John Deere 1640
- Thread starter Elite605
- Start date
Tx Jim
New Member
Please explain what you're referring to when you state "The jack raises but I have to move the steering wheel or the tipping lever."?? JD utility tractors of that era didn't come with a "jack" & what is a tipping lever?
Tx Jim
New Member
What type valve is utilized to control the jack(tractor selective control or independent)? Do you know which style steering valve your tractor has?(old style or hydrostatic)
old style steering valve https://partscatalog.deere.com/jdrc/sidebyside/equipment/79860/referrer/navigation/pgId/2333475
hydrostatic steering valve
old style steering valve https://partscatalog.deere.com/jdrc/sidebyside/equipment/79860/referrer/navigation/pgId/2333475
hydrostatic steering valve
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I have something like this . https://partscatalog.deere.com/jdrc/sidebyside/equipment/83687/referrer/navigation/pgId/391568301
DLTTrekkers
Veteran Member
Remove priority valve and strip and clean it
Tx Jim
New Member
DLTTrekkers
If tipping valve(I'm guessing op's referring to fel bucket?) operates then please explain if my guess is correct how priority valve could be at fault? I think steering valve might be by passing internally.
Thanks, Jim
If tipping valve(I'm guessing op's referring to fel bucket?) operates then please explain if my guess is correct how priority valve could be at fault? I think steering valve might be by passing internally.
Thanks, Jim
DLTTrekkers
Veteran Member
See the hydraulic sisteme as 2 seperate sistemes.
An open sisteme from the screenefilter up to just before the main hydraulic pump.
From there it changes to a close senter sisteme. All highpresure work to be done is close senter.( like your water sisteme in your home) You open a tap and the water flows.
When turning your steering the mainpump starts to work your steering. ( stop your steering and you close that tap.)
You wil not be able to turn your steering fast enough and for that moment your jacks starts to work !.
Stop the steering and the mainpump gose on standby.
If the standby pressure is to low it will efect aal other function downstreen.
A good starting point will by to test the highpressure just before the T-piece that gose to the steering.
Remember (close the tap) no flow but pressure(2250psi) If that is ok then add the steering and check the pressure again. If the pressure drops you have a problem in the steering. If not then disconnect the external hidraulics and block in with a stopplug.
Start and check if the rockshaft is working.( Add a 3point imliment and work with it)
If it is working fine...ok.
If not you will have to repair it.
Come back and we will help you !
An open sisteme from the screenefilter up to just before the main hydraulic pump.
From there it changes to a close senter sisteme. All highpresure work to be done is close senter.( like your water sisteme in your home) You open a tap and the water flows.
When turning your steering the mainpump starts to work your steering. ( stop your steering and you close that tap.)
You wil not be able to turn your steering fast enough and for that moment your jacks starts to work !.
Stop the steering and the mainpump gose on standby.
If the standby pressure is to low it will efect aal other function downstreen.
A good starting point will by to test the highpressure just before the T-piece that gose to the steering.
Remember (close the tap) no flow but pressure(2250psi) If that is ok then add the steering and check the pressure again. If the pressure drops you have a problem in the steering. If not then disconnect the external hidraulics and block in with a stopplug.
Start and check if the rockshaft is working.( Add a 3point imliment and work with it)
If it is working fine...ok.
If not you will have to repair it.
Come back and we will help you !
DLTTrekkers
Veteran Member
With the little info we are all playing a guessing game