BigDog C-142 User manual

602469_1009 1-1
GENERAL INFORMATION
This manual applies to the following BigDog™ Mowers:
BigDog™ Mowers C Series Mowers
To the new owner
The purpose of this manual is to assist owners and operators
in maintaining and operating the BigDog™ Mowers. Please
read it carefully; information and instructions furnished can help
you achieve years of dependable performance.
A separate Engine Owner’s Manual is included with your
owner’s packet which contains additional engine information
that will not be repeated in this manual. You are urged to read it
before attempting any operation or repair of the engine.
It is the owner’s responsibility to make certain that the oper-
ators and mechanics read and understand this manual and all
decals before operating this machine. It is also the owner’s
responsibility to make certain that the operators and mechanics
are qualified and physically able individuals, properly trained in
the operation of this equipment. All operator and mechanics
must become familiar with the safe operation of the equipment,
operator controls and safety signs.
Never let children or untrained people operate or service the
equipment. Local regulations may restrict the age of the opera-
tor.
IMPORTANT: For more detailed maintenance and adjust-
ment information refer to the proper parts manual for your
machine. Refer to the “Product Literature” section of this man-
ual for ordering information.
The owner/user can prevent and is responsible for accidents or
injuries occurring to themselves, other people or property.
Using this manual
General operation, adjustment and maintenance guidance is
outlined for both the experienced and novice BigDog™ Mowers
user. Operating conditions vary considerably and cannot all be
addressed individually. Through experience, however, operators
should find no difficulty in developing good operating skills
suitable to most conditions.
Directions used in this manual, for example RIGHT or LEFT,
refer to directions when seated on mower facing forward, unless
otherwise stated.
Photographs and illustrations used were current at the time of
printing, but subsequent production changes may cause your
machine to vary slightly in detail. BigDog™ Mowers reserves
the right to redesign and change the machine as deemed neces-
sary, without notification. If a change has been made to your
machine which is not reflected in this owner’s manual, or the
parts manual, see your BigDog™ Mowers dealer for current
information and parts.
Warranty registration
The Delivery and Warranty Registration form must be com-
pleted and signed to validate your warranty protection. As the
new equipment owner, you are expected to see that the form is
completed and forwarded to BigDog™ Mowers at time of deliv-
ery.
Be sure to register the mower plus each attachment that dis-
plays a model and serial identification number plate with Big-
Dog™ Mowers.
IMPORTANT: Any unauthorized modification, alteration,
or use of non-approved attachments voids the warranty and
releases BigDog™ Mowers from any liability arising from sub-
sequent use of this equipment.
Model and serial number
Mower model and serial numbers are found on the serial iden-
tification plate, located on the left side of the mower’s frame
(under the left steering control lever).
These numbers are required on the Warranty Registration
form. They will also assure you of the correct service parts when
replacement becomes necessary.
Parts and service
Use original BigDog™ Mowers replacement parts only.
These parts are available through your local BigDog™ Mowers
dealer. To obtain prompt, efficient service, always provide the
following information when ordering parts:
1. Correct part description.
2. Correct model number.
3. Correct serial number.
All warranty repair and service must be handled through an
authorized BigDog™ Mowers dealer. Arrangements should be
made through your local service center.

1-2 602469_1009
NOTICE OF REQUIREMENT OF SPARK ARRESTER MUFFLER
This equipment may create sparks that can start fires around dry vegetation. California Public Resources Code Sec-
tion 4442.6 provides that it is unlawful to use or operate an internal combustion engine on any forest-covered,
brush-covered, or grass-covered land unless the engine is equipped with a spark arrester maintained in effective
working order. A spark arrester is a device constructed of nonflammable materials specifically for the purpose of
removing and retaining carbon and other flammable particles over 0.0232 of an inch in size from the exhaust flow of
an internal combustion engine that uses hydrocarbon fuels or which is qualified and rated by the United States For-
est Service. Other states or federal areas may have similar laws. The Operator Should Contact Local Fire Agencies
For Laws or Regulations Relating to Fire Prevention Requirements. THIS EQUIPMENT DOES NOT HAVE A
SPARK ARRESTER AND YOU SHOULD CONTACT YOUR AUTHORIZED DEALER FOR THE PURCHASE OF A
SPARK ARRESTER.
Inspect spark arrester daily; replace every 500 hours or as needed.
The Engine Owner’s Manual provides information regarding the U.S. Environmental Protection Agency
(EPA) and the California Emission Control Regulation of emission systems, maintenance and warranty.
Keep Engine Owner’s Manual with your unit. Should the Engine Owner’s Manual become damaged or illegi-
ble, replace immediately. Replacements may be ordered per the information found in the Product Informa-
tion section of the owner’s manual.
The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects or other reproductive harm.
WARNING:

