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Bobcat 773 Auxiliary Hydraulics

A

Andy Martin

Well-known Member
Today my grapple started closing between loads. It started getting worse within an hour, the grapple will close in about three minutes under gravity. It also does not seem to hold pressure on the closed position. I'm trying to follow the hydraulic schematic, but need some help. I figure it is not a worn spool or it would not get worse quickly. I'm hoping it's debris in a relief valve or an internal o-ring leaking. It's got about 2,400 hours on it, with a Kubota diesel.
 
Thanks, two grapple cylinders, and the grapple was new this year. I'll check, perhaps I blew the piston seals out of both.
 
Good point, thanks. I really wasn't thinking that through. I plan on opening it and unhooking the quick disconnects first thing tomorrow to check that. I like this forum! Since they are new, I hadn't even considered a bad cylinder, but I've been working it pretty hard and probably have been loading one cylinder with a bigger load on one end than the other.
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It is easy to check the cylinders. Just open or close the grapple all the way. Then remove the non pressure hose from one cylinder when it is working in that same direction. Then try the cylinder against the end stop in the direction you chose to try. If you get a steady stream of oil out of the cylinder fitting then it is that cylinder leaking. If you get a stream out of the hose then it is the other cylinder leaking. So you can find which cylinder is leaking pretty fast/easy.

PS" Is it not amazing what you can move/clear with a grapple bucket????? Mine gets used more than the regular bucket many weeks.
 
It amazes me how much I can grab with the grapple. One cylinder seems to be a dead short. 7 months out of a 1 year warranty, all they want is a picture of the leak, so I'm going to send them a picture of the cylinder.

Thanks for the help. It just never occurred to me that a new cylinder would be bad, compared to a 20 year old tractor.
 
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