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.

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6. Check when installing that the
spark plug has the correct
clearance by measuring with a
feeler gauge and adjusting the
side electrode as required.
• Clearance should be 0.7-
0.8mm.
• The recommended spark plug
is LDF7RTC.
CHANGING THE OIL
The oil in the engine should be changed after the first 20 hours use and
thereafter every 6 months or 100 running hours.
Remove the dipstick and drain plug and then drain the oil. Re-fill and check
the level as described on page 6.
We recommend SAE15W-40 or equivalent motor oil.
ENVIRONMENTAL PROTECTION
One of the most damaging sources of pollution is oil. Do not throw away used
oil with domestic refuse or flush down a sink or drain. Collect old oil in a leak-
proof container and take it to your local waste disposal site.
STORAGE
After use, drain the pump body whenever there is danger of freezing, and if
the pump has been used with contaminated or salty water, It should be
thoroughly flushed with clean water following use, both inside and out and
drained before replacing the drain plug.
Always transport the pump with the fuel cock turned off and keep the unit
level to prevent any fuel from spilling.
If the pump is not to be used for some time, it should be flushed thoroughly
with clean water, and drained completely before storing in a clean dry
environment. Additionally, it should be prepared as follows:
CAUTION: PROLONGED EXPOSURE TO USED OIL IS HARMFULL,
ALWAYS WASH YOUR HANDS THOROUGHLY AFTER HANDLING USED
OIL.

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1. Drain the fuel tank and carburetor
completely by opening the drain
plug in the carburetor float
chamber and draining all
remaining fuel into a suitable
container ensuring the fuel shut-
off valve is closed.
2. Remove the spark plug, and pour
2-3 teaspoons of light oil into the
cylinder through the spark plug
hole.
3. Pull the starter recoil rope slowly 2 or 3 times so that the oil is deposited on
the cylinder walls and replace the spark plug.
• Suction and delivery hoses, additional connectors and filters are
available from your Clarke stockist.
TROUBLESHOOTING
PROBLEM CAUSE SOLUTION
Engine fails to
start
Lack of fuel in tank. Fill tank as necessary.
No fuel reaching
carburettor.
Fuel tap is set to OFF. Turn on fuel
tap.
Engine switch is in the
OFF position.
Set engine switch to the ON
position.
Lack of spark at the
spark plug.
Check the spark plug cable is
securely fitted to the plug. With
the switch in the ON position, hold
the spark plug electrode against
the engine and pull the starter
cord to observe the spark. If spark
is present but engine will not start,
consult your Clarke dealer.
Engine stops and
will not re-start.
Lack of fuel in tank Fill tank as necessary.
Lack of oil in engine
causing ‘Low Oil Pro-
tector’ sensor to stop
engine from running.
Top up oil sump as necessary.

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If, after reading the troubleshooting chart you are still unable to rectify any
faults, please contact your local dealer or CLARKE International for assistance.
ENVIRONMENTAL RECYCLING POLICY
At the end of its working life, do not dispose of this product or its components
with general household waste. Any tools, accessories and packaging should
be sorted, taken to a recycling centre and disposed of appropriately.
Pump fails to
prime.
Priming chamber not
filled correctly.
Fill priming chamber leaving no
air gap.
Air leaking through the
suction line joints due
to damaged hose,
broken hose clamps,
split/ill-fitting gasket.
Carry out repairs as necessary.
Blocked inlet hose. Clean strainer and ensure it is not
submerged in mud or sediment.
Ensure there are no kinks in the
delivery hose.
Engine speed too low. Increase engine speed.
Damaged impeller. Dismantle pump and replace
impeller.
Air leaking through
damaged seal.
Replace seal.
Low output from
pump.
Engine speed too low. Increase engine speed.
Impellor clogged. Clean strainer and ensure it is not
submerged in mud or sediment.
Pickup or delivery hose
obstructed.
Clear obstruction and ensure
there are no kinks in hose.
High frictional losses in
long inlet hose.
Avoid un-necessary curves,
restrictions or valves.
Suction lift too high. Position pump as close as possible
to the water level.
Congested material
inside pump.
Dismantle pump and clean out.
Damaged impeller. Dismantle pump and replace
impeller.
PROBLEM CAUSE SOLUTION