602469_1009 1-3
BigDog™ Mowers C SERIES
BigDog™ Mowers CONSUMER PRODUCT
TWO YEAR LIMITED WARRANTY
WHAT IS COVERED BY THIS WARRANTY
BigDog™ Mowers, makes the following warranty to the origi-
nal purchaser only:
a. BigDog™ Mowers Consumer Products used for normal
residential purposes* are warranted for two (2) years
from date of delivery on all materials and
workmanship.
If the Purchaser discovers within this warranty period
(two years from date of delivery) a defect in materials or
workmanship:
OHe must promptly notify BigDog™ Mowers, or an
authorized dealer, in writing of the defect. In no event
shall such notification be received by BigDog™
Mowers, or an authorized dealer later than 30 days
after expiration of warranty.
OWithin a reasonable time after such notification, Big-
Dog™ Mowers, will correct any defect in material or
workmanship on the BigDog™ Mowers, by repairing
or replacing part(s) with either new or used replace-
ment parts.
OSuch repair, including parts and labor shall be at the
expense of BigDog™ Mowers, and,
b. The engine warranty is covered by the engine
manufacturer, to the original owner only, and,
c. The battery is covered by a one (1) year limited
warranty to the original owner only.
* Normal residential purpose means use of product
on same lot as your home. Use at more than one
location is considered commercial use. There is no
warranty on any BigDog™ Mowers C series mower
that is used in a commercial or rental application.
WHO MUST PERFORM THE WARRANTY SERVICE
All warranty service will be performed by dealers authorized by
BigDog™ Mowers. Service calls and/or transportation
expense of the product to and from the authorized dealer, for
warranty work, will be paid by the owner of the product. For
warranty service contact an authorized dealer.
WHAT IS NOT COVERED BY THIS WARRANTY
BigDog™ Mowers, does not warranty:
OSome product, components or parts not manufactured
by BigDog™ Mowers
ORepairs made by unauthorized persons
ODamage caused by use of the BigDog™ Mowers for
purposes other than those for which it was designed
ODamages caused by disasters such as fire, flood,
wind, and lightening
ODamages caused by neglect, abuse, abnormal use,
improper or unreasonable use, accident, negligence,
misuse or foam filled/solid filled tires
ORepairs or replacement resulting from the use of
unauthorized parts, accessories or attachments
ORepairs or replacement as the result if any alterations
or modifications, in the determination of BigDog™
Mowers, which adversely affects the operation, per-
formance or durability of the equipment.
OA BigDog™ mower which has the serial number
removed or made illegible
ODepreciation or damage caused by normal wear, lack
of reasonable and proper maintenance, failure to fol-
low the product’s owner’s manual operating, mainte-
nance and adjustment instructions or other
operational instructions provided by BigDog™ Mow-
ers.
ONormal maintenance parts and service including, but
not limited to, filters, fuel, lubricants, tune-up parts,
belts, blades, blade sharpening, bearings, brake or
steering adjustments
ORepairs necessary due to improper fuel, contaminates
in the fuel system, or failure to properly prepare the
fuel system prior to any period of non-use over three
months
DISCLAIMER OF WARRANTY
The foregoing warranties are in lieu of all other warranties,
expressed or implied, including but not limited to the implied
warranties of merchantability and fitness for a particular pur-
pose. However, if the BigDog™ Mowers is purchased as a con-
sumer product, any implied warranty of merchantability or
fitness for a particular purpose is limited to the duration of this
limited warranty. Some states do not allow limitations on how
long an implied warranty lasts, so the above limitation may not
apply to you. This warranty gives you specific legal rights, and
you may also have other rights which vary from state to state.
LIMITATION OF REMEDIES
In no case shall BigDog™ Mowers, be liable for any special,
incidental, or consequential damages based upon breach of war-
ranty, breach of contract, negligence, strict liability in tort, or
any other legal theory.
Such damages include, but are not limited to:
OLoss of profits
OLoss of savings or revenue
OLoss of use of a BigDog™ mower or any associated
equipment
OCost of capital
OCost of any substitute equipment, facilities, ser-
vices or downtime
OThe claims of third parties including customers, and
injury to property
Some states do not allow the exclusion or limitation of inciden-
tal or consequential damages, so the above limitation or exclu-
sion may not apply to you.
TIME LIMIT
Any action for breach of warranty must be commenced within
30 days after expiration of warranty.
NO OTHER WARRANTIES
Unless modified in writing, signed by both parties, and
approved by the President of Excel Industries, Inc., this agree-

1-4 602469_1009
ment is understood to be the complete and exclusive agreement
between the parties, superseding all prior agreements, oral or
written, and all other communications between the parties relat-
ing to the subject matter of this agreement. No employee of
Excel Industries, Inc., or any other party is authorized to make
any warranty in addition to those made in this agreement.
ALLOCATION OF RISKS
This agreement allocates the risks of product failure between
BigDog™ Mowers and the purchaser. This allocation is recog-
nized by both parties and is reflected in the price of the goods.
OWNER'S RESPONSIBILITY
You must maintain your BigDog™ Mowers Product following
the maintenance procedures described in your owner's manual.
Such routine maintenance, whether performed by a dealer or by
you, is at your expense.
This machine like any other powered equipment is poten-
tially dangerous unless properly operated. Any operator
must be cautious and keep safety in mind at all times. Any oper-
ator, prior to using the BigDog™ Mowers, should thoroughly
familiarize himself with the owner's manual regarding operation
and safety of the machine, as well as all safety warnings on the
machine itself.
WARRANTY REGISTRATION
1. Dealers must register the unit on-line or by filling out
the Warranty registration form, provided in the owner’s
packet. If using the Warranty registration form it MUST
be completed and signed by the authorized dealer and
original purchaser.
2. For validation, the completed Warranty registration form
MUST be forwarded to BigDog™ Mowers, within ten
(10) days following date of purchase.
3. The date of purchase constitutes delivery.

