0163728en 002
0807
Engine
WM 650
WM 720
OPERATOR’S MANUAL
0163728EN
WM 650 / WM 720 Table of Contents
1. Foreword 4
2. Emission Control System Information 5
3. Safety Information 16
3.1 Laws Pertaining to Spark Arresters .................................................... 16
3.2 Operating Safety ................................................................................ 17
3.3 Operator Safety while using Internal Combustion Engines ................ 18
3.4 Service Safety .................................................................................... 19
3.5 Safety Labels ...................................................................................... 20
4. Operation 21
4.1 Recommended Fuel ........................................................................... 21
4.2 Before Starting ................................................................................... 21
4.3 To Start / To Stop ............................................................................... 21
5. Maintenance 22
5.1 Periodic Maintenance Schedule (WM 650) ........................................ 22
5.2 Periodic Maintenance Schedule (WM 720) ........................................ 23
5.3 Spark Plug .......................................................................................... 24
5.4 Engine Oil and Filter ........................................................................... 25
5.5 Air Cleaner ......................................................................................... 26
5.6 Storage ............................................................................................... 27
6. Technical Data 28
3
WARNING
1. Foreword
CALIFORNIA
Proposition 65 Warning:
Engine exhaust, some of its constituents, and certain vehicle
components, contain or emit chemicals known to the State of
California to cause cancer and birth defects or other reproductive
harm.
This manual provides information and procedures to safely operate
and maintain this Wacker model. For your own safety and protection
from injury, carefully read, understand and observe the safety
instructions described in this manual.
Keep this manual or a copy of it with the machine. If you lose this
manual or need an additional copy, please contact Wacker
Corporation. This machine is built with user safety in mind; however,
it can present hazards if improperly operated and serviced. Follow
operating instructions carefully! If you have questions about operating
or servicing this equipment, please contact Wacker Corporation.
The information contained in this manual was based on machines in
production at the time of publication. Wacker Corporation reserves the
right to change any portion of this information without notice.
All rights, especially copying and distribution rights, are reserved.
Copyright 2007 by Wacker Corporation.
No part of this publication may be reproduced in any form or by any
means, electronic or mechanical, including photocopying, without
express written permission from Wacker Corporation.
Any type of reproduction or distribution not authorized by Wacker
Corporation represents an infringement of valid copyrights and will be
prosecuted. We expressly reserve the right to make technical
modifications, even without due notice, which aim at improving our
machines or their safety standards.
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Emission Control System Information WM 650 / WM 720
2. Emission Control System Information
Source of Emissions
The combustion process produces carbon monoxide, oxides of
nitrogen, and hydrocarbons. Control of hydrocarbons and oxides of
nitrogen is very important because, under certain conditions, they
react to form photochemical smog when subjected to sunlight. Carbon
monoxide does not react in the same way, but it is toxic.
Wacker utilizes lean carburetor settings and other systems to reduce
the emissions of carbon monoxide, oxides of nitrogen, and
hydrocarbons.
The U.S. and California Clean Air Acts
EPA and California regulations require all manufacturers to furnish
written instructions describing the operation and maintenance of
emission control systems.
The following instructions and procedures must be followed in order to
keep the emissions from your Wacker engine within the emissions
standards.
Tampering and Altering
Tampering with or altering the emission control system may increase
emissions beyond the legal limit. Among those acts that constitute
tampering are:
•Removal or alteration of any part of the intake, fuel, or exhaust
systems.
•Altering or defeating the speed-adjusting mechanism to cause the
engine to operate outside its design parameters.
Problems That May Affect Emissions
If you are aware of any of the following symptoms, have your engine
inspected and repaired by your servicing dealer.
•Hard starting or stalling after starting.
•Rough idle.
•Misfiring or backfiring under load.
•Afterburning (backfiring).
•Black exhaust smoke or high fuel consumption.
