BJ 026
Lower
Port Plug
BJ 026
Upper
Port Plug
REMOVE
TO FILL
BC 410
Syringe
WGR 040
Head
WGR
Body
FLUID REPLACEMENT
NOTICE
Improper fluid change maintenance can result in reduced bearing or shaft seal life. Use extreme care
when performing this procedure. The fluid is thick and only very light pressure should be applied to the
syringe. Excess pressure will force fluid past the inner shaft seals and into the bearings.
TECH TIP:
The rotation speed of the head can be fine tuned with three different viscous fluid choices to optimize
performance for specific applications;
Slow Fluid: BJ 048-S, Medium Fluid: BJ 048-M, Fast Fluid: BJ 048-F
The medium viscosity fluid is recommended by StoneAge for maximized performance and minimized
maintenance. Please contact your Dealer or StonAge Customer Service to select the right fluid for your
application.
SPEED CONTROL FLUID CHANGE
The speed control fluid changing is made easy with the WGR and disassembly of the tool is not
required. This means there is less chance for contamination and longer overall tool life. Fluid changes
should only be performed by qualified persons.
This flushing procedure is only recommended for replacing the fluid with the same fluid.
Not all of the fluid will be replaced using this procedure, therefore full disassembly and cleaning of the
tool is recommended when changing to a different speed, or viscosity of fluid. The WGR is designed
for maximum viscous fluid life and frequent fluid changes should not be required. A full fluid change is
necessary when replacing bearings and shaft seals.
VISCOUS FLUID REPLACEMENT INSTRUCTIONS
1. Position the tool (preferably mounted in a
vise) at an angle with one Port Plug (BJ 026)
at the highest point and the other Port Plug at
the lowest point. Clean around, then remove
the upper Port Plug from the body.
2. Fill the Syringe (BC 410) with viscous fluid by
removing the end near the handle, pulling out
the plunger, and pouring the Viscous Fluid
(BJ 048-x) in to fill the Syringe Body. With
plunger re-installed, purge air out of Syringe
hose.
3. Screw the syringe into the upper port, then
remove the lower Port Plug. Using the
assistance of gravity, gently ease the new
fluid into the WGR Body while letting the old
fluid flow out the opposite hole.
4. Rotate the Head while flushing.
DO NOT PRESSURIZE THE CHAMBER
by aggressively forcing in fluid. The fluid is
thick and some time is required to complete
the flush.
5. Reinstall the exit Port Plug, then remove the
Syringe and install the inlet Port Plug.
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