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Related Medium and Heavy Trucks Questions
My mac truck just cut off suddenly on me yesterday i am
Good day, my mac truck just cut off suddenly on me yesterday i am wondering if it has a turn off switch fpr fuel tanks … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
11,582 satisfied customers
Number one cylinder missing put new injector pump and
number one cylinder missing put new injector pump and injector in still missing on one its a 1998 mack 400 hp … read more
james Roberts
james Roberts
Maintenance assistant
Vocational, Technical or Trade School
3 satisfied customers
I have 1998 mack truck R start and shutdown I change the ecm
I have 1998 mack truck R start and shutdown I change the ecm change the relays still does the same thing start up and shutdown in 3 seconds and the key switch lights stay on after I turn the key of I … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
11,582 satisfied customers
I can not find the fuel relay on my 99 f800. Its a 99 f800
i have determined there is no power to the lift pump or vp44 pump. i can supply power by back probing in, and the truck will start … read more
Joe
Joe
Service Technician
Associate Degree
832 satisfied customers
2009MACK GU813 STARTED yesterday and was running fine then
2009MACK GU813 STARTED yesterday and was running fine then after about 5 mins it just shut down tried to restart all lights on dash light up but starter does not crank I can hear relay clicking in das… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
419 satisfied customers
1998 rd688 mack truck, production date, what wire numbers on
1998 rd688 mack truck, production date, what wire numbers on the wiring connect to such as switches, etc. You gave a friend this link a couple years ago http://smrp-prod.macktruck.com/spub/defaut_ie2h… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
419 satisfied customers
X. 2003 mack RD688s e7 etech 350 engine. Will not start, it
2003 mack RD688s e7 etech 350 engine. Will not start, it only cranks. I have eliminated any problem from the fuel tanks. I have a line running from a separate fuel container. I've replaced the Crank sensor and the Engine speed sensor. still no luck … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
419 satisfied customers
We put a new long block on a 2004 AC Mack and now engine
We put a new long block on a 2004 AC Mack and now engine starts and runs fine for 30 sec but then dies. Restarts fine but same kill happens every time. Mack dealer tech came and with his laptop said n… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
11,582 satisfied customers
00 UD 2000 tow truck had a couple bad injectors and changed
00 UD 2000 tow truck had a couple bad injectors and changed injectors. Smoking really bad when idling with pto engaged. Started getting fuel in the oil then we rebuilt injection pump. Still smoking an… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
11,582 satisfied customers
I'm not sure if all of the these symptoms are related, but I
I'm not sure if all of the these symptoms are related, but I have a 2000 Mack RD688s that has the Electronic Malfunction Light & Parking Brake Light remain on with the ignition off and key out. I retr… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
11,582 satisfied customers
I have a 99 mack the came into my shop missing on cylinder
I have a 99 mack the came into my shop missing on cylinder number 5 after it warms up replaced injector and unit on that cylinder and is still the same thing will miss after it gets hot check the volt… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,740 satisfied customers
2006 international 7600 w cummins engine, stalled got towed
2006 international 7600 w cummins engine, stalled got towed in will only start with starting fluid. I need to know how the fuel gets pumped from tank to injection pump. there is a fuel cut off solenoi… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
Can anyone tell me exactly where the calibration number is
Can anyone tell me exactly where the calibration number is ***** a Mack injector or get me a diagram of its location?… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,740 satisfied customers
I HAAVE A FORD 555A W/ 3 CYL DIESEL ENGINE. IT HAS THE LUCAS
I HAAVE A FORD 555A W/ 3 CYL DIESEL ENGINE. IT HAS THE LUCAS INJECTION PUMP IT SAT FOR 3 MONTHS NOW CAN'T GET FUEL TO INJECORS, FILTERS AND LINES ARE GOOD, PUT A 5PSI ELECTRIC PUMP TO CHARGE INJECTOR … read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
I have a 1976 Mack R600 in my yard with a 300 hp Mack engine..
I have a 1976 Mack R600 in my yard with a 300 hp Mack engine.. Will start but has no throttle response. Runs at a very low idle until it dies. I changed fuel filters and open up the air cleaner.. Acts… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
4,023 satisfied customers
I have a comfort gaurd gen-set with the Kabota diesel engine.
I have a comfort gaurd gen-set with the Kabota diesel engine. I have replaced all fuel filters and checked all fuel lines to the injector pump. the transfer pump seems to be working fine but no pressu… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
Chevrolet c5500: 2005 C5500 Duramax/allision, brake light warning
2005 C5500 Duramax/allision, brake light warning light on. replaced brake switch and relay for electric pump on master cylinder, tested connections at brake relay, red input wire has no voltage, 30 am… read more
NavistarMaster
NavistarMaster
master diesel technician
Associate Degree
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Meet the Experts:

Daniel Wilson

Daniel Wilson

11,582 satisfied customers

Owner at DJ Wilson

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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

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Curtis B.

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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

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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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