Author Topic: How to replace Pro Mac 10-10 oil pickup?  (Read 329 times)

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Offline dmccann

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How to replace Pro Mac 10-10 oil pickup?
« on: February 22, 2017, 03:22:48 pm »
I am working on the oiler on my 1982 vintage McCulloch 10-10 saw and have torn it down to expose the oiler piston pump.  I removed the little piston pump (2 screws) and think the problem is the combination oil pickup / wafer check valve seat has hardened and been scratched over the years.  I found a new one, but the problem I am having is how to shove the seat end through the intended hole bored in the oil tank.  The diameter of the seat end of the pickup hose is a good bit larger than the hole it has to go through, and I'm thinking I need to find a way to compress the thing so I can shove it through with brute force and awkwardness, without damaging the seat face.  So far, no luck at all. See pics.

It would be easier to buy a new saw, but this one still runs good and nobody makes a saw built this well anymore.

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Offline pete

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Re: How to replace Pro Mac 10-10 oil pickup?
« Reply #1 on: February 23, 2017, 07:05:34 am »
my only suggestion would be to lube it well and put a string through the hole from the other end loop it around the wider section and pull it through maybe try it with the old one first hopefully Al smith will chime in and help

Offline dmccann

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Re: How to replace Pro Mac 10-10 oil pickup?
« Reply #2 on: February 23, 2017, 07:17:28 am »
I'm wondering if these molded rubber parts have just all become stiffer with age.  No telling how old the replacement is that I found on ebay - probably been sitting in a repair shops parts inventory for 20 years or more.  I'm wondering how they installed these at the factory.  I'm thinking like a tiny version of a piston ring compressor, but maybe it was just more pliable and could be shoved through by hand.  If I can;t get through any other way, I'm considering cutting the pickup tube suction screen off, then splicing back on afterward with a piece of larger tubing used as a sleeve.  I just don't like kludgy solutions!

Offline heimannm

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Re: How to replace Pro Mac 10-10 oil pickup?
« Reply #3 on: February 26, 2017, 08:47:09 pm »
They will go through but it does take a big effort.  As noted, lube it well and try "folding" the flange and poking one side through then grab it with a pair of needle nose pliers and pull it through. 

Be careful that the "flange" thickness matches the one you took out, the older ones had a thinner flange and the later ones have a thicker flange.  The gaskets are different thickness as well so the flange, gasket, even the disk changes over time.  The older ones had the thin flange, thin gasket, and the phenolic disk.  Later ones have a thicker flange, thicker gasket, and thinner aluminum disk. 

With the wrong combination in there, the disk will never unseat and won't allow the pump to pull oil from the tank.


Offline dmccann

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Re: How to replace Pro Mac 10-10 oil pickup?
« Reply #4 on: February 27, 2017, 05:53:53 am »
Thanks for the input. I also noticed there were at least 2 versions of this, since my father had an even older 10-10 from the 1960s, no longer running that I can salvage some parts from.  His was the thinner version with phenolic disc - mine was the thicker version with aluminum disc (Pro MAC 10-10S).  I almost got a thin version through using a technique like you suggested, but not the thick one.  So I finally swallowed my pride and cut the suction hose, put it through from above, then reattached the two pieces with a sleeve of tygon tubing.  I also salvaged a pump push rod from the old saw to put in mine, as the pusher knob had broken off on mine due to "stressful" conditions while using the saw.
Since accessing the piston pump requires a major disassembly, I was a bit concerned that everything might not work after getting it all back together, but I now have a working oiler and it runs as good as before.  I had already been evaluating new saw models for replacement, but nothing I saw on the market was built as well as my old McCulloch, so I'm really pleased that I can keep cutting with it.


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