262xp Metal oil worm gear removal

[Sierradmax]

Tearing down a 1994 262xp and I came across a metal worm gear on the oil pump. It appears to be pressed on and not like the brass or plastic piece you typically see. Any pointers on how to remove?

 

[firefighterwolf]

I've sent an email. This is about the fourth time I've tried uploading a photo of a puller I made for those. Hope this works.

Anyway, the gear is more-or-less 3/4" pipe thread. I used a 3/4" black iron female x female coupler with a piece of pipe threaded on one end and a nut tack welded on the other. I didn't measure the length of the pipe....maybe 2" including threads? It just needs to be longer than the pto end of the crank when threaded into the coupler. I think it is a 1/2" or 9/16" bolt...doesn't really matter, that pushes on the crank as the coupler pulls the worm gear.

 

[Agrarian]

Or you can avoid the welding and screw a iron pipe coupler on and use a gear puller on the coupler.

 

[Agrarian]

Your saw must have been made in the first half of 1994 because they changed to the plastic gear driven from the clutch in June of that year. I'm guessing your serial number begins with something in the range of 401 to 422??

 

[Sierradmax]

I don't have the saw in front of me. I think it has the brass worm gear, just a metal washer covering it. Difficult to remove. Does the oil pump on the 262's w/ brass worm gear have to be pushed (not pried w/ screwdriver) using two M5 bolts threaded into the oiler body?

 

[Agrarian]

Yup, that's the best way and is what the threaded holes are for. You use the same bolts that hold it in place.

 

[kz1000]

Well done and thanks to all, I was going to ask the same question about the brass gear.

 

[Sierradmax]

Got it removed last night. Thanks for everyones help. Now which one should I re-use? Brass/internal (constant oil supply even when idle) or plastic spun by the clutch drum?

 

[Agrarian]

I have always replaced mine with the newer clutch driven approach. My saws may sit idling in the woods while pulling brush and I don't like the oil puddles the earlier design creates.

 

[Mattyo]

sorry for the thread revival here, just did this job last night. the worm gear fits 1/2" NPT .... not 3/4" NPT.

I used a piece of black pipe union and a ball joint puller and it worked fine. i'll get a video of it eventually... its all on tape

 

[Mattyo]

oh, and in case anyone might be wondering, its also 7/8" - 9TPI for a tap or die size .... at least that's the die that I had that fit on there

 

[Tor R]

sorry for the thread revival here, just did this job last night. the worm gear fits 1/2" NPT .... not 3/4" NPT.

I used a piece of black pipe union and a ball joint puller and it worked fine. i'll get a video of it eventually... its all on tape

perfect timing since I also need to make one. Looking forward to see your video.

I checked the crankshaft, think I would like to see the puller lenght around 60mm, is that also your opinion?

 

[Mattyo]

Hmm...didn't do much measuring. ..I'll get some photos

What I might do is try to make a device for this purpose without a welder and without a formal puller...I have some ideas

 

[nmurph]

...and you can heat the gear and it will drop right onto the crank.

 

[Mattyo]

Had I used a 1/2" to 1" coupler this might have been fine...but the screw portion was too short...so i had to use sockets to take up the space

 

[Mattyo]

The 1/2 " to 3/4" bushing is what gives the device too much lenths for this puller

notice I ground on the coupler to give the puller grip

 

[Mattyo]

Hope this helps someone

 

[Mattyo]

Thanks nmurph. ..I was wondering. ...

But I may convert to the plastic worm gear...I dunno...

 

[Tor R]

Just need to get it confirmed, what is the dimension for the 1/2" NPT?
My oil worm dimension is like 19 mm and 17,5mm

 

[Mattyo]

My gear is stuck inside the 1/2" NPT bushing. so i can't get dimensions until I get a screw extractor big enough to get it out of there! sorry