602469_1009 2-1
SAFETY PRECAUTIONS
This safety alert symbol is used to call attention to a message
intended to provide a reasonable degree of PERSONAL
SAFETY for operators and other persons during the normal
operation and servicing of this equipment.
DANGER – denotes immediate hazards which WILL result
in severe personal injury or death.
WARNING – denotes a hazard or unsafe practice which
COULD result in severe personal injury or death.
This manual uses two other words to highlight information.
IMPORTANT calls attention to special mechanical information
and NOTE: emphasizes general information worthy of special
attention.
All operators and mechanics should read this manual, and be
instructed about safe operating and maintenance procedures. If
the operators or mechanics cannot read and understand English,
it is the owner’s responsibility to explain this material to them.
This machine meets or exceeds the B-71.1-2003
specifications of the American National Standards Institute,
in effect at the time of production. However, improper use or
maintenance by the operator or owner can result in injury.
To reduce the potential for injury, comply with these safety
instructions and always pay attention to the safety alert V
symbol, which means DANGER or WARNING - “personal
safety instructions.” Failure to comply with the instructions
may result in personal injury or death.
Incorrect usage of this machine may result in severe
injury. Personnel operating and maintaining it should be
trained in the proper use and should read the manuals
completely and thoroughly before attempting to set-up,
operate, adjust, or service this machine.
It is the owner’s responsibility to make certain that the
operators and mechanics read and understand this manual and
all decals before operating this machine. It is also the owner’s
responsibility to make certain that the operators and mechanics
are qualified and physically able individuals, properly trained in
the operation of this equipment. All operators and mechanics
must become familiar with the safe operation of the equipment,
operator controls and safety signs.
Never let children or untrained people operate or service the
equipment. Local regulations may restrict the age of the
operator.
The owner/user can prevent and is responsible accidents or
injuries occurring to themselves, other people or property.
The owner should also ensure that the operator/mechanic
know that they are responsible for their own safety as well as the
safety of other persons within the vicinity. Remember, the
operator is responsible for accidents or hazards occurring to
other people or their property.
Safety and Instruction Decals
VSpecific safety warning decals are located on the equipment near the immediate areas of potential hazards. These decals should
not be removed or obliterated. Replace them if they become non-readable.
The following illustrations show the various decals that are located on the machine. A brief explanation, for those requiring one, is
shown to help the operator understand the meanings of these decals.
• Read Owner’s Manual and Safety Warning Decals before
attempting to operate this machine.
Part Number 601837
DANGER:
Rotating blades, pulleys & belts!
• Keep shields and covers in place while machine is in operation
• Keep hands, feet and clothing away from rotating pulleys and
belts.
601837
Part Number 779306
• Do not smoke while refueling.
• Do not remove the fuel tank cap or fill with engine running or
while the engine is hot.
• Allow engine to cool before storing machine inside a building.
• Store away from open flame or spark if there is fuel in tank.
• Clean up any gasoline spills.
• Do not refuel while in enclosed trailer or other enclosed areas.

2-2 602469_1009
WARNING: Thrown
objects!
• Never operate the mower deck
with side deflector damaged,
altered, removed or in raised posi-
tion, except when the entire grass
catcher attachment or mulching
system is being used.
Part Number
600899
• If you loose steering control while operating the machine,
place the steering control levers in the park brake position
immediately. Inspect the machine and involve your BigDog™
Mowers dealer to resolve the problem before continuing to
operate.
• If pump belt fails, steering control will be lost. Refer to owner’s
manual for inspection and replacement intervals and refer to
above paragraph for emergency procedures.
Part Number 601892
WARNING:
Thrown objects!
• Always maintain a safe distance from peo-
ple and pets when mowing.
• Always stop machine if someone enters the
area.
• Inspect area to be mowed for hazards such
as rocks, metal objects and other debris
which may be thrown or entangled by
mower blades. Remove these objects
before mowing.
If you lose steering control while operating the machine, place the steering
control levers in the park brake position immediately. Inspect the machine and
involve your dealer to resolve the problem before continuing to operate.
If pump belt fails, steering control will be lost. Refer to owner’s manual for
inspection and replacement intervals and refer to above paragraph for
emergency procedures.
600899
WARNING:
Fire!
• Clean flammable material from
machine. Prevent fires by keeping
engine compartment, top of deck,
exhaust area, battery, fuel line, fuel
tank and operator’s station clean of
accumulated trash, grass clippings,
and other debris. Always clean up
spilled fuel and oil.
WARNING:
Hot Surface!
• Keep safe distance from machine.
601967
602041
Part Number
602041
Part Number
601967

602469_1009 2-3
Part Number 601981
WARNING: Read Owner’s Manual and decals before
attempting to operate this machine.
WARNING: Roll over!
• Mow a safe distance (minimum of 10 feet) away
from drop-offs, retaining walls, drainage ditches,
embankments, water, and other types of hazards to
avoid a wheel dropping over the edge or to avoid
the ground from breaking away.
WARNING: Back over!
• Do not carry passengers
• Always stop machine if someone enters the area.
• Always be aware of what is behind the machine
before backing up. Do not mow in reverse unless
absolutely necessary. Always look down and
behind before and while backing up.
WARNING: Roll over!
• Slow down before turning.
• Do not operate on slopes greater than 15 degrees.
• Keep all movement on slopes slow and gradual.
Never make sudden changes in speed and direc-
tion.
• Do not mow on slopes above a retaining wall or
drop-off.
WARNING: Ejection!
• Do not operate on slopes greater than 15 degrees.
• Keep all movement on slow and gradual when
going up or down slopes.
• Do not remove or modify stabilizer wheels or injury
can result.
WARNING: Loss of traction/control on slopes!
• Shut off blades.
• Back slowly down the slope when loss of traction
occurs.

