Table of Contents
Advertisement
Problem
Severe air leakage.
(Note: Minimal escape of
air is often normal for air
tools.)
Excessive heat develops
in tool.
Tool continues to operate
after releasing throttle
lever.
Steel tool is loose.
Steel retainer latch refuses
to catch.
12
JCT-4660 series Paving Breaker
Possible cause
Leakage from air inlet swivel.
Leakage from throttle valve area.
Leakage from back head and
cylinder.
Improper lubrication.
Worn internal parts.
Throttle valve seat is damaged.
Blockage in valve area.
Steel shank does not match
retainer bushing.
Front head bushing is worn.
Excessive wear of retainer.
Excessive wear of retainer
plunger and spring.
Remedy
Change O-rings and check for
loosening of air inlet swivel nut.
Check for wear of throttle valve
stem guide. Replace if needed.
Check plug; change O-ring on
throttle valve. Also check for
foreign matter which may have
entered during assembly.
Lubricate properly according to
instructions in this manual.
Inspect and replace as needed.
Replace valve seat.
Remove any foreign matter.
Use steel with correct shank type.
Replace bushing.
Replace parts as needed.
Replace parts as needed.
Advertisement
Table of Contents
