gckshea
Bronze Member
Hi All!
I have a circa 1998 Woods BH7500 3-point mount backhoe. I just had all the seals, O-rings, and spools changed out in the valve control block due to leaking and erratic flow in various cylinder movements. Great! The thing doesn't leak any longer. BUT...
After reinstalling the block of valves, and reconnecting the linkages to the two tall control levers, the left hand lever seems to still stick in the forward and back direction, which controls the boom. Man, it's spooky to have an already jerky fast movement of the boom, then now lose fine control of feathering the lever to control movement, and then...have the boom keep moving after releasing the lever!
I looked at all the movements of the lever and the connections to the linkages, on both levers, in all directions, just to see what could be binding. You see, the boom spool moves just fine if I DO NOT tighten the bolts and nuts too tightly, as if to allow the linkage to rotate a little on the spool connection. Only on the left one. Something looks a little off on the geometry of the push-pull of the spool, even though it has a swivel ball connector to allow for non-linear movement of the lever...
It's almost as if the hole drilled in the control lever handle plate that attaches to the spool is not dead center, so an off center motion occurs when I move the lever. But, loosen the Nylok nut a little on the spool connection, and the bolt that attaches the lever, and it all moves fine - and I'd leave it like that except I'm concerned about vibration and use over time causing a bolt or nut to drop off somewhere and right at a bad time. I thought about counting on some Blue Medium Loctite to hold it on a non-snug position, but that doesn't give me the fizz.
Photo #3 shows the swivel connector lossened a little to allow free movement, but it is not vertical and lined up over the spool end, like the whole connection wants to be able to rotate. The geometry is wrong. But why?
Thoughts?
I have a circa 1998 Woods BH7500 3-point mount backhoe. I just had all the seals, O-rings, and spools changed out in the valve control block due to leaking and erratic flow in various cylinder movements. Great! The thing doesn't leak any longer. BUT...
After reinstalling the block of valves, and reconnecting the linkages to the two tall control levers, the left hand lever seems to still stick in the forward and back direction, which controls the boom. Man, it's spooky to have an already jerky fast movement of the boom, then now lose fine control of feathering the lever to control movement, and then...have the boom keep moving after releasing the lever!
I looked at all the movements of the lever and the connections to the linkages, on both levers, in all directions, just to see what could be binding. You see, the boom spool moves just fine if I DO NOT tighten the bolts and nuts too tightly, as if to allow the linkage to rotate a little on the spool connection. Only on the left one. Something looks a little off on the geometry of the push-pull of the spool, even though it has a swivel ball connector to allow for non-linear movement of the lever...
It's almost as if the hole drilled in the control lever handle plate that attaches to the spool is not dead center, so an off center motion occurs when I move the lever. But, loosen the Nylok nut a little on the spool connection, and the bolt that attaches the lever, and it all moves fine - and I'd leave it like that except I'm concerned about vibration and use over time causing a bolt or nut to drop off somewhere and right at a bad time. I thought about counting on some Blue Medium Loctite to hold it on a non-snug position, but that doesn't give me the fizz.
Photo #3 shows the swivel connector lossened a little to allow free movement, but it is not vertical and lined up over the spool end, like the whole connection wants to be able to rotate. The geometry is wrong. But why?
Thoughts?