2-4 602469_1009
601811
B
I
J
K
A
DF
Part Number 601811
• Do not overfill battery.
• Electrolyte may overflow and
damage paint, wiring or struc-
ture. When cleaning the battery,
use soap and water into the bat-
tery. Be careful not to get soap
and water into the battery. Use
soda mixed in water to clean cor-
rosion off the terminals.
• Always wear eye protection
when checking the battery, acid
can cause serious injury to skin
and eyes. If contact occurs,
flush area with clean water and
call physician immediately. Acid
will also damage clothing.
DANGER: Battery Hazards!
• Avoid skin contact
with battery acid.
• Do not allow open flame near the
battery when charging.
• Hydrogen gas forms inside the bat-
tery. This gas is both toxic and
flammable and may cause an
explosion if exposed to flame.
Always remove the negative ground
first and replace it last.
Part Number 601815
601815
A. Fast
B. Slow
C. Choke
D. Mower blade engage/disengage switch
E. Ignition switch - insert key
F. OFF
G. ON
H. Engine start position
I. Wear ear protection, eye protection and safety shoes when
operating this equipment.
J. Read Operator’s Manual before attempting to operate this
machine. Read Operator’s Manual before attempting to service
this machine.
K. Before starting the engine:
• Read Owner’s Manual
• Disengage mower blades
• Place control levers in park brake position
E
B
G
H
C

602469_1009 2-5
Hours Recorded
Engine Water
Temperature
Increase
Decrease
Fuel Level
High Range
Low Range
Auto AWD
Full Time AWD
Engine Oil
Pressure
Air Filter
Continuously
Variable
Neutral
Diesel Fuel
Lock
Release Lock
Differential Lock
Volume Empty
Engine Start
Engine Oil
Engine Stop
Glow
Parking Brake
Battery
Power Take-off
(ON)
Attachment
(Lowered)
Remote Cylinder
(Retracted)
Remote Cylinder
(Extended)
Volume Full
Control Lever
Hold
Fast
Slow
Power Take-off
(OFF)
Attachment
(Raised)
INTERNATIONAL SYMBOLS
As a guide to the operation of your mower, various international symbols have been used on instruments and controls.
These symbols are depicted and described below.

2-6 602469_1009

602469_1009 2-7
SLOPE GUIDE
Use this diagram when determining the degree of slope to be mowed.
1. Hold this sheet of paper in front of you. Make sure that Line A is horizontal.
2. Align Line B with a vertical surface such as pole, tree or building.
3. Fold the paper along the slope guide lines (C, D or E).
4. Align the closest slope guide line with the ground slope. This will give you a close estimation of the ground slope.
E (15o)
D (10o)
C (5o)
Line B
Line A
Slope Guide Lines

602469_1009 2-8

602469_1009 3-1
OPERATION
Safe Operating Practices
This product is capable of amputating hands and feet and
throwing objects. Always follow all safety instructions to avoid
serious injury or death.
Operation
VEvaluate the terrain to determine what accessories and
attachments are needed to properly and safely perform
the job. Only use accessories and attachments approved
by the manufacturer.
VNever leave a running machine unattended. Always stop
on level ground, disengage deck clutch, place steering
control levers in park brake position, stop the engine, and
remove ignition key before leaving operator’s seat for
any reason including emptying the catcher or unclogging
the chute.
VDo not change the engine governor setting or overspeed
the engine.
VAlways remain seated while operating machine.
VAlways keep safety shields and covers in place.
VAlways maintain a safe distance from people and pets
when mowing. Always stop machine if someone enters
the area.
VAlways operate machine in daylight or with adequate
working lights.
VFollow daily and weekly checklists, making sure hoses
are tightly secured and bolts are tightened.
VAlways observe traffic laws while driving machine from
one location to another. Watch for traffic when operating
near or crossing roadways.
VAlways be alert for hazards such as rocks, metal objects
and other debris which may be thrown or entangled by
mower blades. Watch out for holes or deep depressions.
VInspect area to be mowed for hazards such as rocks,
metal objects and other debris which may be thrown or
entangled by mower blades. Remove these objects before
mowing.
VAlways inspect machine for damage after striking a for-
eign object. If damage is found, repair machine immedi-
ately. Be sure to stop on level ground, disengage deck
clutch, place steering control levers in park brake posi-
tion, stop the engine, and remove ignition key when leav-
ing operator’s seat to inspect damage.
VAlways wear adequate ear protection, such as earplugs,
when operating this equipment as prolonged exposure to
uncomfortable or loud noises can cause impairment or
loss of hearing. Do not wear radios or music headphones
while operating the machinery. Safe operation requires
your full attention.
VDo not operate the equipment while wearing sandals, ten-
nis shoes, sneakers, shorts or any type of loose fitting
clothing. Long hair, loose clothing or jewelry may get
tangled in moving parts. Always wear long pants, safety
glasses, ear protection and safety shoes when operating
this machine.
VAlways be aware of what is behind the machine before
backing up. Do not mow in reverse unless absolutely nec-
essary. Always look down and behind before and while
backing up.
VNever push forward suddenly on your steering control
levers while the machine is in rearward motion because
machine may tip backwards.
VNever pull back suddenly on your steering control levers
while the machine is in forward motion.
VWhen moving in reverse, push forward slowly on steer-
ing control levers and avoid sudden movement. Rapid
movement of the steering control levers in either direc-
tion could result in a reaction of the machine that can
cause serious injury.
VNever operate a poorly maintained machine.
VNever attempt high speed maneuvering, especially in
crowded, congested areas or on slopes.
VNever allow persons to operate this machine without
proper instruction or allow children to operate machine.
Allow only responsible adults who have read and under-
stand these instructions to operate this machine.
VNever put hands or feet under any part of the machine
while it is running.
VNever carry passengers.
VNever direct discharged material toward anyone. Avoid
discharging material against a wall or obstruction. Mate-
rial may ricochet back toward the operator. Always dis-
engage the blades and wait for them to stop before
crossing gravel drives, walks or roads.
VAlways keep clear of the mower blades and attachments
during their operation.
VTurn off blades when not mowing.
VSlow down before turning.
VStop the engine before removing the grass catcher or
unclogging the discharge chute. Never clear the discharge
chute with the engine running. Turn off the engine and be
sure the blades have stopped before cleaning. Use a stick
to clear a plugged discharge area. Never use your hand!
VDo not operate the machine while under the influence of
alcohol or drugs.
VExercise caution when loading or unloading the machine
onto a trailer or truck.
VAlways wear safety goggles or safety glasses with side
shields when operating the mower.
VData indicates that operators, age 60 years and above, are
involved in a large percentage of riding mower-related
injuries. These operators should evaluate their ability to
operate the mower safely enough to protect themselves
and others from serious injury.
VFollow the manufacturer’s recommendation for wheel
weights or counterweights.
VIf any attachment or additional weight is mounted on the
rear of the unit, any rapid movement of the steering con-
trol levers in either direction could result in a reaction of
the machine that can cause serious injury.
VClean flammable material from machine. Prevent
fires by keeping engine compartment, exhaust area,

