Wacker Neuson WM 130 Operating instructions

5000192069 03 0313
5000192069
Repair Manual
Engine
WM 130
WM 170
WM 270
EN

Copyright
notice
© Copyright 2013 by Wacker Neuson Production Americas LLC
All rights, including copying and distribution rights, are reserved.
This publication may be photocopied by the original purchaser of the machine. Any
other type of reproduction is prohibited without express written permission from
Wacker Neuson Production Americas LLC.
Any type of reproduction or distribution not authorized by Wacker Neuson Production
Americas LLC represents an infringement of valid copyrights. Violators will be
prosecuted.
Trademarks All trademarks referenced in this manual are the property of their respective owners.
Manufacturer Wacker Neuson Production Americas LLC
N92W15000 Anthony Avenue
Menomonee Falls, WI 53051 U.S.A.
Tel: [phone] · Fax: [phone] · Tel: [phone]
www.wackerneuson.com

WM 130 / 170 / 270 Foreword
wc_tx003288gb.fm 3
Foreword
Machine
documentation
From this point forward in this documentation, Wacker Neuson Production
Americas LLC will be referred to as Wacker Neuson.
Keep a copy of the Operator’s Manual with the machine at all times.
Use the separate Parts Book supplied with the machine to order replacement
parts.
If you are missing any of these documents, please contact Wacker Neuson to
order a replacement or visit www.wackerneuson.com.
When ordering parts or requesting service information, be prepared to provide
the machine model number, item number, revision number, and serial number.
Expectations
for
information in
this manual
This manual provides information and procedures to repair the above Wacker
Neuson model(s). For your own safety and to reduce the risk of injury, carefully
read, understand, and observe all instructions described in this manual.
Wacker Neuson expressly reserves the right to make technical modifications,
even without notice, which improve the performance or safety standards of its
machines.
The information contained in this manual is based on machines manufactured
up until the time of publication. Wacker Neuson reserves the right to change
any portion of this information without notice.
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.
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. In order to
comply with local laws regarding spark arresters, consult the engine distributor or
the local Health and Safety Administrator.
Manufacturer’s
approval
This manual contains references to approved parts, attachments, and
modifications. The following definitions apply:
Approved parts or attachments are those either manufactured orprovided by
Wacker Neuson.
Approved modifications are those performed by an authorized Wacker
Neuson service center according to written instructions published by Wacker
Neuson.
Unapproved parts, attachments, and modifications are those that do not
meet the approved criteria.
Unapproved parts, attachments, or modifications may have the following
consequences:
Serious injury hazards to the operator and persons in the work area
Permanent damage to the machine which will not be covered under warranty

Foreword WM 130 / 170 / 270
4 wc_tx003288gb.fm
Contact your Wacker Neuson dealer immediately if you have questions about
approved or unapproved parts, attachments, or modifications.

wc_br5000192069_03TOC.fm 5
Table of ContentsWM 130/170/270
Foreword 3
1 Safety Information 9
1.1 Operating Safety ................................................................................ 10
1.2 Operator Safety while Using Internal Combustion Engines ............... 10
1.3 Service Safety .................................................................................... 12
1.4 Safety Labels ...................................................................................... 13
2 Operation 14
2.1 Recommended Fuel ........................................................................... 14
2.2 Before Starting ................................................................................... 14
2.3 To Start ............................................................................................... 15
2.4 To Stop ............................................................................................... 15
3 Maintenance 16
3.1 Maintaining the Emission Control System .......................................... 16
3.2 Periodic Maintenance Schedule ......................................................... 16
3.3 Spark Plug .......................................................................................... 17
3.4 Engine Oil ........................................................................................... 18
3.5 Cleaning the Fuel Strainer .................................................................. 19
3.6 Servicing the Air Cleaner .................................................................... 20
3.7 Storage ............................................................................................... 21
4 Technical Data 22
5 Emission Control Systems Information and Warranty 23
5.1 Emission Control System Background Information ............................ 23
5.2 Limited Defect Warranty for Wacker Neuson Emission Control
Systems .............................................................................................. 24
6 Theory of Operation 28
6.1 Component Descriptions .................................................................... 28
6.2 Cross Section Across Shaft ................................................................ 33
6.3 Components—Cross Section Across Shaft ........................................ 34
6.4 Cross Section Along Shaft ................................................................. 35
6.5 Components—Cross Section Along Shaft ......................................... 36

