32-2
03
Clearing a Stalled Jaw Crushers
Procedure to release a stalled jaw crusher
1. Observe all safety warnings.
2. Isolate machine from all energy sources.
3. Ensure the safety grid is over the mouth of the
crusher.
4. If the crusher is equipped with hydraulic drive,
attempt to start the machine in reverse.
5. If the crusher is equipped with a hydraulic
wedge adjust system, attempt to release the
pressure on the jaw by opening the jaw using
the machine controls.
6. If none of the above operations are applicable,
or successful, then the toggle plate must be cut.
7. Before the cutting operation is commenced
adequate and appropriate provision MUST
be made to support the weight of the stored
energy in order to prevent the violent swinging
movement of the jaw.
8. The toggle plate should heated across the
centre line, between the holes, using a long-
handled large gas torch, such that the operator
can stand in a protected position, well clear of
the back of the crusher frame.
9. Heat the material to a dull red, starting at the
mid point, and working outwards either side in
turn. Ideally, the toggle plate should be heated
until it yields. The yielding of the toggle plate
will reduce or eliminate the pressure on the
trapped object.
10. If the plate does not yield, then it is
recommended that small cuts are made in
either side of the toggle plate with an acetylene
cutting torch approximately 50mm (2in) from
each side and the heating procedure repeated
until yielding occurs.
11. After the pressure is released due to the toggle
plate yielding, the toggle plate should be cut in
two and removed.
For advice, contact your local dealer or technical
support.
To Next Page
Loading...