LONCIN 25ZB21-1.2Q User manual

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Thank you for purchasing a water pump.
This manual covers the operation and maintenance of water pump: 25ZB21-1.2Q。
The information and specifications included in this publication were in effect at the time of
approval for printing.
General-purpose Engine Co., Ltd. Reserves the right to make changes at any time
without notice and without incurring any obligation.
No part of this publication may be reproduced without written permission.
This manual should be considered a permanent part of the pump and should remain with
the pump if it is resold.
The illustrations in this manual are based in: 80ZB20-3.1Q
The illustration may vary according to the type.
Keep this owner’s manual handy, so you can refer to it at any time. This owner’s manual is
considered a permanent part of the water pump and should remain with the water pump if
resold.
If a problem should arise, or if you have any questions about the pump, consult an
authorized dealer.
Nomenclature
Based in: 25ZB21-1.2Q
25 ZB 21 – 1.2 Q
Gasoline Engine
Rated Power 3.1kW
Rated Discharge Head
Centrifugal Pump
Water Inlet/Outlet Diameter

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CONTENTS
1.INFORMATION ……………………………………………………………………………2
2. COMPONENT …………………………………………………………………………… 6
3. CONTROLS ……………………………………………………………………………7
4. CHECK BEFORE OPERATION …………………………………………………………9
5. OPERATION ……………………………………………………………………………10
6. MAINTENANCE ……………………………………………………………………………14
7. STORAGE/ TRANSPORTING …………………………………………………………23
8．
．．
．TROUBLESHOOTING …………………………………………………………………26
9. TECHNICAL & CONSUMER INFORMATION ………………………………………27
10. SPECIFICATIONS ………………………………………………………………………29
11. ENGINE TYPE WITH OIL ALERT AND WITHOUT ELECTRIC STARTING
………………………………………………………………………………………30
12.OPERATION ……………………………………………………………………………31

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1.INFORMATION
Thank you for purchasing a water pump.
The information and specifications included in this publication
were in effect at the time of approval for printing.
No part of this publication may be reproduced without written
permission.
This manual should be considered a permanent part of the pump
and should remain with the pump if it is resold.
The illustrations in this manual are based in: 25ZB21-1.2Q
The illustration may vary according to the type.
Keep this owner's manual handy, so you can refer to it at any time.
This owner's manual is considered a permanent part of the water
pump and should remain with the water pump if resold.
If a problem should arise, or if you have any questions about the
pump, consult you authorized dealer.

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Your safety and the safety of others are very important. And using this
water pump safely is an important responsibility.
To help you make informed decisions about safety, we have provided
operating procedures and other information on labels and in this
manual. This information alerts you to potential hazards that could hurt
you or others.
Of course, it is not practical or possible to warn you about all the
hazards associated with operating or maintaining a water pump. You
must use your own good judgment.
You will find important safety information in a variety of forms,
including:
Safety Labels on the pump.
Safety Messages preceded by a safety alert symbol and one of three
signal words, DANGER, WARNING, or CAUTION. These signal words
mean:
You WILL be KILLED or SERIOUSLY HURT if you don't follow
instructions.
You CAN be KILLED or SERIOUSLY HURT if you don't follow
instructions.
You CAN be HURT if you don't follow instructions.
Your pump or other property could be damaged if you don't follow
instructions.
Safety Headings such as IMPORTANT SAFETY INFORMATION.
Safety Section such as PUMP SAFETY.
Instructions how to use this pump correctly and safely.
This entire book is filled with important safety information, please read
it carefully.

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IMPORTANT SAFETY INFORMATION
This water pump is designed to pump only water that is not intended for
human consumption, and other uses can result in injury to the operator
or damage to the pump and other property.
Always make a pre-operation inspection before you start the engine.
You may prevent an accident or equipment damage.
Most accidents can be prevented if you follow all instructions in this
manual and on the pump. The most common hazards are discussed
below, along with the best way to protect yourself and others.
Operator Responsibility
It is the operator's responsibility to provide the necessary safeguards to
protect people and property. Know how to stop the pump quickly in
case of emergency.
If you leave the pump for any reason, always turn the engine off.
Understand the use of all controls and connections.
Be sure that anyone who operates the pump receives proper instruction.
Do not let children operate the pump. Keep children and pets away from
the area of operation.
Pump Operation
Pump only water that is not intended for human consumption. Pumping
flammable liquids, such as gasoline or fuel oils, can result in a fire or
explosion, causing serious injury. Pumping sea water, beverages, acids,
chemical solutions, or any other liquid that promotes corrosion can
damage the pump.
Refuel With Care
Gasoline is extremely flammable, and gasoline vapor can explode.
Refuel outdoors, in a well-ventilated area, with the engine stopped and
the pump on a level surface. Do not fill the fuel tank above the fuel
strainer shoulder. Never smoke near gasoline, and keep other flames
and sparks away. Always stored gasoline in an approved container.

