18
PI-190
June 2019
6.0 4” J-FORCE GEN II MAINTENANCE
When not in use, the 4” J-Force Gen II should be cleaned to remove any
debris, deposits, or contaminants that could impede rotation, and sprayed
with water-dispersing lubricant (e.g. WD-40) for storage until next use.
The 4” J-Force Gen II utilizes water-bearing technology coupled with
an eddy-current braking system to control the rotation speed. No oil is
required, allowing for a quick and pain-free rebuild of the tool.
See YouTube for videos showing 4” J-Force Gen II service.
CAUTION
The use of gloves is recommended when handling the tool
after operation as the body may reach temperatures greater than 200
F.
6.1 DISASSEMBLY FOR MAINTENANCE (See Figure A)
1. While holding the inlet nut (4) stationary in a vice or with a 1-1/4”
wrench, unscrew the mandrel (8a) by turning it counterclockwise
with a 3/8” socket wrench.
2. Once the mandrel is unthreaded from the inlet nut, the inlet nut
and adjuster (3) will separate from the head assembly (7). Once the
magnets in the back of the head assembly are exposed, take care
to protect them from mechanical damage. The magnets are fragile
and will crack upon any significant impact.
3. Remove the mandrel (8a) and thrust bearing (8c) from the head
assembly (7).
4. Remove the flange bushing (8b) from the head assembly (7) by
pushing it out from the back side. The bushing removal tool (PN
67013) may be used to make contact with the back edge of the
flange bushing to push it out, as shown below. Note orientation of
tool.
