Newport lab jack--how to disassemble and fix?

Chris S. · Post by **Chris S.** » Fri Feb 11, 2011 11:22 pm

Since folks I respect on this forum have recommended Newport lab jacks, I just purchased a used Newport 281 lab jack. Wow! A really solid, rock stable item that will be a great addition to the Bratcam.

However, I find that turning the adjustment knob on this unit is extremely difficult. My first thought was that the the grease has polymerized, and indeed, under good light, I can see green gunk in the threaded rod attached to the adjusting knob.

I presume I can fix this by disassembling the unit, cleaning the threaded rod in solvent, and then greasing it with proper grease. But disassembly is not obvious—so before I start blundering about, can anyone with more knowledge give me any advice? How does one remove the threaded rod? What is a good solvent for cleaning the threads? What is a good type of grease for applying to the rod after it is clean?

This is not my own unit, but a file photo of the same model:

In advance, thanks!

--Chris

SONYNUT · Post by **SONYNUT** » Fri Feb 11, 2011 11:32 pm

lighter fluid will soften the grease

Len Willan · Post by **Len Willan** » Fri Feb 11, 2011 11:48 pm

Chris,

I would try a good quality heavy duty clock oil (MOEBIUS 8141) on the threaded screw ,at both sides,and then tap the object lightly,for the oil to run, later on try turning the knob,it should "free up".

Then you can wash it with a Hydrocarbon solvent,"Shellite and X55"are brand names down here.

After washing and drying, you can re oil the thread lightly.

I would avoid using a grease.

AndrewC · Post by **AndrewC** » Sat Feb 12, 2011 12:26 am

Taking apart is quite easy if you decide to do so - just take off the top or bottom plate and it is self evident. Putting back together is oly slightly more difficult.