Oliver 1650 Hydraulic noise/temp?

[RLTW]

I’ve got another question on the 1650 for you guys.
I’m getting a whining noise from what I believe to be the hydraulic system between my legs on the seat. It is louder and quieter at different times. I also took a temperature gun reading of the housing underneath the seat, it was 190 degrees after about 10 min of run time. Too hot to touch very long.
This tractor sat outside for years before I bought it, so I pumped all the hydraulic fluid I could get out of it by disconnecting a remote line and pumping the fluid out twice. Added new fluid with a new filter twice. All that done and the fluid is still milky looking but not sure if it’s from moisture still in there or from being foamed up.
The hydraulic levers seem awfully sticky when moving them.
So my question is, could my valves be sticking and causing the pump to work and heat up and foam the fluid? If so, can I rebuild the valves?
Or Is there anything else I should be considering as a culprit?
Thanks in advance for any advice.

 

[rrlund]

Does the noise go away when you're lowering or raising the three point? The linkage could be out of adjustment so it's still trying to raise after it's all the way up.

 

[RLTW]

Seems to stay constant when I mess with the 3 point.

 

[rrlund]

Have you changed the filter?

 

[RLTW]

Yes, new filter.

 

[scootergmc]

What is the history of the tractor? Does the fluid level stay constant? Does it get hard to steer?

 

[RLTW]

I don’t have much history. I bought it from a neighbor who parked it with fuel issues. I got it running and am just driving it around the barnyard. Could have had a bad hyd pump when he parked it too for all I know. I’ve never been around any other Olivers to know what’s “normal”.

 

[RLTW]

Fluid level stays constant, the steering never changes.

 

[Mike(NEOhio)]

Did it ever have a loader on it or some other use of the power beyond? Does the noise change when you deadhead the remotes?

 

[tom upton]

I’ve got another question on the 1650 for you guys.
I’m getting a whining noise from what I believe to be the hydraulic system between my legs on the seat. It is louder and quieter at different times. I also took a temperature gun reading of the housing underneath the seat, it was 190 degrees after about 10 min of run time. Too hot to touch very long.
This tractor sat outside for years before I bought it, so I pumped all the hydraulic fluid I could get out of it by disconnecting a remote line and pumping the fluid out twice. Added new fluid with a new filter twice. All that done and the fluid is still milky looking but not sure if it’s from moisture still in there or from being foamed up.
The hydraulic levers seem awfully sticky when moving them.
So my question is, could my valves be sticking and causing the pump to work and heat up and foam the fluid? If so, can I rebuild the valves?
Or Is there anything else I should be considering as a culprit?
Thanks in advance for any advice.

First thing I would look at is the main relief. Big hex plug on the side of housing down by your right foot. Pull it out and examine it to see if there is a piece of crud holding relief open at all. If it is held open it will make noise and heat oil quickly like you describe.

 

[Kell]

190F seems too hot unless it's 110F ambient and the system is getting worked.

there is a small metal tray under the pump inlet that is welded to the steel pan that forms the floor of the hydraulic res.
it can break free from the welds over time and get sucked up against the inlet, partially blocking flow.

aerated oil is typical when you pump out the res, and they never empty completely--usually about 1qt or so left in the deep end of the pan beneath the pump.

 

[RLTW]

Update….
I saw that one of the hydraulic levers would stick slightly and not return to neutral. I removed the top cover, cleaned all the crud out of the resovoir pan, and removed the hydraulic valve/piston(?) from the suspected troublesome side. Nothing obviously wrong with it, but I lubed it with some lubriplate and re assembled it. I lubed the forks on the connection to the lever too. New top cover gasket and o rings on the 6 standpipes.
Ran it last night and it seems to have solved the issue. No noise, and the housing is staying cool.
Thanks for everyone’s interest/replies.

 

[Kell]

the main thing with the interlock valves and main spools is being clean and free of burrs/deformations.

was there any grit/hard stuff in the "crud" you removed from cover or pan? it's imperative to keep hydraulic receivers and attachment hose ends very clean. the filter is behind the pump so any dirt that enters the system goes back to the res and through the pump before being filtered out.

hopefully, you resealed the lever pivot shafts as well; those are a common and annoying leak!