Strong GR4 Procedures Manual page 7

f. Remove the cap. Operate the pump until the water has been discharged and then proceed
with the pumping of the slurry.
This field test should be repeated if any damage or accident befalls a section of the hose or if, for
any reason, a section is suspect.
All replacement material hose should not be less than 800 PSI tested. Such hoses can be obtained
from Strong Mfg. Co. If a local supplier is used, the following brand and model numbers are
appropriate:
•
Gates Rubber Company – 1 ½" plaster hose 800 PSI working pressure – Product
#33280015
•
Acme Hamilton Mfg. Corp. – 1 ½" plaster hose 800 PSI working pressure Spec. No. 39-
9126
Do not use other hoses unless specifically advised by the Strong Manufacturing Company that
they are adequate.
Caution: Do not operate the machine unless a properly functioning pressure gauge, which is
supplied with the machine for use at the discharge end of the pump, is attached. This gauge
allows the operator to prevent excessive pressures which could cause the hose to burst.
Caution: Never use weathered, rotten, or damaged hoses with damaged fittings in conjunction
with pumping operations. They represent a hazard to operators, bystanders, and persons handling
the hoses. If a hose should burst or a fitting let go under pressure, persons could be injured.
Caution: When removing a section of hose, pressure must be relieved before undoing a fitting.
This can be done by putting the pump in reverse and running it slowly until the discharge hose at
the pump becomes soft*. Failure to do this will result in the hose being under pressure when the
fitting is undone, and material being blown out when disconnected striking the face & eyes with
the danger of injury by striking.
*When pumping in reverse, be sure that materials are coming back into the hopper as evidenced
by the materials level in the hopper rising. Watch the discharge hose to avoid collapsing it and
causing the pump to run dry.
5. Never run the materials pump dry because just a few minutes of running dry will ruin the pump
stator. Always have water or slurry in hopper when running pump.
6. If plug-up occurs, or a section of hose is to be removed, the hose pressure must be relieved before
uncoupling a fitting. This is done by running the materials pump in reverse slowly, until the
pressure gauge on the pressure assembly reads "0" PSI. Failure to do so will result in material
under pressure "blowing out" when uncoupled, resulting in possible bruises, lacerations, and most
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