The power of a grease gun....... lesson learned.

[Arrowhead]

A couple weeks ago I bought a Jred 490 parts saw off ebay. The seller said it had good comp. It was a gamble, I thought if it had a good P/C it would be worth the $33 I payed for it. Well when it got here, there was no plug in it and it was locked up tighter than a drum. :bang: It was obvious it sat outside awhile with no plug. I thought it was prolly froze up around the rings. The piston was close to the top of the cylinder. I made up a grease fitting to fit in the plug hole. (old plug with a zerk welded to it) This usually works good for unseizing a saw if the top of the piston is above the ports.

Well............ I should have removed the jug bolts first. I kept pumping the gun thinking I'll break it free. There was so much pressure it popped the bottom of the cylinder off. :bang:

What sucks is the piston and cylinder was perfect! The bearings were froze up tight. I could not even get the rod to move at all on the crank. If I had removed the jug bolts, it would have lifted the cylinder right off the piston. The seller did make it right, so basically I have only a few bucks in the saw. I did get a good piston out of it.

 

[Jacob J.]

What really sucks is that those jugs are hard to come by.

 

[mtngun]

That sounds like something I would do.

Was the piston frozen at or near BDC ?

 

[madhatte]

Old-timer gearhead I learned a lot of tricks from showed me how to pull the brass bushing from an automotive flywheel using a similar but cruder trick. All you do is pack the space with grease, fit a dowel of approximately the same diameter as the bushing, and whack it a few times. The bushing will walk out onto the dowel. It works every time!

 

[HILLBILLYREDNEC]

Wow

Never seen that one, That sucks to ruin a nice jug :msp_sad:

 

[Arrowhead]

What really sucks is that those jugs are hard to come by.

I know, I about cried once I seen it was flawless.

That sounds like something I would do.

Was the piston frozen at or near BDC ?

The piston was close to TDC.

 

[Modifiedmark]

Doh! :bang:

That appears to be the same kind of thing that I have the knack of doing!

I know a good welder..........

 

[heimannm]

Extremely disappointing indeed, but WOW what a lesson in the power of high pressure grease.

Mark

 

[Roanoker494]

I am not going to lie, I just cried a little bit.....

Makes you wonder if there may have been a crack in the area to start with.

 

[Chris J.]

Do you usually loosen the cylinder bolts? I do.

I saved a "seized" 621 P&C by removing the cylinder bolts, using a little Kroil, & having some patience. The saw had been used as a donor, I'm guessing that someone wrote it off as seized.

 

[atvdave]

Grease Guns can produce more than 10,000 psi.

 

[Nardoo]

And I thought I had cornered the market for dumb.

Naw, on second thoughts, I would have used a 4lb hammer and broken the piston as well.


Al.

 

[KD57]

Grease Guns can produce more than 10,000 psi.

And yet, there is always one zerk that won't take grease on a piece of equipment I am working on. And it's usually the part that needs it the most.

Sorry about the jug.

 

[Simonizer]

Grease Guns can produce more than 10,000 psi.

Yes, 10000 psi on a 50mm diameter piston produces a force of 15.2 tons. Yikes.

 

[cmsmoke]

Why did the seller make it right? Were there other issues?:msp_unsure:

 

[demographic]

That sounds like something I would do.

Was the piston frozen at or near BDC ?

It must have been above the exhaust port otherwise it would have let the grease out of the exhaust port.
Err, I think.

 

[67L36Driver]

Tapered bore change gears on some machines at work had a zerk at the end of a drilled hole connected to passages on the tapered surface of the shaft. Remove retaining nut, pump the grease gun and the gear slid right off. Slick.

 

[Dennis Gauge]

Why did the seller make it right? Were there other issues?:msp_unsure:

It was sold with "good compression."

 

[cmsmoke]

Exactly

 

[Cstratton]

It was sold with "good compression."

It had good enough compression to push the whole damn jug off! What more can you ask? Just kidding. That sucks to lose a good hard to get part like that.