Lubricating a Delta 31-396 Oscillating Edge Sander

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Forum topic by BCL posted 08-07-2017 12:25 AM 1327 views 0 times favorited 2 replies Add to Favorites Watch
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2 posts in 895 days

08-07-2017 12:25 AM

Topic tags/keywords: gear box machine oil oil port oscillating edge sander delta 31-396 question

Hello LJ,

I’ve inherited the subject belt sander and was inspecting it the other day. I’ve come here looking for advice, since help from Delta does not seem to be available…

The manual says I should fill the gear box with machine oil—nothing about capacity and type of oil. The research I’ve done shows most take 80-90W gear oil. I can find some at the local auto store, but these are multi-grades and has detergents. E.g., 80W-90 and 75W-140. I am assuming I need straight 80W or 90W with no detergents, but I cannot find any.

The grease fittings will not accept grease. My research indicates heat could help. Has anyone had a similar experience?

Lastly, there are a couple “oil ports” which look like skinny grease fittings. I’ve never seen anything like these. Can I use just a simple pump oil can? The tips on the oil cans seem made for a ball port, and the ports on the sander are clearly different. The manual just says to oil them. Duh. What weight and type oil would be used here? I have found some straight 30W non-detergent oil in town; will this work?

Thank you in advance.

2 replies so far

View BCL's profile


2 posts in 895 days

#1 posted 08-23-2017 09:44 PM

Well, no replies yet, but here’s an update:

Delta has been of little to no help. Evidently, they moved recently and only 1 member of the tech staff decided to move also.

I bought a new grease gun and was able to grease the fittings, although the grease went in reluctantly on a couple zerks. I used Mobilith grease, which is a mineral based lithium complex grease.

I still have not heard whether I can use automotive 80W-90 gear oil in the gear box. Still waiting on Delta to reply.

And the oil ports are still a complete mystery. They are too small to be a grease fitting, and a standard pump oil can will not mate either.

View Loren's profile


10477 posts in 4250 days

#2 posted 08-23-2017 09:51 PM

I use outboard motor oil in gearboxes. I
think I saw it recommended in a manual
for a machine I owned. YMMV.

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