Medium and Heavy Trucks

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Related Medium and Heavy Trucks Questions
My 2001 GMC t6500 has an automatic transmission that drops
Hey Steve, my 2001 GMC t6500 has an automatic transmission that drops down into a low gear if I push it too hard. The transmission fluid is full, so I'm not sure what to look at next. … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
391 satisfied customers
I'm working on a 2003 gmc Topkick with a Caterpillar 3126,
I'm working on a 2003 gmc Topkick with a Caterpillar 3126, my question is, does the fan hub assembly just unbolt and pull?… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
4,737 satisfied customers
I have a Chevy C7500 with a Cat 3126. Tachometer only works
I have a Chevy C7500 with a Cat 3126. Tachometer only works when cranking over the engine. The oil pressure gauge is also pegged out at 100 psi when you turn on the key. Do I have a bad gauge cluster?… read more
AaronF721
AaronF721
Lead Technician
Diesel Technology
4 satisfied customers
How do you replace a fuel pressure regulator on a 2000
How do you replace a fuel pressure regulator on a 2000 Kenworth T300 with a Cat 3126? It is in the rear of the cylinder head and not much room to get to it. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
I have 2000 FL 70 with a cat 3126 and Eaton autoshift tCNNhe
Hello I have 2000 FL 70 with a cat 3126 and Eaton autoshift tCNNhe truck only has 60,000 miles I bought the truck a year ago and have problems with the transmission. Had it towed into Freightliner and… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
391 satisfied customers
I have a 2001 GMC T7500. The blower motor does not operate.
I have a 2001 GMC T7500. The blower motor does not operate. Nothing operates from the climate controller. I ran 12V directly to the motor and it works. But I would prefer to control it from the contro… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
391 satisfied customers
I have a 164-2 and 70-5 code in a Caterpillar 3126. 2000
Hello, i have a 164-2 and 70-5 code in a Caterpillar 3126 … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
I have hard time starting my truck GMC 2001 w/cat 3126. 2001
I have hard time starting my truck GMC 2001 w/cat 3126 … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
I have a 2000 gmc c7500. 3126 cat 2000 gmc. I am broke down
i am broke down in NM driving a long acted like some one just shut the key off, now be for this i had a charging problem over charged cooked the battery's and blow the low beams out also blow the radio, now i put 2 new battery's in the truck and a new alternator start right up drive it from little rock to NM boarder and it just shut off do you know of a ecm fuse or fuse-able link might be in this circuit and location thanks *****: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts.… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
14,579 satisfied customers
How many miles does a 3126 cat engine get up to before they
How many miles does a 3126 cat engine get up to before they tap out on average? Looking at a sweet deal on a c6500 but the miles are pretty high it has no blowby, no leaks it runs good. But I still pl… read more
Keiphun Sowell
Keiphun Sowell
AutoDiesel Technology
977 satisfied customers
I have a 2001 GMC 8500 dump that had the wires pulled out of
I have a 2001 GMC 8500 dump that had the wires pulled out of the front solenoid, and I'm assuming shorted together because after I reattached the wires the bed won't dump and I don't hear the hydrauli… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
391 satisfied customers
I have a 3126 in o2 FL70 dump truck 7 yarder. Lately I have
I have a 3126 in o2 FL70 dump truck 7 yarder. Lately I have to crank the engine longer for it to start like 15 to 25 seconds. Battery ate good and I plug it in on over night for it to trickle charge. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
Got a 2001 gmc topkick with 3126 in it. Was running fine.
Got a 2001 gmc topkick with 3126 in it. Was running fine. Went to start long cranking. Had already run into bad inj actuation sensor couple weeks back. Fixed that. I unplugged the sensor again to test… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
Looking at purchasing a 2000 Freightliner FL60 sport chassis
Looking at purchasing a 2000 Freightliner FL60 sport chassis crew cab with the 300/850 CAT 3126 and Alison set up to pull an RV 5th wheel. Its spent its life as a AAA sprint race car hauler and has 20… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
I am researching the reliability of a CAT 3126 engine. I
I am researching the reliability of a CAT 3126 engine. … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
I am working on a 1998 Gmc T7500 Truck with a V8-6.0L
I am working on a 1998 Gmc T7500 Truck with a V8-6.0L engine. Cylinder heads were removed together with pistons.I need the reassembly torque specifications for the heads and connecting rods. Thanks fo… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,571 satisfied customers
I am looking at a 1999 c6500 GMC truck with a CAT 3126 engine
I am looking at a 1999 c6500 GMC truck with a CAT 3126 engine (SN 7a531378). Are there any known problems with this engine? Currently the engine has 86,000 miles.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
I have a 2004 f-650, it has a caterpillar Serial number HEP12329,
I have a 2004 f-650, it has a caterpillar Serial number HEP12329, model number 3216, Can i interchange this with a model c7 serial number fmm14900 caterpillar engine? If so, what parts interchanges ha… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,234 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

4,737 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

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5,234 satisfied customers

I am ASE Master Truck Certified.

Wayne

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

cumminsdr

cumminsdr

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All types of Cummins applications

Curtis B.

Curtis B.

Technician

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

Chris (aka-Moose)

Chris (aka-Moose)

Technician

353 satisfied customers

24 years of experience diagnosing & repairing

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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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