1850 cockshutt hydraulic control valve problem

rider666

New User
I have a 1850 Cockshutt. One double acting hydraulic control valve works in one direction well. in the other direction it lifts a front end loader up about four feet and then stops moving. will push down and lift front of tractor off the ground like nothing. any thoughts on what internal part is causing this problem
 
Does the pump growl when it stops lifting? If so, it is low on oil. Loader cylinders are long and displace a
lot of oil. If the loader was added the tank might be too small.
 
(quoted from post at 13:57:39 09/06/15) Does the pump growl when it stops lifting? If so, it is low on oil. Loader cylinders are long and displace a
lot of oil. If the loader was added the tank might be too small.
No growling. Lots of fluid. System seems to be locking up. Will lift again if pressure is released by relief valves for disconnecting hydraulic lines
 
Why don't you post this on the Oliver/Cockshutt forum. There were three different types of hydraulic systems on those,we'll need to know which one you have.
 
(quoted from post at 18:48:00 09/06/15) Why don't you post this on the Oliver/Cockshutt forum. There were three different types of hydraulic systems on those,we'll need to know which one you have.
it has 3 external double acting control valves the other two work perfect in both directions The malfunctioning valve acts the same no matter what it is operating good one way locks up in other direction
 
Hi I'm Not quite following your relief valve release description.
Could the problem be one of the quick release hose couplings if fitted is not allowing oil flow back through a line and it is stopping the cylinder
moving. Oil needs to move to and from both sides of the cylinders. if the oil stops one way it won't move as it dead heads the cylinder( locks it up) it sounds like thats the pressure you are relasing.
maybe try swapping those 2 block couplers to another line/ spool control slice and see if the problem moves to.

The couplings can wear out over time and start messing the free and pressure side flows around. There have been a few guys round the forums change
expensive components mess around for 3 weeks then find it was the $70 of quick release couplers worn or with miss matched center valves with pioneer
style ends.
Might not be your problem but worth a shot trying swapping couplers over and see what happens.
Regards Robert
 
(quoted from post at 11:33:59 09/06/15) I have a 1850 Cockshutt. One double acting hydraulic control valve works in one direction well. in the other direction it lifts a front end loader up about four feet and then stops moving. will push down and lift front of tractor off the ground like nothing. any thoughts on what internal part is causing this problem
I believe there is a poppet seat,a ball and a cross pin trough the seat (in the bottom of the valve block).
The pin may have broken, causing the ball to block the bore.
Anyway that was the case with one of my remotes(similar to your problem) in my 1855
 
This may be a stupid question but is the loader well
greased? Pins can bind up part way and act as you
describe. Rare but possible.
 
(quoted from post at 22:41:22 09/07/15) Hi I'm Not quite following your relief valve release description.
Could the problem be one of the quick release hose couplings if fitted is not allowing oil flow back through a line and it is stopping the cylinder
moving. Oil needs to move to and from both sides of the cylinders. if the oil stops one way it won't move as it dead heads the cylinder( locks it up) it sounds like thats the pressure you are relasing.
maybe try swapping those 2 block couplers to another line/ spool control slice and see if the problem moves to.

The couplings can wear out over time and start messing the free and pressure side flows around. There have been a few guys round the forums change
expensive components mess around for 3 weeks then find it was the $70 of quick release couplers worn or with miss matched center valves with pioneer
style ends.
Might not be your problem but worth a shot trying swapping couplers over and see what happens.
Regards Robert

Tried different hydraulic couplers and no change.
 

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