1500D Hydraulics

Tractors4u · Mar 14, 2003

Bruce is right. It is the simplest way to hook it up. Think of it in terms of electricity. You are put the controller in "series". When you connect the line out back the supply line that runs to the rear of the tractor you are completing the circuit. The fluid is still under pressure and it is going to the 3 point to do more work and then it is dumped back into the tank.

Inspector507 · Mar 15, 2003

I guess I was wondering where the "used" or return fluid goes. I assume from your post it returns to the hydraulic system and is still under pressure through the outlet port.

EFC · Mar 15, 2003

Open center systems always have to maintain flow from the pump to the sump if it is ever blocked the pump goes BOOM! You can just plumb form one valve to the next going in and out in and out till it dumps in the sump. Until you activate a spool there is no real pressure. The three point is just a valve like your loader valve and works no differently. It has an input and output. you plumb from the loader valve out to the 3pt valve in. That works great unless your three point valve has a sticky spool or there is a block in the line like a quick disconnect coming unplugged. Then there is no place for the pressure to go so the pump goes BOOM (or heats up and smokes like a stuck spool would cause! The way around that is to use a PB valve. you plumb from the PB valve on the loader to the input of the 3pt valve. the output of the loader goes directly to the sump. Inside the loader valve is a high pressure bypass circuit. If the 3pt spool or a quick disconnect came unplugged the loader valve would just port that pressure to the sump so the pump is saved. Either way works on these low flow pumps but if you run quick disconnects or remote disconnects then I would most definitely use the PB valve. I have about 40 pumps in a box that are ruined from quick disconnects coming unplugged.

Inspector507 · Mar 15, 2003

Thanks Buck,
I think I'm finally understanding most of this.
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gerlacr · May 15, 2003

Buck

I do not recall seeing an answer to my question about an extender for the filler tube on my YM1500D. I am finally done with the loader and all of the hydraulic lines except for the low pressure return to the sump. The plastic filler cap threads are approximately 1.25" in diameter. You stated that I should be able to find an extension with a right angle JIC fitting built in. Any suggestions of where to find one.

Ron