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Reproduction
10 BRIGGSandSTRATTON.COM
What is “Head”?
Figure
10
Head refers to the height of a column of water that can
be delivered by the discharge of the pump.
Suction Head
(
A
) is the vertical distance between the
center of the pump and the surface of the liquid on the
suction side of the pump. May also be referred to as
“suction lift”. The atmospheric pressure of 1 bar (14.5
psi) at sea level limits suction head lift to less than
approximately 8m (26 ft) for any pump.
Discharge Head
(
B
) is the vertical distance between
the pump’s discharge port and the point of discharge,
which is the liquid surface if the hose is submerged or
pumping into the bottom of a tank.
Total Head
(
C
) is the sum of the suction head value
plus the discharge head value.
As water pumping height increases, pump output
decreases. The length, type, and size of the suction
and discharge hoses can also significantly affect pump
output.
It is important for the suction operation to be the
shorter part of the total pumping action. This will
decrease the priming time and improve pump
performance by increasing the discharge head.
See
Specifications
for maximum head values.
Move Water Pump to Safe
Operating Location
For best pump performance, locate the pump on a
flat, level surface as close as possible to the water to
be pumped. Secure water pump to avoid tipover. Use
hoses that are no longer than necessary.
WARNING
Exhaust heat/gases could ignite
combustibles, structures or damage fuel tank
causing a fire, resulting in death or serious injury.
• Keep at least 1.5 m (5 ft) of clearance on all sides of
water pump including overhead.
Prime the Water Pump
Figure
11
1. Remove priming plug from top of pump.
2. Fill pump with clean water up to level shown.
3. Replace priming plug.
NOTICE
Improper treatment of water pump can damage it
and shorten its life.
• Be sure pump chamber is filled with water before starting
the engine. Never run pump without priming.
Locate Strainer Basket Into Water
Source
Figure
12
Place strainer basket into water to be pumped. Basket
must be fully immersed in water. To reduce sand or silt
suction, place basket into bucket or on top of coarse
rocks.
NOTICE
Improper treatment of water pump can
damage it and shorten its life.
• NEVER operate pump without strainer basket connected
to end of suction hose.
• Keep strainer out of sand or silt - place in bucket or
on stones.
• DO NOT let pump run dry or damage to seals may result.
Never run pump without priming.
• DO NOT pump salt water.
Starting the Water Pump
Figure
13
Use the following start instructions:
1. Make sure unit is on a flat, level surface and pump
chamber is primed.
2. Turn fuel shutoff (
C
) to ON (I) position.
3. Move choke lever (
B
) to “
Choke
” ( ) position.
4. Push on/off switch (
D
) to ON (I) position.
5. Move engine speed lever (
A
) to “
Fast
” ( ) position.
WARNING
Starter cord kickback (rapid retraction) will
pull hand and arm toward engine faster than you can
let go which could cause broken bones, fractures,
bruises, or sprains resulting in serious injury.
• When starting engine, pull cord slowly until resistance is
felt and then pull rapidly to avoid kickback.
• Keep hands and body clear from discharge of pump.
• Secure discharge hose to avoid whipping.
6. Grasp recoil handle (
E
) and pull slowly until slight
resistance is felt. Then pull handle rapidly to overcome
compression, prevent kickback and start engine.
NOTICE
If excessive fuel is present in the air/fuel
mixture causing a “flooded” condition, engine won’t
start. Move choke lever (
B
) to “
Run
” ( ) position and
pull handle repeatedly until engine starts.
7. As the engine warms, move choke lever (
B
) to “
Run
”
( ) position. Operate with choke in “
Run
” position.
NOTICE
It may take a few minutes for water pump to
begin pumping water.
NOTICE
If engine starts after 3 pulls but fails to run,
or if unit shuts down during operation, make sure
unit is on a level surface and check for proper oil
level in crankcase. This unit is equipped with a low oil
protection device. If so, oil must be at proper level for
engine to start.
WARNING
Exhaust heat/gases could ignite
combustibles, structures or damage fuel tank
causing a fire, resulting in death or serious injury.
Contact with muffler area could cause burns
resulting in serious injury.
• Do not touch hot parts and AVOID hot exhaust gases.
• Allow equipment to cool before touching.
• Keep at least 1.5 m (5 feet) of clearance on all sides of
water pump including overhead.
Pump output is controlled by adjusting engine speed.
Moving the engine speed lever in the “
Fast
” ( )
direction will increase pump output, and moving the
engine speed lever in the “
Slow
” (
) direction will
decrease pump output.