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Curtis B.
Curtis B., Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 3551
Experience:  Technican turned service manager on multiple lines of equipment and rental equipment.
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Have a new to me Deere 4250 that when I bought it has a

Customer Question

Have a new to me John Deere 4250 that when I bought it has a brand new rad in it. Tractor is running hot by gauge so locked fan clutch up, checked thermostats and put new water pump on it. Still running hot under load at back of engine right at temperature sending unit. Under load with heat gun it reads 220 at sensor. Take load off, it cools down to 190 within a minute. Took thermostats out of it, because I was trying to finish beans and it did not make any difference. Any suggestions? It is not losing any coolant any where.
Submitted: 1 year ago.
Category: Agriculture and Farm Equipment
Expert:  Wayne replied 1 year ago.

Hi I'm Wayne

I will help you with this

1st off never remove thermostat , it runs hotter

except the old days of cars 1950"s

I know you said new to you , but I would check the timing

that will cause a over heat,

it is 6 cly JD engine

when did start happening

Customer: replied 1 year ago.
the tractor is new to me. I have no idea on the history. Yes, it is a 6 cly engine . How do you check the timing on a diesel? Your comment about running hotter without thermostats on this tractor is not true, because it did run cooler with thermostats pulled. I know from checking thermostats on stove they are accurate.
Expert:  Wayne replied 1 year ago.


checking timing on a diesel is sort of a big ordeal,

need to line up the timing marks on the 8 degree on the

damper or the flywheel, then if off twist the inj pump to start fuel drip

there are tools to do this ,

so your saying that it is normal with fan locked in