DOA SP 20 User manual

October 2014 -VEDITION
SUBMERSIBLE TRASH PUMP
WITH HYDRAULIC MOTOR
SP 20
WP 25
SP 35
SP 45
DOA s.r.l.
VIA CORTIVA 5- 22060 NOVEDRATE (Como) ITALY
TEL [phone] FAX [phone]
www.doa.it e-mail: [e-mail]
USE - SAFETY AND
MAINTENANCE MANUAL
IMPORTANT
READ MANUAL BEFORE USE
KEEP THIS MANUAL FOR
FUTURE CONSULTATIONS

2
INTRODUCTION
Dear customer,
congratulations for having purchased a DOA product. The tool you bought was
manufactured with high quality materials and components to assure your maximum
satisfaction and a long lasting service without problems. For your safety and obtaining
the best result, we recommend to read this manual and respect the simple instructions
contained, this will protect you from accidents and avoid damages to the equipment and
things.
Keep it always available together with its enclosures, so that it can be consulted when
necessary.
BE CAREFUL WHEN YOU CONNECT A HYDRAULIC TOOL TO AN OPERATING
MACHINE WHERE THE HYDRAULIC MAXIMUM VALUES OF PRESSURE AND FLOW
ARE UNKNOWN. FOR AVOIDING ACCIDENTS AND DAMAGES TO THE EQUIPMENT,
BE SURE THAT THE MAXIMUM VALUES OF PRESSURE AND FLOW ARE
COMPATIBLE WITH THOSE ONES OF THE TOOL ITSELF.
NOTE –THE TEXT AND THE ILLUSTRATIONS IN THIS MANUAL ARE AN
EXCLUSIVE PROPERTY OF DOA S.R.L. THE PERSON WHO USES THE TEXT OR
REPRODUCES, EVEN PARTIALLY, ILLUSTRATIONS OR PARAGRAPHS FOR
NON-AUTHORISED PURPOSES CAN BE LEGALLY LIABLE.
DATA, ILLUSTRATIONS AND CHARACTERISTICS OF THIS MANUAL ARE ONLY
INFORMATIVE AND NOT BENDING.
DOA S.R.L. RESERVES THE RIGHT TO MAKE MODIFICATIONS AT ANY TIME AND
WITHOUT PREVIOUS NOTICE.

3
SAFETY SYMBOLS
This manual contains safety warnings represented by symbols indicating three different
levels of danger:
This symbol indicates an operation or situation
extremely dangerous which can cause serious
accidents or death if proper precautions are not
respected.
This symbol indicates a dangerous operation or
situation that can cause serious accidents or death.
This symbol warns about generic danger that can
cause accidents and damages to the equipment or
the properties.
This symbol indicates important information.
IMPORTANT:
WHEN THE EFFECTS OF A CERTAIN ACTION ARE NOT EXACTLY KNOWN, REMIND
THAT EVEN THE SIMPLEST OPERATION MAY HIDE DANGERS.
IN CASE OF DOUBTS DO NOT RISK –DO NOT MAKE EXPERIMENTS!
ASK YOUR DOA DEALER OR YOUR FOREMAN.

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DESCRIPTION OF THE PRODUCT
WP 25 –SP20 - SP 45 are hydraulic submersible clear water and trash pumps centrifugal
type - open impeller, SP 35 is monocanal closed impeller.
These tools can pump suspended solids in the liquid with dimension up to mm 12 the WP
25, mm 30 the SP 20 , mm 50 the SP 35 and mm 70 the SP 45.
Thanks to the hydraulic functioning and manufacturing quality, pumps give very high
performances and possibility to run dry without damages.
TYPICAL APPLICATIONS
WP 25 –SP 20 –SP35 general pumping works of clear and moderately muddy waters.
SP 45 pumping of slurries and muddy waters and thick liquids.
All pumps are ideal in the emergency pumping of great volumes of water pumping and
emptying of water from excavations and manholes pumping of flammable and aggressive
liquids.
ACCESSORIES
-ALL PUMPS oil flexible hydraulic hoses length m 7 and m10 and multiples.
TYPICAL POWERING MACHINES
Hydraulic power packs –mini excavators –tractors –trucks –all-terrain vehicles –earth-
moving machines –all the vehicles equipped with a sufficient hydraulic circuit.