3-2 602469_1009
battery, fuel line, fuel tank and operator’s station
clean of accumulated trash, grass clippings, and other
debris. Always clean up spilled fuel and oil.
Using a ramp
VUse extreme caution when loading and unloading a unit
onto a truck or trailer with a ramp.
VUse only a single, full width ramp; do not use individual
ramps for each side of the unit. Having a full width ramp
provides a surface for the mower frame to contact if the
unit starts to tip backwards. It also reduces the risk of a
wheel going off and the machine tipping over.
VDo not exceed a 15 degree angle between the ramp and
the ground or between the ramp and the trailer or truck.
VWhen on a ramp avoid sudden acceleration
Slope operation
Slopes are a major factor in loss-of-control and tip-over
accidents, which can result in severe injury or death. All
slopes require extra caution. If you cannot back up the slope
or if you feel uneasy on it; do not mow it. REMINDER: Only
operate on slopes of 15 degrees or less.
VUse extreme caution when operating on slopes.
• Be extremely careful changing directions on a slope.
Slow down.
• Do not operate where the machine could slip or tip.
• Turn slowly
• Turn on the most level part of the slope
• To maximize traction, it is better to turn the front of the
machine uphill, rather than downhill. If drive tires lose
traction, steering control is lost which could cause
serious injury or death.
• If it becomes necessary to turn downhill, turn slowly
and gradually.
VDo not remove or modify the stabilizer wheels.
VWatch for holes, ruts, bumps, rocks or other hidden
objects. Uneven terrain could overturn the machine. Tall
grass can hide obstacles.
VRemove obstacles such as rocks, tree limbs, etc.
VKeep all movement on slopes slow and gradual. Do not
make sudden changes in speed or direction.
VAvoid starting and stopping on a slope. If tires lose trac-
tion, disengage the blades and proceed slowly straight
down the slope.
VMow a safe distance (minimum of 10 feet) away from
drop-offs, retaining walls, drainage ditches, embank-
ments, water, and other types of hazards to avoid a wheel
dropping over the edge or to avoid the ground from
breaking away. This will reduce the risk of the machine
suddenly rolling over causing serious injury or death.
VUse a walk behind, push mower or hand-held trimmer on
slopes and near drop-offs, retaining walls, drainage
ditches, embankments and water to avoid machine roll-
over and serious injury or death.
VDo not mow on wet grass. Reduced traction could cause
sliding and loss of steering control.
VDo not tow on slopes. The weight of the towed equip-
ment may cause loss of traction and control.
VDo not try to stabilize the machine by putting your foot
on the ground.
VIf the mower’s tires lose traction when operating on
slopes, disengage the blades, place the steering control
levers in the park brake position, turn the engine off and
get help.
VNever make sudden starts, stops, turns, or reverse direc-
tion, especially when maneuvering on slopes. The steer-
ing is designed for sensitive response. Rapid movement
of the steering control levers in either direction could
result in a reaction of the machine that can cause serious
injury.
VNever stop suddenly while backing down slopes. This
action may result in a reaction of the machine that can
cause serious physical injury.
VThe BigDog™ mower is capable of operating horizon-
tally (traverse) on moderate slopes. When operating on
slopes up to 15 degrees, be aware of any conditions that
may cause the mower drive tires to lose traction resulting
in a possible loss of control of the machine. An operator
should not operate on a slope until he is thoroughly
familiar with the equipment.
Do not operate on slopes greater than 15 degrees.
Refer to Slope Guide, page 2-5, when determining the
degree of slope to be mowed.
It is strongly recommended that the operator drive the
machine off of the slope, using extreme caution, if any
sign of loss of traction is detected. Wait until the condi-
tion that caused the problem is resolved before attempt-
ing to operate on the slope again.
Terrain conditions can affect traction resulting in pos-
sible loss of control of the machine. Some of the condi-
tions to be aware of are:
1. Wet terrain
2. Depressions in the ground; i.e. holes, ruts, washouts
3. Mounds of dirt
4. Soil type; i.e. sand, loose dirt, gravel, clay
5. Grass type, density, and height
6. Extremely dry conditions of grass
7. Tire pressure
The attachments mounted to the mower will also
affect the way it handles on a slope. Be aware that each
attachment’s characteristics vary.
Another consideration is to always Mow a safe dis-
tance (minimum of 10 feet) away from drop-offs, retain-
ing walls, drainage ditches, embankments, water, and
other types of hazards to avoid a wheel dropping over the
edge or to avoid the ground from breaking away and
always be aware of what is located at the bottom of the
slope. This will reduce the risk of the machine suddenly
rolling over causing serious injury or death.
Extreme caution should be used when there is a haz-
ard located at the bottom of the slope. Some examples
are:
1. Water; i.e. lake, river
2. Cliffs, retaining walls
3. Roads, highways
4. Buildings
5. Rocks
These are just a few examples of situations when cau-
tion must be used when operating on a slope. There are
many other possibilities too numerous to mention. Just

