Re: Pro Mac 610 Chainsaw Oil Pump Problem

Posted by jeffcat on May 16, 2006 at 10:09:42 from (216.107.36.31):

In Reply to: Pro Mac 610 Chainsaw Oil Pump Problem posted by Wayne Mo on May 13, 2006 at 21:07:22:

Glad you could use the information. Straight motor oil from the car-parts store. The 30wt stuff you use in your lawn tractor is next to the 40wt stuff. ClEAN motor oil is what you want in your bar oil tank, not drain oil. The little ball in the pump has a tiny spring behind it and very small particals will jam it. Thus crud from drain oil and tiny amounts of saw dust fines. The lite oil "40wt" will let these pass around the ball and not plug up the pump. Sometimes if you still have a little pump action left. Try runnning straight kero in the tank for a run of just trimming little branches. If the ball can move at all it just might loosen up. The pump is pinned together. Doubt you could fix it cause everything is pretty busted up by the time you get it apart. If you blew the hose off you can look into the tank with a flashlite and see it floating around. A little wire with a hook in the end will allow you to gently pull the hose up and down. This way you can get at the metal end screen and see if it is pluged. There is a little nipple just under that hole in the saw body where the hose slides on. BOY do I hope you didn't blow it off! After you take the side cover and bar off, then the recoil and then the left cover, then the muffler, then make a real thin cut down open end wrench to get out the four #10 bolts, you can get the front tank off. Next put the hose back on the little nipple. Now clean the metal surfaces and apply a dab of blue valve cover silicone. Reverse coarse. About 1 1/2 hours of work later. I know HA-HA but do be careful with the little hose. Also you will NEVER let any saw dust in your tank again! Keep a clean rag around and wipe away from the sides of the hole.
The 610/650 saws,Timber bears are the same thing, were the last of McCullochs real heavy saws. Made up to the very end in 1999. Two years ago I bought a 610 at the flea market for $30.00 and found that it wouldn"t run cause it had bar oil in the gas tank! Great runnig saw after I cleaned it out! If any other problems give a shout! Jeffcat

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