JD 1050 Hydraulic Issue

Tippybw · Aug 25, 2017

JD 1050 (Yanmar early model) that was recently acquired has a hydraulic issue that I need help with. It has a loader and a grader blade on the 3pt. At 1000rpm the loader will hesitate for 6-15sec before it will start to move, and it is slow when it does. To get decent lift rate it has to be running 1500rpm+ with or with a load in the bucket. The 3pt is the same way with an exception; raise the 3pt to the top, slowly lower lever till blade drops 4-6 inches(still off the ground), move lever i(to raise) 3/8" nothing happens, another 3/8" nothing, after the third time the blade jumps up 2". This is at 1000rpm or 1800rpm. Tractor has 956hrs, new hydraulic filter, proper fluid level and the hydraulic shut-off valve fully open. Any and all help is appreciated. Thank you.

rScotty · Aug 26, 2017

Tippybw said:
JD 1050 (Yanmar early model) that was recently acquired has a hydraulic issue that I need help with. It has a loader and a grader blade on the 3pt. At 1000rpm the loader will hesitate for 6-15sec before it will start to move, and it is slow when it does. To get decent lift rate it has to be running 1500rpm+ with or with a load in the bucket. The 3pt is the same way with an exception; raise the 3pt to the top, slowly lower lever till blade drops 4-6 inches(still off the ground), move lever i(to raise) 3/8" nothing happens, another 3/8" nothing, after the third time the blade jumps up 2". This is at 1000rpm or 1800rpm. Tractor has 956hrs, new hydraulic filter, proper fluid level and the hydraulic shut-off valve fully open. Any and all help is appreciated. Thank you.

I know the Yanmar hydraulic system fairly well; it is what is called an "open-center" type.
John Deere prefers a more complex "closed-center" hydraulic system in many of their tractors, but I don't know if Yanmar used that when they built the 1050. The 1050 had several features not common to the Yanmars of the time, including a turbo I believe.
If the 1050 used a closed center type with a pressure accumulator then that's where I would look.
Is anyone familiar with the 1050 hydraulics?
rScotty

Dave M7040 · Aug 26, 2017

Is there a hydraulic pump attached to the front of the engine?

Investing in a pressure gauge with the necessary quick connect fitting for your tractor for about $30 will help diagnose what is happening.

Does your machine have power steering?

Some photos would help us help you.

Dave M7040

Spanner · Aug 26, 2017

Sounds possibly like a blocked suction filter. When you changed the hydraulic oil & filter did you remove the Suction Screen/Filter and clean/wash it?

Rock knocker · Aug 27, 2017

rScotty said:
I know the Yanmar hydraulic system fairly well; it is what is called an "open-center" type.
John Deere prefers a more complex "closed-center" hydraulic system in many of their tractors, but I don't know if Yanmar used that when they built the 1050. The 1050 had several features not common to the Yanmars of the time, including a turbo I believe.
If the 1050 used a closed center type with a pressure accumulator then that's where I would look.
Is anyone familiar with the 1050 hydraulics?
rScotty

The 850-1050 are all open center systems, and share most if not all parts.

Rock knocker · Aug 27, 2017

Spanner said:
Sounds possibly like a blocked suction filter.

Ditto

rScotty · Aug 28, 2017

Rock knocker said:
The 850-1050 are all open center systems, and share most if not all parts.

Not being open center, there won't be a hydraulic pressure accumulator. So about the only thing left is some sort of restriction to or from the hydraulic pump. Offhand, I can't think of another brand of tractor that had a cleanable hydraulic filter, but all of the Yanmars did. In addition to the spin-on replacement filter, Yanmar/Deeres had a cylindrical fine screen suction filter that could be cleaned periodically. Look under a triangular cover about where your right heel sits. (on the left on some models).
It would be nice if it were something so simple.
rScotty

Rock knocker · Aug 28, 2017

Hopefully these help the OP to know where the suction filter is located.

Rock knocker · Aug 28, 2017

On another thread, either here or on a different forum, a poster was explaining how an internally leaky three-point gallery could affect hydraulic performance upstream. I've looked but I can't find it, sorry.