Clarke PW50A Instruction Manual

OPERATION & MAINTENANCE
INSTRUCTIONS
ORIGINAL INSTRUCTIONS GC0819 - ISS 1
PETROL ENGINE DRIVEN 2” PUMP
MODEL NO: PW50A
PART NO: 7140651

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INTRODUCTION
Thank you for purchasing this CLARKE Pump.
The PW50A petrol driven pump is designed for pumping clean water, or water
containing small solids in suspension. As the pump is fitted with an open
impeller the suction strainer supplied must always be used to ensure that large
stones or other objects cannot be drawn up, as this would cause severe
damage to the pump. It is NOT designed for pumping slurry, sludge, mud or
heavily polluted water, or any water containing chemicals or other acidic
contaminants including salt water. This pump has the ability to pump solids in
suspension no larger than 4 mm.
Before attempting to use this product, please read this manual thoroughly and
follow the instructions carefully. In doing so you will ensure the safety of yourself
and that of others around you, and you can look forward to your purchase
giving you long and satisfactory service.
SAFETY PRECAUTIONS
SAFETY WHEN USING YOUR PUMP
1. Thoroughly familiarise yourself with the pump & its operation and follow all
instructions in this manual.
2. ALWAYS ensure that the pump is properly positioned to prevent it moving
during operation and that the immediate area surrounding the pump is
kept clear.
3. ALWAYS ensure the pump cannot be started inadvertently by using the ON/
OFF switch whenever carrying out maintenance or making adjustments.
4. ALWAYS use a strainer on the suction hose to prevent stones and other
solids from being drawn up, which could severely damage the pump.
5. ALWAYS keep the pump dry and well clear of water discharge
6. ALWAYS use at least 300 mm of flexible hose to make pipe connections to
the pump. Rigid piping may put stress on the pump causing damage. If
rigid piping is used, it should be supported so as to eliminate stress.
7. ALWAYS observe all safety precautions for the handling of fuel.
CAUTION: AS WITH ALL MACHINERY, THERE ARE CERTAIN HAZARDS
INVOLVED WITH THE OPERATION AND USE OF THIS WATER PUMP.
EXERCISING CAUTION WILL REDUCE THE RISK OF PERSONAL INJURY.

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8. ALWAYS use in a well ventilated area.
9. NEVER refuel the engine whilst it is running and allow the engine to cool
sufficiently before refuelling.
10. NEVER use for pumping petrol (or other flammable liquids) or corrosive
chemicals. This pump is designed to pump water only.
11. NEVER operate an engine driven pump in an explosive atmosphere, near
combustible materials, or where there is insufficient ventilation.
12. NEVER run the pump dry. Always fill the pump with water before starting.
13. NEVER attempt any major repairs to this product unless you are qualified.
14. NEVER direct the discharge flow towards another person.
15. NEVER direct the water discharge towards electrical wiring or equipment.
16. NEVER use indoors or in a confined space.
17. NEVER over-tighten drain or filler plugs. Excessive force may damage the
threads or the pump body.
18. ALWAYS use only original CLARKE replacement parts. The use of non-
standard parts could be hazardous.
19. ALWAYS check for any damage or any condition that could affect the
operation of the pump. Damaged parts should be properly repaired.
20. Have your pump repaired by a qualified person. Repairs should only be
carried out by qualified persons using original spare parts, otherwise this
may result in considerable danger to the user.
GENERAL SAFETY IN THE WORKPLACE
1. ALWAYS keep work area clean & tidy. Cluttered work areas invite
accidents.
2. NEVER over-reach. Keep proper footing and balance at all times.
3. Keep other persons away. Do not let persons, especially children, touch
the pump and keep them away from the work area.
4. ALWAYS ensure the workplace is well lit. Ensure that lighting is placed so that
you will not be working in your own shadow.
5. Dress properly. Loose clothing or other jewellery may get caught in moving
parts. Non-slip footwear is recommended. Wear protective hair covering to
contain long hair.
6. ALWAYS wear safety glasses. (Everyday glasses are not safety glasses).

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OVERVIEW
1 Inlet Strainer/filter 12 Suction Chamber Drain Plug
2 Inlet Adaptor/locking ring with O-ring 13 Plug spanner/tommy bar
3 Water Filler Plug 14 Fuel Shut-off Valve
4 Outlet Adaptor/locking ring with O-ring 15 Choke Lever
5 Fuel Filler Cap 16 Throttle Lever
6 Air Filter Housing 17 Starter Recoil
7 Carburetor Drain Plug 18 ON/OFF Switch
8 Spark Plug 19 Oil Drain Plug
9 Suction Chamber Bolt 20 Oil Filler and Dipstick
10 Inlet or Suction Chamber 21 Rubber feet/fixings
11 Hose Securing Clips

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BEFORE USE
FITTING THE FEET
1. Fit the 4 x rubber feet to the frame
using the nuts and washers
supplied.
FILLING WITH OIL
This pump is not supplied containing
engine oil or fuel. Use an engine oil of
SAE 15-40 rating unless operating at
very high or low ambient
temperatures.
To fill the engine crankcase with oil:
1. Remove the filler plug/dipstick.
2. Fill the unit with oil until visible
inside.
3. Check the level by inserting the
dipstick back into the filler tube
and checking the level is within
the indicated range. If correct
replace the dipstick/filler cap

