JD 1050 Hydraulic Issue

[Tippybw]

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]

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]

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]

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]

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]

Sounds possibly like a blocked suction filter.

Ditto

 

[rScotty]

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]

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

 

[Rock knocker]

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.

 

[Spanner]

For Serial #'s -11000 yes

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

And... On later models (Serial # 11001- onwards) it's here:

 

[Relic repair]

Sounds like a hydralic pump, if suction filter is not clogged then my next move would be to hook up to the output of the pump. In other words isolate the pump by disconnecting the output line and insallnew line on it's place . A flowmeter hooked up then the pump can be tested for max pressure and flow and compared to specs. Another more economical way would be to put a 2,000psi gaige teed into the new line then next inline a adjustable shut off valve with a hose leadong from there to the oil fill port. With valve wide open start tractor increase throttle to 1700 to 1800 rpm . slowly start closing valve until it reaches max pressure as called for in book. Raise hose from oil fill port and observe flow. If it has dropped off to nothing then pump is bad. Next this gets a little messy but take an empty 5 gallon bucket and swing the hose over into the bucket and time it for 15 seconds. Then measure it the dp the math to convert your volume to gallons per minute and compate to specs. Done this several times and works like a charm. Been a tractor mechanic for 42 plus years and even though wanted it to be something simple and cheaper than a pump, with your symptoms it was usually the pump. One thought, does the power steering work and of it does try steering and raise the loader.

 

[Dave M7040]

Here is a long shot.

A guy with an old but heavy duty long splitter decided to add a new gas driven 2 stage pump and auto return valve to his existing cylinder and beam.

It would never work properly. I suggested he run the output of the pump into a bucket. That worked fine.

Then someone suggested he check the fittings showing up in his photos and surprise surprise, one was an orifice fitting. i.e. a fitting with a small hole inside to limit hydraulic flow rates and thus speed of the cylinder.

He shopped at TSC and you would not think they would be carrying orifice fittings.

If any fitting has been changed it would be worth checking.

Dave M7040

 

[medic0648]

I had an 850 for a while, same basic machine. If it has the power steering plumbed like a lot did it tends to mess with the loader and 3 point. Trace the hoses and if it has the power steering plumbed from the outlet of the loader instead of the on port try working the steering wheel and using the loader/3ph