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Medium and Heavy Trucks

I am looking for the formula to calibrate a kenworth 904

Customer Question
Hi i am looking for...
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
JA: What is the complete model and serial number of your machine?
Customer: 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
JA: Anything else you want the equipment mechanic to know before I connect you?
Customer: no thanks
Submitted: 2 months ago.Category: Medium and Heavy Trucks
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Answered in 5 hours by:
9/11/2017
Technician: go-west.., Technician replied 2 months ago
go-west..
go-west.., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,243
Experience: Technican with 20 years experience focused on engines and electrical.
Verified
Good morning
Is this a ameteck speedo?
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Customer reply replied 2 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 2 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.
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go-west..
go-west..
go-west.., Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,243
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Experience: Technican with 20 years experience focused on engines and electrical.

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