Hanson Hydraulics Ltd. Blog

PVG32 Actuator Seal Fix

Posted by Doug Hanson - 09/09/09 at 07:09 pm

Want a good seal for your PVG32 actuator?

Hanson Hydraulics Ltd. Blog article:

Sauer Danfoss PVG32 PVMD actuators (used on Waratah Processors), have a u-cup sealing the actuator shaft to the housing. It has been my experience that this seal is not included in the PVM seal kit. Waratah has created a seal kit, however it has also been my experience that it contains the wrong u-cup. The u-cup required is a metric size. – 11mm x 17mm x 3mm which is hard to find. The u-cup supplied in Waratah seal kits I have found is 11/16 x 7/16 x 1/8, close but not close enough. They will start leaking in short time.

 Here is a repair to replace this hard to find u-cup with an oring.

 Remove the nut from the housing. The oring on the outside of this nut is a 21.2mm x 26 x 2.4 oring and in this application could be 70 durometer. Remove and inspect the shaft for wear or grooving.  Have a look inside the housing, older housings had a tendency to crack. Remove the u-cup with a pick, being careful not to score up the sealing area.  Once the seal is removed, insert a blind hole bearing puller and expand into the groove, making sure that the tool will not gouge up the seal area.  Press on the tool to press the busing out the bottom of the nut.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Machine .075” off the face of the seal side of the bushing (not the shouldered side). This creates a seal groove .190” tall, perfect for a 2 series oring (205) 70 durometer. Press the bushing back in, pop in your oring, install the shaft, tighten the nut back up and you’ve got an actuator/spool cover that should be leak free for a long time.

The orings that seal the face of the housing against the valve body are: 5mm x 9mm x 2mm

 

 

 

 

 

 

Written for Hanson Hydraulics Ltd. Blog

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This entry was posted on Wednesday, September 9th, 2009 at 7:09 pm UTC and is filed under Hydraulic Valves. 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.