6 wc_br5000192069_03TOC.fm
Table of Contents WM 130/170/270
7 Teardown/Rebuild Procedures 37
7.1 Tools ....................................................................................................37
7.2 Ordering Parts .....................................................................................37
7.3 Reference Numbers ( ) ........................................................................37
8 Disassembly Procedures 38
8.1 Draining Oil ..........................................................................................38
8.2 Removing Air Cleaner .........................................................................39
8.3 Removing Stop Switch, Recoil Starter, and Blower Housing ..............40
8.4 Removing Fuel Tank, Muffler, and Muffler Cover ................................41
8.5 Removing Governor, Carburetor, and Speed Control Lever ...............42
8.6 Removing Ignition Coil, Starter Pulley, and Flywheel ..........................43
8.7 Removing Case Baffle, Charge Coil, and Spark Plug .........................44
8.8 Removing Rocker Cover and Rocker Arm (older) ...............................45
8.9 Removing Rocker Cover and Rocker Arm (newer) .............................46
8.10 Removing Main Bearing Cover ...........................................................47
8.11 Removing Tensioner and Camshaft ....................................................48
8.12 Removing Cylinder Head and Valves ..................................................49
8.13 Removing Connecting Rod and Piston ...............................................50
8.14 Removing Crankshaft and Oil Sensor .................................................51
9 Reassembly Procedures 52
9.1 Notes on Reassembly .........................................................................52
9.2 Oil Sensor ............................................................................................52
9.3 Crankshaft ...........................................................................................53
9.4 Piston and Piston Rings ......................................................................54
9.5 Piston and Connecting Rod .................................................................55
9.6 Connecting Rod ...................................................................................56
9.7 Intake and Exhaust Valves ..................................................................57
9.8 Chain Guide ........................................................................................58
9.9 Cylinder Head ......................................................................................59
9.10 Setting the Timing Chain .....................................................................60
9.11 Mounting the Camshaft on the Cylinder Head ....................................61
9.12 Balancer Shaft Option (WM 270 only) .................................................62
9.13 Main Bearing Cover .............................................................................62
9.14 Mounting Rocker Arms ........................................................................63
9.15 Valve Clearance Adjustment ...............................................................64
9.16 Rocker Cover and Spark Plug .............................................................65
9.17 Case Baffle ..........................................................................................66
9.18 Flywheel and Starter Pulley .................................................................67

wc_br5000192069_03TOC.fm 7
Table of ContentsWM 130/170/270
9.19 Ignition Coil ......................................................................................... 67
9.20 Speed Control Assembly and Carburetor ........................................... 68
9.21 Governor Lever .................................................................................. 69
9.22 Air Cleaner Base ................................................................................ 70
9.23 Governor System Adjustment ............................................................ 70
9.24 Muffler ................................................................................................ 71
9.25 Fuel Tank ........................................................................................... 72
9.26 Blower Housing and Recoil Starter .................................................... 73
9.27 Stop Switch ........................................................................................ 74
9.28 Air Cleaner ......................................................................................... 75
9.29 External Inspection ............................................................................. 76
9.30 Engine Oil ........................................................................................... 76
9.31 Filling Engine With Oil ........................................................................ 77
9.32 Break-in Operation ............................................................................. 78
10 Sub Systems 79
10.1 Automatic Decompression System .................................................... 79
10.2 Fuel System Diagram ...................................................................... 80
10.3 Carburetor .......................................................................................... 81
10.4 Carburetor Overhaul ........................................................................... 82
10.5 Carburetor Exploded View ................................................................. 83
10.6 Recoil Starter ...................................................................................... 84
10.7 Checking the Recoil Starter After Reassembly .................................. 88
10.8 Other Starter Checks .......................................................................... 89
11 Electrical 90
11.1 Magneto ............................................................................................. 90
11.2 Inspecting the Magneto ...................................................................... 90
11.3 WM 130/WM170 Ignition Coil Internal Circuit ..................................... 91
11.4 Basic Theory ...................................................................................... 91
11.5 WM 270 Ignition Coil Internal Circuit .................................................. 92
11.6 Ignition Timing Characteristics ........................................................ 92
11.7 WM 270 Basic Theory ........................................................................ 93
11.8 Wiring Diagram ................................................................................... 94
12 Clearance Data and Limits Table 95
12.1 Term Descriptions .............................................................................. 95

8 wc_br5000192069_03TOC.fm
Table of Contents WM 130/170/270
13 Troubleshooting 104
13.1 Troubleshooting Table .......................................................................104

WM 130 / 170 / 270 Safety Information
wc_si000090gb.fm 9
1 Safety Information
This manual contains DANGER, WARNING, CAUTION, NOTICE, and
NOTE signal words 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.
WARNING indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE:Used without the safety alert symbol, NOTICE indicates a
situation which, if not avoided, could result in property damage.
Note: Contains additional information important to a procedure.
DANGER
WARNING
CAUTION

