7030 hyd stop working

All at once I lost the 3 point lift, PTO and remote controls while using the tractor. The tractor still moves and turns. It has a new torque limiter last spring. It did blow an o-ring on the vavle under the seat fix that and it work great and about 12 hour of use the PTO stop turning, 3 point would not lift and could get the remotes to work. After unhooking the pto from equipment the pto does turn What is the main cause of this? I am not sure if it is a pump or a vavle some where. Thanks for any help you may give.

Edited by dchilton - 21 Mar 2015 at 1:25pm

The pump may not be totally shot, however, they occasionally do fail.  You need an accurate gauge plumbed into the rear tee by the PTO valve to check the standby pressure. It should be somewhere around 450 psi. Usually the small spring breaks in the low side of the compensator valve. It is behind a small plug [1/2 inch wrench] which is beside the high pressure plug [1 and 1/8 inch wrench]. This picture shows the later style compensator valve with a screw adjustment for the pressure. The 7030 will have shim adjusted pressure setting unless someone has changed it to the later style.

Edited by Lynn Marshall - 21 Mar 2015 at 7:26pm

Thanks guys for your help save me some work on looking for the trouble.