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WM 650 / WM 720 Emission Control System Information
Replacement Parts
The emission control systems on your Wacker engine were designed,
built, and certified to conform with EPA and California emissions
regulations. We recommend the use of genuine Wacker parts
whenever you have maintenance done. These original-design
replacement parts are manufactured to the same standards as the
original parts, so you can be confident of their performance. The use
of replacement parts that are not of the original design and quality may
impair the effectiveness of your emission control system.
A manufacturer of an aftermarket part assumes the responsibility that
the part will not adversely affect emission performance. The
manufacturer or rebuilder of the part must certify that use of the part
will not result in a failure of the engine to comply with emission
regulations.
Maintenance
Follow the maintenance schedule. Remember that this schedule is
based on the assumption that your machine will be used for its
designed purpose. Sustained high-load or high-temperature operation,
or use in unusually wet or dusty conditions, will require more frequent
service.
OXYGENATED FUELS
Some conventional gasolines are being blended with alcohol or an
ether compound. These gasolines are collectively referred to as
oxygenated fuels. To meet clean air standards, some areas of the
United States and Canada use oxygenated fuels to help reduce
emissions.
If you use an oxygenated fuel, be sure it is unleaded and meets the
minimum octane rating requirement.
Before using an oxygenated fuel, try to confirm the fuel’s contents.
Some States / Provinces require this information to be posted on the
pump.
The following are EPA-approved percentages of oxygenates:
ETHANOL - (ethyl or grain alcohol) 10% by volume. You may use
gasoline containing up to 10% ethanol by volume. Gasoline containing
ethanol may be marketed under the name “Gasohol”.
MTBE - (methyl tertiary butyl ether) 15% by volume. You may use
gasoline containing up to 15% MTBE by volume.
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Emission Control System Information WM 650 / WM 720
METHANOL - (methyl or wood alcohol) 5% by volume. You may use
gasoline containing up to 5% methanol by volume, as long as it
contains cosolvents and corrosion inhibitors to protect the fuel system.
Gasoline containing more than 5% methanol by volume may cause
starting and/or performance problems. It may also damage metal,
rubber, and plastic parts of your fuel system.
If you notice any undesirable operating symptoms, try another service
station, or switch to another brand of gasoline.
Fuel system damage or performance problems resulting from the use
of an oxygenated fuel containing more than the percentages of
oxygenates mentioned above are not covered under warranty.
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WM 650 / WM 720 Emission Control System Information
EMISSIONS COMPONENT DEFECT WARRANTY COVERAGE
This emission warranty is applicable in all States, except the State of
California.
Wacker Corporation, N92 W15000 Anthony Avenue, Menomonee
Falls, WI 53051-1504, (herein "Wacker") warrant(s) to the initial retail
purchaser and each subsequent owner, that this non-road engine
(herein "engine") has been designed, built, and equipped to conform
at the time of initial sale to all applicable regulations of the U.S.
Environmental Protection Agency (EPA), and that the engine is free of
defects in materials and workmanship which would cause this engine
to fail to conform with EPA regulations during its warranty period.
For the components listed under PARTS COVERED, the service
dealer authorized by Wacker will, at no cost to you, make the
necessary diagnosis, repair, or replacement necessary to ensure that
the engine complies with applicable U.S. EPA regulations.
EMISSISON COMPONENT DEFECT WARRANTY PERIOD
The warranty period for this engine begins on the date of sale to the
initial purchaser and continues for a period of 2 years.
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Emission Control System Information WM 650 / WM 720
PARTS COVERED
Listed below are the parts covered by the Emission Components
Defect Warranty. Some of the parts listed below may require
scheduled maintenance and are warranted up to the first scheduled
replacement point for that part.
(1) Fuel Metering System
(i) Carburetor and internal parts (and/or pressure regulator or fuel
injection system).
(ii) Air/fuel ratio feedback and control system, if applicable.
(iii) Cold start enrichment system, if applicable.
(iv) Regulator assembly (gaseous fuel, if applicable) .
(2) Air Induction System
(i) Intake manifold, if applicable.
(ii) Air filter.
