hydraulic valve replacement

ducky 55 · Sep 2, 2021

I want to replace my old valve controls for my loader on a M. Can anyone tell me what size I can use as far as GPM and PSI? Also would you recommend a 2 lever or a joy stick? Thank you in advance.

used red MN · Sep 2, 2021

I would have to guess your tractor has had a live hydraulic pump added by the distributor, those put out 12 GPM at about
1250psi. The joy stick option is up to you. You can tend to unintentionally operate two functions at once with a joy stick.
So if your flow and pressure is not the best to keep up, the function that take the least pressure to operate will be to only
one that functions. I guess what I am trying to say if a loader has a joy stick you probably need better flow and pressure
then the values above to really take advantage of them.

Janicholson · Sep 2, 2021

If you are using the M Liftall Belly pump, There are few valves or hoses you can buy that would be under rated. The only requirement is to
use open center valving. The system is open center, and using closed center valves will not work, and will overheat the system and failure
will happen.
The system is best operated with separate, not joystick, valves. Open center systems act unpredictably and dangerously with more than one
valve being used at once. Lift and lower independently of tilt/dump. Jim

D Slater · Sep 2, 2021

Does the loader have a PTO pump or other? One like this can be bought with a float on one side or not. It comes with
levers but I mounted it in a different spot. Like every thing steel they raised to around 268 with float. Bought this
one several years ago. Second tractor used on. First one had a loader. Was getting ready to break the engine in is
the reason for no hood.

ducky 55 · Sep 2, 2021

I have a live hydraulic pump at the distributor. The valve control I am looking at a 2 spool, 21GPMflow used for open center systems.It has an adjustable relieve valve range: 1500 to3625PSI.Is this something that will work for my loader? Thanks again for all the great information

D Slater · Sep 3, 2021

It should work, My only concern would be the 1500 psi being a little high for long term use on those tractors. Also
want a valve that doesn't let the boom or bucket drop some before raising if wanting to lift something real slow.
Depending on brand of valve some offer a 1000 to 1500 psi option for the relief. Most you look at for work on a M come standard with a 1500 psi though. Cross manufacture used to make and maybe still do a BA series 2 spool used on a lot of loaders with load checks and options of 1500 PSI and lower relief valve. Think a BA series 1Z0054 with adjustable relief was standard with 1500 PSI and lower.

This post was edited by D Slater on 09/03/2021 at 05:54 am.

BarnyardEngineering · Sep 3, 2021

anything you can buy these days is rated for far more pressure and gpm than any M could ever put out. You would have to look long and hard to find one that would not withstand the pressure and handle the flow. It would be some oddball antique garden tractor part.

used red MN · Sep 4, 2021

I should have chimed in sooner, my concern is the minimum bypass set point on that valve being 1500 psi. When these
tractors have the live pump put on they need a heavier cam gear, the stock originals did not handle the added load and
the teeth stripped off. The updated gears generally last well but can also fail as well. A lot of those systems had a relief
valve as part of the system that was set at the proper 1250 psi pop off. However, if the pressure hose in your system goes
from the pump directly to the loader valve it is relying on the relief set point in the valve itself. If this is the case and you lift
something real heavy or you are not paying attention and hit the end of the cylinder you will be running your pressure up
to 1500psi and straining that cam gear quite a bit. It might last that way for years and then again it could fail in the first
hour of use. If you are getting that valve I would suggest you ask the supplier if the adjustment can someway be lowered.

ducky 55 · Sep 4, 2021

(quoted from post at 23:11:59 09/03/21) I should have chimed in sooner, my concern is the minimum bypass set point on that valve being 1500 psi. When these
tractors have the live pump put on they need a heavier cam gear, the stock originals did not handle the added load and
the teeth stripped off. The updated gears generally last well but can also fail as well. A lot of those systems had a relief
valve as part of the system that was set at the proper 1250 psi pop off. However, if the pressure hose in your system goes
from the pump directly to the loader valve it is relying on the relief set point in the valve itself. If this is the case and you lift
something real heavy or you are not paying attention and hit the end of the cylinder you will be running your pressure up
to 1500psi and straining that cam gear quite a bit. It might last that way for years and then again it could fail in the first
hour of use. If you are getting that valve I would suggest you ask the supplier if the adjustment can someway be lowered.

Thanks for all the great info. I found one that they say I can adjust the psi on, so i'm going to try one and see how it works. Again thank you all for the great info. Hopefully I can get this M working again.

hydraulic valve replacement

ducky 55

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used red MN

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Janicholson

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D Slater

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ducky 55

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D Slater

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BarnyardEngineering

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used red MN

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