Chainsaw Repair

Quote from: hotshot on December 10, 2013, 03:22:07 am

First post here, but the small steel cam gets driven from the shaft by the
"crush" when you tighten the clutch assembly down against the cam, or in
other words it is stacked in there like a washer being pressed against the
crankshaft journal. 

What a great engineering design, with the brass gear reducer cammed in a
roughly a 19 to 1 ratio.  There are 19 teeth on the brass driver, and 20
teeth in the stator. Note that one of the gear tooth pockets on the outer
gear is always empty. The face of the brass driver gear has a short cam
cast into it too, that the cross piece button rides on.

One turn is made to stroke the plunger for every 19 rotations of the engine, or
about 5 short plunger strokes per second at 6000 RPM.  Looks like the designer
must have played with his kids Spirograph drawing set back in the 70's, if you
remember those.

Anyway, you probably have a quad ring rubber seal that is simply worn
out, it goes around the plunger pin that is actuated by the cross shaped
piece that is driven by the face of the brass gear.  You have to dig it out of
the bore with a dental pick, at least most of the time you do.

Hello, and welcome hotshot...I don't suppose you know anything about the oilers on the PP295, 4620AVL's  do you?  I own a 295 that runs/oils great, and I bought a 4620 that runs great, but does not oil to save it's "you know what" anyway, just looking for some more insight (I've replaced the oil pump with no luck), thanks, John.

I believe once you remove the oiler on those that there is a small rubber tube that runs into the oil tank.   You can just pull it out and make sure it is not plugged up.   The only other thing to look at is the worm gear and make sure it is engaging the oil pump correctly.

I have 3 of the Poulan 295's. 

Yes there is a tank vent for the oil tank.   It will not draw oil unless it is vented.

The other thing I have done is this.    At the end of the oil pump is a small hole.   You should be able to rotate the pump by hand and see a small piece inside move past the hole.   This will at least tell you if the pump is being turned by the worm gear.  Remove spark plug first.

It has been awhile since I worked on mine so I hope I remembered right.

If you have the two piece rubber pick up that the oil pump fits into that's likely your problem.
The rubber swells and the pump will sit at an angle and not seal causing it to suck air.

On the IPL they would be these two parts

40. 530019174 Seal--Oil
41. 530037057 Pickup--Oil

To correct the problem Poulan produced a one piece pick up to replace the two piece unit.
It will set you back less than $2.00
The part number of the one piece unit is.
545047801

Gentlemen I split this topic off from the 306A oiler thread.  This topic serves everybody better as its own thread.  Lots of good info to help folks with the PP295/4620 series saws. 

Thanks to all that contributed here, including the gentleman who posed the first PP4620 question. 

I have a PP295 on the way, and am glad to see the oiler info for that series here in case I need it.  Thanks Tim for the part #'s.

Yeah, my saw has definitely left a mess everywhere before, until I started flipping it over to store it...I guess now I have a better idea what to do about it.  Thanks again.