M10, M21, and M23
21–Inch Walk-Behind Mowers
®
TECHNICAL MANUAL
John Deere
Worldwide Commercial And
Consumer Products Divison
TM1722 (Feb 98)
Litho in U.S.A.
This technical manual is written for an experienced
technician and contains sections that are specifically for
this product. It is a part of a total product support
program.
INTRODUCTION
Safety
The manual is organized so that all the information on a
particular system is kept together. The order of grouping
is as follows:
• Table of Contents
• General Diagnostic Information
• Specifications
• Electrical Wiring Harness Legend
• Component Location
• System Schematic
• Wiring Harness
• Troubleshooting Chart
• Theory of Operation
• Diagnostics
• Tests & Adjustments
• Repair
Note: Depending on the particular section or system
being covered, not all of the abov e g roups ma y be
used.
Each section will be identified with a symbol rather than a
number. The groups and pages within a section will be
consecutively numbered.
Specifications and
Information
Engine
Power Train
Miscellaneous
We appreciate your input on this manual. To help, there
are postage paid post cards included at the back. If you
find any errors or want to comment on the layout of the
manual please fill out one of the cards and mail it back to
us.
All information, illustrations and
specifications in this manual are based on
the latest information available at the time of
publication. The right is reserved to make
changes at any time without notice.
COPYRIGHT
Deere and Co.
John Deere Worldwide Commercial and
Consumer Equipment Division
Horicon, WI
All rights reserved
©
1998
2/11/98
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SAFETY
Recognize Safety Information
This is the safety-alert symbol. When you see this
symbol on your machine or in this manual, be alert to
the potential for personal injury.
Follow recommended precautions and safe servicing
practices.
Understand Signal Words
A signal word—DANGER, WARNING, or CAUTION—
is used with the safety-alert symbol. DANGER
identifies the most serious hazards.
DANGER or WARNING safety signs are located near
specific hazards. General precautions are listed on
CAUTION safety signs. CAUTION also calls attention
to safety messages in this manual.
Replace Safety Signs
Handle Fluids Safely-Avoid Fires
Be Prepared For Emergencies
When you work around fuel, do not smoke or work near
heaters or other fire hazards.
Store flammable fluids away from fire hazards. Do not
incinerate or puncture pressurized containers.
Make sure machine is clean of trash, grease, and
debris.
Do not store oily rags; they can ignite and burn
spontaneously.
Be prepared if a fire starts.
Keep a first aid kit and fire extinguisher handy.
Keep emergency numbers for doctors, ambulance
service, hospital, and fire department near your
telephone.
Replace missing or damaged safety signs. See the
machine operator’s manual for correct safety sign
placement.
W ARNING: California Pr oposition 65
Warning
Gasoline engine exhaust from this product contains
chemicals known to the State of California to cause
cancer, birth defects, or other reproductive harm.
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Wear Protective Clothing
Wear close fitting clothing and safety equipment
appropriate to the job.
Prolonged exposure to loud noise can cause
impairment or loss of hearing. Wear a suitable hearing
protective device such as earmuffs or earplugs to
protect against objectionable or uncomfortable loud
noises.
2/11/98
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