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 | Jim White
Join Date: Posts: 1 
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2000-01-16 11995
I've recently purchased a JD 1050 tractor to replace a very old and tired Massey 165. I have a Land Pride 96" back blade, it is very heavy duty and I'm sure it is over 600Lb. On my old Massey, the tractor is able to pick up the back blade while idling, my 1050 can't budge it until it gets some rpm up (1500) and then it does not pick it up very fast. For any of you that have a 855, 955, or 1050 with power steering could you tell me if this is normal for this tractor or should I start looking for a cause of the problem. I've changed the filter, cleaned the screen, changed the fluid and went through the warm-up procedure before testing.ThanxJim
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| Roger L.
Join Date: Jun 1999 Posts: 0
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2000-01-16 12005
Does your 1050 have power steering? ....
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| Jim White
Join Date: Posts: 1
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2000-01-17 12035
Hi Rodger
Yes it does.
Jim ....
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| Roger L.
Join Date: Jun 1999 Posts: 0
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2000-01-18 12070
Jim, the reason why I asked about the PS is that your tractor has a divider (also called a priority or proportioning valve) valve in the hydraulic system which dedicates the first gallon or two per minute of hydraulic flow to the power steering system. On most tractors this means that about 25% of your maximum flow is reserved for the power steering regardless of RPM. (and most of the time regardless of whether the power steering needs it or not.) At low RPM, this 25% of full rated flow might be all that even a good pump is putting out. So at low RPM or clogged filters and screens, or high viscosity oil, or (ugh!) a worn hydraulic pump.....well, that flow to the power steering circuit might be all that your pump is putting out, leaving nothing for the 3pt.
Another possibility is the proportioning valve itself. They work by comparing spring pressure to the fluid pressure, and are adjustable. Yours may be squandering more fluid to the power steering than you would like. Repairs to this valve are not expensive.
So what I am saying is that although the symptoms sound suspiciously like something worn in the pump or 3pt system coupled with a heavy implement, it is worth considering other things. Luckily, this is easy. Every tractor I can think of has several access ports on the hydraulic system where a shop can hook up a combination pressure/flow meter. By comparing readings as they work the 3pt and power steering through the RPM range they can pin down the cause very quickly.
....
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