Textron Jacobsen 744908A User manual

WARNING: If incorrectly used this machine can cause severe injury. Those who use
and maintain this machine should be trained in its proper use, warned of its dangers
and should read the entire manual before attempting to set up, operate, adjust or
service the machine.
TECHNICAL MANUAL
Safety, Operation, Parts, Maintenance, Service
4124517 REV A
Models:
744908A LAWNAIRE IV 4HP HONDA
744909A LAWNAIRE IV 3.5HP BRIGGS & STRATTON
744910A LAWNAIRE V 4HP HONDA
744911A LAWNAIRE V 3.5HP BRIGGS & STRATTON

CALIFORNIA
Proposition 65 Warning
Diesel engine exhaust and some of
its constituents are known to the State
of California to cause cancer, birth
defects and other reproductive harm.
Californie Proposition 65
Avertissement
Les échappements des moteurs diesel
et certains de leurs composés sont
reconnus par l’Etat de Californie pour
être cancérigènes, provoquer des
défauts congénitaux et d’autres dangers
en matière de reproduction.
ADVERTENCIA
AVERTISSEMENT
WARNING
The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects or other reproductive harm.
California Advertencia
de la Proposicion 65
El estado de California hace saber que
los gases de escape de los motores
diesel y algunos de sus componentes
producen cáncer, defectos de
nacimiento y otros daños en el
proceso de reproducción humana.
L’ é mission du moteur de ce mat é riel
contient des produits chimiques que
l’Etat de Californie consid è re ê tre
canc é rig è nes, provoquer des d é fauts
cong é nitaux et d’autres dangers en
mati è re de reproduction.
El estado de California hace saber
que los gases de escape de este
producto contienen productos
quÍmicos que producen cáncer,
defectos de nacimiento y otros daños
en el proceso de reproducción
humana.
© 2002, TEXTRON INC

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Lawnaire
IV & V
12-2002-TGTSP
IMPORTANT MESSAGE
Thank you for purchasing this Jacobsen product. You have purchased a world class product, one of the best
designed and built anywhere.
This machine comes with a Technical Manual containing safety, operation, parts, maintenance and service
information. The useful life and good service you receive from this machine depends to a large extent on how
well you read and understand this manual. Treat your machine properly, lubricate and adjust it as instructed,
and it will give you many years of reliable service.
Your safe use of this Jacobsen product is one of our prime design objectives. Many safety features are built in,
but we also rely on your good sense and care to achieve accident-free operation. For best protection, study the
manual thoroughly. Learn the proper operation of all controls. Observe all safety precautions. Follow all
instructions and warnings completely. Do not remove or defeat any safety features. Make sure those who
operate this machine are as well informed and careful in its use as you are.
See a Jacobsen dealer for any service or parts needed. Jacobsen service ensures that you continue to receive
the best results possible from Jacobsen’s products. You can trust Jacobsen replacement parts because they
are manufactured with the same high precision and quality as the original parts.
Jacobsen designs and builds its equipment to serve many years in a safe and productive manner. For longest
life, use this machine only as directed in the manual, keep it in good repair and follow safety warnings and
instructions. You'll always be glad you did.
Textron Golf, Turf & Specialty Products
One Bob Cat Lane
Johnson Creek, WI 53038-0469
TABLE OF CONTENTS FIGURES PAGE
SAFETY ......................................................................................................................................................... 2
SAFETY AND OPERATION DECALS ............................................................................................................ 3
ASSEMBLY/SET-UP INSTRUCTIONS ...................................................................................................... 4, 5
CONTROLS ............................................................................................................................................... 7, 8
OPERATION ............................................................................................................................................ 9, 10
SERVICE ......................................................................................................................................................11
STORAGE .................................................................................................................................................... 12
TRANSPORTING ......................................................................................................................................... 13
SPECIFICATIONS ....................................................................................................................................... 14
PARTS SECTION ........................................................................................................................................ 15
FRAME GROUP ................................................ FIGURE 1 ................................................................. 16, 17
MAIN GROUP-LAWNAIRE IV ............................ FIGURE 2 ................................................................. 18, 19
MAIN GROUP-LAWNAIRE V ............................. FIGURE 3 ................................................................. 20, 21
HANDLE GROUP .............................................. FIGURE 4 ................................................................. 22, 23
TINE WHEEL GROUP ....................................... FIGURE 5 ................................................................. 24, 25
DRUM GROUP .................................................. FIGURE 6 ................................................................. 26, 27
DECAL GROUP-LAWNAIRE IV ......................... FIGURE 7 ................................................................. 28, 29
DECAL GROUP-LAWNAIRE V .......................... FIGURE 8 ................................................................. 30, 31