(3) Ignition System
(i) Spark plugs.
(ii) Magneto or electronic ignition system.
(iii) Spark advance/retard system, if applicable.
(4) Exhaust manifold, if applicable
(5) Miscellaneous Items Used in Above Systems
(i) Electronic controls, if applicable.
(ii) Hoses, belts, connectors, and assemblies.
(iii) Filter lock assembly (gaseous fuel, if applicable).
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WM 650 / WM 720 Emission Control System Information
OBTAINING WARRANTY SERVICE
To obtain warranty service, take your engine to the nearest authorized
Wacker service dealer. Bring your sales receipts indicating date of
purchase for this engine. The service dealer authorized by Wacker will
perform the necessary repairs or adjustments within a reasonable
amount of time and furnish you with a copy of the repair order. All parts
and accessories replaced under this warranty become the property of
Wacker.
WHAT IS NOT COVERED
• Conditions resulting from tampering, misuse, improper adjustment (unless they were made by the service dealer authorized by
Wacker during a warranty repair), alteration, accident, failure to
use the recommended fuel and oil, or not performing required
maintenance services.
• The replacement parts used for required maintenance services.
• Consequential damages such as loss of time, inconvenience,
loss of use of the engine or equipment, etc.
• Diagnosis and inspection charges that do not result in warrantyeligible service being performed.
• Any non-authorized replacement part, or malfunction of authorized parts due to use of non-authorized parts.
OWNER'S WARRANTY RESPONSIBILITIES
As the engine owner, you are responsible for the performance of the
required maintenance listed in your owner's manual. Wacker
recommends that you retain all receipts covering maintenance on your
engine, but Wacker cannot deny warranty solely for the lack of receipts
or for your failure to ensure the performance of all scheduled
maintenance. As the engine owner, you should however be aware that
Wacker may deny warranty coverage if your engine or a part has failed
due to abuse, neglect, improper maintenance or unapproved
modifications.
You are responsible for presenting your engine to the nearest service
dealer authorized by Wacker when a problem exists.
If you have any questions regarding your warranty rights and
responsibilities, you should contact the WACKER CORPORATION
Product Support Department (U.S.A. 1-800-770-0957, Canada 1-877977-0775) for the information.
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Emission Control System Information WM 650 / WM 720
THINGS YOU SHOULD KNOW ABOUT THE EMISSION CONTROL
SYSTEM WARRANTY:
MAINTENANCE AND REPAIRS
You are responsible for the proper maintenance of the engine. You
should keep all receipts and maintenance records covering the
performance of regular maintenance in the event questions arise.
These receipts and maintenance records should be transferred to
each subsequent owner of the engine. Wacker reserves the right to
deny warranty coverage if the engine has not been properly
maintained. Warranty claims will not be denied, however, solely
because of the lack of required maintenance or failure to keep
maintenance records.
MAINTENANCE, REPLACEMENT OR REPAIR OF EMISSION
CONTROL DEVICES AND SYSTEMS MAY BE PERFORMED BY
ANY REPAIR ESTABLISHMENT OR INDIVIDUAL; HOWEVER,
WARRANTY REPAIRS MUST BE PERFORMED BY A SERVICE
DEALER AUTHORIZED BY WACKER. THE USE OF PARTS THAT
ARE NOT EQUIVALENT IN PERFORMANCE AND DURABILITY TO
AUTHORIZED PARTS MAY IMPAIR THE EFFECTIVENESS OF THE
EMISSION CONTROL SYSTEM AND MAY HAVE A BEARING ON
THE OUTCOME OF A WARRANTY CLAIM.
If other than the parts authorized by Wacker are used for maintenance
replacements or for the repair of components affecting emission
control, you should assure yourself that such parts are warranted by
their manufacturer to be equivalent to the parts authorized by Wacker
in their performance and durability.