Safety Information WM 130 / 170 / 270
10 wc_si000090gb.fm
1.1 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
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.
1.1.1 Do not allow anyone to operate this equipment without proper training.
People operating this equipment must be familiar with the risks and
hazards associated with it.
1.1.2 Do not touch the engine or muffler while the engine is on or
immediately after it has been turned off. These areas get hot and may
cause burns.
1.1.3 Do not use accessories or attachments that are not recommended by
Wacker Neuson. Damage to equipment and injury to the user may
result.
1.1.4 Do not leave the machine running unattended.
1.1.5 Be sure operator is familiar with proper safety precautions and
operation techniques before using machine.
1.1.6 Always wear protective clothing appropriate to the job site when
operating the machine.
1.1.7 Wear hearing protection when operating equipment.
1.1.8 Close fuel valve on engines equipped with one when machine is not
being operated.
1.1.9 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.
1.1.10 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.
1.1.11 Read, understand, and follow procedures in the Operator’s Manual
before attempting to operate the machine.
1.2 Operator Safety while Using Internal Combustion Engines
WARNING

WM 130 / 170 / 270 Safety Information
wc_si000090gb.fm 11
Operating safety
When running the engine:
• Keep the area around exhaust pipe free of flammable materials.
• 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.
When running the engine:
• Do not smoke while operating the machine.
• Do not run the engine near sparks or open flames.
• Do not touch the engine or muffler while the engine is running or
immediately after it has been turned off.
• Do not operate a machine when its fuel cap is loose or missing.
• Do not start the engine if fuel has spilled or a fuel odor is present.
Move the machine away from the spill and wipe the machine dry
before starting.
Refueling safety
When refueling the engine:
• Clean up any spilled fuel immediately.
• Refill the fuel tank in a well-ventilated area.
• Replace the fuel tank cap after refueling.
• Do not smoke.
• Do not refuel a hot or running engine.
• Do not refuel the engine near sparks or open flames.
DANGER
Exhaust gas from the engine contains carbon monoxide, a deadly poison.
Exposure to carbon monoxide can kill you in minutes.
fNEVER operate the machine inside an enclosed area, such as a tunnel, unless
adequate ventilation is provided through such items as exhaust fans or hoses.

Safety Information WM 130 / 170 / 270
12 wc_si000090gb.fm
1.3 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.
1.3.1 Do not attempt to clean or service the machine while it is running.
Rotating parts can cause severe injury.
1.3.2 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.
1.3.3 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.
1.3.4 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.
1.3.5 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.
1.3.6 Replace worn or damaged components with spare parts designed and
approved by Wacker Neuson.
1.3.7 Disconnect the spark plug on machines equipped with gasoline
engines, before servicing, to avoid accidental start-up.
1.3.8 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.
WARNING

WM 130 / 170 / 270 Safety Information
wc_si000090gb.fm 13
1.4 Safety Labels
Wacker Neuson 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.

Operation WM 130 / 170 / 270
14 wc_tx000241gb.fm
2 Operation
2.1 Recommended Fuel
This engine is certified to operate on automotive unleaded gasoline. Use only fresh, clean gasoline.
Gasoline containing water or dirt will damage fuel system.
Use of oxygenated fuels
Some conventional gasolines are blended with alcohol. These
gasolines are collectively referred to as oxygenated fuels. If you use
an oxygenated fuel, be sure it is unleaded and meets the minimum
octane rating requirement.
Before using an oxygenated fuel, confirm the fuel's contents. Some
states and provinces require this information to be posted on the fuel
pump.
The following is the Wacker Neuson approved percentage of
oxygenates:
ETHANOL - (ethyl or grain alcohol) 10% by volume. You may use
gasoline containing up to 10% ethanol by volume (commonly referred
to as E10). Gasoline containing more than 10% ethanol (such as E15,
E20, or E85) may not be used because it could damage the engine.
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.
2.2 Before Starting
2.2.1 Read and understand safety and operating instructions at beginning of
this manual.
2.2.2 Check:
• Oil level in engine.
• Fuel level.
• Condition of air cleaner.
• Tightness of external fasteners.

