McCulloch Chain Saws

Arborist Forum

Help Support Arborist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Hey guys, I picked up a decent PM 850 recently and was wondering if anyone in the group has a handlebar (92707) that still has the padding on it (mine is pretty rough). Also looking for the frame brace grommet 93032. These are a few things I can see on the surface to get me started, I'm sure there will be more.....
 
Thanks Mark - I like those grommets - I don't really care if they are original or not - just need the functionality.
Send me a PM - I'll get some of those from you.
As far as the bar goes, I have some EPDM tubing that I have used on other 10 series saws, a pain to get on (I use compressed air), but seems to work pretty well. I'll probably go that route with the 850.
 
I went through another batch of flat back primers today. It is always a very messy job with the leftover goo from the cup seals.

20250212_134025.jpg

For those that haven't seen the process, I start by drilling a small hole in the end so I can press the works out. I use the peck drill in the lathe for better feel when it goes through.

20250212_113336.jpg

I made a simple tool to use in the arbor press for taking them apart. Since the body is 1/2" square I hold them in a 1/2" drive deep socket while pressing the innards out.

20220708_135045.jpg

To seal the hole in the back end of the primer I tap the hole I drilled and install a small set screw.

20220708_165951.jpg

Once the parts are cleaned up, I install a new cup seal and new o-rings. To get the parts pressed into the correct location (depth) I made a couple of tool to use with the arbor press.

20220720_085859.jpg

I use a can with Seafoam to test them and make sure they actually pump; Seafoam is a bit oily and doesn't smell as strong as mixed fuel and is not too hard on your skin.

20220709_072431.jpg

I also pressure test them to make sure they hold 10-15 PSI.

20250212_140341.jpg

Mark
 
Back
Top