HOW TO MAKE A CLAIM
All repair qualifying under this limited warranty must be performed by
a service dealer authorized by Wacker. In the event that any emissionrelated part is found to be defective during the warranty period, you
shall notify WACKER CORPORATION Product Support Department
(U.S.A. 1-800-770-0957, Canada 1-877-977-0775) and you will be
advised of the appropriate warranty service dealer or service providers
where the warranty repair can be performed.
CALIFORNIA EMISSION CONTROL WARRANTY STATEMENT
YOUR WARRANTY RIGHTS AND OBLIGATIONS
The California Air Resources Board and Wacker Corporation (herein
“Wacker”) are pleased to explain the emissions control system
warranty on your small off-road engine. In California, new small offroad engines must be designed, built and equipped to meet the State's
stringent anti-smog standards. Wacker Corporation must warrant the
emissions control system on your engine for the periods of time listed
below provided there has been no abuse, neglect or improper
maintenance of your engine.
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WM 650 / WM 720 Emission Control System Information
Your emission control system may include parts such as the carburetor
or fuel-injection system, fuel lines and the ignition system. Also
included may be hoses, clamps, connectors and other associated
components.
Where a warrantable condition exists, a Wacker authorized service
center will repair your Wacker engine at no cost to you including
diagnosis, parts and labor.
MANUFACTURER'S WARRANTY COVERAGE:
The emissions control system is warranted for two years. If any
emissions-related part on your engine is defective, the part will be
repaired or replaced by Wacker.
OWNER'S WARRANTY RESPONSIBILITIES:
As the Wacker engine owner, you are responsible for the performance
of the required maintenance listed in your owner's manual. Wacker
recommends that you retain all receipts covering maintenance on your
Wacker engine, but Wacker cannot deny warranty solely for the lack of
receipts.
As the Wacker engine owner, you should however be aware that
Wacker may deny you warranty coverage if your Wacker engine or a
part has failed due to abuse, neglect, improper maintenance or
unapproved modifications.
You are responsible for presenting your Wacker engine to a Wacker
dealer or service center as soon as a problem exists. The warranty
repairs should be completed in a reasonable amount of time, not to
exceed 30 days.
If you have any questions regarding your warranty rights and
responsibilities, you should contact your local Wacker equipment
dealer, service center or the WACKER CORPORATION Product
Support Department (U.S.A. 1-800-770-0957, Canada 1-877-977-
0775) for the information.
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Emission Control System Information WM 650 / WM 720
GENERAL EMISSIONS WARRANTY COVERAGE
- California Only -
Wacker warrants to the ultimate purchaser and each subsequent
purchaser that this small off-road engine (1) has been designed, built
and equipped so as to conform with all applicable regulations; and (2)
is free from defects in materials and workmanship that cause the
failure of a warranted part to conform with those regulations as may be
applicable to the terms and conditions stated below.
A. The warranty period begins on the date the engine is delivered to an
ultimate purchaser or first placed into service. The warranty period is
two years.
B. Subject to certain conditions and exclusions as stated below, the
warranty on emissions related parts is as follows:
1) Any warranted part that is not scheduled for replacement as
required maintenance in your owner’s manual is warranted for the
warranty period stated above. If the part fails during the period of
warranty coverage, the part will be repaired or replaced by
Wacker according to subsection (4) below. Any such part
repaired or replaced under warranty will be warranted for the
remainder of the period.
2) Any warranted part that is scheduled only for regular inspection
in your owner’s manual is warranted for the warranty period
stated above. Any such part repaired or replaced under warranty
will be warranted for the remaining warranty period.
3) Any warranted part that is scheduled for replacement as required
maintenance in your owner’s manual is warranted for the period
of time before the first scheduled replacement date for that part.
If the part fails before the first scheduled replacement, that part
will be repaired or replaced by Wacker according to subsection
(4) below. Any such part repaired or replaced under warranty will
be warranted for the remainder of the period prior to the first
scheduled replacement point for the part.
4) Repair or replacement of any warranted part under the warranty
provisions herein must be performed at a warranty station at no
charge to the owner.
