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Tool Talk Discussion Forum

Pro Mac 610 Chainsaw Oil Pump Problem

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Wayne Mo

05-13-2006 21:07:22




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I have had 3 McCullough Pro Mac 610's and all had problems with the oil pump quitting. I took them apart and cleaned everything and blew out all the passages, nothing helped. The oil pump is a plastic body and seems simple enough but I cannot figure out what is failing. There is a diaphram that is actuated by running compression for automatic oiling and it is controled by a screw which is supposed to regulate the flow rate. There is a manual piston operated portion in the pump and it appears that the valving for manual operation is not working right to provide suction and pressure as you pump it. The saws work great except for the oilers! Has anyone else figured out how to fix them?

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jeffcat

05-16-2006 10:09:42




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 Re: Pro Mac 610 Chainsaw Oil Pump Problem in reply to Wayne Mo, 05-13-2006 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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Butch(OH)

05-15-2006 09:32:26




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 Re: Pro Mac 610 Chainsaw Oil Pump Problem in reply to Wayne Mo, 05-13-2006 21:07:22  
Jeffcat has the 610 science down pat. People sure go through a lot to save having a $1 paint brush in the saw box and spending 10 seconds using it before adding fuel and bar oil. Even with a clean sump and pump some saws wont pump the super bar lube goo and there is no saw or chain brand that likes goo in the tank better than lube on the chain. In other words if your saw wont pump it in sufficiant quantities, it aint no good for bar oil period. If it means anything I have never bought "bar oil". When we had drums of 30 wt motor oil in the shop that was bar oil, when we had 15-40 that was bar oil and I have never seen ill effects as a matter of fact that was the reccomended oil for the older Echos. I have several 610-650 Macs myself and the 610 I bought new in 1976 has never had pump problem one so it can be done, clean and correct fluid. There are new pumps on an Ebay store right now for about $10 shipped to your door, can supply link if need be.

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jeffcat

05-14-2006 09:35:51




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 Re: Pro Mac 610 Chainsaw Oil Pump Problem in reply to Wayne Mo, 05-13-2006 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

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Wayne Mo

05-14-2006 21:37:51




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 Re: Pro Mac 610 Chainsaw Oil Pump Problem in reply to jeffcat, 05-14-2006 09:35:51  
Thanks for the detailed explanation, I think you hit the nail on the head. When I disassembled the latest saw I bought, it had thinner oil in it and I did see some action at the discharge hole when the saw was running without the bar attached. Then I cleaned the tank and put in new sticky oil and I got nothing out the discharge hole. Then though I blew thru the 2 holes in the body ok....but I could not blow thru the oil tank hole so I gave it a shot of air pressure and blew oil out the filler cap big time! I might have blown off a hose inside the tank. I did not know there was one in there or a screen either...how can I tell if the hose is blown off? Also why can't you remove the ball check and clean the internal passages of the plastic pump body? I am glad to find someone so knowledgeable on this saw and would like your email address for future questions!

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twine

05-14-2006 10:02:48




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 Re: Pro Mac 610 Chainsaw Oil Pump Problem in reply to jeffcat, 05-14-2006 09:35:51  
Jeffcat Just wondering the oil for chain saw chain oiler is that straight wt 40 oil or is it 10 -40 wt oil? thanks



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Bob M

05-15-2006 04:44:54




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 Re: Pro Mac 610 Chainsaw Oil Pump Problem in reply to twine, 05-14-2006 10:02:48  
In hot weather the commercial bar oil works OK in my 610. However below about 50 deg I gotta use 10W30. And when temperatures are in the single digits 5W30 works best.

Alternatively, under cold conditions commercial bar oil cut with mineral spirits (1 to 1-1/2 cups per gallon and mixed thoroughly) does the trick.



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evielboweviel

05-14-2006 05:24:11




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 Re: Pro Mac 610 Chainsaw Oil Pump Problem in reply to Wayne Mo, 05-13-2006 21:07:22  
nope
have the same problem Ron



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