My Dynabrade 5" sander (57015)is about a year old and has had very
little use, maybe about 10 hours or so. Lately sometimes it won't go
until I manually wobble the disc to turn the rotor a little. The shop
where I work uses Dynabrades exclusively several hours a day and has
never had this problem.
My compressor has adequate pressure and volumn. This is a rebuilt
unit from JKStorm on e-bay.
Have I got a lemon?
Any suggestions? Should this unit be oiled?
Charlie in Kentucky
I have lots of air tools and whenever they fail to spin, it's due to
lack of oiling. Get an inline oiler or remember to oil them more often.
oil for air tools is designed to reduce rust from the moisture in the
air lines. Even HD has the correct oil in stock in their tool depts.
Charlie Campney wrote:
I have a 5" Dynabrade. Absolutely love it. No
more slow electric sanders for me. As for
your question, yes, the Dynabrade should be
oiled, in fact, in should be oiled a lot. Should
have an in-line oiler attached to the hose. If
you've been running w/o oil, you may just need
a good oiling and run through, but be prepared
for a rebuild kit. Good news though, I understand
the rebuild kits are cheap.
On 12 Feb 2004 05:44:54 -0800, email@example.com (Charlie Campney)
I don't know about your Dynabrade DA sander in particular, but almost
ALL pneumatic rotary tools need a bit of lubrication. Typically, one
has a bottle of 'air tool oil' and justs adds a drop or two through
the hook-up/quick disconnect port after use. Larger shops typically
have an in-line dryer/regulator/oiler setup. However, if you ever want
to shoot paint, avoid the in-line oiler. Keeping the air 'dry' also
helps the life of the tool, and IS mandatory for proper paint spraying
From the Dynabrade web site,
3. All Dynabrade air motors should be lubricated. Dynabrade recommends one
drop of air lube per minute for each 10 SCFM (example: if the tool
specification states 40 SCFM, set the drip rate of your filter-lubricator at
4 drops per minute).
Dynabrade Air Lube (P/N 95842: 1pt. 473ml.) is recommended.
4. An Air Line Filter-Regulator-Lubricator must be used with this air tool
to maintain all warranties. Dynabrade recommends the following: 11405 Air
Filter-Regulator-Lubricator - Provides accurate air pressure regulation,
two-stage filtration of water contaminants and micro-mist lubrication of
components. Operates 40 SCFM @ 100 PSIG has 3/8" NPT female ports.
<snip> My Dynabrade 5" sander <snip>Lately sometimes it won't go
got a lemon?
More than likely yes it should be oiled. Double check though in case it
uses teflon seals, then it definitely should not be oiled. But more than
likely it just regular o-rings, and the more oil the better. It is very
important to have dry air going through the tool. Water in the lines will
shorten drastically shorten the times between maintenance.
Your specific problem sounds like their is a problem with the rotary vane
within the sander. If no air is leaking then the rings are fine and if it
spins ok then the bearings are fine. If it has a hard time starting and
stalls easily then the vane is sticking.
This is a very easy fix. Though it can be very difficult to get to the
rotary vane. If you can take apart the sander you will see that their is a
rotating cylinder with a slot in it. Within the slot is the vane, usually
made out of micarta or something like that. This whole assembly spins
within an elliptical opening. You will find this arrangement in most
rotating pneumatic tools as well as within vacuum pumps.
The fix is simple, clean up the goop, and then sand the vane and the slot it
slides in with fine sandpaper until it slides in and out freely. Put
everything back together and then oil well and voila a brand new tool. I
take apart almost every pneumatic tool that I buy used and do this
maintenance. The increased performance can sometimes be extraordinary.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.