Bolens 139-402A User Manual
ASSEMBLY
OPERATION
PARTS
MAINTENANCE
FIFTY CENTS
MODEL
NO.
139-402A
26”
RIDING
IMPORTANT:
READ SAFETY RULES
S INSTRUCTIONS
MOWER
PRINTED IN U.S.A.
■'ll
.........■«'iiife,
FORM No. 770-8281
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
under this warranty must be paid by the purchaser unless 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.
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 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.
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. After assembly, see operating section of this manual for
proper fuel and amount.
Your rotary mower is a precision piece of power equipment, not a plaything. Therefore exercise extreme
caution at all times.
SAFE OPERATION PRACTICES FOR RIDING VEHICLES
1. Know the controls and how to stop quickly—
READ THE OWNER’S MANUAL.
2. Do not allow children to operate vehicle. Do
not allow adults to operate it without proper
instruction. Only persons well acquainted
with these rules of safe operation should be
allowed to use your mower.
3. Do not carry passengers.
4. Keep the area of operation clear of all
persons, 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
objects, a small object may have been over
looked and could be accidently thrown by the
mower in any direction.
5. Clear work area of objects which might be
picked up and thrown by the mower in any
direction.
6. Disengage all attachment clutches and shift
into neutral before attempting to start engine.
N 7. Disengage power to attachment(s) and stop
engine before leaving operator position.
8. Disengage power to attachment(s) and stop
engine before making any repairs or adjust
ments. Disconnect the spark plug wire and
keep the wire away from the plug to prevent
accidental starting.
9. Before attempting to unclog thé mower or
discharge chute, stop the engine and be sure
the blade(s) have stopped completely. Dis
connect the spark plug wire and keep the wire
away from the plug to prevent accidental
starting.
10. Disengage power to attachment(s) when
transporting or not in use.
11. Take all possible precautions when leaving
vehicle unattended such as disengaging
power-take-off, lowering attachments, shift
ing into neutral, setting parking brake,
stopping engine and removing key.
12. Do not stop or start suddenly when going
uphili or downhill. Mow up and down face of
steep slopes ; never across the face.
13. Reduce speed on slopes and in sharp turns to
prevent tipping or loss of control. Exercise
extreme caution when changing direction on
slopes.
14. Stay alert for holes in terrain and other hidden
hazards.
5. Use care when pulling loads or using heavy
equipment.
A. Use only approved drawbar hitch points.
B. Limit loads to those you can safely
control.
C. Do not turn sharply. Use care when
backing.
D. Use counterweight(s) or wheel weights
when suggested in owner’s manual.
16. Watch out for traffic when crossing or near
roadways.
17. When using any attachments never direct dis
charge of material toward bystanders nor
allow anyone near vehicle while in operation.
18. Handle gasoline with care—it is highly
flammable.
A. Use approved gasoline container.
B. Never remove cap or add gasoline to a
running or hot engine or fill fuel tank
indoors. Wipe up spilled gasoline.
C. Open doors if engine is run in garage-
exhaust fumes are dangerous. Do not run
engine indoors.
Keep the vehicle and attachments in good
19.
operating condition, and keep safety devices
in place. Use guards as instructed in owner’s
manual.
Keep all nuts, bolts, and screws tight to be
20.
sure the equipment is in safe working condi
tion.
Never store the equipment with gasoline in
21.
the tank inside a building where fumes may
reach an open flame or ispark. Allow engine to
cool before storing in any enclosure.
To reduce fire hazard keep engine free of
22.
grass, leaves or excessive grease.
23.
The vehicle and attachments should be
stopped and inspected for damage after
striking a foreign object, and the damage
should be repaired before restarting and
operating the equipment.
24.
Do not change the engine governor settings or
overSpeed the engine.
When using the vehicle with mower, proceed
25.
as follows :
(1) Mow only in daylight or in good artificial
light.
(2) Never make a cutting height adjustment
while engine is running if operator must
dismount to do so.
(3) Shut the engine off and wait until the
blade comes to a complete stop before
removing the grass catcher.
(4) Check blade mounting bolts for proper
tightness at frequent intervals.
Check grass catcher bags frequently for wear
26.
or deterioration. For safety protection replace
only with new bag meeting original equip
ment specifications.
Look behind to make sure the area is clear
27.
before placing the transmission in reverse and
backing up.
