3-point hitch hydraulic problem L3710HST

[Bluenoser]

I am hoping someone can help with a 3-point hitch hydraulic issue I have started having while using a box grader attached to my L3710HST. After using it for a while, the 3-point hitch frequently will not raise (if it is in lowered position) or will not lower (if it is in raised position). It is not the 3-point lowering speed knob under the seat as that was set correctly. The issue cures itself if I shut the tractor off and come back later or if I lower the front-end loader while the tractor is still running so I am thinking there may be a valve that is sticking. The other thing I have noticed is the hydraulic level in the sight glass varies between about 7/8 full to about 1/8 full while it was in use.

 

[TheOldHokie]

I am hoping someone can help with a 3-point hitch hydraulic issue I have started having while using a box grader attached to my L3710HST. After using it for a while, the 3-point hitch frequently will not raise (if it is in lowered position) or will not lower (if it is in raised position). It is not the 3-point lowering speed knob under the seat as that was set correctly. The issue cures itself if I shut the tractor off and come back later or if I lower the front-end loader while the tractor is still running so I am thinking there may be a valve that is sticking. The other thing I have noticed is the hydraulic level in the sight glass varies between about 7/8 full to about 1/8 full while it was in use.

The backhoe hydraulic couplers leap to mind. Any top and tilt on that 3pt? Other than the lowering speed valve I cant imagine anything hydraulic that would prevent you from lowering it.

Dan

 

[Bluenoser]

The backhoe hydraulic couplers leap to mind. Any top and tilt on that 3pt? Other than the lowering speed valve I cant imagine anything hydraulic that would prevent you from lowering it.

Dan

Thanks. I don't have any backhoe hydraulic couplers (my backhoe runs off a pump that attaches to the rear PTO). I don't have hydraulic top and tilt on the 3pt. The manual says that as long as hydraulic is showing in the sight glass, it is fine and it was showing 1/2 way up the sight glass. However, I added 1-1/2 litres of hydraulic which brought it up to 7/8 on the sight glass and tested it for a short time without the box blade freezing in place. I will test it for a longer period over the next day. Possibly it needs to run with a level near the top of the sight glass?

 

[TheOldHokie]

Thanks. I don't have any backhoe hydraulic couplers (my backhoe runs off a pump that attaches to the rear PTO). I don't have hydraulic top and tilt on the 3pt. The manual says that as long as hydraulic is showing in the sight glass, it is fine and it was showing 1/2 way up the sight glass. However, I added 1-1/2 litres of hydraulic which brought it up to 7/8 on the sight glass and tested it for a short time without the box blade freezing in place. I will test it for a longer period over the next day. Possibly it needs to run with a level near the top of the sight glass?

Seems unlikely and low fluid would not interfere with lowering the 3pt. That is controlled by the 3pt control valve. If it dumps to tank the lift will lower even with the engine and pump off.

Dan