PM66 - was hard to raise/lower blade - now all clean - reassembly sequence?

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Forum topic by bikesanddogs posted 07-30-2013 06:20 AM 947 views 0 times favorited 2 replies Add to Favorites Watch
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3 posts in 1755 days

07-30-2013 06:20 AM

Topic tags/keywords: pm66 reassembly trunnion sequence

FYI – Picked up a 1990 PM66, low miles but sat unused in a garage for the last 10 years. A spritz of silicone spray got the tilt wheel gliding nicely but the raise/lower wheel was STIFF. Took everything apart – top, motor, trunnion out (thing is HEAVY) and found the shaft had congealed junk on it. The PO had used some kind of grease which had worked its way down into the shaft housing and turned into viscous paste. Also filled the teeth of the tilt/raise mechanisms with gunk. Pulled the main bearing shaft to clean it too. All is now shiny and going back together. Any wisdom on the best sequence to reassemble the main bearing shaft and the raise/lower mechanism? My guess is: Unbolt teeth from tilt/lower part. Drive in Main shaft. Put in raise/lower shaft. Then bolt on teeth meshed to worm drive on raise/lower shaft.

Anyone with practical experience doing this who has a better suggestion for assembly sequence please share.

The arbor spins nicely and the belts look brand new but I suppose that I should replace arbor bearings and belts while everything is in pieces…....


Millo – DIYer – who is slowly upgrading my tools

2 replies so far

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278 posts in 2289 days

#1 posted 07-30-2013 09:07 AM

That greasy gunk is probably just “cosmoline” that was sprayed on there to prevent rusting of exposed metal parts. They came shipped this way. Maybe the machine was never used?

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3 posts in 1755 days

#2 posted 07-30-2013 01:56 PM

Thanks for reply. It was used some as the teeth on the tilt/lift mech were clotted with a sawdust/grease substance that I scraped off, tooth by tooth, with dental picks I scrounged from my last trip to my dentist. Even after removing the main shaft so that only the raise/lower shaft was in the trunnion with no teeth to engage I could still barely turn the shaft due to binding from the gunk. I broke my dental pick trying to pry out the key in the slot that locks the lift mech in place – that’s how firmly the gunk bonded metal together.

Once apart I cleaned the shaft and sleeves with brake cleaner, then a scotch pad with WD40, dried it off and sprizted silicone spray in before assembling. Now spins free and easy. Still trying to determine best reassembly sequence for main shaft and lift mech…....

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