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Lawnaire
IV & V
MODEL NUMBER: This number appears on
sales literature, technical manuals and price lists.
SERIAL NUMBER: This number appears only
on your mower. It contains the model number
followed consecutively by the serial number. Use
this number when ordering parts or seeking
warranty information.
SAFETY
NOTICE !!!
Unauthorized modifications may present extreme
safety hazards to operators and bystanders and
could also result in product damage.
Textron Golf, Turf & Specialty Products strongly
warns against, rejects and disclaims any
modifications, add-on accessories or product
alterations that are not designed, developed, tested
and approved by Textron Golf, Turf & Specialty
Products Engineering Department. Any Textron
Golf, Turf & Specialty Products product that is altered,
modified or changed in any manner not specifically
authorized after original manufacture–including the
addition of “after-market” accessories or component
parts not specifically approved by Textron Golf, Turf
& Specialty Products–will result in the Textron Golf,
Turf & Specialty Products Warranty being voided.
Any and all liability for personal injury and/or property
damage caused by any unauthorized modifications,
add-on accessories or products not approved by
Textron Golf, Turf & Specialty Products will be
considered the responsibility of the individual(s) or
company designing and/or making such changes.
Textron Golf, Turf & Specialty Products will vigorously
pursue full indemnification and costs from any party
responsible for such unauthorized post-manufacture
modifications and/or accessories should personal
injury and/or property damage result.
This symbol means:
ATTENTION!
BECOME ALERT!
Your safety and the safety of others is involved.
Signal word definitions:
The signal words below are used to identify levels of
hazard seriousness. These words appear in this
manual and on the safety labels attached to Textron
Golf, Turf & Specialty Products machines. For your
safety and the safety of others, read and follow the
information given with these signal words and/or the
symbol shown above.
DANGER indicates an imminently hazardous
situation which, if not avoided, WILL result in death
or serious injury.
WARNINGindicates a potentially hazardous situation
which, if not avoided, COULD result in death or
serious injury.
CAUTION indicates a potentially hazardous situation
which, if not avoided, MAY result in minor or moderate
injury. It may also be used to alert against unsafe
practices or property damage.
CAUTION used without the safety alert symbol
indicates a potentially hazardous situation which, if
not avoided, MAY result in property damage.

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Lawnaire
IV & V
SAFETY AND OPERATION DECALS
Operating Instructions
This decal can be found on top of the handlebar
assembly. It tells the operator the steps involved; prior
to aerating; loading and transporting and how to aerate.
Warning Hands In Moving Components
This decal is located on the main frame and provides
the operator with three message warnings.
(1) The symbol on the left shows the possible result of
working on machinery with safety shields removed.
Hands and fingers may become entangled in belts. DO
NOT operate the unit without safety shields in place.
(2) The center symbol warns the operator and/or
bystanders to keep hands out of moving components.
(3) The right symbol instructs the operator to read the
service section of the operators manual. Disable spark
plug wire before performing any service or maintenance
on the unit.
Engine Oil Level
This decal is located on the main frame, in front of the
engine. It tells the operator to have the engine level
prior to checking the oil level.
Danger Hands And Feet
This decal is located on the main frame and informs the
operator of areas which are capable of serious injury.
The symbol shows fingers being cut or severed. DO
NOT place hands, feet, fingers or toes under aerator
while operating the unit.
Handle Warning-Lawnaire IV Only
This decal is located on the lower end of the handlebars.
It informs the operator that the folding handlebars need
to be securely locked in place prior to aerating.
Throttle Control
This decal is located on the handlebar next to the
engine throttle control. It tells the operator which
direction to move the engine throttle for the desired
engine speed. The throttle control decal uses the turtle
to represent slower engine speeds, and the rabbit to
represent faster engine speeds.

4
Lawnaire
IV & V
ASSEMBLY/SET-UP INSTRUCTIONS
GENERAL NOTE: FRONT, REAR, RIGHT HAND AND LEFT HAND REFERENCES BELOW
ARE WITH RESPECT TO AN OPERATOR AT THE CONTROLS.
UNPACKING - Unpacking the aerator entails
securing the handle and rolling the unit off the
shipping pallet.
1. Cut the banding securing the aerator to the
pallet
Banding is under tension and may snap back
when cut. Wear eye protection and stay clear
when cutting the band.
2. Unfold handle by pulling on the transport lift
handle A.
FOR LAWNAIRE V MODELS
1. Bolt the handle Bin place, as shown.
2. Pull up on the transport lift handle Cto raise the
aerator to the transport position.
3. Carefully roll the unit off the pallet.

