PineRidge
Super Member
So... I guess you could say that you had junk in your trunk.
Glad you got it sorted out.
Glad you got it sorted out.
Outrigger on new BH does not have much downforce...?
- Thread starter heron
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Soundguy
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ack! 
J_J
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heron,
You said this:
If the seals were defective would the boom still have plenty of power? It all seems to work perfectly until I want it to stay up. Pretty much have to watch backing up b/c if I forget about it for more than a few minutes without reaching back and pulling on lever to pull it up every few minutes the bucket will be on the ground.
Every few minutes the buckets drops to the ground, is a significant leak. I would think you are losing power on that hyd circuit be it cyl or spool.
It depends on the amount of leakage. If your cyl or load can make the relief activate, then the pump is producing the set pressure, and force will be as factory stated. If you loose some psi due to seal leakage, then you will work at reduced capacity.
If you install a hyd gage in a tee in the IN port of the BH valve, you will see any pressure the BH is developing.
Then use that as a guide as to capability.
You said this:
If the seals were defective would the boom still have plenty of power? It all seems to work perfectly until I want it to stay up. Pretty much have to watch backing up b/c if I forget about it for more than a few minutes without reaching back and pulling on lever to pull it up every few minutes the bucket will be on the ground.
Every few minutes the buckets drops to the ground, is a significant leak. I would think you are losing power on that hyd circuit be it cyl or spool.
It depends on the amount of leakage. If your cyl or load can make the relief activate, then the pump is producing the set pressure, and force will be as factory stated. If you loose some psi due to seal leakage, then you will work at reduced capacity.
If you install a hyd gage in a tee in the IN port of the BH valve, you will see any pressure the BH is developing.
Then use that as a guide as to capability.
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Okay, had a look at the linkage today. Excuse my lack of terminology. From what I saw if the spool is spun around at say 12 and 6 so the bolt from the linkage is parallel with the valve assembly the boom drops. When I turned the spool so the bolt going thru the top was at about 11 and 4 the boom does not drop. So basically the spool has to be in the correct orientation to hold pressure...? The spool being in the "neutral" position is perfect so the linkage to the boom is not applying any extra force down actuating the spool to drop the boom even ever so slightly(which is what I thought it may be).
Is it normal that the spool has to be in exactly the right place in order for it to seal properly? I guess I imagined the spool closure was a complete 360 degree radius and it didn't matter which exact way it was spun. I did spin them a bit in order to undue the linkages when I removed the valve body. Hope I solved it..
Is it normal that the spool has to be in exactly the right place in order for it to seal properly? I guess I imagined the spool closure was a complete 360 degree radius and it didn't matter which exact way it was spun. I did spin them a bit in order to undue the linkages when I removed the valve body. Hope I solved it..
Soundguy
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perhaps there is a machineing difference on the shaft?
J_J
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Those spools are selected to match up to the bore of the spool, and an unused spool should still be tight. You should be able to turn it 180 in the bore and have the same operation. The centering springs might not be centering the spool, and causing the spool to be shifted a little. I believe there is a nut on the end of the spool, so check and see if it is tight.
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wdchyd
Elite Member
My guess would be there is a difference in the linkage alignment not allowing the spool to self-center in one direction and is allowing the other....or more crud inside the cover under that spool also, making it not self center when the rust/dirt are under the spacers/washers
the spools are precision ground to fit the precision honed bores..(usually .001" to .0005")...if there was an imperfection in the housing or spool then it would bind
the spools are precision ground to fit the precision honed bores..(usually .001" to .0005")...if there was an imperfection in the housing or spool then it would bind
J_J
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You might try reversing the work port hoses and see if the boom will stay up.
A weak spring would let the spool not center and some fluid would flow.
A weak spring would let the spool not center and some fluid would flow.
I'm going to run it over the next weekend and if it holds up I'm not messing with it. To check the screw on the end I'll have to remove the entire valve body again and it's a royal pain to get all the hoses off. Plus if the screw was loose I'd think turning the spool would not make any difference....right? My plan is if I run it and it still drops I'll remove the valve body again and check the "check valve" for improper function, check the screw..and throw the thing on the closest rock...just kiddin
)Definitely a unique experience. Overall I like the power and reach of this 8600 Ameriquip. It's a heavy beast for this 4200 lb tractor but it's got good breakout force and it's pretty smooth.
I checked the linkage alignment and it is perfect. I'll pull it apart again if the boom drops after this next weekend. I'm not doubting you on the tolerances but I literally turned it one way and watched the boom drop and then turned it the other way and the boom stayed put...?