WM 130 / 170 / 270 Operation
wc_tx000241gb.fm 15
2.3 To Start
See Graphic: wc_gr000655
2.3.1 Open fuel valve by moving lever down (a1).
Note: If engine is cold, move choke lever to close position (d2). If
engine is hot, set choke to open position (d1).
2.3.2 Turn engine switch to “ON” (b2).
2.3.3 Open throttle by moving it slightly to left (c2).
2.3.4 Pull starter rope (e).
Note: If the oil level in the engine is low, the engine will not start. If this
happens, add oil to engine.
2.3.5 Open choke as engine warms (d1).
2.3.6 Open throttle fully to operate (c1).
2.4 To Stop
See Graphic: wc_gr000655
2.4.1 Reduce engine RPM to idle by moving throttle completely to right (c3).
2.4.2 Turn engine switch to “OFF” (b1).
2.4.3 Close fuel valve (a2).
a1
a2 b2
b1 c1 c2 c3
d2
wc_gr000655
e
d1

Maintenance WM 130 / 170 / 270
16 wc_tx000242gb.fm
3 Maintenance
3.1 Maintaining the Emission Control System
Normal 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
dealer/service center authorized by Wacker Neuson. The use of
service 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.
3.2 Periodic Maintenance Schedule
* Perform initially after first 20 hours of operation.
Maintenance, replacement or repair of emission control devices and systems may be performed by
any repair establishment or individual.
Daily
before
starting
After
first 20
hours
Every
2 weeks
or
50 hrs.
Every
month
or
100 hrs.
Every
year
or
300 hrs.
Every
500 hrs.
Check fuel level. 
Check engine oil level. 
Inspect fuel lines. 
Inspect air filter. Replace as
needed. 
Check external hardware. 
Clean air cleaner elements. 
Change engine oil. *
Clean sediment cup / fuel filter. 
Check and clean spark plug. 
Check and adjust valve clear-
ance. 
Replace spark plug. 

WM 130 / 170 / 270 Maintenance
wc_tx000242gb.fm 17
3.3 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.
Note: Refer to the Technical Data for the recommended spark plug
type and the electrode gap setting.
3.3.1 Remove spark plug and inspect it.
3.3.2 Replace plug if the insulator is cracked or chipped.
3.3.3 Clean spark plug electrodes with a wire brush.
3.3.4 Set the electrode gap (a).
3.3.5 Tighten spark plug securely.
NOTICE: A loose spark plug can become very hot and may cause
engine damage.
WARNING
wc_gr000028

Maintenance WM 130 / 170 / 270
18 wc_tx000242gb.fm
3.4 Engine Oil
See Graphic: wc_gr000087
3.4.1 Drain oil while engine is still warm.
Note: In the interests of environmental protection,place a plastic sheet
and a container under the machine to collect any liquid which drains
off. Dispose of this liquid in accordance with environmental protection
legislation.
3.4.2 Remove the oil drain plug (a).
3.4.3 Allow the oil to drain.
3.4.4 Install the drain plug.
3.4.5 Fill the engine crankcase through the oil filler opening (b), to the upper
mark on the dipstick (c). Do not thread in the dipstick to check the level.
See Technical Data for oil quantity and type.
3.4.6 When the crankcase is full, reinstall the dipstick.
WARNING
Most used oil contains small amounts of materials that can cause cancer and other
health problems if inhaled, ingested, or left in contact with skin for prolonged
periods of time.
fTake steps to avoid inhaling or ingesting used engine oil.
fWash skin thoroughly after exposure to used engine oil.
w c _ g r 0 0 0 0 8 7
=
>
?

WM 130 / 170 / 270 Maintenance
wc_tx000242gb.fm 19
3.5 Cleaning the Fuel Strainer
3.5.1 To remove water and dirt, close the fuel lever and remove the fuel
strainer.
3.5.2 Inspect the fuel strainer (a) for water and dirt.
3.5.3 After removing any dirt and water, wash the fuel cup with a
nonflammable solvent.
3.5.4 Reinstall securely to prevent leakage.
wc_gr001093
a

Maintenance WM 130 / 170 / 270
20 wc_tx000242gb.fm
3.6 Servicing the Air Cleaner
Do not use gasoline or other types of low-flash point solvents for
cleaning the air cleaner. A fire or explosion could result.
NOTICE: Do not 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, the 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.
3.6.1 Open the air cleaner cover (a). Remove the filter assembly by pulling
it straight up. Inspect both elements for holes or tears. Replace
damaged elements.
3.6.2 Wash the foam element (b) in a solution of mild detergent and warm
water. Rinse it thoroughly in clean water. Allow the element to dry
thoroughly.
3.6.3 Tap the paper element (c) lightly to remove excess dirt or blow
compressed air through the filter from the inside out. Replace the
paper element if it appears heavily soiled.
WARNING
wc_gr000656
a
b
c