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.FILLING WITH FUEL
• Use unleaded petrol.
1. Open the fuel cap and top up as
required. Located within the fuel
tank is a filter. Check this filter
periodically and remove any
contaminants which may have
accumulated. Do not fill above
the fuel filter shoulder.
2. After refuelling, tighten the fuel
filler cap securely.
INSTALLING THE PUMP
1. Position the pump on a firm foundation and as near to the water source as
possible.
2. Connect the suction and
discharge hoses to the pump
using the hose clamps and sealing
rings supplied, to achieve an
airtight seal.
• There must be no damage to
the hoses which must be
adequately protected and
supported.
NOTE: Hoses or pipes should be
supported independently
and not carried by the
pump.
WARNING: WIPE UP ANY SPILT FUEL BEFORE RUNNING THE PUMP.
ALLOW THE ENGINE TO COOL DOWN BEFORE REFUELLING

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IMPORTANT: An air leak in the suction line will prevent priming, and reduce
the performance of the pump.
3. Pay particular attention to the following:
• Always ensure the hose adaptor sealing ring is in place and correctly
fitted.
• Always use a flexible hose at the pump body connection of at least
1ft (300 mm) length.
• Keep all pipes/hoses as short and straight as possible and avoid
sharp bends. If a flexible hose must be laid across a roadway,
protect it with planking.
• Ensure there is adequate drainage for the discharged water, and
that there is no danger of damage to property as a result of the
pumping activity.
NOTE: Instantaneous shut off pressure, applied when a vehicle runs
across an unprotected hose, will cause “hydraulic shock”, which
can damage the pump and/or the hose.
4. Attach the inlet strainer to the end
of suction hose using a further
hose clamp, to prevent large
stones etc, from being drawn up
which could cause severe
damage. Keep the strainer free of
debris.
5. If it is likely to clog with dirt or
debris, proceed by either:
• preparing a bed of stones on
which to rest the strainer.
• tying the strainer so that it stays off the bottom of the pit, pond or
excavation.
• rest the strainer inside a basket or bucket to keep undue debris
away.

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6. Prime the pump with water by
removing the filler plug on top of
the pump and filling with water,
leaving no air gap.
• The pump is self-priming only
when the pump is filled. It will
prime and re-prime itself
without refilling. Refilling is
necessary only if the pump has
been drained.
7. Never allow the pump to run dry.
8. If the discharge hose runs
vertically more than 30ft a check
valve should be installed in the
discharge hose near the pump to
stop water hammer when the
pump is shut down.
• It is the pump owners
responsibility to supply and
install a check valve to protect
the pump in this way.
9. Properly fuelled and lubricated, the pump will run without further attention.
OPERATION
Ensure the site and pump are prepared with the pump primed with water to
avoid any possibility of dry running, then proceed as follows:
STARTING
• Note the markings displayed on the engine parts, for the following
choke and throttle settings.
WARNING: WHEN THE ENGINE IS RUNNING THE EXHAUST MUFFLER
IS VERY HOT. TAKE CARE TO AVOID BURNS. NEVER RUN THE ENGINE
IN AN ENCLOSED SPACE - ENSURE THERE IS ADEQUATE
VENTILATION.

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1. Set the engine On/Off switch to
On.
2. Move the fuel valve to the right
side (open position).
3. Pull the starter recoil rope slowly
two or three times to allow fuel to
reach the carburetor.
• The direction of operation is
marked on the machine.
4. To start a cold engine, set the
choke lever to the left (closed
position), but if the engine is
already warm, the choke should
be in the open position to the
right.
5. Set the throttle about one third
open.
6. Pull the recoil starter rope firmly
until the engine starts. Do not
snatch at the starter rope and allow it to recoil slowly after each pull.
7. Once the engine starts, gradually return the choke to the open position as
the engine warms up and use the engine throttle to gradually increase
engine speed.
CONTROL DURING OPERATION
After starting the engine, move the throttle to the open position for priming of
the pump and checking for pump output. Output is controlled by adjusting
the engine speed.
The pump should begin discharging liquid in a few moments. To further reduce
priming time, the engine speed may be increased after the engine is properly
run in. If pumping does not start within this time, shut off engine and check
carefully to find the problem. See TROUBLESHOOTING.
NOTE: Filling the suction pipe with water will speed up the priming
process, and it is recommended that a non-return valve be fitted
to the end of the suction pipe.
On higher vertical lifts, a higher engine speed is necessary but on shallow lifts
or when there is little water to pump, preserve fuel and engine wear by
reducing engine speed.
In the event of blockages, where debris has entered the suction chamber, the
suction chamber can be opened and cleaned out by removing the bolts (12)
shown in the layout on page 18.

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SHUTTING DOWN
1. Reduce engine speed to minimum using the throttle lever.
2. Stop the engine by switching OFF the ignition switch.
3. Close the fuel valve.
MAINTENANCE
1. Always maintain the pump in a clean condition, checking regularly for
loose bolts etc.
2. Clean the air filter once every 50 hours of use (or more often in unusually
dusty conditions) as follows.
3. Unscrew the wingnut and lift off the air filter assembly from the engine.
4. Remove the components shown
and clean the foam filter element
with a high flashpoint solvent.
Squeeze dry, then dip in clean
engine oil and squeeze oil excess
oil.
• Never operate the pump
without the air cleaner installed
as this would cause premature
wear to the engine.
5. Replace the spark plug after the
first month or every 50 hours of
use.