Case/David Brown 995 tractor/70 loader hydraulic issues

Jbschema · Oct 1, 2017

I have a case/David Brown 995 w/ 70 loader - problem I'm having is the loader raise very very slow( with no load on it ) with the engine at higher rpms but the bucket raises and lowers just fine at lower rpms - I changed the hydraulic filter and fluids - still same problem yet - loader does stay up when I'm done raising it so I know there isn't blow by on the lift cylinders
Switched the hoses around on directional valve to rule out any possible bad valve spool blow by - still the same
Only other possible idea is the hydraulics pump getting weak or pressure relief is going bad
Any other suggestions would be greatly appreciated
Jesse

Bret4207 · Oct 2, 2017

I'm no expert in this stuff, but if there are quick disconnects involved, I know they can wear over time and reduce flow. Might be worth a look. I had one that got some gunk in the opening that simply required back flushing once I took it off. If everything else works fine, I'd start there.

Adirondack case guy · Oct 2, 2017

If it is indeed a 70 loader on your 995 rather than the 60L loader that was built for the DB tractors, your problem is the size of the lift cylinders. The 70 loader had cylinders sized for much larger hyd. pump flow. About all you can do is to put smaller diameter lift cylinders onto the loader to speed up the lift cycle.
Loren

Determined · Oct 2, 2017

Did this just start happening?

Did you buy it like that?

Are you doing an install and trying to get it working?

Cylinders could be plumbed wrong.

Obstruction in a hose.

Flattened metal line.

Mechanical interference, seized pins.

Bad seals or damaged/broken gland in a cylinder.

Bent rod.

Try mechanically disconnecting the end of the cylinders from the loader and see how or if they function independently.

Tee in a gauge right at the cylinder and see what you have for pressure.

Jbschema · Oct 2, 2017

Correction -60 loader
Just started to have this problems a few months back - had this tractor for several years with no issues till recently - no replreplumping or adjustments
Check for pinched lInes - nothing

Determined · Oct 2, 2017

If your pressure checks out good I would be testing the cylinders individually.

I have more than once come across it where the nut or bolt holding the gland onto the rod has come off.
When this happens you have pressurized flow at both ports of the cylinder fighting each other.

Try fully retracting the cylinders then crack loose the line on the cylinder that supplies oil for the lifting function.

Next operate the control again in the direction that would retract the cylinder, if you get oil spraying out the fitting that you loosened then you have identified which cylinder you need to take apart.

Case/David Brown 995 tractor/70 loader hydraulic issues

Jbschema

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Bret4207

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Adirondack case guy

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Determined

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Jbschema

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Determined

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