Questions on buying loader control valve for tractor

nrowles · May 11, 2017

I need to buy a loader control valve for my tractor and have a couple questions.

1. I think my crankshaft run pump puts out 17gpm. I assume I need to get a valve that produces at least 17gpm to get the full benefit of my pump? For example, doing a quick search I'm looking at a 12gpm and a 25gpm. If I were to decide to get one of these I would want to get the 25gpm, correct?

2. The valve is run off a crankshaft connected pump. Does this mean I need to get an open center since there is a constant pumping of fluid?

coshoo · May 11, 2017

You'll want a valve with a higher capacity than your pump, so go with the 25 GPM. And yes, you need an open center valve. You might consider one with a float position for the loader- very handy when going backwards to smooth dirt or gravel.

Zachary Hoyt · May 11, 2017

Check out surpluscenter.com, they generally have good prices on hydraulic stuff.
Zach

BarnyardEngineering · May 11, 2017

1. To be accurate with what you're saying, the valve doesn't "produce" flow. It allows flow. As you suspect, a 12GPM valve would not let you take advantage of the 17GPM capacity of the pump.

2. Yes, it would be an open center system.

nrowles · May 11, 2017

(quoted from post at 06:03:56 05/11/17) You'll want a valve with a higher capacity than your pump, so go with the 25 GPM. And yes, you need an open center valve. You might consider one with a float position for the loader- very handy when going backwards to smooth dirt or gravel.

I do want one with float but am a little confused in what I'm reading. I am currently looking at 2 different Prince valves. Can you take a look at the chart below? I am looking at the 2 different valves starting in RD522. One is labeled a float spool and the other labeled 3 position 4 way. I read elsewhere that a 3 position 4 way can also provide float. So what's the difference? Maybe I read incorrectly.

Destroked 450 · May 11, 2017

3 position 4 way is standard, float is a add on that gives 4 positions.
For float you want valve # RD522GCGA5A4B1 if you want joystick control change the last number 1 to a 5

RD52 = 25 gpm 2 spool valve
2 = 3/4 npt inlet/outlet ports, 1/2 npt work ports
G = 3 position 4 way with float on the 1st spool
C = 3 position 4 way on the second spool
G = spring center to neutral with detent in float on the 1st spool
A = spring center to neutral on the 2nd spool
5 = 1500-3000 psi adjustable relief valve set at 2000 psi
A = inlet location on the end or side of the valve
4 = outlet location on the end or side of the valve with power beyond options B,C,D,F
B = power beyond option B, with conversion plug installed
1 = with complete handle assemblies

My personal choice would be valve # RD526GCGA5A4B5
Same valve only with SAE ports (6) instead of pipe threads (2) and a joystick control (5) instead of two handles (1)

nrowles · May 11, 2017

(quoted from post at 08:42:17 05/11/17)
3 position 4 way is standard, float is a add on that gives 4 positions.
For float you want valve # RD522GCGA5A4B1 if you want joystick control change the last number 1 to a 5

RD52 = 25 gpm 2 spool valve
2 = 3/4 npt inlet/outlet ports, 1/2 npt work ports
G = 3 position 4 way with float on the 1st spool
C = 3 position 4 way on the second spool
G = spring center to neutral with detent in float on the 1st spool
A = spring center to neutral on the 2nd spool
5 = 1500-3000 psi adjustable relief valve set at 2000 psi
A = inlet location on the end or side of the valve
4 = outlet location on the end or side of the valve with power beyond options B,C,D,F
B = power beyond option B, with conversion plug installed
1 = with complete handle assemblies

My personal choice would be valve # RD526GCGA5A4B5
Same valve only with SAE ports (6) instead of pipe threads (2) and a joystick control (5) instead of two handles (1)

Thanks.

I think I will also add the detent kit. With my current valve, to curl the bucket all I have to do is slap it back and go. Makes it quicker with having to change gears.

Briar Hill Brittanys · May 11, 2017

[color=red:57eec8b7d6][/color:57eec8b7d6]"2. The valve is run off a crankshaft connected pump. Does this mean I need to get an open center since there is a constant pumping of fluid?"

My JD 1020 has a crank driven hydraulic pump, it's a closed center system. Don't know what your tractor is, but you might want to double check. Hope this helps.

Destroked 450 · May 11, 2017

I don't care for detent on the bucket control, I have trouble making minor adjustments with it, it's also dangerous if the bucket rolls all the way back when the loader is raised all the way up, it could dump the load back onto the operator.

A few years ago a farmers wife was killed when round bale of hay she was moving rolled back down the loader onto her.

Destroked 450 · May 11, 2017

(quoted from post at 11:27:59 05/11/17) [color=red:ee2e8880ab][/color:ee2e8880ab]"2. The valve is run off a crankshaft connected pump. Does this mean I need to get an open center since there is a constant pumping of fluid?"

My JD 1020 has a crank driven hydraulic pump, it's a closed center system. Don't know what your tractor is, but you might want to double check. Hope this helps.

Good point, I keep forgetting about JD's closed center system, That valve can be changed by replacing the conversion plug with a closed center plug.

Destroked 450 · May 11, 2017

I don't care for detent on the bucket control, I have trouble making minor adjustments with it, it's also dangerous if the bucket rolls all the way back when the loader is raised all the way up, it could dump the load back onto the operator.

A few years ago a farmers wife was killed when round bale of hay she was moving rolled back down the loader onto her.

Hayfarmer · May 11, 2017

that detent on the bucket would be a good thing, on my old JD#35 loader I am always haveing to hold that lever back while backing up and trying to steer(armstrong steering) have wished I had a detent on that side.

Questions on buying loader control valve for tractor

nrowles

Member

coshoo

Well-known Member

Zachary Hoyt

Well-known Member

BarnyardEngineering

Well-known Member

nrowles

Member

Destroked 450

Well-known Member

nrowles

Member

Briar Hill Brittanys

Well-known Member

Destroked 450

Well-known Member

Destroked 450

Well-known Member

Destroked 450

Well-known Member

Hayfarmer

Well-known Member

Similar threads