602469_1009 3-3
remember to always exercise extreme caution when oper-
ating on any slope.
Children
Tragic accidents can occur if the operator is not alert to
the presence of children. Children are often attracted to the
machine and the mowing activity. Never assume that
children will remain where you last saw them.
VNever leave machine unattended with ignition key in
switch, especially with children present.
VChildren or bystanders may be injured if they move or
attempt to operate the machine while it is unattended.
Always disengage deck clutch, place steering control
levers in park brake position, stop the engine, and remove
ignition key when leaving operator’s seat.
VKeep children out of the mowing area and under the
watchful care of a responsible adult other than the opera-
tor.
VBe alert and turn the machine off if children enter the
area.
VBefore and while backing, look behind and down for
small children.
VNever carry children, even with the blades off. They may
fall off and be seriously injured or interfere with safe
machine operation. Children who have been given rides
in the past may suddenly appear in the mowing area for
another ride and be run over or backed over by the
machine.
VNever allow children to operate the machine.
VUse care when approaching blind corners, shrubs, trees,
the end of a fence or other objects that may obscure
vision.
VNever allow children or others in or on towed equipment.
Control Panel
A. Choke/Throttle control (Fig. 3-1) — a cable is linked to
engine throttle for controlling engine speed. Move lever
forward to increase engine rpm, move lever rearward to
decrease engine rpm.
To reach the choke position, push forward on the lever as
far as it will go. As the lever is pushed forward you will
notice a detente position (full throttle), when the lever is
moved past this point, the choke is engaged. Do not
operate the machine in the choke position.
B. Deck clutch switch (Fig. 3-1) — this switch engages the
deck. Pull the switch up to engage and push switch down
to disengage the clutch.
IMPORTANT: Never engage clutch with engine running
at high rpm or when the deck is under load. Clutch, belts
or deck could be damaged.
C. Ignition switch (Fig. 3-1) — a three position switch: off,
run, and start. With key inserted, rotate it clockwise to
START position; release key when engine starts, and
switch will automatically return to the RUN position
Controls
A. Steering control levers (Fig. 3-2 & Fig. 3-3) — these
levers control the mower’s speed, direction, stopping,
neutral lock, and park brake. Levers are used to steer,
accelerate, decelerate, stop and change direction. When
the control levers are in the park brake position (Fig. 3-3)
the mower will not move when the engine is on and drive
pumps are operating.
WARNING: The parking brake may not hold the
machine if parked on a slope. Block or chock the
machine when parked on a slope
B. Deck lift pedal (Fig. 3-4) — the deck lift pedal is used to
raise or lower the deck. Push on the pedal to raise the
deck and then place the deck height locking pin into the
desired cutting height hole.
Push the deck lift pedal to raise the deck when going over
obstructions.
A. Choke/Throttle
B. Deck clutch switch
C. Ignition switch
Fig. 3-1
A
C
B
Fig. 3-2
Shown with steering control
levers in neutral position
Steering control lever

