(upbeat rock music)
- Hey, everyone, Sam Battersby from Griot's Garage,
and today, we're gonna talk about
how to service your backing plate
and brushes on your G9 Random Orbital Polisher.
To start, put the polisher on its back.
Get it ready to take the plate off.
We will start with the backing plate
and then, we'll move into changing out your brushes.
The G9 comes with a nice little kit that includes
everything that you need to change
your brushes and backing plate.
It also includes a manual for the G9,
which has instructions on backing plate
maintenance towards the back
and everything else you need to know
about your new polisher.
It includes the backing plate wrench, which is now branded
and labeled, so that it's less likely
to get thrown away, hopefully.
Do not throw that wrench away,
as a normal 14-millimeter wrench is too thick
to fit between the backing plate and the shroud,
and It won't work for taking off your plate.
And it also includes your brushes.
These are normally in a plastic bag,
just removed them from the bag for the video,
but these are your two replacement carbon brushes.
Cool thing about the G9 brushes is they have this
little wear mark on the bottom that tells you
when the brush is ready to swap out.
We'll talk a little bit more about that in a second.
So take your backing plate wrench to remove the plate,
fit the wrench between the shroud,
and the backing plate, and fit it onto the hub there.
I like to use the plate to unscrew it instead of the wrench.
You get a little more leverage that way,
so I'll thread the plate off, spin it free from the tool.
You always wanna make sure that this nylon crush washer
is present, so if the new plate that you're putting on
does not have one, make sure you swap it
from your old plate to the new plate.
All of our backing plates come
with that crush washer preinstalled.
To install your new plate,
fit your backing plate wrench over the spindle
and take your stud and insert it into the threads.
Be sure not to cross-thread it.
I'll get it started
and then, holding the spindle in place, go ahead
and spin it on until it's tight.
Once tight, give it an extra quarter turn
and then, you're ready to go,
so that's your backing plate maintenance.
And we do offer five-inch backing plates
with the G9 as well, so you can run either a five
or six-inch, or if your plate is worn out from wear and tear
and needs replacement, that's how you're gonna do it.
So now, for the brushes, great thing about the G9
is it has the quick access brush ports,
which make this job very easy.
It's not necessary to disassemble the rear
of the tool at all like you
have to with many random orbitals.
You're gonna want a flat blade screwdriver for this.
Go ahead and insert that into the slot on the brush cover
and thread it off.
Pull your old brush out.
Again, you have that little hole,
which is a wear mark at the bottom.
Once the brush has reached, that it is ready to replace.
There's not always gonna be an indicator
until the brush is completely worn out
and there's no way to necessarily give an exact duration
to how long your brush is gonna last
because many variables factor into that,
including how long you're running the tool,
what speed you're running it at,
how much pressure you're using, and so on.
The best way to tell if your brushes are wearing down
is normally when the tool either
shuts off intermittently or won't power on.
Check the brushes first
before you try to replace the orbital.
That's usually the cause, so we'll grab our new brush.
Slide it in there.
You wanna insert the blades of the brush
into the flat spots of the brush port
and then, I'll take my brush cover
and simply slide it over the brush as I have it pressed in.
That helps keep it in place
and then, thread the brush cover back on.
Be sure to not over tighten that.
You really only want it finger tight.
Being that it is a plastic composite cover,
it can crack if you torque it down too tightly.
Now, repeat that exact process for the other side.
You always wanna replace both brushes at the same time,
just like you would with brake pads.
If you only replace one side, you're gonna have issues,
so always replace both sides all at once.
That's how you service your backing plate
and brushes on your G9 Random Orbital Polisher.
For more information on the G9 Random Orbital Polisher,
please visit griotsgarage.com
and as always, have fun in your garage.
(upbeat rock music)