Can I ask you a question about an air dryer in a 2013 Prostar international with a maxxforce13… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
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
I have a mack mru613 with an MP7, this unit has been having
I have a mack mru613 with an MP7, this unit has been having an issue with Aftertreatment fuel pressure 1 circuit/range performance. the customer has already replaced the sensor once. last time it was … read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,301 satisfied customers
Freightliner Columbia 2010 with Detroit Series 60 Air drier
Freightliner Columbia 2010 with Detroit Series 60 Air drier assembly and air governor have both been replaced twice. Both primary and secondary air gauges going to 150 psi Air from air drier purges fo… read more
Mike Mcmillan
Mike Mcmillan
Shop Foreman/Triage Tech
Associates
6,301 satisfied customers
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
Shop Foreman/Triage Tech
Associates
6,301 satisfied customers
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
Shop Foreman/Triage Tech
Associates
6,301 satisfied customers
2010 cascadia.. air compressor pumping good air .. alot less
2010 cascadia.. air compressor pumping good air .. alot less coming out of drier when not bolted to tank. too fittings off other end no air going throug tank.. i think...there should be coming fron on… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
We got a 2003 mack ch613 that tje dealer just put a new
We got a 2003 mack ch613 that tje dealer just put a new turbo on and it wont build over 22 psi of boost has no loos or busted hoses or pipes that we can tell been over it with soap and water thanx in … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,756 satisfied customers
My '07 Kenworth W900 will not build air pressure. I had a similar
My '07 Kenworth W900 will not build air pressure. I had a similar problem last fall and replaced the air dryer with a reman air dryer (Bendix AD-IS) and new governor. That fixed the problem. A few wee… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have a 1990 Country Coach motorhome on a Gillig chassis.
I have a 1990 Country Coach motorhome on a Gillig chassis. On my last trip a few weeks ago, I kept hearing purging of air below the driver's side. There are two needles on the dash instrument panel-a … read more
Expert
Expert
10,510 satisfied customers
My air system was frozen due to someone bypassing my air dryer
My air system was frozen due to someone bypassing my air dryer I put new air dry in yesterday and connected everything back up but now compressor has no pressure. I can hold my finger over outlet and … read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
I have a problem with a Kenworth T600, Its a 1997 tractor trailer
I have a problem with a Kenworth T600, Its a 1997 tractor trailer truck. The compressor does not go into unloaded stage long enough to cool and the air dryer unloads about every 30 seconds. The compre… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,756 satisfied customers
I VE GOT A 2000 PETERBILT 379 TRUCK IS NOT BUILDING AIR PRESSURE
I VE GOT A 2000 PETERBILT 379 TRUCK IS NOT BUILDING AIR PRESSURE IT WAS BUILDING PRESSURE THEN STOPPED. IT WOULD BUILD TO THIRTY SOMETIMES IT WOULDNT BUILD AT ALL. YOU WOULD HAVE TO WAIT CUT THE TRUCK… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

6,062 satisfied customers

Owner at DJ Wilson

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Wayne

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worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

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ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

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cumminsdr

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Chris (aka-Moose)

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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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