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WP 25 TECHNICAL CHARACTERISITCS
GENERAL VIEW –MAIN COMPONENTS AND THEIR FUNCTIONS
1. FEMALE QUICK COUPLER –Oil enters in pump from this female coupler ( PRESSURE
LINE ).
2. MALE QUICK COUPLER –Oil exit pump from this male coupler ( RETURN LINE ).
SHORT HOSES (illustrated in the picture below) on some pumps are installed short hoses
that have the function to get installation of couplers in an elastic position, on the hose with the
MALE coupler there is installed a check valve that have the function to prevent at the oil to
enter in the pump from this side, this is possible when are made wrong installation of the
hoses.
3. HYDRAULIC MOTOR
4. RING NUT –allow to open the pump body for cleaning and inspection.
5. COUPLING PLATE –between motor and pump body.
6. GRILLE –( only on model WP25 the models SP20, SP35, SP45 do not have the grille ), the
grille is a kind of filter that prevents the passage of objects no lager then 15 mm.
7. PUMP BODY –VOLUTE inside there is the pumping chamber.
8. ADAPTOR not installed on all units, the adaptor can be of different type depending from
country to country and upon the type of discharge line or water discharge hose used.

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SP 20 - SP35 TECHNICAL CHARACTERISITCS
GENERAL VIEW –MAIN COMPONENTS AND THEIR FUNCTIONS
1. MALE QUICK COUPLER - oil exits the pump from this coupler.
2. FEMALE QUICK COUPLER - oil enters in the pump from this coupler.
3. HYDRAULIC MOTOR
4. COUPLING PLATE - fixes the motor to the pump body.
5. RING NUTS - ( SP35 only - Not installed on SP20 ) allow to open the pump in few seconds for
cleaning and inspection.
6. SUCTION HOLE - liquid is sucked into the pump from this hole.
7. GRILLE - fabricated in stainless steel has the function of elevating the suction hole.
8. PUMP BODY - VOLUTE Stainless steel.

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9. CAMLOCK or UNI70 MALE ADAPTOR allow the connection of the discharge hose to the
pump.
SP 45 TECHNICAL CHARACTERISITCS
GENERAL VIEW –MAIN COMPONENTS AND THEIR FUNCTIONS
1. MALE QUICK COUPLER - oil exits the pump from this coupler.
2. FEMALE QUICK COUPLER - oil enters in the pump from this coupler.
3. HYDRAULIC MOTOR
4. COUPLING PLATE - fixes the motor to the pump body.
5. RING NUTS - allow to open the pump in few seconds for cleaning and inspection.
6. SUCTION HOLE - liquid is sucked into the pump from this hole.
7. GRILLE - fabricated in stainless steel has the function of elevating the suction hole.
8. PUMP BODY - VOLUTE fabricated in stainless with high resistance to abrasion and
impacts, the internal part is called the “pumping chamber”.
9. CAMLOCK or UNI70 MALE ADAPTOR allow the connection of the discharge hose to the
pump.

