jcb 67C-1, Service Manual

Page: 50 / 51

03 - Attachments, Couplings and Load Handling
48 - Rockbreaker
00 - General
03 - 18 9813/3450-2 03 - 18
Health and Safety
WARNING The rockbreaker must be positioned
correctly before attempting to release it from
the quickhitch. if incorrectly positioned, the
rockbreaker could swing or fall suddenly from
the machine when releasing the quickhitch latch
hook.
CAUTION When using an attachment for
example a hydraulic breaker, where the risk of
flying debris is present, a protective layer (e.g.
safety glasses or screen guard must be attached
to the front of the cab) to protect the operator from
flying debris which could cause injury.
Notice: Every breaker has its own flow
requirement. If the machine is not preset to deliver
the correct flow for the breaker installed, either
the breaker will not function correctly or the
machine may be damaged. Whenever a breaker
is installed, it is essential that the engine speed
is correctly preset to suit the breaker. Have your
JCB dealer reset the engine speed before using
the machine with a new breaker installed. This is
a specialist job and the machine can be seriously
damaged if it is not done correctly.
WARNING The attachment will move when
released. Stand clear and to one side when
releasing the attachment.
WARNING Always install the quickhitch latch
hook locking pin (mechanical only). Failure to
install the pin will result in possible failure of the
latching mechanism. Such a failure could result
in the sudden release of an attachment from the
machine and you or others could be killed or
seriously injured.
Remove and Install
To prevent premature wear, failure and breakage,
the Quickhitch assembly must be used with a
rockbreaker for short periods only. If the machine is
to be used for rock breaking for a long period of time,
it is recommended that the rockbreaker is installed
directly on the machine.
When using a rockbreaker, it must be curled towards
the machine as a typical digging operation.
Do not use the rockbreaker as a lever as this causes
excessive loads on the locking mechanism.
The Rockbreaker is a single acting attachment, make
sure the ball valve is in the correct position.
Install
1. Set the rockbreaker on solid, level ground. Use
safe and correct lifting equipment to move the
bucket.
2. Position the machine.
3. Use the excavator controls to engage the jaw of
the Quickhitch with the pivot pin of the breaker.
4. Use the excavator controls to roll the Quickhitch
in until the latch hook has fully engaged the
pivot pin on the breaker. It may be necessary to
apply a load to achieve Quickhitch connection.
Alternatively, use the tommy bar to lever the latch
off, allowing the breaker pivot pin to locate in jaw
of the Quickhitch.
WARNING! Make sure that the latch hook has
fully engaged, otherwise the attachment could
fall and you could be killed or injured
5. Install the latch hook locking pin and secure with
the lynch pin.
Remove
1. When possible, put the Quickhitch attachments
on solid, level ground to make the installation
procedure safe and easier.
2. Park the machine on solid, level ground.
3. Position the rockbreaker just clear of the ground
and at an angle such that the rockbreaker does
not detach from the front pivot pin when the
Quickhitch is unlatched.