6
JCT-4660 series Paving Breaker
Setup and Assembly
Any missing parts or damage should be reported
immediately to your JET
®
distributor. Do not use a
damaged tool. Read this instruction manual
thoroughly for operation, maintenance and safety
instructions.
Box contents:
1 Paving
Breaker
1
Operation and parts manual
1 Warranty
card
Operation
The paving breaker must be
properly lubricated before operation.
Figure 1 (JCT-4661 shown)
1. Pull down on retainer (Figure 1) to insert
steel (not provided). Apply grease to shank
of steel before insertion. Push up on retainer
to secure steel, then tug on steel to ensure it
is properly caught in the bushing.
Note: When installing a chisel, blade should
be parallel with handles on breaker.
2.
Remove oil plug and fill reservoir with air tool
oil up to lowest thread of fill hole. NOTE: Air
tool oil not provided; it is available at most
major hardware and tool stores. SAE #10 oil
may be used as a substitute. Do not use
detergent oil.
3.
Reinstall plug. The oil control plug (#4, page
14; #3 page 16) can be turned to regulate
flow through the tool.
4.
Remove protective cap from air inlet. Blow
out air line to remove any dirt or moisture,
then connect air supply hose to tool. Set air
pressure to 90 psi.
IMPORTANT:
Connecting a quick-change
coupling directly to the tool is not
recommended, as vibration may cause the
connection to fail. Instead, add a leader hose
and install any quick-change couplings
farther down the line.
5.
Use both hands on grips, and place steel in
contact with work surface.
6. Push stop lever inward to release throttle
lever. Press and hold throttle lever. Release
throttle lever to stop.
Apply constant pressure to work surface to
prevent as much recoil as possible. Release
throttle lever after breaking through the work, and
when removing tool from the work.
Important:
Do NOT raise air pressure above
maximum rating for this paving breaker. If tool is
not accomplishing task at maximum air pressure
and flow, use a larger tool or different means to
achieve task.
When finished operating this tool, turn off air
supply and bleed residual air by pressing throttle
lever briefly. Disconnect air hose.
User-maintenance
Inspect paving breaker before each use. Ensure
that steel is secured inside retainer. After use,
wipe down the tool with a rag. Periodically apply
light coat of oil to exposed metal surfaces to inhibit
rust.
Periodically check torque of bolts in front and back
head. Loose bolts can result in loss of power and
tool damage. See
“Torque specifications.”
