Bolens 120-337A User Manual
.50
ASSEMBLY
OPERATION
MAINTENANCE
PARTS LIST
IMPORTANT:
Read Safety Rules
and Instructions
PRINTED IN U.S.A.
MODEL NUMBERS
120-337A
120-337-300
22"
REAR DISCHARGE
SELF-PROPELLED
MOWERS
FORM NO. 770-0102
INDEX
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.3
.4
.8
.9
10
12
12
Belt Removal
Handle Storage .....................
Off-Season Storage
Exploded Parts View
Repair Parts List
Parts Information
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Back Cover
LIMITED WARRANTY
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 any parts submitted for replacement under this warranty 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,
excessive use, accident, neglect, improper maintenance, alterations, or unless the unit
has been operated and maintained in accordance with the instructions furnished. This
warranty does not apply to the engine, motor, battery, battery charger or component parts
thereof. Please refer to the applicable manufacturer’s warranty on these items.
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.
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The return of a complete unit will not be accepted by the factory unless prior written
permission has been extended by MTD.
This warranty gives you specific legal rights. You may also have other rights which vary
from state to state.
WARNING \
®c
TO PURCHASERS
OF INTERNAL COMBUSTION ENGINE EQUIPPED
MACHINERY OR DEVICES IN THE STATE OF CALIFORNIA
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.
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IMPORTANT
It is suggested that this manual be read in its entirety before attempting to assemble or operate. Keep this
manual in a safe place for future reference and for ordering replacement parts.
This unit is shipped WITHOUT GASOLINE or OIL. See operating section of this manual for proper fuel and
engine oil recommendations.
Your rotary mower is a precision piece of power equipment, not a plaything. Therefore, exercise extreme
caution at all times.
SAFE OPERATION PRACTICES FOR WALK-BEHIND MOWERS
TRAINING
1. Read the Operating and Service Owner’s
Manual carefully. Be thoroughly familiar with
the controls and the proper use of the equip
ment.
2. Never allow children to operate a power
mower. Only persons well acquainted with
these rules of safe operation should be allow
ed to use your mower.
3. 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 overlook
ed and could be accidently thrown by the
mower in any direction.
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.
2. Do not operate equipment when barefoot or
wearing open sandals. Always wear substan
tial footwear.
3. Do not wear loose fitting clothing that could
get caught on the mower.
4. Check the fuel before starting the engine. Do
not fill the gasoline tank indoors, when the
engine is running, or while the engine is still
hot. Wipe off any spilled gasoline before start
ing the engine.
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 daylight 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.
3. Stop the blade(s) when crossing gravel drives,
walks or roads.
4. After striking a foreign object, stop the
engine, remove the wire from the spark plug, 3
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(s) have stopped completely. Discon
nect the spark plug wire and keep the wire
away from the plug to prevent accidental start
ing.
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 cat
cher 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
equipment specifications.
FIGURE1.
Lower Handle
Handle
'Mount
Bracket
ASSEMBLY
INSTRUCTIONS
Contents of Hardware Pack
A (2) Hand Knobs
B (2) Curved Carriage Bolts 5/16-18 X 1.75" Long
C (1) Hex Bolt 1/4-20x1.50" Long
“D (1) Hex Lock Nut 1/4-20Thd.
E (2) Hairpin Cotters
F (3) Cable Ties
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.
Extend the throttle control which is attached
to the mower and place on the floor. Be
careful not to bend or kink control wire.
Place lower handle in position over weld pins
in handle mount brackets on deck. Secure by
placing two hairpin cotters (E) in inner hole on
weld pins. See figure 2.
FIGURE 2.
Outer
Hole
(For Storage)
FIGURES.
NOTE
It may be necessary to bend the
ends of the lower handle inward
slightly to assure a snug fit against
the bracket mounting area.
Inner
Hole
(For Operation)
NOTE
There are two (2) holes in the handle
mount brackets. Place hairpin cotter
in the inner hole for operation. The
outer hole is for storage. See figure
3.
FIGURE 4.
Lower
Handle
■_ iiH i ff.'i
There are two height positions for the handle.
Place upper handle (with the clutch control at
tached) in position over lower handle, select
ing hole for either high or low position. Refer
to figure 24. Secure with two curved carriage
bolts (B) and hand knobs (A) as shown in
figure 4. The knobs can be either to the inside
ortheoutsideof the handle.
5. Place the throttle control in position on the
left hand side of upper handle. Secure with
hex bolt (C) and hex lock nut (D) provided. See
figures.
FIGURES.
/.-• * r- Vu ?«■
Cable
Tie (F)
NOTE
Reference to left or right side of
machine is from operator’s position
at the handle facing forward.
6. Secure throttle control cable and clutch cable
__
to handle with cable ties (F) provided. See
figures.
7. Check all nuts and bolts for correct tightness.
FIGURES.
r^.
FIGURE 7.
^
Upper Frame
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Lower Frame Ass
ASSEMBLY
Grass Catcher
.The grass catcher is partially assembled. See
figure 7.
Grass Bag
.Upper
Frame
Lower Frame/
Assembly '
FIGURE 8.
Bottom of Bag
Frame
1. Place the upper frame over the lower frame
assembly as shown in figure 8.
2. Place bag over frame (black plastic side is the
bottom of bag). Upper frame goes to the top of
bag.
3. Secure bag to frame by slipping plastic chan
nels on bag over frame. See figure 9.
FIGURE 9.
Plastic Channels
TO ATTACH BAG TO MOWER
I WARNING \
DO NOT operate the mower with the
chute door open unless the com
plete grass catcher is properly
mounted on the mower.
FIGURE 10.
FIGURE11.
Grass Catcher
Frame
1. Attach the grass catcher frame to grass
catcher hitch bracket on rear of the mower by
hooking grass catcher into hooks on grass
catcher hitch bracket. See figure 10.
Lift the rear of grass catcher up. The roller on
2.
the grass catcher will push the chute door on
the mower open. See figure 10.
NOTE
Figure 10 is shown with the chute
door open for photo clarity only.
3. Move the locking lever forward and hook In
slot on mower. See figures 11 and 12.
Locking Lever yjtr '
Locked in Slot on
Mower'
FIGURE 12.
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