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Make sure that any spilled fuel has been wiped up before starting the
engine. After refueling, make sure the tank cap closed properly and
securely.
Hot Exhaust
The muffler becomes very hot during operation and remains hot for a
while after stopping the engine. Be careful not to touch the muffler while
it is hot. Let the engine cool before transporting the pump or storing it
indoors.
To prevent fire hazards, keep the pump at least 3 feet (1 meter) away
from building walls and other equipment during operation. Do not place
flammable objects close to the engine.
Carbon Monoxide Hazard Exhaust gas contains poisonous carbon
monoxide. Avoid inhalation of exhaust gas. Never run the engine in a
closed garage or confined area.

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2. COMPONENT
`

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3. CONTROLS
Fuel Valve Lever
The fuel valve opens and closes the passage between the fuel tank and the carburetor.
The fuel valve lever must be in the ON position for the engine to run.
When the engine is not in use, leave the fuel valve lever in the OFF position to prevent
carburetor flooding and to reduce the possibility of fuel leakage.
Throttle Lever
The throttle lever controls engine speed.
Moving the throttle lever in the directions shown makes the engine run faster or slower.
Engine Switch
The engine switch enables and disables the ignition system.
The engine switch must be in the ON position for the engine to run.
Turning the engine switch to the OFF position stops the engine.
FUEL VALVE
O N
T H R O T T L E L E V E R
H I G H SPEE D
L O W SPE E D

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Choke Lever
The choke lever opens and closes the choke valve in the carburetor.
The CLOSE position enriches the fuel mixture for starting a cold engine.
The OPEN position provides the correct fuel mixture for operation after starting, and for
restarting a warm engine.
Some engine applications use a remotely-mounted choke control rather than the
engine-mounted choke lever shown here.
Recoil Starter Grip
Pulling the starter grip operates the recoil starter to crank the engine.
ENGINE SWITCH
OFF
O N
OFF
O N
CHOKE LEVER

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4. CHECK BEFORE OPERATION
IS YOUR ENGINE READY TO GO?
For your safety, and to maximize the service life of your equipment, it is very important to
take a few moments before you operate the engine to check its condition. Be sure to take
care of any problem you find, or have your servicing dealer correct it, before you operate
the engine.
Improperly maintaining this engine
or failure to correct a problem
before operation, could cause a
malfunction in which you could be
seriously injured.
Always perform a preoperation
inspection before each operation,
and correct any problem.
Before beginning your preoperation checks, be sure the engine is level and the engine
switch is in the OFF position.
Check the General Condition of the Engine
Look around and underneath the engine for signs of oil or gasoline leaks.
Remove any excessive dirt or debris, especially around the muffler and recoil starter.
Look for signs of damage.
Check that all shields and covers are in place, and all nuts, bolts, and screws are
tightened.
Check the Engine
Check the engine oil level. Running the engine with a low oil level can cause engine
damage.
The Oil Alert system (applicable engine types) will automatically stop the engine before the
oil level falls below safe limits. However, to avoid the inconvenience of an unexpected
shutdown, always check the engine oil level before startup.
Check the air filter. A dirty air filter will restrict air flow to the carburetor, reducing engine
performance.
Check the fuel level. Starting with a full tank will help to eliminate or reduce operating
interruptions for refueling.
Check the Equipment Powered by This Engine
Review the instructions provided with the equipment powered by this engine for any
precautions and procedures that should be followed before engine startup.

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5. OPERATION
SAFE OPERATING PRECAUTIONS
Before operating the engine for the first time, please review the IMPORTANT SAFETY
INFORMATION and the chapter titled BEFORE OPERATION.
Carbon monoxide gas is toxic.
Breathing it can cause
unconsciousness and even kill you.
Avoid any areas or actions that
expose you to carbon monoxide.
Review the instructions provided with the equipment powered by this engine for any safety
precautions that should be observed in conjunction with engine startup, shutdown, or
operation.
STARTING THE ENGINE
1. Move the fuel valve lever to the ON position.
2. To start a cold engine, move the choke lever to the CLOSE position.
To restart a warm engine, leave the choke lever in the OPEN position.
Some engine applications use a remotely-mounted choke control rather than the
engine-mounted choke lever shown here.

