JET
7
Lubrication
The paving breaker should be lubricated with air
tool oil maintained in the reservoir, and with an in-
line oiler.
Storage
Avoid storing the paving breaker in very humid
locations which promotes rusting of internal
mechanisms. Always oil the tool and disconnect
air hose before storage.
Air system requirements
1. Use proper air hose size (refer to tool
specifications). The hose should be just long
enough to serve the working area. Excessive
hose length will cause pressure drop.
1. Make sure air compressor supplies clean,
dry air at correct CFM for the tool.
2.
Set air pressure to 90 psi.
Excess air pressure
and/or unclean air will shorten the tool’s
life and may create a hazardous situation.
3.
Drain water from air compressor tank daily,
as well as any condensation from air lines.
Water in the air line may enter the tool and
cause damage.
4.
Change filters on the air system on a regular
basis.
5. Air-line pressure may be increased
accordingly to compensate for extra-long air
hoses (usually over 25 feet). Inside diameter
of hose should be minimum 3/4-inch.
Disassembly
Disassembly and reassembly
should be performed by qualified personnel.
Refer to parts exploded view as needed.
1.
Disconnect air tool from air system.
2.
Loosen the back head bolt nuts, remove the
lock washer, and back head bolt nuts.
3. Remove back head from cylinder and
remove throttle valve, throttle valve spring,
plunger, and plunger spring.
4. Remove valve guide, valve, valve chest,
valve seat, valve chest dowel pin, and piston.
5.
Remove cylinder, tappet seat, and tappet.
6.
Disassemble front head:
•
Loosen the steel retainer bolt nut.
•
Remove steel retainer bolts, steel
retainer, and retainer bolt bushings.
•
Remove steel retainer plunger and
retainer spring.
•
Remove front head bushing from front
head by pressing it out from the backside
using a 15-ton press.
7.
Disassemble back head:
•
Remove the two throttle lever pins and
release the throttle lever.
•
Using a press and a 0.37” (9.4mm) pin,
remove throttle valve stem guide from
back head.
•
Remove the 5/8” oil control plug from
back head and take out the oil control felt.
8. Disassemble
air
inlet:
•
Loosen air inlet swivel nut and remove it
from cylinder.
•
Remove air inlet swivel.
•
Remove air inlet screen from cylinder.
•
Remove O-ring(s) from air inlet swivel nut
and air inlet swivel.
Reassembly
Front head assembly
1.
Using a 15-ton press, press the front head
bushing into place. A hex flat must align with
the front head steel retainer.
2.
Assemble the steel retainer spring and steel
retainer plunger into the front head.
3.
Assemble the steel retainer bolt bushings on
each side of the front head. Set the retainer
into the retainer slot. To support the retainer,
insert the retainer bolt through the bushings
from the stopper side of the front head.
4.
Place the 3/4” nut and washer on the bolt.
See the torque specifications chart for the
torque setting.