8
10. HANDLE - allow to lift the pump either by hand or by crane.
WP 25 TECHNICAL CHARACTERISITCS
TYPE submersible centrifugal pump with open impeller
WEIGHT Kg. 9.5
HEIGHT cm 30 without pig tail hoses
LENGTH cm 30
MATERIAL Aluminium - steel - nylon
OUT PUT FLOW 1600 l/min (96 Cubic mxh)
WATER HEAD (PRESSURE ) 45 metres
DIMENSION OF DISCHARGE HOLE 2 ½” BSP female
CONNECTION OF DISCHARGE HOSE UNI 70 type
DIMENSION OF SOLIDS WHICH CAN BE SUCKED MAX 12 mm
-The WP 25 can run dry without damages.
FLOW 15 - 38 l/min
IDEAL FLOW 30 l/min
PRESSURE 100 - 210 bar
TOLERABLE BACK PRESSURE max 17 bar
EHTMA GROUP C –D
DO NOT EXCEED A FLOW OF 38 l/min TO THE PUMP FOR AVOIDING EXCESS OF BACK
PRESSURE, OIL OVER HEATING AND POSSIBLE DAMAGES TO THE EQUIPMENT.
-THE DISCHARGE HOSE CAN HAVE DIAMETERS FROM 65 mm. TO 75 mm.
(2.1/2” -3”) AND STANDARD LENGTH OF 10 m AND MULTIPLES.
HYDRAULIC CHARACTERISTICS
WEIGHT AND DIMENSIONS
ACCESSORIES - TYPE AND DIMENSIONS
PUMPING PERFORMANCES

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SP20 TECHNICAL CHARACTERISITCS
TYPE submersible centrifugal open impeller
WEIGHT Kg 8
HEIGHT cm 30 without short hoses
LENGTH cm 22
MATERIAL Aluminium –stainless steel
OUT PUT FLOW 800 l/min (48 Cubic mxh)
WATER HEAD (PRESSURE ) 35 metres
DIMENSION OF DISCHARGE HOLE 2” BSP female
CONNECTION OF DISCHARGE HOSE UNI 45 type
DIMENSION OF PUMPABLE SOLIDS MAX 30 mm
- SP20 pump can run dry without damages.
FLOW 15 - 30 l/min
IDEAL FLOW 20 l/min
PRESSURE 100 - 210 bar
TOLERABLE BACK PRESSURE max 17 bar
EHTMA GROUP C –D
DO NOT EXCEED A FLOW OF 30 L/min TO THE PUMPS FOR AVOIDING EXCESS OF BACK
PRESSURE, OIL OVER HEATING AND POSSIBLE DAMAGES TO THE EQUIPMENT.
-DISCHARGE HOSES WITH “UNI 45” CONNECTIONS.
HYDRAULIC CHARACTERISTICS
WEIGHT AND DIMENSIONS
ACCESSORIES - TYPE AND DIMENSIONS
PUMPING PERFORMANCES

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SP 35 TECHNICAL CHARACTERISITCS
TYPE Submersible mono canal closed impeller
WEIGHT Kg 17
HEIGHT cm 37 without short hoses
LENGTH cm 35
MATERIAL Aluminium –stainless steel
OUT PUT FLOW 1600 l/min (96 Cubic mxh)
WATER HEAD (PRESSURE ) 50 metres
DIMENSION OF DISCHARGE HOLE 3” BSP female
CONNECTION OF DISCHARGE HOSE UNI 70 type
DIMENSION OF PUMPABLE SOLIDS MAX 50 mm
- SP 35 pump can run dry without damages.
FLOW 15 - 38 l/min
IDEAL FLOW 30 l/min
PRESSURE 100 - 210 bar
TOLERABLE BACK PRESSURE max 17 bar
EHTMA GROUP C –D
DO NOT EXCEED A FLOW OF and 38 L/min TO THE PUMPS FOR AVOIDING EXCESS OF
BACK PRESSURE, OIL OVER HEATING AND POSSIBLE DAMAGES TO THE EQUIPMENT.
-DISCHARGE HOSES WITH “UNI 70” CONNECTIONS.
HYDRAULIC CHARACTERISTICS
WEIGHT AND DIMENSIONS
ACCESSORIES - TYPE AND DIMENSIONS
PUMPING PERFORMANCES