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SPECIFICATION
COMPONENT PARTS - GENERAL
Item Spec
Product dimensions (L x W x H) 470 x 375 x 400 mm
Product Weight (kgs) 23.3 kg
Water classification Clean/Dirty
Max solids in suspension 4 mm
Inlet/Outlet Size 2” BSP
Maximum Rated Flow 550 l/min (33m3/h)
Max Head 30.6 m
Suction Head 7 m
Max Pressure (Rated) 0.25 MPa (2.5 bar)
Run time @75% rated load 2.65 hrs
Engine type/speed 6.15HP (4 stroke) 3600rpm
Fuel tank capacity (petrol) 3.6 L
Lubrication oil capacity/grade 0.6 L (SAE 15W40)
Sound Pressure Level 90.89 dB LpA
Sound Power Level 103 dB LWA
Guaranteed sound power level 106 dB LWA
Uncertainty Factor (K) 3 dB

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COMPONENT PARTS - PUMP ASSEMBLY
No Description No Description
1 Locking Collar 13 Washer
2 Hose Adaptor 14 O-Ring
3 Sealing Ring 15 Guide Flow Cover
4 Bolt M8 x 20 16 M8 x 25 Bolt
5 Water Inlet Flange 17 Pump Impeller
6 Check Valve 18 Flat Key
7Gasket 19BoltM8x45
8 Discharge Elbow 20 Sealing Ring
9DrainPlug 21O-Ring
10 O-Ring 22 Water Seal
11 Pump Casing 23 Joining Flange
12 Flange Bolt M8 x 25

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COMPONENT PARTS - ENGINE ASSEMBLY

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COMPONENT PARTS - ENGINE ASSEMBLY
No Description No Description
1 Fuel Tank Cap 31 Air Deflector
2 Fuel Strainer 32 Oil Drain Plug
3 Fuel Tank 33 Gasket
4 Tension Spring 34 M6 x 12 Bolt
5 Governor Arm 35 Suppressor
6NutM6 36Crankcase
7Gasket 37Pin
8 Governor Lever 38 Oil proximity Sensor
9 Governor Rod 39 Bolt M6 x 15
10 Governor Spring 40 Bearing 205
11 Bolt 41 Governor Gear
12 Governor Assembly 42 Woodruff Key
13 Bolt M6 x 10 43 Bearing Cap
14 Starter Cover 44 Big End Bolt
15 Spring 45 Crankcase Gasket
16 Recoil Starter Assembly 46 Oil Dipstick
17 Spring 47 Sealing Ring
18 Starting Pawls 48 Crankcase Cover
19 Pin 49 Bolt M8 x 35
20 Clip Spring 50 Starting Handle
21 Starting Engagement Disc 51 Starting Cord
22 Bolt M6 x 15 52 Wingnut
23 Bolt M6 x 12 53 Air Cleaner Cover
24 On/Off Switch 54 Filter Sponge
25 Recoil Cover 55 Air Cleaner Base
26 Flywheel Nut 56 Nut M6
27 Starting Claw 57 Intake Duct Assembly
28 Fan 58 Bolt M6 x 25
29 Flywheel Assembly 59 Ignition Block Assembly
30 Oil Seal 60 Cylinder Head Stud

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GUARANTEE
This product is guaranteed against faulty manufacture for a period of 12
months from the date of purchase. Please keep your receipt which will be
required as proof of purchase.
This guarantee is invalid if the product is found to have been abused or
tampered with in any way, or not used for the purpose for which it was
intended.Faulty goods should be returned to their place of purchase, no
product can be returned to us without prior permission.
This guarantee does not effect your statutory rights.
61 Bolt 85 Rocker Arm
62 Gasket 86 Muffler Cover
63 Carburetor 87 Rocker Bolt
64 Gasket 88 Pushrod Retainer Frame
65 Fixing plate 89 Pushrod
66 Gasket 90 Exhaust Gasket
67 Stud 91 Cable Bracket
68 Cylinder Head 92 Screw
69 Cylinder Head Gasket 93 Bolt
70 Exhaust Valve 94 Circlip
71 Inlet Valve 95 Connecting Rod
72 Tappet 96 Muffler
73 Camshaft 97 Nut M8
74 Rubber Tube 98 Compression Ring
75 Exhaust Valve Adjusting Nut 99 Piston Ring
76 Inlet Valve Spring Retainer 100 Oil Ring
77 Exhaust Valve Spring Retainer 101 Small End Journal
78 Valve Spring 102 Piston
79 Spark Plug (type LD F7RTC) 103 Crankshaft
80 Bolt M6 x 14 104 Oil Dipstick
81 Valve Cover 105 Spark Plug Lead/Cover
82 Cover Gasket 106 Air Filter Seating Ring
83 Nut 107 Sealing Ring
84 Nut 108 Flanged Washer

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DECLARATION OF CONFORMITY