I'm hoping to find someone who could help diagnose a problem with the shuttle clutches on the lower (reverse) shaft.
This shaft gives you a "forward and reverse" direction on 3 functions; travel,swing, and boom.
Right now the units's clutch near the reducing transmission will make the unit crawl backwards, swing to the left, and lower the boom. The operator's side clutch will not put out enough torqe to travel forward,swing right, or raise the boom. The crane had just finished enlarging a fishing lake before the problems showed up.
If I put slack in the boom cables, the clutch will work just enough to take out the slack, but will slip when it tries to raise the weight of the boom. Same with forward travel and right swing. It "tries", puts out a little torque, but slips.
The operator's manual says there is only one adjustment on each clutch, a threaded ring that will screw inwards to crowd the driving clutch disk further into the driven disk. The carrier sleeve has 3 toggle levers and rollers inside which are supposed to give some extra leverage (I believe) in forcing the disks together, and toggle in to hold the disks in the engaged position until you use the clutch lever to pop the levers out of engagement. I have adjusted the collar back and forth, but no firm engagement or toggling happens. Also, the other clutch will work its functions, but only if you put a lot of pressure on the lever, but it will not toggle in, either. The friction wedges look to be the same thickness on both clutches, they look like they shouldn't be worn down enough to slip, but manual doesn't say how to tell.
Does anyone out there know if the 3 internal toggle levers and/or rollers can wear enough to cause slippage and lack of toggling? By the way, one mechanic said he believed these clutches were very similar to those on the Bucyrus-Erie 20-B cranes. Any help would be greatly appreciated.
This shaft gives you a "forward and reverse" direction on 3 functions; travel,swing, and boom.
Right now the units's clutch near the reducing transmission will make the unit crawl backwards, swing to the left, and lower the boom. The operator's side clutch will not put out enough torqe to travel forward,swing right, or raise the boom. The crane had just finished enlarging a fishing lake before the problems showed up.
If I put slack in the boom cables, the clutch will work just enough to take out the slack, but will slip when it tries to raise the weight of the boom. Same with forward travel and right swing. It "tries", puts out a little torque, but slips.
The operator's manual says there is only one adjustment on each clutch, a threaded ring that will screw inwards to crowd the driving clutch disk further into the driven disk. The carrier sleeve has 3 toggle levers and rollers inside which are supposed to give some extra leverage (I believe) in forcing the disks together, and toggle in to hold the disks in the engaged position until you use the clutch lever to pop the levers out of engagement. I have adjusted the collar back and forth, but no firm engagement or toggling happens. Also, the other clutch will work its functions, but only if you put a lot of pressure on the lever, but it will not toggle in, either. The friction wedges look to be the same thickness on both clutches, they look like they shouldn't be worn down enough to slip, but manual doesn't say how to tell.
Does anyone out there know if the 3 internal toggle levers and/or rollers can wear enough to cause slippage and lack of toggling? By the way, one mechanic said he believed these clutches were very similar to those on the Bucyrus-Erie 20-B cranes. Any help would be greatly appreciated.
