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I have John Deere 4320 diesel Hydrostatic When first started…

I have John Deere 4320...
I have John Deere 4320 diesel Hydrostatic When first started the engine surges and eventually smooths out after a minute or two. The colder it is , the longer the engine takes to smooth out. Also. once warmed up, whenever a load is put on the engine hydraulics, front loader, turning the tractor trough a sharp turn, the engine revs up and down. What type of problem am I looking at fuel or hydraulics or both? I already changed fuel filter after there was sediment in the diesel fuel in the past and changed hydraulic fluid and checked level, also the filer and screen, I did not changed the inline hydraulic filter located on the other side of the tractor.
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Answered in 13 minutes by:
1/5/2014
Mechanic: Curtis B., Technician replied 8 years ago
Curtis B.
Curtis B., Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 43,978
Experience: Technican turned service manager on multiple lines of equipment and rental equipment.
Verified

Curtis B. :

Is this t e 4 cylinder compact tractor or the older 4320 model with 6 cylinder engine? The newer 4 cylinder has aneroid valve that cancause surging problems.

Customer:

It's the newer 4 cylinder

Curtis B. :

RE52/RE521260PCDE01_UN27NOV05.gif
Full Size Image

Curtis B. :

Try removing the pin in the linkage to the valve and see how it runs.

Curtis B. :

I think you will find this is fuel not hydraulic problem.

Customer:

Where is the valve located and can it be cleaned or do you have to buy a new one?

Curtis B. :

Mounted on the side with the injection pump controls and is cleanable. I can't find picture showing the mounting!

Customer:

What is the function of the valve?

Curtis B. :

To regulate the fuel input.

Curtis B. :

For emission control!

Customer:

Thank you I will check.

Curtis B. :

ok

Customer:

Have a good day

Curtis B.
Curtis B., Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 43,978
Experience: Technican turned service manager on multiple lines of equipment and rental equipment.
Verified
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Curtis B.
Curtis B.
Curtis B., Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 43,978
43,978 Satisfied Customers
Experience: Technican turned service manager on multiple lines of equipment and rental equipment.

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