Re: Pro Mac 610 Chainsaw Oil Pump Problem

Posted by jeffcat on May 14, 2006 at 09:35:51 from (216.107.36.112):

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

This has come up a few times and I will give the same answer.
The pump will need to be replaced cause the little check ball inside of the pump is cruded up. The Ebay saw page has them listed almost any day for about $20.00. Now here is where I tell people what I have found is the cause. This is what several Mc Culloch repair shops also say. Do not use the heavy sticky bar oils! They say to use 40wt motor oil. It flows beter and doesn't strain the pump. I have over 40 different McCulloch saws and 40wt works just great. That "bar" oil realy raises He--l with the older saws cause it blows out the "O" rings. Replace the gasket under the pump too. While you have it apart take a little plastic hose like saw fuel line and clear the three holes in the saw body. Set your breath down to about two pounds of pressure. Take off the bar and make sure the hole blows clear. With the hole clear next is the oil resivour. Take off the cap and see if your oil bubbles. If you use too much air you will blow off the hose. Then you will need to disasemble the saw to hook it back up. TAKE GREAT CARE! I wash out the oil tanks with a little Kerosen and make sure that little screen is clean. You can"t beleave how much saw dust is in them. The other hole goes to the crank case and should hiss through the exhaust muffler or the carb. as you turn the fly wheel. When you get the new pump DON"T MESS with the set screw! The pump should just about empty the res. with a full tank of gas. To increase oil flow turn the screw counter clock about 1/2 turn. Cut more wood and when you get it set righ put a dab of lock tite on the screw. This is a realy good thing to set and your saw will work much better. I have six 650 saws and about twelve 610 saws working and a couple in parts. I go from mini 35, 33,35,39,I-40,I-43,I-44,-I-50,250,940,PM-100,and several Mall saws with one two cyl. Dillon KB-7. Yes it got way out of hand as a hobby. Lots of fun to take them to small motor shows though. So many people remeber ther dad or unkle had one of those! The Diston KB7 is the late version from 1948. It is two pistons of 14 HORSE POWER! Think you know how to handle a saw ????? OK I got a little long here but change the pump and check out your saw. You have a good beast there. Jeffcat

Replies:

• Re: Pro Mac 610 Chainsaw Oil Pump Problem Wayne Mo 21:37:51 05/14/06 (0)
• Re: Pro Mac 610 Chainsaw Oil Pump Problem twine 10:02:48 05/14/06 (1)
  • Re: Pro Mac 610 Chainsaw Oil Pump Problem Bob M 04:44:54 05/15/06 (0)

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