Advice needed on Spool End Float leak.

[Luke'sScreenName]

I have a Wood Equipment BH90-X with a slow leak from this part of the valve stack with the blue rag under it (the longest cylindrical part).



The drip is coming from the end of the cylinder closest to the ground. The end has no obvious adjustment point but has a clearly non-air-tight cover.

The parts diagram indicates this as "Repair Kit, Spool End Float" #1020080.

Messick's lists this as a $150 part! Before I spend that much I was hoping someone could explain was this part does. Maybe then I'd have some idea if this rebuild kit might fix the leak.

Why is it cylinder shaped? I assume by the name and location that it has to do with the down pressure float on the boom?

 

[Luke'sScreenName]

Anyone?

 

[Leejohn]

I think the kit you are looking at is the float repair. Look and see if a seal or o ring to seal the spool. It well go inside the valve body. Maybe this well help or get someone else to post.

 

[oldnslo]

Agree, looks like the extra length is for the flaot detent assembly. Only seal should be around the spool. The seal may be captive in a machined groove inside the end of the casting or sandwiched between the cover and end of the casting. Curious what $150 parts include.

 

[Luke'sScreenName]

Agree, looks like the extra length is for the flaot detent assembly. Only seal should be around the spool. The seal may be captive in a machined groove inside the end of the casting or sandwiched between the cover and end of the casting. Curious what $150 parts include.

The cover you're referring to is the cylindrical cover correct? The seal should be where that cylinder meets the valve block? Just want to make sure I understand correctly.

 

[oldnslo]

The cover you're referring to is the cylindrical cover correct? The seal should be where that cylinder meets the valve block? Just want to make sure I understand correctly.

Yes, I was referring to the cylindrical cover that bolts onto the valve body. Carefully loosen the screws that hold this cover on. It is possible that there could be some spring load on it. The attachment is an example of how the springs and seals are retained on this Husco valve. You can see how they are sandwiched between the cover and valve body.

 

[Luke'sScreenName]

Yes, I was referring to the cylindrical cover that bolts onto the valve body. Carefully loosen the screws that hold this cover on. It is possible that there could be some spring load on it. The attachment is an example of how the springs and seals are retained on this Husco valve. You can see how they are sandwiched between the cover and valve body.

That makes good sense. Thank you very much. I could not find a cutaway example like that. I'll take a picture of what I find.

 

[LD1]

Usually the caps (or cans) are not sealed. Most times they even have a hole in the bottom to let the oil drip out.

There should be a seal that seals the spool shaft itself to the casting. The spool (which you can see on top where the controls hook to it), also extends out the bottom side in the same manner. Only on the bottom side, instead of having the control hooked to it, it has the return springs. In the case of the longer can, not only does it have spring returns, but also that float detent.

I would assume that the $150 kit includes new springs and detent balls. But that isnt your problem. None of that is your problem. The problem is the seals that seal the spool to the bore. When they leak, they just happen to leak inside the can.

In that pic that oldnslo posted, see the one that says combination o-ring/wiper spool seals? You got the same thing on the bottom. Just have to remove the can, and detent assembly/springs to be able to get to it.

 

[Luke'sScreenName]

Y'all are exactly right. I took the can off...



The o-ring sits up next to the valve casting when the cover is on.

The end of the spool has a center column and three smaller hole. This is what fell out...

?

The spring and larger ball bearing fit up inside the spool shaft. The three smaller balls fit in the three side holes. I assume the spring goes in first then the larger ball. The three smaller balls when pressed from the outside by a sliding collet hold compression on the spring upward. (collet may not be the correct term or spelling). This is the detent for the float?

The collet is pressed down in the can and I can't get it out. I does wiggle a little side to side so I think there is an o-ring seal on the bottom side I can't see. I think perhaps it is this seal that it leaking. What do y'all think?

Also, is there a trick to reassemble the ball/spring thing?

Regardless, I ordered the rebuild kit from my local dealer for $180. I chose to pay the premium in case I can't get it back together and need their help.

 

[Luke'sScreenName]

Y'all are exactly right. I took the can off...

View attachment 476553

The o-ring sits up next to the valve casting when the cover is on.

The end of the spool has a center column and three smaller hole. This is what fell out...

View attachment 476554?

The spring and larger ball bearing fit up inside the spool shaft. The three smaller balls fit in the three side holes. I assume the spring goes in first then the larger ball. The three smaller balls when pressed from the outside by a sliding collet hold compression on the spring upward. (collet may not be the correct term or spelling). This is the detent for the float?

The collet is pressed down in the can and I can't get it out. I does wiggle a little side to side so I think there is an o-ring seal on the bottom side I can't see. I think perhaps it is this seal that it leaking. What do y'all think?

Also, is there a trick to reassemble the ball/spring thing?

Regardless, I ordered the rebuild kit from my local dealer for $180. I chose to pay the premium in case I can't get it back together and need their help.

I hope I don't have to take the swing cylinder off just below to have enough access. That would stink.