new spool valve

TimPa · Aug 11, 2018

So the spool valve on my dunham lehr 22 loader failed (left spool stuck in) and hydraulic shop said they cannot repair. ordered a cross BA2 F2 with float, should be here next week. since i've had the system open now, does anybody any words of wisdom on installing the new valve, bleeding, and making sure i don't get another valve failure? '78 ford 3600

the last valve failed about 10 minutes after remounting the loader after having it off for sickle mowing the fields.

sotxbill · Aug 11, 2018

failure caused by???

water, rust, lots of water and contaminants in the fluid?
Mechanical wear and damage

I am guessing it failed due to wear and mechanical damage making the spool stick.. maybe at the notch where the detent locks the spool. rust in detents?

Normally disconnecting and connection are not a problem as the hydraulic ends keep the fluid in the systems. So unless your doing some unusual in the operation or hook up, the valve is designed to operate a loader for years before failure. Disconnects should not bother the system. leaving it with contaminated fluid could cause it to rust in place.

Destroked 450 · Aug 11, 2018

My Farmhand 22 loader has a Gresen valve on it, these valves and the Cross you ordered don't give problems unless they get trash or water in them.

Also sounds like the hydraulic shop didn't try very hard to free it up.

Are you using quick couplers or some form of hard piping, make sure to clean the couples good before plugging them in.

TimPa · Aug 12, 2018

(quoted from post at 08:43:21 08/11/18)
failure caused by???

water, rust, lots of water and contaminants in the fluid?
Mechanical wear and damage

I am guessing it failed due to wear and mechanical damage making the spool stick.. maybe at the notch where the detent locks the spool. rust in detents?

Normally disconnecting and connection are not a problem as the hydraulic ends keep the fluid in the systems. So unless your doing some unusual in the operation or hook up, the valve is designed to operate a loader for years before failure. Disconnects should not bother the system. leaving it with contaminated fluid could cause it to rust in place.

been a great system so far. 1st time removing and reinstalling. has quick disconnects on the auxiliary valve, thought i had everything clean. i figure some spec dislodged and got in the spool. nothing obvious when you look at the spool. he said i couldn't/shouldn't run any abrasive in the valve body. i was tempted to roll up some 400 grit and pass it through... he also said gresen parts are now very $$$

sotxbill · Aug 12, 2018

Maybe the valve body had wear or a groove in it that caused the failure. They have to be very very very close tolerances to work correctly. But again, not normally a problem. New loaders are quick 'tach loaders that are removed all the time with no problems.

However, dirt, abrasives, water all can cause problems in any system.

Some of the old timers said that when you plug in a new (used) piece of equipment to your system, that it might have old contaminated oil and will ruin your system. Its much of a wives tale, but there might be some truth to it one in a million times. So, guess your supposed to drain and flush any equipment you buy so you know its clean before connecting to your tractor?????

sotxbill · Aug 12, 2018

Another thought,, some tractors (john deere)have contaminated fluid due to brake shoes coming apart. This will destroy the hydraulic pump and anything else in the system. Dont remember if you have wet brakes or not.

TimPa · Aug 12, 2018

have these:

Destroked 450 · Aug 12, 2018

Just a thought.
Did you get them connected like they where before, if not you could be back flowing fluid through the valve.

TimPa · Aug 12, 2018

i took real good pics for that. it actually was working for about 5 minutes, noticed left spool valve starting to stick forward (no float) and then it stuck for good.

TimPa · Aug 12, 2018

i agree, he was more interested in selling me a new one when i asked about any repairs. i should have went elsewhere before buying a new one.

new spool valve

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