3-4 602469_1009
Safety start interlock system
The machine is equipped with a safety start interlock system
consisting of the park brake switches, seat switch, and deck
clutch switch.
Check mower safety start interlock system daily, prior to
operation. This system is an important mower safety feature. It
should be repaired immediately if it malfunctions. The machine
incorporates a separate seat switch which will stop the engine
when the operator is unseated for any reason while the mower is
operating. This is a safety feature designed to prevent runaway
or accidental entanglement. To inspect the system:
1. The operator must be on the seat when testing the seat
switch.
2. Set both steering control levers in the park brake position.
3. Start the engine and allow it to warm up to operating
temperature.
4. With the deck clutch switch down and the steering
control levers in the park brake position, slowly raise off
of the seat. The engine should continue to run.
5. With the deck clutch switch up and/or the steering control
levers in the neutral, slowly raise off of the seat. The
engine should stop.
6. If the engine fails to stop when the deck clutch switch is
up or one or both of the steering control levers are in
neutral and the operator is off the seat, check the function
of the seat switch. If the seat switch is not operating
properly (is not opening or closing) and if the cause can
not be determined, replace the seat switch.
If the problem can not be located, contact your BigDog™
Mowers Dealer.
WARNING: The safety interlock system should
always function per steps 4 and 5. If it does not func-
tion properly, it should be corrected immediately. Do
not operate machine without properly functioning seat
safety switch.
Engine starting
The mower’s safety start interlock system is also designed to
protect the operator and others from accidental injury due to
unintentional engine starting. The engine starting motor will not
engage until:
A. Steering control levers are in the park brake position.
B. Deck clutch switch is in the down (OFF) position.
WARNING: The safety interlock system must not be
disconnected or bypassed. Doing so could cause the
machine to operate unexpectedly resulting in personal
injury.
NOTE: The operator’s seat is equipped with a separate
safety switch. If for any reason the operator should become
unseated when the steering control levers are not in the park
brake position (park brake switches are disengaged) or the deck
clutch switch is engaged the engine will stop.
The following steps are the correct procedures for starting the
engine. If difficulty is encountered, contact the BigDog™
Mowers Dealer in your area.
1. Before starting the mower each day, perform daily pre-
operation checking. (See “Safety start interlock system”
on page 3-4.)
2. Make sure the steering control levers are in the park
brake position and deck clutch switch is disengaged.
Only start the engine from the operator’s position.
3. Use choke (choke/throttle control lever in full forward
position) when engine is cold, or if warm engine fails to
start within 5 seconds of cranking. Avoid flooding and
operate engine without choking as soon as possible.
4. Set throttle at approximately 1/2 open position.
5. Insert key in ignition switch and rotate full clockwise to
engage starting motor. Release key when engine starts.
IMPORTANT: The engine starter should not be operated
for periods longer than 30 seconds at a time. An interval of at
least two minutes should be allowed between such cranking
periods to protect the starter from overheating and burn-out.
6. Perform test to make sure safety start interlock system is
operating properly. Refer to Safety start interlock system
section.
7. Allow the engine to idle a few minutes before advancing
the throttle and/or engaging the deck clutch.
8. Before stopping the engine, place the steering control
levers in the park brake position, disengage the deck
Fig. 3-3
Fig. 3-4
Steering control levers in
park brake position
Deck lift pedal

602469_1009 3-5
clutch, and throttle back to low idle for a couple of
minutes; then rotate ignition key counter-clockwise to the
OFF position. Remove the key from switch before
leaving the machine.
Stopping the engine
Use the following procedure to shut off the engine after
operating the equipment.
1. Place the steering control levers in the park brake
position
2. Disengage the deck clutch
3. Throttle back to low idle for a couple of minutes
4. Rotate ignition key counter-clockwise to the OFF
position. Remove the key from switch before leaving the
machine.
Moving mower with stalled engine
WARNING: Allow engine exhaust manifold to cool
before engaging or disengaging the bypass valves. The
bypass valve rods are located close to the exhaust sys-
tem.
If it becomes necessary to move the machine when the engine
is inoperative, the transaxles are equipped with bypass valves.
Before moving the unit, pull out on the bypass valve rods and
slide them into the slot to lock in position. Both bypass valve
rods are located underneath the rear of the mower at the back of
the transaxle. (Fig. 3-5 & Fig. 3-6)
The steering control levers must be placed in the neutral
position, to release the park brakes, so that the mower can be
moved.
Do not tow the machine. Move it by hand or use a winch to
load on a trailer for transporting.
When transporting on another vehicle, the mower must be
secured.
IMPORTANT: Always make certain the two bypass valves
are returned to their operating position before running the
mower following repairs.
Driving the mower
DANGER: Never make sudden stops or reverse
direction, especially when maneuvering on a slope.
The steering is designed for sensitive response. Rapid
movement of the steering control levers in either
direction could result in a reaction of the machine that
can cause serious injury.
After starting engine, engage the steering control levers and
steer as follows:
To go forward, push steering control levers forward an equal
distance (Fig. 3-7).
To go in reverse, pull steering control levers rearward an
equal distance (Fig. 3-7).
To turn left, move the right steering control lever farther
forward from neutral than the left steering control lever.
(Fig. 3-7)
To turn right, move the left steering control lever farther
forward from neutral than the right steering control lever.
(Fig. 3-7)
Zero radius turn, move one steering control lever forward
and the other steering control lever back of neutral. This will
allow the drive wheels to counter-rotate. (Fig. 3-7)
To stop or decrease speed, move steering control levers to
neutral. When going forward pull back gently on steering
control levers. When going in reverse push forward gently on
steering control levers.
For emergency stop, when traveling forward or rearward,
Fig. 3-5
Slot
Bypass valve rod
(Right rod shown in
operating position)
(Viewed from the rear right underneath side)
Fig. 3-6
Bypass valve rod
(Right rod shown in
disengaged position)
(Viewed from the rear right underneath side)

