Hanson Hydraulics Ltd. Blog

Difficult to repair hydraulic cylinder

Posted by Doug Hanson - 26/04/10 at 07:04 pm

Written for Hanson Hydraulics Ltd. Blog: Here is a not so easy “quick reseal only” hydraulic cylinder repair.  First step was using an industrial sized face spanner with 12′ of pipe, didn’t budge. Heated the barrel up around the gland, didn’t budge.

Next step, build a socket to fit the hydraulic wrench. Started with two sector rings. Used the holes in the sector rings as a jig to drill and tap the face of the gland.

The hydraulic wrench drives the socket below, which is welded to the two sector rings

This one took about 5000 foot pounds of torque to break loose.

Getting it back together again is also a little tricky. The large piston seals have to get past the threads at the front of the barrell. This requires shim stock.

Cut a piece of shim stock to a length to match the appropriate circumference.  Then cut fingers into it, leave the portion that will cover the threads uncut.

Place the shimstock in the barrell, covering the threads, but be sure that it does not stick in the bore past the threads, or the piston will drag it in.  Use duct tape to secure the shimstock to the outside of the barrel.

Grease up the pistons seals, and work the piston into the shim stock and into the bore.

They can’t all be easy.

 

 

 

 

 

 

 

 

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This entry was posted on Monday, April 26th, 2010 at 7:02 pm UTC and is filed under Hydraulic Cylinder Repair. The entry is tagged under You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.