D2 - 4U High Idle speed?

hello mattD2, 4U 5831 in my rack settings book (4u5010 to 4u6654)is engine full load rpm 1525 ,engine high idle is 1710 rpm ,rack setting .365 for governor group 5f195 ,governor spring no 5f1940 ,bruce oz
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Thanks for the comprehensive infomation Bruce Oz. I was a little lost in tracking this info down.

Thanks for your help and we will see how close we got "by ear"!

Bruce, The rack setting from the Cat rack setting book for that serial number I have from the dealer shows for the specs you give for RPMs and spring # is .285 setting not .365 and that calls for a 9F4113 nozzle and high idle at 1710 and with a 4F4236 nozzle the rack setting is .215 and 1680 high idle. Both settings use the 5F1940 gov. spring as you stated.The full load RPMs is the 1525 RPMs and gives 38 HP for both settings.

hello sj ,my books shows those setting for serial numbers-
4u1-4u5009 ,both sets of specs are issued 12/1956,without having the number of the governor group and spring number we really don't know which info he needs ,
i would go for 38hp instead of 42hp for the setting i posted ,

i looked in my second book and they give different rack setting too for just 4u/5u with no break down of serial numbers for 38hp

???? ,bruce oz

As usual we have variety😊 😊