M9000DTM hydraulic help

[Atlas1]

Hey all-

M9000DTM (4wd, mudder, ROPS).
Individual flow hydraulic pump (twin pumps for 3pth and remotes, single pump for steering)
3 remote valves

3pth had been bouncing/leaking down occasionally. Tried lots of different fixes, nothing worked. Noticed the hydraulic pump was getting hot. Tore down pump to find melted o-rings. Replaced/resealed pump. No change in 3pth bounce. Decided to replace control valve under the rockshaft cover. Resealed lift cylinder while I was in there. This fixed the bounce and leakdown, but the pump is still running hotter than I think it should be. Just sitting in the yard running at PTO speed, after an hour or so, the pump reads 150-155 degrees. I have seen it get to 175 degrees while driving on the road.

Any ideas on whats happening here? Am I right to think its running too hot, or am I crazy? Thanks guys.

 

[Dave_eng]

There will be a feedback rod connected to one of the 3 pt lift arms and at the other end connected to the 3 pt control valve. it purpose is to not allow the 3 pt to stay constantly calling for hydraulic pressure. If it is not adjusted properly the pump will he hitting the relief valve and over time heating the hydraulic fluid too high.

Dave

 

[Atlas1]

That’s good info Dave, thank you. Wouldn’t I hear the relief valve hitting though or am I overthinking this?

 

[TheOldHokie]

Hey all-

M9000DTM (4wd, mudder, ROPS).
Individual flow hydraulic pump (twin pumps for 3pth and remotes, single pump for steering)
3 remote valves

3pth had been bouncing/leaking down occasionally. Tried lots of different fixes, nothing worked. Noticed the hydraulic pump was getting hot. Tore down pump to find melted o-rings. Replaced/resealed pump. No change in 3pth bounce. Decided to replace control valve under the rockshaft cover. Resealed lift cylinder while I was in there. This fixed the bounce and leakdown, but the pump is still running hotter than I think it should be. Just sitting in the yard running at PTO speed, after an hour or so, the pump reads 150-155 degrees. I have seen it get to 175 degrees while driving on the road.

Any ideas on whats happening here? Am I right to think its running too hot, or am I crazy? Thanks guys.

That temp is hot but not crazy high. Upper operational temperature for hydraulic oil is 80C (176F) and the pump can easily get hotter than the oil. Put a pressure gauge on the implement circuit and see what it says. Should not be much pressure when all the valves are in neutral.

Dan

 

[Dave_eng]

That’s good info Dave, thank you. Wouldn’t I hear the relief valve hitting though or am I overthinking this?

Have you ever heard the relief valve in earlier years?
Usually the engine noise drowns it out.
Running oil thru the relief valve is a quick way to heat it up.
You can always do as Dan suggests if you have the gauge and hardware
Dave

 

[TheOldHokie]

Have you ever heard the relief valve in earlier years?
Usually the engine noise drowns it out.
Running oil thru the relief valve is a quick way to heat it up.
You can always do as Dan suggests if you have the gauge and hardware
Dave

If not buy a gauge and tee - cheap and useful addition to any tractor owners toolbox. Takes a lot of the guesswork out.

Dan