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SP 45 TECHNICAL CHARACTERISITCS
TYPE submersible centrifugal pump with open impeller
WEIGHT Kg 28
HEIGHT cm 50 without pig tail hoses
LENGTH cm 40
MATERIAL body and impeller in stainless steel –wear plate in urethane
OUT PUT FLOW 3000 l/min (180 Cubic mxh)
WATER HEAD (PRESSURE ) 16 metres
DIMENSION OF DISCHARGE HOLE 4 BSP female
CONNECTION OF DISCHARGE HOSE UNI 100 type
DIMENSION OF SOLIDS WHICH CAN BE SUCKED MAX 70 mm
-The SP 45 pump can run dry without damages.
FLOW 30 - 45 l/min
IDEAL FLOW 38 l/min
PRESSURE 140 - 210 bar
TOLERABLE BACK PRESSURE max 17 bar
EHTMA GROUP D - E
DO NOT EXCEED A FLOW OF 45 l/min TO THE PUMP FOR AVOIDING EXCESS OF BACK
PRESSURE, OIL OVER HEATING AND POSSIBLE DAMAGES TO THE EQUIPMENT.
-DISCHARGE HOSES WITH “UNI 100” CONNECTIONS.
-THE DISCHARGE HOSE CAN HAVE DIAMETERS FROM 85mm TO 100 mm.
(3.1/2” -4”) AND STANDARD LENGTH OF 10 m AND MULTIPLES.
HYDRAULIC CHARACTERISTICS
WEIGHT AND DIMENSIONS
ACCESSORIES - TYPE AND DIMENSIONS
PUMPING PERFORMANCES

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GENERAL SAFETY NORMS
GENERAL SAFETY INSTRUCTIONS.
THE FOLLOWING INSTRUCTIONS ARE GENERAL SAFETY RULES AND HAVE TO
BE RESPECTED IN EVERY WORKS WITH HAND TOOLS. WE RECOMMEND TO
FOLLOW THEM CAREFULLY IN ORDER TO AVOID ACCIDENTS AND DAMAGES TO
THE EQUIPMENT AND THINGS.
Wear ALWAYS the hard-helmet, safety goggles, gloves, safety shoes, ear
protections and, when it is prescribed, a dust musk.
Wear tight-fitting clothes and avoid operating with short trousers or t-shirts, or other
bare parts of the body. Pay attention to long loose hair, gather them to prevent they
get in contact and trapped in moving parts.
Before operating, PREPARE ALWAYS A WORKING PLAN that considers and
foresees problems, interruptions and avoids most of all dangerous situations. This
little operation strategy, guarantees safety and improves productivity.
Pay the maximum attention when you approach the water in steep and slippery
points for preventing falls and accidents. The approaching point to the water should
be the best for granting easy operations and successive easy extraction of the
pump from the water.
Work only in good physical and mental conditions. Always pay the maximum
attention!
When you operate in difficult positions, do not reach out and never lean against the
tool. Keep the balance on your legs.
Be sure that the equipment is in perfect working conditions, without oil leaks.
Keep the protection devices always in good conditions and preserve the readability
of the safety stickers. Do not work with the pump without the impeller protecting
grille.
The working area must be examined and well-known. If you work along roads,
make well visible your position and warn the traffic by the use of signals, flashing
lights, or other prescribed road signs.
Work only if the equipment engines are outside or in a well ventilated point. The
inhalation of exhaust gas can be fatal. The water is an electricity conductor; the
contact of the water with electric lines can cause serious accidents and even death.
Pay the maximum attention when you work near energized electric lines that can be
buried, walled or hidden. Be very careful also to gas and water pipes, telephone
lines or other buried cables or ducts.

13
THE CONTACT OF THE WATER WITH ELECTRIC ENERGIZED LINES
CAN CAUSE SERIOUS ACCIDENTS AND THE DEATH.
The working area must be free from objects that may fall, get spoiled, catch fire, make trip
up or make the operation difficult or dangerous.
Warn and move away imprudent bystanders or other people not authorized or involved with
the job.
If you work in narrow or closed rooms always plan an escape way out that must be kept
free.
Make sure that the operation point is the right one and that there are the proper
authorizations of the owners before starting the works.
Before working always foresee the effect and where the water pumped is going to stop and
plan the opportune defences and counter measures for preventing possible damages or
dangerous situations.
Before using the equipment make sure and prevent vehicles, machines or people from
passing on the equipment discharge hoses or hydraulic connections.
Always connect tools to the operating machine or power pack before starting the engine.
Do not inspect or disassemble the pump with the hydraulic hoses connected to tool.
Keep in a safe dry place this manual and its enclosures, so they can be always available for
future consultations.

