TM 5-3820-233-12/2
b. Lower side conveyors into place and bolt together
Screening Unit is considered a secondary unit, meaning
that a Primary Jaw Crushing Unit has reduced the raw
at hinge.
c. Check complete unit for loose nuts, bolts, keys
material to a size that the Roll Crusher on the Secondary
Unit can receive and reduce to the finished size
and bearing collars.
product.(Table 2-1, Roll Crusher Feed Size Chart, for
d. Check complete unit for foreign material, such as
maximum size feed to the Secondary Unit.) Feeding
scrap iron and other uncrushable material.
oversize material up to the Roll Crusher will be visibly
e. Remove all shipping braces, on screen, elevating
apparent by the failure of the material to be nipped and
wheel, etc.
pulled in between the roll shells and a subsequent
bubbling action of the material above the shells. Feeding
g. Check all conveyor belts for proper tension (para
material larger than recommended will accelerate the
wear on the roll shells and greatly reduce the capacity of
h. Check screen wire for correct opening for
the crusher. It is important that the operator on the
Primary Unit make sure that the Secondary Unit is
i. Check discharge opening between roll shells (para
operating satisfactorily and all components are at full
recommended speed before starting to crush material in
j. Check adjustments on delivery and sand conveyor
the Jaw of the Primary Unit. It is necessary to always
stop the feed to the Primary Jaw Crusher before shutting
k. Check idler sprockets on all chain drives.
the Secondary Crushing and Screening Unit down unless
for an emergency. Normally the Primary Unit will be shut
down and the Secondary Unit allowed to operate until all
2-3. Equipment Conversion
the material has "run-out" of the Plant and then
The Portable Crushing and Screening Unit can be used
discharged onto the waiting trucks or stockpiled on the
in gravel or rock and will possibly be required to crush
ground.
various types and sizes of raw material. This material
will vary in sizes, gradation, moisture content, weight,
The Crushing and
2-4