028 oiler meltdown

[Dan Forsh]

Just took delivery of my latest 028 today. Seller said it had been running a little rough lately...... a little rough, yeah right.

Felt extremely hard to pull over, an optomist would have thought it had great compression, but I'm not so I delved a little deeper.

Still tough to pull even with the plug out so I started to suspect the worst. Rather than go straight for the muffler I stripped down the clutch side.

Pulled the plastic cover and found the plastic gear wheel that is attached to the oil pump to be melted pretty bad. Pulled the clutch bell and the bearing disintergrated. The needles all looked blued from heat. Are these in a plastics casing?

My question is, assuming all else is okay, will I get away with a new clutch bearing and new drive cog? Looking at the IPL I'm not sure I understand how this set-up works. Is the deceased plastic cog driven directly by the spur sprocket?

I will post some pics just as soon as the camera batteries have charged.

Dan

 

[Dan Forsh]

Some pics of the problem.

I've done a little searching and now I'm thinking that there should be another plastic gear on the spur that is either missing or has totally melted?

I'd really appreciate some input here guys.

Dan

 

[JONSSTIHL]

I'm not familiar with the exact configuration of an 028 but I think you still better pull the muffler because the oil pump only turns when the chain turns so I don't think the melted gear is causing the resistance you feel when trying to crank.

hope you can fix it

James

 

[Dan Forsh]

I have since pulled the muffler and the piston looks okay, only a little light marking. I think that the resistance was due to the clutch bearing having given up and seized. haven't got the pull start on at the moment, but it turns over easy enough now by hand on the flywheel.

 

[HyTech]

I'm new to chainsaws, haven't had my MS280 running yet, but feel I can add something here.

I had to replace my clutch drum needle cage and the replacement was metal, not plastic like the original one that came on the saw. Sure glad to see that.

Sorry I can't help with your oiler problem as mine is different.

 

[Lakeside53]

The gear that is mounted on the clutch drum is missing, and the other gear is is bad.

Cleaning it all up (removed molten plastic) and replacing both gears should fix the problem.

Check your drum bearings and clutch springs while you are in there.. a burning clutch is the likely cause of the gear failure.

 

[stihltech]

meltdown

Slipping clutch=meltdown.

To dull, pushing too hard, knocking the revs down too far melt the bearing cage and the pump gears.
I am all for plastic cages. If it melts, you know you are doing something wrong.