Pacific Hydrostar 69746 Owner's Manual & Safety Instructions - Pre-Start Checks
Page 10
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ITEM 69746
SAFETY
SETU
p
Op
ERA
TION
M
AINTENANCE
Operation
Read the ENTIRE IMpORTANT SAFETY INFORMATION section at the beginning of this manual
including all text under subheadings therein before set up or use of this product.
pre-Start Checks
Inspect engine and equipment looking for damaged, loose, and missing parts before set up
and starting. If any problems are found, do not use equipment until fixed properly.
prime the pump
Before starting the engine, fill the Pump with water.
To do this:
1. Unthread the Priming Water Filler Cap
by turning it counterclockwise.
2. Fill the unit with clean water up to the
top of the opening. Replace the Priming
Water Filler Cap and tighten securely.
IMpORTANT! Always check for water in the Pump
Housing before each use. Never attempt to run the
Water Pump without the Pump Housing FULL of water.
Running the Water pump without water for
an extended period of time will damage the
Water pump and void the Warranty.
Priming Water
Filler Cap
Strainer
4. Secure the Intake Hose in place to keep it
from moving once the Pump is turned on.
The Intake Hose should be as short as
possible for more efficient operation.
5. Route the discharge hose to the desired discharge
location. If necessary, connect additional discharge
hoses to direct the discharge to the desired location.
Make sure to secure the discharge hose in place
to keep it from moving once the Water Pump is
turned on. The discharge hose should be kept as
short as possible for more efficient operation.
Operation Concerns
1. Cavitation: This is the sudden formation and
collapse of low-pressure vapor (bubbles) across the
vanes of the impeller.
Cause: When the surface pressure on a liquid
becomes low enough, the liquid will begin to boil
(even at room temperature). With centrifugal pumps,
cavitation can occur when the suction vacuum
becomes too great, allowing water vapor or bubbles
to form at the impeller. The rapid pressure increase
can cause impeller damage.
Solution: Minimizing suction head and using
the largest practical suction hose diameter will
reduce the likelihood of cavitation.
Do not use
a suction hose with a diameter smaller than
the pump’s Intake port (3" diameter).
2. Water Hammer Pressure: This is energy sent back
to the Pump due to sudden stoppage of water
flowing from the Pump.
Cause: Water hammer pressure is more likely to
occur when using a very long discharge hose. If the
flow of water at the end of the discharge hose is
shut off suddenly, energy is sent back to the pump.
This causes a large pressure spike in the Pump
housing, leading to potential damage to the Pump
casing.
Solution: Use as short a discharge
hose as possible and
turn off water
pump before closing water flow.