5) Notwithstanding the provisions herein, warranty services or repair
will be provided at all of our distribution centers that are
franchised to service the subject engines.
6) The owner must not be charged for diagnostic labor that leads to
the determination that a warranted part is in fact defective,
provided that such diagnostic work is performed at a warranty
station.
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WM 650 / WM 720 Emission Control System Information
7) Wacker is liable for damages to other engine components
proximately caused by a failure under warranty of any warranted
part.
8) Throughout the engine warranty period stated above, Wacker will
maintain a supply of warranted parts sufficient to meet the
expected demand for such parts.
9) Any replacement part may be used in the performance of any
warranty maintenance or repairs and must be provided without
charge to the owner. Such use will not reduce the warranty
obligations of Wacker.
10) Add-on or modified parts that are not exempted by the Air
Resources Board may not be used. The use of any nonexempted add-on or modified parts by the ultimate purchaser will
be grounds for disallowing a warranty claim. Wacker will not be
liable to warrant failures of warranted parts caused by the use of
a non-exempted add-on or a modified part.
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Emission Control System Information WM 650 / WM 720
C. Warranted Parts:
The repair or replacement of any warranted part otherwise eligible for
warranty coverage may be excluded from such warranty coverage if
Wacker demonstrates that the engine has been abused, neglected, or
improperly maintained, and that such abuse, neglect, or improper
maintenance was the direct cause of the need for repair or
replacement of the part. That notwithstanding, any adjustment of a
component that has a factory installed, and properly operating,
adjustment limiting device is still eligible for warranty coverage. The
following emissions warranty parts list are covered.
1) Fuel Metering System
i) Carburetor and internal parts (and/or pressure regulator or fuel
injection system).
ii) Air/fuel ratio feedback and control system, if applicable.
iii) Cold start enrichment system, if applicable.
iv) Regulator assembly (gaseous fuel, if applicable)
2) Air Induction System
i) Intake manifold, if applicable.
ii) Air filter
3) Ignition System
i) Spark plugs
ii) Magneto or electronic ignition system
iii) Spark advance/retard system, if applicable
4) Exhaust manifold, if applicable
5) Evaporation System
i) Fuel line
ii) Fuel line fittings
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WM 650 / WM 720 Safety Information
3. Safety Information
This manual contains DANGER, WARNING, CAUTION, NOTICE and
NOTE callouts which must be followed to reduce the possibility of
personal injury, damage to the equipment, or improper service.
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that follow this
symbol to avoid possible injury or death.
DANGER indicates a hazardous situation which, if not avoided, will
result in death or serious injury.
DANGER
WARNING indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
WARNING
CAUTION indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
CAUTION
NOTICE: Used without the safety alert symbol, NOTICE indicates a
hazardous situation which, if not avoided, could result in property
damage.
Note: Contains additional information important to a procedure.
3.1 Laws Pertaining to Spark Arresters
Notice: State Health Safety Codes and Public Resources Codes
specify that in certain locations spark arresters be used on internal
combustion engines that use hydrocarbon fuels. A spark arrester is a
device designed to prevent accidental discharge of sparks or flames
from the engine exhaust. Spark arresters are qualified and rated by
the United States Forest Service for this purpose.
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Safety Information WM 650 / WM 720
3.2 Operating Safety
Familiarity and proper training are required for the safe operation of
equipment! Equipment operated improperly or by untrained personnel
can be dangerous! Read the operating instructions contained in this
WARNING
3.2.1 NEVER allow anyone to operate this equipment without proper
3.2.2 NEVER touch the engine or muffler while the engine is on or
3.2.3 NEVER use accessories or attachments that are not recommended by
3.2.4 NEVER leave the machine running unattended.
manual and familiarize yourself with the location and proper use of all
controls. Inexperienced operators should receive instruction from
someone familiar with the equipment before being allowed to operate
the machine.
training. People operating this equipment must be familiar with the
risks and hazards associated with it.
immediately after it has been turned off. These areas get hot and may
cause burns.
