Trying to identify the Model Caterpillar Dozer by the Serial Number

31Vxxxx is not a good number.
I think your misreading the 31V as actually being a 3Nxxxx which would designate the engine arrangement 4N7363 as either a 95J398-up (narrow gauge) or 96J4791-up (wide gauge) D5 model tractor in 1974.

[quote="Old Magnet"]31Vxxxx is not a good number.
I think your misreading the 31V as actually being a 3Nxxxx which would designate the engine arrangement 4N7363 as either a 95J398-up (narrow gauge) or 96J4791-up (wide gauge) D5 model tractor in 1974.[/quote]

Hi,
Thank you for the reply. What is the difference between narrow & wide gauge. With the serial number, how would I find out what model Dozer I have? Thank you again!

"Gauge" is the width of the tracks, measured center to center. For the D5, narrow is 60" and wide is 74".
3N49781 is the engine s/n
4N7363 is the engine arrangement
The first three characters in the tractor s/n designate the series (model)
followed by the build sequence number.
Yours is most likely a 96J model as the 95J is less common.

[quote="Old Magnet"]"Gauge" is the width of the tracks, measured center to center. For the D5, narrow is 60" and wide is 74".
3N49781 is the engine s/n
4N7363 is the engine arrangement
The first three characters in the tractor s/n designate the series (model)
followed by the build sequence number.
Yours is most likely a 96J model as the 95J is less common.[/quote]


Ok, I found the plate with the serial numbers

D5 96J 6030 8P5568
3306 3N49789 4N7363

Measured the track from center to center and its about 74". "Wide Gauge"

Thank you for your help!

My info shows 96J6030 to be a late 1977 model near end of production.
Would also explain the high engine s/n.