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Strong-Master Pump
Dwg. #86000020
The Strong-Master pump consists of three principle parts, i.e., the pumping elements, the suction housing
for material storage and the drive assembly to transfer power to the pumping elements.
The pumping elements for the grout machine consists of a 2R10-0 rotor and stator connected to the
suction housing. This rotor-stator combination is capable of producing 400 PSI pressure when new.
Pressure of this amount will not be encountered during normal operations, UNLESS a “plug-up” in the
hose occurs. When pressure of this amount occurs, stop the pump, put in reverse and relieve pressure.
Find the “plug” in hose. Remove and clean the plugged section of hose. As the pump is operated, the
rotor and stator will wear, causing the pressure to drop and discharge to fall off. Should either rotor or
stator have excess wear it will shorten the life of the other part considerably. Worn parts cause “slippage”
within the pumping elements which accelerates the wear. Generally, the stator wears first. With some
grades of sand, the life of the stator could be as little as 300 yards, or about 600 batches. To prolong the
stator life, change ends after about 250 yards, or 500 batches. Generally, two stators can be used with
each rotor. Check rotor for wear with stator removed to see that is has uniform wear. If wear is
excessive, the chrome will be worn off the lobes of rotor, usually at discharge end. When this occurs,
replace rotor. Worn rotors will result in reduction of stator life by one-half or more. Never use a new
rotor with worn out rotor. When wear is excessive, the material flow from hose will decrease and become
intermittent. When flow breaks, s small puff of vapor comes out. At this point, the rotor and stator
should be examined and one, or both, replaced if wear is observed.
To remove the stator, loosen the “U” bolt clamp and break the joint with a pipe wrench. The stator can
then be screwed out of threads by rotating the rotor slowly. After the stator is out of the threads, replace
the pipe wrench and hold the stator from turning; and again, turn the rotor. The stator will “worm-off”
the rotor. To replace the stator, reverse this procedure and use the machine power to turn the rotor.
Caution: When using a pipe wrench to hold the stator be sure the pump is turning at the lowest
speed possible. Stay clear of the pipe wrench.
The suction housing has the material hopper bolted to it. A connecting rod connects the rotor to the drive
shaft at the hub inside the suction housing. The connecting rod has a section of auger flighting bolted to it
to keep materials agitated during operation. These parts operating in a sand-gypsum, or cement slurry,
are subject to severe wear. The connecting rod should be inspected for excess wear at the pinholes every