Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Connect one-on-one with {0} who will answer your question

Related Medium and Heavy Trucks Questions
What would make air pressure back feed to the foot peddle
What would make air pressure back feed to the foot peddle and jonny bar at 120 psi on a kenworth. If you pull jonny bar and press on brakes air leak stops… read more
Joe Green
Joe Green
14 satisfied customers
I Have A 3406e ISN 5EK90526 Lost A Computer Last Week
Good Morning Sir I Have A 3406e ISN 5EK90526 Lost A Computer Last Week Ordered One From Ohio Cat With A Basic Program Could Not Retrieve Any Data From Old ECM Sent Truck To Cat For Programming Now Tru… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,293 satisfied customers
FOR THE CAT MAN, sir you you have full overhead valve
FOR THE CAT MAN, sir you you have full overhead valve procedure for CAT SER NO 5EK82295. Including jakes. Thank you sir… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,293 satisfied customers
1999 Kenworth T800 Red Trailer supply valve wont stay in
1999 Kenworth T800 Red Trailer supply valve wont stay in when i push it. It pushes right back out. New dash valve lines are not crossed. Checked all other valves it still happens. Disconnected Emergen… read more
BrentR718
BrentR718
13 satisfied customers
I jest installed a throttle valve on a kenworth vin is
I jest installed a throttle valve on a kenworth vin is 099345 I took pictures and color coded everything and when there is air pressure in the truck there is no brakes something is wrong but I dont kn… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
16,529 satisfied customers
I have a 1997 freightliner classic with a detroit 12.7. Why
I have a 1997 freightliner classic with a detroit 12.7. Why does the brake valve leak air whem I release trailer brakes?… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
532 satisfied customers
1997 freightliner classic. When botbtailing and braking i
1997 freightliner classic. When botbtailing and braking i have an air leak at rhe blue hose that connexts to the trailer can someone help me fix the problen?… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
16,529 satisfied customers
I'am working on a 1999 CAT 3406E in a freightliner truck,
Hi, I'am working on a 1999 CAT 3406E in a freightliner truck, the truck has been sitting for 4 months and now it will not start. I scanned the engine there are no active fault codes, I'm almost certai… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
5,454 satisfied customers
I have a 3406e cat and when I'm driving and get above 1500
I have a 3406e cat and when I'm driving and get above 1500 rpm it starts cutting out really bad … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
5,454 satisfied customers
Just put a cat motor in my classic and trying to find a
just put a cat motor in my classic and trying to find a diagram for the new wiring harness for the ecm … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,293 satisfied customers
2011 Freightliner Coronado no air at red glad hand when
2011 Freightliner Coronado no air at red glad hand when trailer valve is pushed in on dash. if red trailer valve is pushed in on dash and you step on brake pedal then air feed out of red glad hand but… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
5,454 satisfied customers
I have a 3406e cat motor that looses it's prime overnite.
i have a 3406e cat motor that looses it's prime overnite. when you start it in the morning it will start and die then you have to crank on it to get it started. we have changed hand priming pump plumb… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,293 satisfied customers
I have a 2000 Freightliner Classic XLR with a 3406E SN
I have a 2000 Freightliner Classic XLR with a 3406E SN 2WS29466. I have dash codes 21 and 8. Any ideas. Also derated … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,293 satisfied customers
I have 2007 Freightliner Classic. I am having a problem with
I have 2007 Freightliner Classic. I am having a problem with the brake lights staying on after an application. This ONLY happens when connected to a trailer?? Tractor is fine when bob tailing. I have … read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
16,529 satisfied customers
1996 western star ,fitted with black brake spring push pull
1996 western star ,fitted with black brake spring push pull valve ,red trailer supply valve , when you release park brakes , air starts releasing from back of park brake valve at dash , have replaced … read more
John Vieira
John Vieira
Heavy Duty Diesel Mechanic
63 satisfied customers
Need color code diagram of air lines on a freightliner 97 Vin 833212. Have changed all val
Need color code diagram of air lines on a freightliner 97 Vin 833212. Have changed all valves, air is back feeding though the system… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,747 satisfied customers
1999 Freightliner Classic XL with a Cat 3406E 550hp. I changed
1999 Freightliner Classic XL with a Cat 3406E 550hp. I changed the radiator, the water level sensor and the arnest that goes to it, the thermostat sensor at the back of the engine and I still have a h… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,293 satisfied customers
i have 1997 freightliner tractor when you push in the button
i have 1997 freightliner tractor when you push in the button to release the maxi brakes the center valve and the right side valve dump air and do not release the brakes at it's conveinence it some tim… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
16,529 satisfied customers
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.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Daniel Wilson

Daniel Wilson

5,454 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

5,293 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

16,529 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

2,747 satisfied customers

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

cumminsdr

cumminsdr

Mechanic

1,824 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

1,806 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

Chris (aka-Moose)

Chris (aka-Moose)

Technician

462 satisfied customers

24 years of experience diagnosing & repairing

< Previous | Next >

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.

Show MoreShow Less

Ask Your Question

x