14
USE OF THE PRODUCT
WHAT NOT TO DO
THE FOLLOWING RULES ARE GIVEN FOR DESCRIBING THE MORE COMMON ERRORS OR
IMPROPER AND DANGEROUS USE OF THE TOOL.
SINCE IT IS IMPOSSIBLE TO FORESEE ANY ABUSE OR DANGEROUS SITUATIONS, THE RULES
ARE NOT SUFFICIENT TO GUARANTEE THE TOTAL SAFETY.
IT’S RECOMMENDED TO USE ALWAYS THE MAXIMUM CAUTION IN EVERY CIRCUMSTANCE.
IN CASE OF DOUBT DO NOT RISK, BUT ASK YOUR FOREMAN.
WHAT NOT TO DO:
DO NOT START THE PUMP IF THERE COULD BE THE POSSIBILITY OF GETTING IN CONTACT
WITH ENERGIZED ELECTRIC LINES OR PRESSURIZED PIPES.
DO NOT START OR USE THE POWER PACK AND TOOL IN CLOSED ROOMS WITHOUT
VENTILATION, BE CAREFUL IF THERE ARE STRANGE ODOURS, THEY MAY BE DANGEROUS
GASES OR EXHALATIONS.
DO NOT START THE PUMP IF IT IS DAMAGED, IF THERE ARE OIL LEAKS OR SOME PARTS ARE
MISSING OR WRONGLY INSTALLED. IF THE PUMP VIBRATES DURING IDLING, THE IMPELLER
COULD BE DAMAGED AND UNBALANCED, STOP THE OPERATIONS IMMEDIATELY.
DO NOT START THE PUMP CONNECTED TO POWER PACKS OR OTHER EARTH-MOVING
MACHINES WHOSE MAXIMUM VALUES OF PRESSURE AND FLOW ARE NOT KNOWN. IF THE
PUMP IS STARTED WITH FLOWS HIGHER THAN 34 l/min AND PRESSURE HIGHER THAN 150 bar,
THIS CAN CAUSE THE BREAK OF THE EQUIPMENT AND EVEN ACCIDENTS.
DO NOT ALLOW THE USE OF THE EQUIPMENT TO PEOPLE THAT ARE NOT TRAINED OR WHO
HAVE NOT READ THIS MANUAL.
DO NOT WORK IF YOU ARE NOT IN PERFECT PHYSICAL AND MENTAL CONDITIONS.
DO NOT WORK ALONE WHEN IT IS POSSIBLE; MAKE SURE THAT SOMEBODY KNOWS WHERE
YOU ARE AND WHAT YOU ARE DOING.
DO NOT CARRY OUT REPAIRS, INSPECTIONS OR CLEANING OF THE PUMP WITH THE
HYDRAULIC HOSES CONNECTED OR EVEN WORSE WITH THE PUMP WORKING.
DO NOT USE AND DISCARD IMMEDIATELY FLEXIBLE WATER DISCHARGE HOSES BADLY
CONNECTED TO THE METAL ENDS. IMPROVISED FASTENINGS WITH WIRES OR CLAMPS
SHOULD BE AVOIDED FOR PREVENTING ACCIDENTAL REMOVAL OF THE DISCHARGE HOSE
WITH CONSEQUENT DANGEROUS SITUATIONS.
DO NOT WORK, AND IF IT IS NECESSARY PAY THE MAXIMUM ATTENTION, WHEN YOU WORK
ON STEEP AND SLIPPERY BANKS, WHICH COULD CAUSE VERY DANGEROUS FALLS INTO THE
WATER.
DO NOT MAKE THE PUMP WORK HANGED TO THE HOSES. WHEN IT IS POSSIBLE MAKE THE
PUMP WORK LEAVING IT ON THE WATER BOTTOM.