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3. Move the throttle lever away from the SLOW position, about 1/3 of the way toward the
FAST position.
Some engine applications use a remotely-mounted throttle control rather than the
engine-mounted throttle lever shown here.
4. Turn the engine switch to the ON position.
5. Operate the starter.
RECOIL STARTER (all engine types):
Pull the starter grip lightly until you feel resistance, then pull briskly.
Return the starter grip gently.
O F F
O N
CH OKE L EV ER
THROTTLE LEVER
HIGH SPEED
LOW SPEED
ENGINE SWITCH
OFF
O N

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6. If the choke lever has been moved to the CLOSE position to start the engine, gradually
move it to the OPEN position as the engine warms up.
STOPPING THE ENGINE
To stop the engine in an emergency, simply turn the engine switch to the OFF position.
Under normal conditions, use the following procedure.
1. Move the throttle lever to the SLOW position.
Some engine applications use a remotely-mounted throttle control rather than the
engine-mounted throttle lever shown here.
HIGH SPEED

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2. Turn the engine switch to the OFF position.
3. Turn the fuel valve lever to the OFF position.
SETTING ENGINE SPEED
Position the throttle lever for the desired engine speed.
Some engine applications use a remotely-mounted throttle control rather than the
engine-mounted throttle lever shown here.
For engine speed recommendations, refer to the instructions provided with the equipment
powered by this engine.
TH RO T TL E L E V E R
H I G H S P E ED
L OW S PE ED
HIGH SPEED

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6. MAINTENANCE
THE IMPORTANCE OF MAINTENANCE
Good maintenance is essential for safe, economical, and trouble-free operation. It will also
help reduce air pollution.
Improperly maintaining this engine,
or failure to correct a problem
before operation, can cause a
malfunction in which you can be
seriously hurt or killed.
Always follow the inspection and
maintenance recommendations and
schedules in this owner’s manual.
To help you properly care for your engine, the following pages include a maintenance
schedule, routine inspection procedures, and simple maintenance procedures using basic
hand tools. Other service tasks that are more difficult, or require special tools, are best
handled by professionals and are normally performed by a technician or other qualified
mechanic.
The maintenance schedule applies to normal operating conditions. If you operate your
engine under unusual conditions, such as sustained high-load or high-temperature
operation, or use in unusually wet or dusty conditions, consult your servicing dealer for
recommendations applicable to your individual needs and use.
MAINTENANCE SAFETY
Some of the most important safety precautions are as follows: However, we cannot warn
you of every conceivable hazard that can arise in performing maintenance. Only you can
decide whether or not you should perform a given task.
Failure to properly follow
maintenance instructions and
precautions can cause you to be
seriously hurt or killed.
Always follow the procedures and
precautions in the owner’s manual.
Safety Precautions

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Make sure the engine is off before you begin any maintenance or repairs. This will
eliminate several potential hazards:
Carbon monoxide poisoning from engine exhaust.
Be sure there is adequate ventilation whenever you operate the engine.
Burns from hot parts.
Let the engine and exhaust system cool before touching.
Injury from moving parts.
Do not run the engine unless instructed to do so.
Read the instructions before you begin, and make sure you have the tools and skills
required.
To reduce the possibility of fire or explosion, be careful when working around gasoline.
Use only a nonflammable solvent, not gasoline, to clean parts. Keep cigarettes, sparks
and flames away from all fuel-related parts.
Remember that your servicing dealer knows your engine best and is fully equipped to
maintain and repair it.
To ensure the best quality and reliability, use only new, genuine parts or their equivalents
for repair and replacement.
MAINTENANCE SCHEDULE
 Emission-related items.
☆ Replace the paper element type only.
REGULAR SERVICE PERIOD
Performed at every indicated month or
operating hour interval, whichever comes
first.
ITEM
Each
use
First
month or
20 Hrs.
Every 3
months or
50 Hrs.
Every 6
months or
100 Hrs.
Every
year or
300 Hrs.
Check level ○
●
●●
●
Engine oil Change ○○
Check ○
Clean ○(1)
●
●●
●
Air cleaner Replace ○☆
●
●●
●
Sediment Cup Clean ○
Check-Clean ○
●
●●
●
Spark plug Replace ○
Spark arrester
(optional parts) Clean ○
●
●●
●
Idle speed Check-Adjust ○(2)
●
●●
●
Valve clearance Check-Adjust ○(2)
●
●●
●
Fuel tank and strainer
Clean ○(2)
●
●●
●
Combustion chamber Clean After every 300 Hrs. (2)
●
●●
●
Fuel line Check Every 2 years (Replace if necessary) (2)