Wacker. Damage to equipment and injury to the user may result.
3.2.5 NEVER operate the machine in snow, rain, or standing water.
3.2.6 ALWAYS be sure operator is familiar with proper safety precautions
and operation techniques before using machine.
3.2.7 ALWAYS wear protective clothing appropriate to the job site when
operating the machine.
3.2.8 ALWAYS wear hearing protection when operating equipment.
3.2.9 ALWAYS close fuel valve on engines equipped with one when
machine is not being operated.
3.2.10 ALWAYS store the machine properly when it is not being used. The
machine should be stored in a clean, dry location out of the reach of
children.
3.2.11 ALWAYS operate machine with all safety devices and guards in place
and in working order. DO NOT modify or defeat safety devices. DO
NOT operate machine if any safety devices or guards are missing or
inoperative.
3.2.12 ALWAYS read, understand, and follow procedures in the Operator’s
Manual before attempting to operate the machine.
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WM 650 / WM 720 Safety Information
3.3 Operator Safety while using Internal Combustion Engines
Internal combustion engines present special hazards during operation
and fueling! Read and follow all warning instructions and safety
guidelines in this manual. Failure to follow warnings and safety
DANGER
3.3.1 DO NOT run the machine indoors or in an enclosed area such as a
3.3.2 DO NOT smoke while operating the machine.
3.3.3 DO NOT smoke when refueling the engine.
3.3.4 DO NOT refuel a hot or running engine.
3.3.5 DO NOT refuel the engine near an open flame.
3.3.6 DO NOT spill fuel when refueling the engine.
3.3.7 DO NOT run the engine near open flames.
guidelines could result in severe injury or death.
deep trench unless adequate ventilation, through such items as
exhaust fans or hoses, is provided. Exhaust gas from the engine
contains poisonous carbon monoxide gas; exposure to carbon
monoxide can cause loss of consciousness and may lead to death.
3.3.8 ALWAYS refill the fuel tank in a well-ventilated area.
3.3.9 ALWAYS replace the fuel tank cap after refueling.
3.3.10 ALWAYS check the fuel lines and the fuel tank for leaks and cracks
before starting the engine. Do not run the machine if fuel leaks are
present or the fuel lines are loose.
3.3.11 ALWAYS keep the machine at least one meter (three feet) away from
structures, buildings, and other equipment during use.
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Safety Information WM 650 / WM 720
3.4 Service Safety
A poorly maintained machine can become a safety hazard! In order
for the machine to operate safely and properly over a long period of
time, periodic maintenance and occasional repairs are necessary.
WARNING
3.4.1 DO NOT attempt to clean or service the machine while it is running.
Rotating parts can cause severe injury.
3.4.2 DO NOT crank a flooded engine with the spark plug removed on
gasoline-powered engines. Fuel trapped in the cylinder will squirt out
the spark plug opening.
3.4.3 DO NOT test for spark on gasoline-powered engines if the engine is
flooded or the smell of gasoline is present. A stray spark could ignite
the fumes.
3.4.4 DO NOT use gasoline or other types of fuels or flammable solvents to
clean parts, especially in enclosed areas. Fumes from fuels and
solvents can become explosive.
3.4.5 ALWAYS keep the area around the muffler free of debris such as
leaves, paper, cartons, etc. A hot muffler could ignite the debris and
start a fire.
3.4.6 ALWAYS replace worn or damaged components with spare parts
designed and recommended by Wacker Corporation.
3.4.7 ALWAYS disconnect the spark plug on machines equipped with
gasoline engines, before servicing, to avoid accidental start-up.
3.4.8 ALWAYS keep the machine clean and labels legible. Replace all
missing and hard-to-read labels. Labels provide important operating
instructions and warn of dangers and hazards.
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WM 650 / WM 720 Safety Information
3.5 Safety Labels
Wacker machines use international pictorial labels where needed.
These labels are described below:
Label Meaning
Read the operator's manual for machine information.
WARNING!
