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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Re: Help..Hyd. cylinder repair$$$

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08-06-2013 18:56:04

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I would get the rod straightened first. A shop that knows what they are doing will not damage the shaft. Then bore out the end for the next size larger bolt. then tap out cut the new threads in the lathe. Boring will give you a much straighter hole and better size control than a drill. Bore out piston to fit new bolt. Get an L9 or similar high strength bolt, use fine threads. The bolt will be much stronger than the shaft so the thread length should be a least 1 1/2 times the bolt diameter. Be sure to torque the bolt to manufactures spec. Properly torqued bolts don't come lose! Under torqued ones do! Lock tight is ok but is not substitute for torque!

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Stick welding

08-06-2013 20:59:26

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 Re: Help..Hyd. cylinder repair$$$ in reply to DGH, 08-06-2013 18:56:04  
Have to disagree that properly torqued bolts can't come loose. Some applications call for loctite no matter how tight you put them. Sprocket bolts on high performance motorcycles are one example. Some guys use the red loctite on them. Have seen many a broken hub from the bolts coming loose without loctite. I don't know if this cylinder has ever been apart for new seals but if it was may explain the bolt pulling out or coming loose. I have thought about using the next larger size bolt but I'm not sure what size the original bolt is. It's got to be pretty big for a 4" bore cylinder though. The stick on a backhoe has nothing to stop it except the cylinder piston. There was no o-ring on the bolt and if it was just a tad loose could cause enough oil to leak that it creeped.

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