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（1）Service more frequently when used in dusty areas.
（2）These items should be serviced by your servicing dealer unless you have the proper
tools and are mechanically proficient. Refer to manual for service procedures.
REFUELING
Fuel tank capacities
152F: 0.47 US qt (1.4L)
With the engine stopped, remove the fuel tank cap and check the fuel level. Refill the tank
if the fuel level is low.
Gasoline is highly flammable and
explosive. You can be burned or
seriously injured when handling fuel.
 Stop the engine and keep heat,
sparks, and flame away.
 Handle fuel only outdoors.
 Wipe up spills immediately.
Refuel in a well-ventilated area before starting the engine. If the engine has been running,
allow it to cool. Refuel carefully to avoid spilling fuel. Do not fill above the fuel strainer
shoulder. After refueling, tighten the fuel tank cap securely.
Never refuel the engine inside a building where gasoline fumes may reach flames or
sparks. Keep gasoline away from appliance pilot lights, barbecues, electric appliances,
power tools, etc.
Spilled fuel is not only a fire hazard, it causes environmental damage. Wipe up spills
immediately. Fuel can damage paint and plastic. Be careful not to spill fuel when
filling your fuel tank. Damage caused by spilled fuel is not covered
under warranty.
Maximum fuel level

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FUEL RECOMMENDATIONS
Use unleaded gasoline with a pump octane rating of 86 or higher.
These engines are certified to operate on unleaded gasoline. Unleaded gasoline produces
fewer engine and spark plug deposits and extends exhaust system life.
Never use stale or contaminated gasoline or an oil/gasoline mixture. Avoid getting dirt or
water in the fuel tank.
Occasionally you may hear a light ‘‘spark knock’’ or ‘‘pinging’’ (metallic rapping noise) while
operating under heavy loads. This is no cause for concern.
If spark knock or pinging occurs at a steady engine speed, under normal load, change
brands of gasoline. If spark knock or pinging persists, see an authorized servicing dealer.
Running the engine with persistent spark knock or pinging can cause engine
damage.
Running the engine with persistent spark knock or pinging is considered misuse,
and the Distributor’s Limited Warranty does not cover parts damaged by misuse.
ENGINE OIL LEVEL CHECK
Check the engine oil level with the engine stopped and in a level position.
1. Remove the filler cap/dipstick and wipe it clean.
2. Insert and remove the dipstick without screwing it into the filler neck. Check the oil level
shown on the dipstick.
机油标尺
UPPER LIMIT
LOWER LIMIT
Oil FILLER CAP/
DIPSTICK

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3. If the oil level is low, fill to the edge of the oil filler hole with the recommended oil.
4. Screw in the filler cap/dipstick securely.
Running the engine with a low oil level can cause engine
damage.
The Oil Alert system (applicable engine types) will automatically stop the engine before the
oil level falls below safe limit. However, to avoid the inconvenience of an unexpected
shutdown, always check the engine oil level before startup.
ENGINE OIL CHANGE
Drain the used oil while the engine is warm. Warm oil drains quickly and completely.
1. Place a suitable container below the engine to catch the used oil, and then remove the
filler cap/dipstick and the drain plug.
2. Allow the used oil to drain completely, and then reinstall the drain plug, and tighten it
securely.
Please dispose of used motor oil in a manner that is compatible with the environment.
We suggest you take used oil in a sealed container to your local recycling center or
service station for reclamation. Do not throw it in the trash; pour it on the ground; or
down a drain.
3. With the engine in a level position, fill to the outer edge of the oil filler hole with the
recommended oil.
Engine oil capacities:
152F: 0.48 US qt ( 0. 45 L)
Running the engine with a low oil level can cause engine damage.
The Oil Alert system (applicable engine types) will automatically stop the engine before
the oil level falls below the safe limit.
However, to avoid the inconvenience of an unexpected shutdown, fill to the upper limit,
and check the oil level regularly.