Hot surface!
DANGER!
Engines emit carbon monoxide; operate only
in well-ventilated area.
Shut off the engine before refueling.
DANGER!
No sparks, flames or burning objects near
machine.
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Operation WM 650 / WM 720
4. Operation
4.1 Recommended Fuel
The engine requires regular grade unleaded gasoline. Use only fresh,
clean gasoline. Gasoline containing water or dirt will damage fuel
system. Consult engine Owner’s Manual for complete fuel
specifications.
4.2 Before Starting
4.2.1 Read and understand safety and operating instructions at beginning of
this manual.
4.2.2 Check:
• Engine oil level
• Condition of fuel lines
• Condition of air cleaner
• Fuel level
• Tightness of external fasteners.
4.3 To Start / To Stop
See machine's operator’s manual.
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WM 650 / WM 720 Maintenance
5. Maintenance
5.1 Periodic Maintenance Schedule (WM 650)
Wacker
Check fuel level.
Check engine oil level.
Daily
before
starting
After
first
20 hrs.
Inspect air filter. Replace as needed. *
Clean engine head and cylinder fins.
Change engine oil and filter. *
Clean air cleaner. Replace as
needed.
Check and clean spark plug.
Clean sediment cup/fuel filter.
Check and adjust idle speed
Check and adjust valve clearances.
Replace spark plug.
Every
50
hrs.
*
Every
200
hrs.
Every
500
hrs.
* Service more frequently in dusty conditions.
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Maintenance WM 650 / WM 720
5.2 Periodic Maintenance Schedule (WM 720)
Wacker
Check fuel level.
Check engine oil level.
Clean engine head and cylinder fins.
Daily
before
starting
After
first
20 hrs.
Every
50
hrs.
Change engine oil and filter. *
Clean air cleaner element. *
Check and clean spark plug.
Replace fuel filter.
Replace air cleaner element.
Check and adjust idle speed
Check and adjust valve clearances.
Replace spark plug.
Every
100
hrs.
Every
200
hrs.
Every
500
hrs.
* Service more frequently in dusty conditions.
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WM 650 / WM 720 Maintenance
5.3 Spark Plug
See Graphic: wc_gr000028
Clean or replace spark plug as needed to ensure proper operation.
The muffler becomes very hot during operation and remains hot for a
while after stopping the engine. Do not touch the muffler while it is hot.
WARNING
Note: Refer to the Technical Data for the recommended spark plug
type and the electrode gap setting.
5.3.1 Remove spark plug and inspect it.
5.3.2 Replace plug if the insulator is cracked or chipped.
5.3.3 Clean spark plug electrodes with a wire brush.
5.3.4 Set the electrode gap (a).
5.3.5 Tighten spark plug securely.
NOTICE: A loose spark plug can become very hot and may cause
engine damage.
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Maintenance WM 650 / WM 720
5.4 Engine Oil and Filter
See graphic: wc_gr004396
Drain the oil while the engine is still warm. To drain oil:
5.4.1 Remove the filler cap (a) and drain cap (d). Drain oil into a suitable
container.
Note: In the interests of environmental protection, place plastic
sheeting and a container under the machine to collect the liquid which
drains off. Dispose of this liquid properly.
5.4.2 Re-insert the drain cap and tighten.
5.4.3 Fill the engine with the recommended oil to the upper limit mark on the
dipstick (b). See section Technical Data for the oil quantity and type.
Danger of burns! Care must be taken when draining hot engine oil. Hot
oil can burn!
WARNING
To change the filter:
5.4.4 Drain the engine oil. Remove used filter.
5.4.5 Before installing the new filter, lightly oil the filter gasket (c) with fresh,
clean engine oil. Screw the filter on by hand until the gasket makes
contact, then tighten an additional 7/8 turn.
5.4.6 Fill the engine with the recommended oil. See section Technical Data
for oil quantity and type.
