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Hollow shaft models mount directly on the motor or
engine shaft (See Figure 4). Adapters are available to
convert some solid shaft models for direct shaft mount-
ing. After mounting the pump, always turn it by hand to
make sure the pump is operating freely. Never apply
power to a pump that appears to be stuck.
CAUTION: Use a torque arm to keep the pump
from rotating with the shaft. The pump must be
allowed to float on the shaft and must not be tied
rigidly to the equipment on which it is mounted.
Inlet
Line
Pressure
Strainer
Regulator
Figure 5
Piston Pump Installation
Accessories should be installed with solid piping and be
mounted as close to the pump as possible. The hose must
be used right after accessories.
NOTE: If remaining installation is solid piping, a two to
four foot length of hose must be installed between
accessories and solid piping.
Hose
Selection of the right size and type of hose is vital for good
performance. Be sure to hook up to the proper ports on the
pump (note markings "IN" and "OUT" on pump castings).
Suction Hose
Always use genuine suction hose compatible with the fluids
being pumped and at least the same inside diameter as
pump ports. If the suction hose is over 5 feet long, use the
next larger size hose. Keep the suction hose as short as
possible and restrictions such as elbows, check valves, etc.
at a minimum.
Discharge Hose
High pressure pumps require the use of special high pres-
sure discharge hose (2 rayon braid or equivalent). Use a
hose rated at least 50% greater than the highest operating
Direct Drive - Hollow Shaft Installation
System Installation
Pump
Compound
Gauge
IN
Bypass Back to Inlet
Figure 4
Pulsation
Dampener
Filled
Pressure
Gauge
OUT
pressure required of pump. Example: If required pump pres-
sure is 200 psi, use discharge hose rated at minimum of 300
psi working pressure.
Unloader Valve
The unloader has a very important safety function in your
piston pump hookup. The unloader valve protects the pump
by unloading pressure when the gun is shut off or discharge
is otherwise blocked. This saves the pump and power
because the liquid is bypassed at a very low pressure. If the
gun is to be shut off for more than 5 minutes, install a pump
protector in the inlet side or stop the pump to prevent heat
buildup. The length of time may vary due to the original tem-
perature of the fluid being pumped.
Strainers
Use a suction line strainer with at least 3 to 5 times the suc-
tion port area in open screen area. For example, an area of
approximately 1.1 to 1.9 square inches for a 1/2" suction
port. Be sure the screen is suitable for the liquid being
pumped. Keep the filter clean. A clogged strainer will cause
cavitation, which usually leads to a poor performance and
wear of the pump parts.
-3-
CAUTION:
For safety, always install a shield
over rotating shafts. Or enclose
the pump/motor assembly inside
a housing.
Nozzle
Spray
Gun
Unloader
Valve
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