Bolens 122-336-120 User Manual
.75
20" REAR DISCHARGE
SELF-PROPELLED
ROTARY MOWERS
Important: Model Numbers
Read Safety Rules and 122-336A
Instructions Carefully 122-336-120
Thank y<iu
for purchasing an
American buiit product.
PRiNTED iN U.S.A.
FORM NO. 770-2054
INDEX
Safe Operation Practices
Assembiy instructions
Operation........................................................................9
Adjustments................................................................ 11
Lubrication
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LIMITED WARRANTY
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For one year from the date of original retail purchase, MTD PRODUCTS INC will either
repair or replace, at its option, free of charge, F.O.B. factory or authorized service firm, any
part or parts found to be defective in material or workmanship. Transportation charges for
the movement of any power equipment unit or attachment are the responsibility of the pur
chaser. Transportation charges for any parts submitted for replacement under this warran
ty must be paid by the purchaser unless such return is requested by MTD PRODUCTS INC.
This warranty will not apply to any part which has become inoperative due to misuse, ex
cessive use, accident, neglect, improper maintenance, alterations, or unless the unit has
been operated and maintained in accordance with the instructions furnished. This warran
ty does not apply to the engine, motor, battery, battery chargeror component parts thereof.
Please refer to the applicable manufacturer’s warranty on these items.
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3
4
Maintenance .............................................................. 12
Off-Season Storage
iiiustrated Parts
Repair Parts Lists
Parts Information
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Back Cover
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18,20,22
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This warranty will not apply where the unit has been used commercially.
Warranty service is available through your local authorized service dealer or distributor. If
you do not know the dealer or distributor in your area, please write to the Customer Service
Department of MTD.
The return of a complete unit will not be accepted by the factory unless prior written per
mission has been extended by MTD.
This warranty gives you specific legal rights. You may also have other rights which vary
from state to state.
TO PURCHASERS
OF INTERNAL COMBUSTION ENGINE EQUIPPED
MACHINERY OR DEVICES IN THE STATE OF CALIFORNIA
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The equipment which you have just purchased does not have a spark arrester. If this equipment is used on
any forest covered land, brush covered land, or grass covered unimproved land in the State of California,
before using on such land, the California law requires that a spark arrester be provided. In addition, spark
arrester is required by law to be in effective working order. The spark arrester must be attached to the
exhaust system and comply with Section 4442 of the California Public Resources Code.
^ WARNING ^
To reduce the potential for any injury, comply with the foilowing safety instructions. Failure to comply with
(D
the instructions may result in personal Injury.
SAFE OPERATION PRACTICES FOR WALK-BEHIND MOWERS
TRAINING
1. It is suggested that this manuai be read in its
entirety before attempting to assemble or
operate this unit. Keep this manual in a safe
place for future reference and for ordering
replacement parts.
2. Your rotary mower is a precision piece of
power equipment, not a plaything. Therefore,
exercise extreme caution at all times.
3. Read this Owner’s Manuai carefully. Be
thoroughly familiar with the controls and the
proper use of the equipment.
4. Never ailow chiidren to operate a power
mower. Oniy persons well acquainted with
these rules of safe operation should be al
lowed to use your mower.
5. Keep the area of operation clear of all per
sons, particularly small children and pets.
Stop engine when they are in the vicinity of
your mower. Although the area of operation
should be completely cleared of foreign ob
jects, a small object may have been over
looked and could be accidently thrown by the
mower in any direction and cause injury.
PREPARATION
1. Thoroughly inspect the area where the equip
ment is to be used. Remove all stones, sticks,
wire, bones and other foreign objects which
could be picked up and thrown by the mower
in any direction and cause injury.
2. Do not operate equipment when barefoot or
wearing open sandais. Aiways wear substan-
tiai footwear.
3. Do not wear loose fitting clothing that could
get caught on the mower.
