M7040 Weak, choppy hydraulics

[berrycw2]

Had the hydraulic fluid changed 100 hours ago on my M7040 (2011 model), 3100 hours. Used Kubota filters and fluid. The hydraulic pressure relief value by the rear remotes was adjusted to bring up the pressure a bit as it was noticed that the hydraulic flow seemed a bit weak.

Have not done a lot of work with the tractor over the winter just plowing snow on the farm every couple of weeks. Tractor worked ok up until now. Last used a couple of weeks ago. Now the hydraulics have no power. Pump is whining a bit. Power steering has no power or is very choppy. Fluid is clear, and full. No signs of any leaks.

Dealer mechanic thinks either a clogged filter, or the hydraulic pump has bit the dust. Any other suggestions?

 

[Tx Jim]

Normally hyd pump's don't just suddenly bite the dust! I suggest to perform good hyd diagnostic procedures before entertaining idea of replacing the hyd pump. I suggest checking hyd pressure with a gauge.

I've also owned a ''11 M7040 since 2012. My guess is debris is in hyd relief valve seating area or a hyd control valve is not in neutral position.

Move 3pt control lever forward an inch. If that helps restore hyd pressure then 3pt feedback rod needs adjusting.

 

[TheOldHokie]

Had the hydraulic fluid changed 100 hours ago on my M7040 (2011 model), 3100 hours. Used Kubota filters and fluid. The hydraulic pressure relief value by the rear remotes was adjusted to bring up the pressure a bit as it was noticed that the hydraulic flow seemed a bit weak.

Have not done a lot of work with the tractor over the winter just plowing sn on the farm every couple of weeks. Tractor worked ok up until now. Last used a couple of weeks ago. Now the hydraulics have no power. Pump is whining a bit. Power steering has no power or is very choppy. Fluid is clear, and full. No signs of any leaks.

Dealer mechanic thinks either a clogged filter, or the hydraulic pump has bit the dust. Any other suggestions?

Sounds like the pump is being starved of oil. Measure the flow coming from the pump. Do you have a loader and is this a cab or open station model?

Dan