3-6 602469_1009
place the steering control levers in the park brake position
immediately.
DANGER: When moving in the rearward direction
push forward gently on steering control levers and
avoid sudden movement. Any sudden movement
could cause the front of the mower to come off of the
ground resulting in possible loss of control causing
serious injury or death.
To make a three point turn to the right, move the left
steering control lever farther forward from neutral than the right
steering control lever and start the turn. Next, pull back on the
steering control levers until they are past neutral and the
machine starts to go rearward. Pull right steering control lever
farther rearward from neutral than the left steering control lever
until the rear of the machine has pivoted around. Then, push the
steering control levers forward until they are both past neutral
and the machine starts to go forward. Push the left steering
control lever farther forward from neutral than the right steering
control lever and finish the turn. (Fig. 3-8)
WARNING: Always be aware of what is behind the
machine before backing up. Do not mow in reverse
unless absolutely necessary. Always look down and
behind before and while backing up.
IMPORTANT: Rapid movement of steering control levers
is not recommended as damage to the hydraulic system compo-
nents may occur.
To increase speed, increase steering control lever’s distance
from neutral. The farther forward steering control levers are
from neutral, the faster the machine will travel forward. The
farther back steering control levers are from neutral, the faster
the machine will go in reverse.
Operating suggestions
DANGER: Prior to operating the mower the operator
should be thoroughly familiar with the proper use and
operation of the equipment, should read the manual
completely and thoroughly, and should have attempted
slow moving maneuvers to become familiar with the
operation of the equipment before attempting normal
speed operation. An inexperienced operator should not
mow on slopes or on uneven terrain.
WARNING: If you lose steering control while operat-
ing the machine, place the steering control levers in
the park brake position immediately. Inspect the
machine and involve your BigDog™ Mowers dealer
to resolve the problem before continuing to operate.
WARNING: The unit’s steering control levers are
very responsive: Easy does it! For smooth operation,
move lever slowly, avoid sudden movement. Skill and
ease of operation come with practice and experience.
The machine can spin very rapidly. Use caution when
making turns and slow down before making sharp
turns.
Inexperienced operators may have a tendency to oversteer and
lose control. Slow-moving practice maneuvers are
recommended to become familiar with these characteristics
before attempting normal speed operation.
WARNING: Sharp depressions or raised obstacles
(such as gutters or curbs) should not be directly
approached at high speed in an attempt to “jump”
them as the operator could be thrown from the equip-
ment. Approach at a slow speed and angle one drive
wheel at the obstruction. Continue at an angle until the
wheel clears and then pivot the opposite wheel around.
When turning on soft wet turf, keep both wheels rolling either
forward or backward. Pivoting on one stopped wheel can
FRONT OF MOWER FACES THIS DIRECTION
Fig. 3-7
NN
FORWARD TRAVEL ZERO RADIUS
TURN
FORWARD TRAVEL
RIGHT TURN
REVERSE TRAVEL
RIGHT TURN
REVERSE TRAVEL
N = NEUTRAL POSITION
Direction of arrows indicate direction of mower movement

602469_1009 3-7
damage turf. This is especially important when mowing.
Mower performance is maximum when the throttle is set at
full rpm. This gives maximum power to the drive wheels and
deck when needed. Use the control levers to control ground
speed rather than engine rpm.
Keep blades sharp. Many professional mowing companies
have additional sets of blades and change blades twice a day:
once in the morning and again at noon. Many problems with
incorrect cutting patterns are due to dull blades or blades
which have been sharpened incorrectly. Information on
sharpening blades is listed in this manual’s maintenance section.
In addition, most communities have individuals or companies
which specialize in sharpening mower blades. Blade sharpness
should be checked daily.
DANGER: Never work with blades while engine is
running or deck clutch switch is engaged (on). Always
place deck clutch switch in the disengaged position,
place steering control levers in the park brake position
and turn engine off and disconnect negative battery
cable. Block up mower when you must work under it.
Wear gloves when handling blades. Always check for
blade damage if mower strikes a rock, a branch or
another foreign object during mowing!
Use high blade speed. Your mower is designed to operate at
full throttle. The throttle setting directly controls blade speed.
The highest blade speed generally gives best cut.
Direct grass discharge to right, away from unmown area.
Select a mowing pattern that directs grass discharge towards the
outside, not towards center, of mowing area. Generally, this
means using a pattern utilizing left turns because side discharge
is to right. In any case, avoid throwing grass discharge onto
unmowed area because grass is then mowed “twice”. Mowing
twice puts an unnecessary load on the unit and reduces mowing
efficiency.
When mowing a lawn for the first time cut grass slightly
longer than normal to avoid scalping uneven terrain. When
possible, it is best to use the cutting height that was used in the
past. When cutting grass taller than six inches, you may want to
mow the lawn twice to achieve a better quality of cut.
During normal mowing cut only about 1/3 of the grass
blade. Cutting more than that is not recommended unless grass
is sparse or it is the end of the mowing season.
Alternate mowing direction to keep the grass growing
straight and better dispersion of the clippings.
Remember, grass grows at different rates at different time
of the year. Mow more often in the early spring to maintain the
same cutting height. As the growth rate slows in mid summer,
mow less frequently. If you cannot mow at a regular interval,
mow at a high cutting height; then mow again two days later at a
lower cutting height.
Raise the cutting height of the mower if the cutting width of
the mower is wider than the previous mower. This ensures that
uneven turf is not cut too short.
Raise the cutting height of the mower if the grass if slightly
taller than normal or if it contains a high degree of moisture.
Then mow it again with the cutting height set lower.
If the machine’s forward motion must be stopped while
mowing, a clump of grass clippings may drop onto your lawn.
Fig. 3-8
Step 1
Three point turn
Step 2
Step 3
Right
control
lever
Left
control
lever
Neutral
Right
control
lever
Left
control
lever
Neutral
Neutral
Left control leverRight control lever