4. Check the fuel before starting the engine.
Gasoline is an extremely flammable fuel. Do
not fill the gasoline tank indoors, while the
engine is running, or while the engine is stili
hot. Wipe off any spiiied gasoline before start
ing the engine as it may cause a fire or explo
sion.
5. Disengage the self-propelled mechanism or
drive clutch on units so equipped before start
ing the engine.
6. Never attempt to make a wheel or cutting
height adjustment while the engine is run
ning.
7. Mow only in dayiight or in good artificial light.
8. Never operate the equipment in wet grass.
Always be sure of your footing. Keep a firm
hold on the handle and walk, never run.
OPERATION
1. Do not change the engine governor settings
or overspeed the engine. Excessive engine
speeds are dangerous.
2. Do not put hands or feet near or under rotating
parts. Keep clear of the discharge opening at
all times as the rotating blade can cause in
jury.
3. Stop the blade when crossing gravel drives,
walks or roads.
4. After striking a foreign object, stop the
3 equipment specifications.
engine, remove the wire from the spark plug,
and thoroughly inspect the mower for any
damage. Repair the damage before restarting
and operating the mower.
5. If the equipment should start to vibrate abnor
mally, stop the engine and check immediately
for the cause. Vibration is generally a warning
of trouble.
6. Stop the engine whenever you leave the
mower, before cleaning the mower housing,
and when making any repairs or inspections.
7. When cleaning, repairing or inspecting, make
certain the blade and all moving parts have
stopped. Disconnect the spark plug wire, and
keep the wire away from the plug to prevent
accidental starting.
8. Before attempting to unclog the mower or
discharge chute, stop the engine and be sure
the blade has stopped completely. The cut
ting blade continues to rotate for a few
seconds after the engine is shut off. Never
place any part of the body in the blade area un
til you are sure the blade has stopped rotating.
Disconnect the spark plug wire and keep the
wire away from the plug to prevent accidental
starting.
9. Do not run the engine indoors.
10. Shut the engine off and wait until the blade
comes to a complete stop before removing
the grass catcher or unclogging chute.
11. Mow across the face of slopes, never up-anddown. Exercise extreme caution when chang
ing direction on slopes. Do not mow ex
cessively steep slopes.
12. Always disconnect electric mowers (line
operated) before cleaning, repairing or ad
justing.
13. Never operate mower without proper guards,
plates or other safety protective devices in
place.
14. Keep washout ports and other mower-housing
service openings closed when mowing.
15. DO NOT OPERATE this mower with the chute
doors open, unless the complete grass catch
er is properly mounted on the mower.
MAINTENANCE AND STORAGE
1. Check the blade and engine mounting bolts at
frequent intervals for proper tightness.
2. Keep all nuts, bolts, and screws tight to be
sure the equipment is in safe working condi
tion.
3. Never store the equipment with gasoline in
the tank inside of a building where fumes may
reach an open flame or spark. Allow the
engine to cool before storing in any
enclosure.
4. To reduce fire hazard, keep the engine free of
grass, leaves, or excessive grease.
5. Check the grass catcher bag frequently for
wear or deterioration. For safety protection,
replace only with new bag meeting original
-if
FIGURE 1.
A-
B-
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11
Lr
ASSEMBLY
INSTRUCTIONS
NOTE
This unit is shipped WITHOUT GAS
OLINE or OIL. After assembly, see
operating section of this manual for
proper fuel and engine oil recom
mendations.
-Contents of Hardware Pack:
H
A (2)
G (2)
I (7) Truss Head Bolts 3/8" Long
J (7) External Lock Washers
-K (7) Hex Nuts#10-24Thread
L (2) Cotter Pins
M (2) Tubing Connectors
Hairpin Cotters
Ferrule
B (1)
C (2)
Curved Carriage Bolts 5/16-18 x 1.75" Long
D (2)
Hand Knobs
Hex Bolt 1/4-20 X 1.50" Long
E (1)
Hex Center Lock Nut i/4-20Thd.
F (1)
Cable Ties
H (1)
Ferrule Locking Ring
FIGUREZ
FIGURES.