15
BEFORE WORKING
CONNECTION OF THE PUMP TO THE POWER PACK OR OTHER HYDRAULIC SOURCE
1. Lay down the flexible hydraulic hoses avoiding the contact of the couplers with the mud
or dirt.
2. Put the tool on the ground limiting the contact with the dirt. Make sure that the tool is in
perfect condition and its accessories are efficient and well installed.
3. First connect the flexible hoses to the power pack whose engine must be OFF. Connect
the female coupler of the hose to the male coupler of the power pack, and then connect
the other hose.
4. Now connect the flexible hose to the
pump, connecting first the return
hose corresponding to the hole with
a Tor OUT symbol punched on the
tool.
5. Thus the hydraulic connection is
completed.
6. Start the power pack (or other
hydraulic source ) leaving it at idle
for a few minutes allowing engine
and oil warm up
7. Bring the flow lever of the power
pack to ON position making
circulate the oil. Leave the
equipment in this condition for a few
minutes without using the tool and
warming engine and the hydraulic
oil. The pump will start idling
emitting the characteristic noise.
Check that there are not hydraulic
oil leaks.

16
IF CORRECTLY INSTALLED, THE MALE COUPLER OF THE POWER PACK IS THE ONE
CORRESPONDING TO THE PRESSURE LINE, WHERE THE OIL “GETS OUT” FROM THE
POWER PACK, THE CORRECT SEQUENCE OF COUPLERS INSTALLATION DEPENDS ON
THE POSITIONING OF THE FIRST MALE COUPLER.
IF A FLEXIBLE HOSE FULL OF OIL REMAINS UNDER THE SUN, THE OIL EXPANSION DUE
TO THE HEAT CAN CAUSE A PRESSURE INCREASE AND PREVENT THE CONNECTION OF
THE QUICK COUPLERS. IN THIS CASE THE HOSES SHOULD BE DEPRESSURIZED
UNSCREWING THE QUICK COUPLERS DRIPPING SOME OIL DROPS.
IF THE AMBIENT TEMPERATURE IS VERY COLD, THE HEATING OPERATION SHOULD BE
PROLONGED UNTIL THE HYDRAULIC OIL TANK WILL BE WARM TOUCHING IT. DO NOT
WORK IMMEDIATELY IF THE OIL IS COLD. AT LOW TEMPERATURES THE OIL CAN BE
VERY VISCOUS (HARD) AND CAN CAUSE HARMFUL INCREASES IN THE BACK
PRESSURE AND DIFFICULT SUCTION OF THE PUMP ( CAVITATION PHENOMENON )
8. Unroll the discharge hose and lay it on the ground. Connect the water discharge hose to the
pump.
9. The tool is now ready for the starting, prepare a safe approach to the water trying to avoid all
the possible dangerous situations.
10. Direct the final discharge of the discharge hose in the safest and most favourable direction, for
avoiding dangerous situations.
USE OF THE PUMP
Read and follow carefully the instructions described in the previous paragraphs:
PUMPING OPERATIONS
The WP 25 –SP 20 - SP 35 –SP 45 are a submersible pumps.
They suck and pump when are submerged in water. the water is sucked from the suction hole in
the bottom of the pumps body, or from the grille in the model WP 25.
If the pump is layed on a very muddy bottom the excess of mud may plug the suction holes
preventing the normal suction function.