5.4.7 Start and run the engine to check for leaks. Stop the engine. Recheck
the oil level and add oil if required. Refer to the engine owner’s manual.
a
c
b
d
WM 720
WM 650
d
wc_gr004396
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WM 650 / WM 720 Maintenance
5.5 Air Cleaner
See Graphic: wc_gr003002
NEVER use gasoline or other types of low flash-point solvents for
cleaning the air cleaner. A fire or explosion could result.
WARNING
NOTICE: NEVER run the engine without the air cleaner. Severe
engine damage will occur.
The engine is equipped with a dual-element air cleaner. Under normal
operating conditions, elements should be cleaned once every week.
Under severe, dry and dusty conditions, the elements should be
maintained daily. Replace an element when it is saturated with dirt that
cannot be removed.
5.5.1 Remove the wing bolt (a) and cover (b).
5.5.2 To clean the paper element (c), tap it lightly on a flat surface. Replace
the paper element if it is damaged or heavily soiled.
5.5.3 To clean the foam element (d), wash it in liquid detergent and water.
Squeeze it dry in a clean cloth. Once dry, saturate the foam element in
engine oil, then squeeze out excess. Replace the foam element if it is
damaged or heavily soiled. Re-install the foam element and reassemble the air cleaner.
a
b
d
c
wc_gr003002
wc_tx000656gb.fm 26
Maintenance WM 650 / WM 720
5.6 Storage
If unit is to be stored for more than 30 days:
5.6.1 Drain fuel from tank. Start engine and run until remaining fuel is used.
5.6.2 Change engine oil.
5.6.3 Remove spark plugs and pour approximately 3 ml (1 ounce) of SAE
30W oil into each engine cylinder through spark plug opening.
5.6.4 Install spark plugs. Leave ignition wires disconnected to prevent
engine from starting. Crank engine for one or two seconds to distribute
oil inside engine cylinders. Connect ignition wires.
5.6.5 Cover engine and store in a clean, dry area.
wc_tx000656gb.fm 27
WM 650 / WM 720 Technical Data
6. Technical Data
WM 650 WM 720
Engine
Engine Type
Engine Make
Rated Power
type
type
kW (Hp)
4-stroke, 2 cylinder, air cooled
Wacker
12.3 (16.5)
@ 3100 rpm
18.6 (25.0)
@ 3600 rpm
15.3 (20.5)
@ 3600 rpm
Displacement
cm³ (in³)
653 (39.9) 720 (44)
Spark Plug NGK-BP6ES NGK-BPR4EY
Electrode Gap
Engine Speed - full load
Engine Speed - idle
mm (in)
rpm
rpm
0.6-0.7 (0.024-0.027)
3100 3600
2000 1400
Valve Clearance (cold)
intake:
exhaust:
Battery
mm (in.)
0.08-0.115 (0.0031-0.0045)
0.08-0.115 (0.0031-0.0045)
V
12VDC
Air Cleaner
Fuel
Starter
Engine Oil
Dimensions (L x W x H)
Dry Weight
Emissions Durability Period
(California Only)
l (qt.)
mm (in.)
kg (lbs.)
type
type
type
type
Dual Element
Regular Unleaded Gasoline
Electric Start
10W30 API class SE minimum
1.55 (1.64)
317 x 477 x 475 (12.5 x 18.8 x 18.7)
44 (97) 46 (101)
500 hours
28
Maintenance WM 650
Notes
29
Wacker Construction Equipment AG · Preußenstraße 41 · D-80809 München · Tel.: +49-(0)89-3 54 02 - 0 · Fax: +49 - (0)89-3 54 02-3 90
Wacker Corporation · P.O. Box 9007 · Menomonee Falls, WI 53052-9007 · Tel. : (262) 255-0500 · Fax: (262) 255-0550 · Tel. : (800) 770-0957
Wacker Asia Pacific Operations · Skyline Tower, Suite 2303, 23/F · 39 Wang Kwong Road, Kowloon Bay, Hong Kong · Tel. +852 2406 60 32 · Fax: +852 2406 60 21
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