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Lawnaire
IV & V
ASSEMBLY/SET-UP INSTRUCTIONS
FOR LAWNAIRE IV MODELS
1. Flip the handle locking knobs Dup into position
over the handle bracket Eand tighten. HAND
TIGHTEN ONLY!.
2. Pull up on the transport lift handle Cto raise the
aerator to the transport position.
3. Carefully roll the unit off the pallet.
NOTE: If the folding handle will not be used, bolt the
handle in place. See instructions in the
preceding section, for Lawnaire V Models.
CHECKING THE CLUTCH CABLE- The clutch
cable is adjusted prior to shipping; however, it
should be checked before the unit is put into
service.
1. Pull the clutch control handle Dback and down
and make sure the idler engages the belt.
2. Release the clutch control handle Dand make
sure the belt disengages completely.
3. If adjustment is necessary, loosen nut Eon the
clutch spring hardware and adjust its position in
the slot of the clutch lever.
NOTE: Spring extension should not exceed .25 inch

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Lawnaire
IV & V
ASSEMBLY/SET-UP INSTRUCTIONS
CHECKING THE THROTTLE CABLE- The throttle cable is adjusted prior to shipping; however, it should be
checked before the unit is put into service. The throttle control should freely move in a full range of
motion forward and backward. If necessary, the throttle cable can be adjusted as follows:
FOR BRIGGS AND STRATTON ENGINES:
1. Loosen the throttle friction wing nut Fto allow
free movement of the throttle control G.
2. Loosen the casing clamp screw Hon the control
plate.
3. Push throttle lever all the way forward.
4. Push throttle cable sleeve Jup through cable
clamp until fully advanced.
5. Tighten the casing clamp screw H.
FOR HONDA ENGINES:
1. Loosen the throttle lever friction nut Kenough to
allow free movement of the throttle lever L.
2. Loosen throttle cable clamp M.
3. Push throttle lever all the way forward.
4. Push throttle cable sleeve Nup through cable
clamp until fully advanced.
5. Tighten the casing clamp screw M.
INITIAL BELT SEATING AND ADJUSTMENT
Proper tensioning of V-belts is the single most
important factor necesssary for long, satisfactory
operation. Too little tension will result in
slippage, causing rapid belt and pulley wear.
Too much tension can result in excessive stress
on belts, bearings, shafts, reduced efficiency
and operator fatigue due to excessive force
required to hold the bail closed.
1. Operate the drive a few minutes to seat the belts
in the sheave grooves. Observe the operation of
the drive under its highest load condition (usually
starting).
2. Check the tension on a new drive serveral times
during the first 2 hours of opertion.
3. Keep the drive free of foreign material which
might cause slippage or damage to the belt and
sheave surfaces.
4. If a V-belt slips, it is too loose. NEVER apply belt
dressing, as this will damage the belt and cause
early failure.
5. Make sure pulleys stay in proper alignment.
Misaligned pulleys can result in belt rolling in the
pulley groove causing belt damage or breakage.

7
Lawnaire
IV & V
CONTROLS
HANDLE CONTROLS
Transport Lift Handle A - Pushing down on the
handle lowers the tines for aerating. Pulling the
handle up raises the tines so the aerator can be
moved or transported without incurring damage
to the unit or the turf.
Clutch Control Handle (Bail) B - Engages the belt
tightener clutch. Pulling back on the handle
engages the clutch; releasing the handle
disengages the clutch.
Releasing the clutch on an incline will cause
freewheeling, which will allow the unit to roll
down the incline.
Throttle Control C - The throttle control, located on
the handle, adjusts the engine speed. Pushing
the control forward increases the speed; pulling
the control back reduces the speed.

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Lawnaire
IV & V
CONTROLS
ENGINE CONTROLS
The Lawnaire IV & V are available with either a
3.5 HP Briggs & Stratton engine or a 4 HP
Honda engine.
Briggs & Stratton Engine Controls
The engine is equipped with an On/Off control A,
a choke control Band fuel shut-off valve C. The
On/Off control must be in the "ON" position for
the engine to be started. Turning the On/Off
control to the "OFF" position will stop the engine.
Using the choke control will help start a cold
engine. After the engine starts, adjust the choke
for best running results. Once the engine warms
up, the choke should not be needed.
Honda Engine Controls
The engine is equipped with a choke A, a fuel
valve Band an On/Off switch C. The fuel valve
and the On/Off switch must both be in the "ON"
position to start the engine. Turn the On/Off
switch to "OFF" to stop the engine. Using the
choke will help start a cold engine. After the
engine starts, adjust the choke for best running
results. Once the engine warms, the choke
should not be needed.