17
DURING PUMPING OPERATIONS IN STEEP AREAS OR WHERE THE ACCESS TO THE
WATER IS DIFFICULT AND DANGEROUS, TRY TO KEEP A GOOD BALANCE AND FORESEE
AN EASY EXTRACTION OF THE PUMP FROM THE WATER.
OPERATIONS OF WATER APPROACHING IN STEEP AND SLIPPERY POINTS COULD
CAUSE FALLS INTO THE WATER AND SERIOUS ACCIDENTS.
DO NOT CARRY OUT CHECKS OR MAINTENANCE OR CLEANING WITH THE PUMP
MOVING IMPELLER OR EVEN WORSE WITHOUT THE PROTECTION GRILLE - AN
ACCIDENTAL CONTACT WITH THE MOVING IMPELLER CAN CAUSE SERIOUS
ACCIDENTS.
DO NOT OPERATE THE PUMP CONNECTED TO POWER PACKS OR MACHINES WICH ARE
NOT KNOW THE MAXIMUM HYDRAULIC VALUES OF PRESSURE AND FLOW.
IF THE PUMP IS OPERATED AT HYDRAULIC FLOWS HIGHER THAN THOSE
RECCOMENDED AND PRESSURES HIGHER THAN 150 bar THIS COULD CAUSE DAMAGE
TO THE EQUIPMENT AND EVEN ACCIDENTS.
1. If it has not ben carried out previously, connect the water discharge hose to the pump being
sure that the assembly has been well connected and the discharge hose is well stretched
without sharp bends and twisting the water should freely flow away.
2. Submerge the pump into the water and direct the free end of the discharge hose in the most
appropriate directions.
3. Open the oil pressure lever of the power pack delivering oil to the pump. The water will begin
to fill the discharge hose going out from the free end.
CHECK THAT THERE ARE NOT OIL SPOTS IN THE WATER. THEY ARE EASILY VISUALIZED
THROUGH THE CHARACTERISTIC IRRIDESCENT SPOTS. IN THIS CASE, TAKE THE PUMP
OUT OF THE WATER, CARRY OUT A CONTROL FOR BEING SURE THAT THERE ARE NOT
OIL LEAKS FROM THE PUMP, FOR PREVENTING HARMFUL OIL LEAKS FROM THE
EQUIPMENT AND POSSIBLE ENVIRONMENTAL DAMAGES.
4. An excessive presence of solid particles in the water could create a sometimes high
decrease in the flow. In this case the pump should be repositioned.
IN CERTAIN CONDITIONS THE PUMPED WATER COULD BE SLOWED DOWN SO THAT THE
SOLID PARTICLES SUSPENDED IN THE LIQUID FALL CONTINUOUSLY INTO THE
“PUMPING CHAMBER” CAUSING FURTHER RESTRICTIONS AND TRANSFORMING THE
IMPELLER INTO A SORT OF MIXER.
THESE DISFAVOURABLE WORKING CONDITIONS DECREASE THE IMPELLER LIFE.
These are the most common causes of flow decrease:
-The pump sinks in the solid material (mud, gravel, leaves, weeds, sediments);
-The head is too high, thus the pump cannot raise and eject the water column;

18
-The pressure and hydraulic flow are low and insufficient thus the pump cannot give
adequate performance;
-The discharge hose makes a too sharp bend, in its length, chocking the water passage.
PUMPING OPERATIONS AT LOW TEMPERATURES
If the ambient temperature is near or below zero centrigades, it is advisable to run the oil in the
hoses at idle for a few minutes until it is lukewarm at contact.
A too viscous –hard oil could cause problems to the hydraulic circuit and the pump itself.
CLEANING OF THE PUMPING CHAMBER
The internal part of the pump, or pumping chamber, can be easily opened for cleaning and
checking. this is necessary when the tool cannot pump because of debris blocked inside.
The pump can be opened and cleaned unscrewing the ring nuts.
This operation can be done also introducing a screwdriver into the ring. the cleaning should be
carried out only with the engine OFF and with the oil hoses disconnected for preventing accidents.
After having eliminated the obstruction, assemble the coupling plate and pertaining ring nuts
tightening them without exaggeration.
END OF THE OPERATIONS
1. Put the flow lever of the power pack in OFF position, extract the pump from the water pulling it
from the discharge hose.
2. Lay the pump on the ground avoiding and limiting contacts with the mud and dirt, if it is
possible.
3. Put the flow lever of the power pack in OFF position, blocking the oil circulation and pressure to
the pump.
4. Stop the engine of the power pack or other hydraulic machine.
5. Disconnect the pump from the oil flexible hose releasing FIRST THE PRESSURE HOSE
corresponding to the hole with P punched on the tool. This operation will prevent accidental
pressure trapping inside the pump.
6. Disconnect the flexible oil hose from the power pack and also the water discharge hose and
discharge the residual water completely. If a viscous liquid or sewage has been pumped, it is