1. Remove the lawn mower, loose parts, hard
ware pack and literature from the carton.
Make certain all parts and literature have been
removed before the carton is discarded.
2.
Extend the throttle control which is attached
to the engine and place on the floor. Be
careful not to bend or kink control wire.
Fasten lower handle in position over weld
3.
pins in handle mount brackets on deck. The
hole for the engagement rod in the lower han
dle must be on the left side of the unit.
Secure with hairpin cotters (A) in inner hole on
■weld pin. See figure 3.
NOTE
Reference to right hand or left hand
side of the mower is observed from
the operating position.
NOTE
It may be necessary to squeeze the
ends of the lower handle in slightly
to assure a snug fit against the han
dle brackets.
FIGURE 4.
Upper
Handle
Hex Screw (D)
Throttle
Control
NOTE
There are two (2) holes in the handle
mount brackets. Place the lower
-handle against the brackets and
secure with hairpin cotter in the in
ner hole. Inner hole is for operation.
Outer hole is for storage. See figure
4.
4. Assemble upper handle to lower handle.
Secure with two curved carriage bolts (C) and
hand knobs (D) as shown in figure 5. The hand
knobs may be assembled either to the inside
or the outside of the handle.
NOTE
-There are two height positions for
the handle. See adjustment section.
FIGURE 5.
5. Place the throttle control in position on left
side of upper handle. Secure with hex bolt (E)
and lock nut (F). See figure 5.
■6. Secure throttle control cable to upper and
lower handles with cable ties (G) provided.
See figure 6.
7. Check all nuts and bolts for correct tightness.
Cable
FIGURES.
FIGURE 7.
Ferrule
Locking
Ring (H)
Ferrule
Engagement Rod
8. Hook the end of engagement rod into idler
—bracket located inside slot on belt cover. See
figure 7.
9. Pull the engagement rod back until the idler
bracket is at the rear of the slot on belt cover.
10. With handle in the down position (released),
place ferrule (B) on threaded end of engage
ment rod. Thread ferrule onto engagement rod
until it lines up with the hole in lower handle.
11.---Place ferrule into hole in lower handle. Secure
------
with ferrule locking ring (H). See figure 8.
12. Check the engagement rod adjustment.
Disconnect the spark plug wire from the spark
plug. Pull the recoil starter handle without
raising the mower handle. If the mower does
not move forward, adjustment is correct. If the
mower moves forward, remove the ferrule
locking ring from the ferrule and thread in or
out one turn. Repeat the above check as
necessary.
FIGURES.
Rear
Frame
FIGURE 9.
Grass Catcher Assembly
1. Connect the front and the rear frames by
— pushing the tubing connectors (M) onto the
ends of the frames. See figure 9.
Start Bolts (I)
Lock Washers (J)
and Hex Nuts (K
Leave Bottom Side
Bolts Out
FIGURE 10.
2. Slip frame into grass bag. The black plastic is
the bottom of the grass bag. Fasten edges of
bag (with eyelets) to front frame with 3/8"
—bolts (I), lock washers (J) and hex nuts (K).
Finger tighten. See figure 10. Hint: For easier
assembly Do Not fasten lower bolts on sides
until after step 3.
Cotter Pin (L)
3. Stand bag on end with open end up. Pull bot
tom of bag forward into slot. Align holes and
—slip cotter pins (L) into holes. Spread ends of
pins to secure bag to frame. See figure 11.
Tighten all nuts and bolts securely with
screwdriver.
FIGURE 11.
FIGURE 12.
To Attach Bag to Mower
\ WARNING \
■ Under no circumstances should the
doors be opened while the engine is
operating unless the grass catcher
is securely in place.
FIGURE 13.
1. Attach the grass catcher frame to the front of
-----
the adapter as shown in figure 13.
Tilt bag slightly forward and slide roll pin on
-bag frame into slot on mower. See figure 14.
Push down on bag to position on mower.
FIGURE 14.
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