Medium and Heavy Trucks

Have truck repair questions? Ask an Expert

Ask an Expert,
Get an Answer ASAP!

I am looking for the formula to calibrate a kenworth 904…

Customer Question
Hi i am looking...

Hi i am looking for the formula to calibrate a kenworth 904 speedo. we have just put in a new speedo and it requires calibrating. i had a formula based on 11r22.5 tyres and*****ranger all i had to do was put in the diff ratio an caculate. thanks

Mechanic's Assistant: What is the complete model and serial number of your machine?

I would have to look it up i dont have it in front of me right now i will have to go back and look it up

Mechanic's Assistant: Anything else you want the equipment mechanic to know before I connect you?

No thanks

Submitted: 11 months ago.Category: Medium and Heavy Trucks
Show More
Show Less
Ask Your Own Medium and Heavy Trucks Question
Answered in 5 hours by:
9/11/2017
Technician: go-west.., Technician replied 11 months ago
go-west..
go-west.., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,266
Experience: Technican with 20 years experience focused on engines and electrical.
Verified
Good morning
Is this a ameteck speedo?
Ask Your Own Medium and Heavy Trucks Question
Customer reply replied 11 months ago
Hi, sorry no. Vdo speedo, cummins gen 2*****ranger, meritor diffs and 11r22.5 tires. Changed the speedo cos previous digital reedout went blank. I know how to program it but just need the formula to work out the ppkm. Thanks
Technician: go-west.., Technician replied 11 months ago
Sorry for the delay
We need your rear end ratio first
The formula is
Wheel revs x rear end ratio x 16 /120 = wheel revs per kilometreTo get wheel revs,
Measure the diameter of the tire and divide by 20168 that will give you warm.
Put all the numbers together that's your ppmkm.
Let me know if you have any other questions.
Ask Your Own Medium and Heavy Trucks Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask go-west.. Your Own Question
go-west..
go-west..
go-west.., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,266
1,266 Satisfied Customers
Experience: Technican with 20 years experience focused on engines and electrical.

go-west.. is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

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

2,803 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

4,530 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

2,892 satisfied customers

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

Jeremy

Jeremy

Certified Truck/Bus Technician

2,243 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician

cumminsdr

cumminsdr

Mechanic

1,351 satisfied customers

All types of Cummins applications

Curtis B.

Curtis B.

Technician

991 satisfied customers

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

dieseldan55

dieseldan55

Contractor

74 satisfied customers

Road Service mechanic for Volvo Construction.

< Previous | Next >

Related Medium and Heavy Trucks Questions
I have a 04 Freightliner Columbia with a Detroit Diesel 60
Hi, I have a 04 Freightliner Columbia with a Detroit Diesel 60 series motor and the speedo is off by about 5mph and I was wandering if there's something I can do to recalibrate the speedo or do I have… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,803 satisfied customers
Am replaceing the Speedo head in the dash on our Fire
am replaceing the Speedo head in the dash on our Fire Engine.I have lost the dip switch formula insert that came with the speedo. Have FL112 Vin H933293 with rear ratio of 1/4.89 with new goodyear 315… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,803 satisfied customers
I have a 2006 freightliner columbia cl120, vin nr.
Hi, I have a 2006 freightliner columbia cl120 , vin nr. 1FUJA6CGX6LX00217 I need to know the ratio, wheel base and other specifications of this truck. Can you help me with this?… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 satisfied customers
I have 2008 Volvo vnl670 with Cummins ISX. Recently when
Hi I have 2008 Volvo vnl670 with Cummins ISX. Recently when driving engine check fault show up MID 128 SID 146 FMI 13 It says out of calibration. I notice lack of power when accelerating and heavy smo… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,803 satisfied customers
I Have a 2007 fendt 312 vario, and i have been trying to get
I Have a 2007 fendt 312 vario, and i have been trying to get the transfer case … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,243 satisfied customers
I saw the answer about the under powered Mack engines CH635
I saw the answer about the under powered Mack engines CH635 330-350 hp. I also have two of these trucks. I have deleted the egr coolers but did not help much. Presently these trucks have rear differen… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,803 satisfied customers
My 1985 freightliner COE has a 400 mechanical cummins with a
hello. my 1985 freightliner COE has a 400 mechanical cummins with a 15 direct gearbox, 22.5 tires with a 40 inch height and a rear ratio of 3:55. Where do i set the eight little switches on the speedo… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,803 satisfied customers
I have a 2004 Mit Fuso FG, manual 5 speed. Does a high speed
I have a 2004 Mit Fuso FG, manual 5 speed. Does a high speed differentail exist? I am looking to gain top end speed. Would a new different differential gear ratio do this without changing the tranny?… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,803 satisfied customers
I have a 2005 peterbilt with an older 3406e engine. 2 wire
I have a 2005 peterbilt with an older 3406e engine. 2 wire speed sensor. Everything worked perfectly until I changed my ecm. No speedometer doesn't work correctly. Shows wrong speed and when it gets p… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
Cat Man, we just replaced the both differentials with a different
Cat Man, we just replaced the both differentials with a different ratio does anything on the engine side need to be calibrated? has a KCB80228… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
How can i change how much the odometer shows that i drive.
How can i change how much the odometer shows that i drive. Ive got Cummins Insite. The truck shows 6 miles per hour slower at 50 MPH… read more
Travis A. Wells
Travis A. Wells
Truck Mechanic
Associates of Applied Science
4 satisfied customers
if I have a broken axle can I remove the broken section that
if I have a broken axle can I remove the broken section that engages the diff. bolt it back up to seal the axle. then lock my power divider and finish the haul until repair can be made.… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 satisfied customers
I need a detailed description how to wire my speedo and rpm
I need a detailed description how to wire my speedo and rpm gauge on my 2000 Volvo heavy truck it is a WG64 model and I have taken out the 7 liter engine and replaced it with a 300 big cam cummins tha… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
2,892 satisfied customers
Just bought an 06 Freightliner Columbia Detroit S60 with a
Just bought an '06 Freightliner Columbia Detroit S60 with a gear ratio of 3.21. I am finding out that is not a good GR for good MPG. At 65MPH rpm is 1765. If i switch to a 3.55 or 3.58 GR, will i impr… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,803 satisfied customers
catman I just rebuilt a 6nz and it is running real well too
catman I just rebuilt a 6nz and it is running real well too well. Its building almost 45 psi of boost so I want put a generic code in for the injectors. Whats a generic code? Also I have to set the sp… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,530 satisfied customers
I found this post from 2010 about setting the switches on a
I found this post from 2010 about setting the switches on a W900 speedometer. I have a 2000 W900 that had an after market speed o. had to replace it. Switches were all wrong for the new speedometer. I… read more
Toby
Toby
Vocational, Technical or Trade Scho
107 satisfied customers
I am in need of the dip switch settings for the dash cluster.
I am in need of the dip switch settings for the dash cluster. VIN is 5TH311322. This is a 10-95 IHC 4900.… read more
Andy3221
Andy3221
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
Hi there..I have a 1998 Kenworth T800 which had a 460hp N14
Hi there..I have a 1998 Kenworth T800 which had a 460hp N14 celect plus in it. We recently had a new cummins reman turnkey engine installed. Came advertised as a 525 hp with a new ECM already on it. T… read more
cumminsdr
cumminsdr
Mechanic
High School or GED
1,351 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.

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