19
advisable to pump clean waters for washing inside and outside the discharge hose and the
pump itself.
7. Roll up the oil flexible hose in circles of about 60 cm of diameter, connecting the quick couplers
at the extremities in the “head/tail” way. This operation will protect the oil couplers against
impacts or scraping and will also help in keeping the hose well rolled up.
8. Roll up the water discharge hose.
9. Store the equipment in a safe place repaired from bumps and atmospheric agents.
10. If the equipment should be transported on vehicles or trucks, take care that it is loaded and
blocked in a proper way for avoiding tilting and damages.
MAINTENANCE AND CARE OF THE PRODUCT
CLEANING OF THE PUMP
The cleaning is very important for the good functioning of the equipment.
A clean product will immediately allow to find oil leaks or causes of malfunctioning.
A clean tool is also more comfortable for the operator and guarantees a firm grip.
CLEANING OF THE GRILLE OF WP 25
The grille of WP 25 should be cleaned carefully before and after every use of the equipment
removing any object or debris which could limit the access of water to the impeller.
Periodically inspect the impeller and its blades that must be in good conditions.
A very worn impeller causes a high reduction in performance and should be replaced promptly.
CLEANING WITH HYDRO CLEANER
The cleaning with hydro cleaner- pressure cleaner assures the best results. Put the tool on a
clean surface or a wooden pallet turning the tool in order that all the surfaces are reached by
the pressure jet. Do not to use too much the water nozzle near the tool to avoid the removal of
safety stickers and paint, in particular if hot water is used.
A HOT WASHING WITH VERY HIGH PRESSURE AND WITH THE NOZZLE VERY CLOSE TO THE
SURFACES, CAN CAUSE THE REMOVAL OF THE PAINT AND SAFETY ADHESIVES AND LABELS
After the pressure washing, let the water drip from the tool also by moving it for helping the
water drain from cavities or recessed points.
With an air gun blow all over the tool eliminating every trace of water and moisture. Insist with
air jet in particular on cavities or recessed points
With the tool perfectly dry, spray a protective-dewatering product (CRC or WD40) on all
chromed parts and near the quick couplers.

20
CLEANING WITH CLOTHS OR PAPER
The tool can also be cleaned with a damp rag, using a brush with gasohol or an air gun for
eliminating all traces of dirt and oil.
Clean in particular the recessed points and cavities and the connection surface of the quick
couplers.
With the tool perfectly dry, spray a protective-dewatering product (CRC-or WD40) on the quick
couplers.
PERIODICAL CONTROLS AND SUBSTITUTION OF THE WEARING
PARTS
EVERY TIME THE EQUIPMENT IS USED :
1. Check the hydraulic oil level of the power pack or other hydraulic source.
2. Clean the pump grille ( of WP 25 ) and the pump itself carefully from any debris.
3. Carry out a general check of the equipment and control the condition of the discharge
hoses with special care to the conditions of the terminal metal parts and clips.
4. Carry out a brief working test at idle with the pump for checking that there are not hydraulic
oil leaks.
EVERY 50 HOURS OF WORK:
1. Carry out all the controls of the previous paragraph.
2. Check that all bolts and fastenings are well tightened and there are not hydraulic oil leaks.
3. Disassemble the protection grille of the impeller and expose the impeller for checking the
wear condition of the blades. Substitute the too worn impellers.
4. Check that the hydraulic oil is transparent, without foam and torbity. In this case substitute it
completely emptying also the oil in the flexible hoses and in the tool.
5. Clean the equipment carefully.
MAINTENANCE OF THE ACCESSORIES
A correct maintenance of the accessories (hydraulic hoses –quick couplers –discharge hoses –
hose metal end fittings –etc.) guarantees the safety, the best performance of the equipment and
reduces the operators’ fatigue.
Accessories not well preserved or in bad conditions may make the operation difficult and can also
cause accidents or dangerous situations.
In order to obtain the best performance it’s important to use the right accessory.