INDEX
Limited Warranty.................................................... 2
Safe Operation Practices....................................... 3
index and Steering Wheei Assembiy
Controls.................................................................. 6
Operating Instructions........................................... 7
Maintenance and Adjustments
Belt Removal.........................................................11
Lubrication.............................................................12
Off-Season Storage............................................. 13
Trouble Shooting Chart
GRASS CATCHER Model No. 199-015A is availa
ble as optional equipment for the mowers shown
in this manual.
The mower should not be operated
without the entire grass catcher or
chute deflector in place.
........................................
WARNING
...................
.............................
j
4
9
14
Schematic of Electrical System
Differential Assembly............................................. 16
Reversing Transmission
Illustrated Parts for Main Body.......................■ ■ ■ -18
Parts List for Main Body.
Illustrated Parts for Frame View.............................
Parts List for Frame View
Illustrated Parts for Deck and Belt System. 22 & 24
Parts List for Deck and Belt System
Parts Information
1. Lubricate tire beads and
flanaes.
2. Do not exceed 30 P.S.I. when
seating beads.
3. Adjust to recommended pressure
after beads are sealed.
....................................
Installation of tire to rim :
........................................
kCAUTION
............................
.......................................
......................................
............
23 & 25
Back Cover
rim
15
17
19
20
21
NOTE
Under normal usage bag material is
subject to wear, and should be
checked periodically. Be sure any re
placement bag complies with the
mower manufacturer’s recommen
dations.
For replacement bags, use only fac
tory authorized replacement bag No.
764-0121.
IMPORTANT
After striking a foreign object, stop
the engine. Remove wire from spark
plug, thoroughly inspect the mower
for any damage, and repair the dam
age before restarting and operating
the mower.
The steering wheel with the necessary hardware,
are easily assembled to the machine.
TIRE PRESSURE
FOR SHIPPING PURPOSES, THE TIRES ON
YOUR UNIT MAY BE OVER-INFLATED. TIRE
PRESSURE SHOULD BE REDUCED BEFORE
UNIT IS PUT INTO OPERATION. PRESSURE
SHOULD BE APPROXIMATELY 15 P.S.I. EQUAL
TIRE PRESSURE SHOULD BE MAINTAINED ON
ALL TIRES. MAXIMUM TIRE PRESSURE IS 30
P.S.I.
ASSEMBLY
NOTE
Reference to right-hand or left-hand
side of machine is from the driver’s
seat facing forward.
SEAT ASSEMBLY
To secure seat to cover assembly, line up the four
holes in bottom of seat with four corresponding
holes in cover. Then insert four hex screws ^^-20 x
V2” long up through holes, tightening with an
adjustable wrench.
STEERING WHEEL ASSEMBLY See figures 1, 2
and 3.
NOTE
Due to vibration during shipment, it
is possible that the steering shaft on
your unit may have dropped to a po
sition where alignment of parts is
difficult. This must be kept in mind
during the assembly operation.
1. Check the upper and lower hex bearings, be
sure they are seated and in position. See
figure 1.
2. Place your hand under the front of the unit,
push up on the steering shaft assembly.
3. Hold up the shaft assembly. Place the
steering tube assembly on the shaft and start
the hex screw through the hole. See figure 2.
4. Fasten the tubing assembly to the steering
shaft assembly with hex screw and hex nut
provided.
Steering Wheel Cap
Hex Nut
Belleville Washer
Steering Tube
Steering Wheel
Cover
Hex Screw
Assembly
Hex Nut
Steering Shaft Assembly
Speed Nut
Flatwasher
Upper Hex Bearing
FIGURES.
Lower Hex Bearing
FIGURE 1. STEERING ASSEMBLY
7. Secure cover to support bracket with two
truss machine screws provided. See figure 4.
FIGURE 4.
8. Place the steering wheel on the tubing
assembly and fasten with belleville washer
FIGURE 2. STEERING TUBE ASSEMBLY
5. Place two speed nuts on support bracket, as 9. Again, it may be necessary to raise the
shown in figures. steering shaft assembly in order to put the
6. Place the cover over the steering tube
assembly, line up holes in cover with speed 10. Place the steering wheel cap on by hand. See
nuts. See figures. figures.
and hex nut. See figure 1.
hex nut on.
Steering Wheel Cap
CONTROLS See figures 6 and 9.
Speed Control lif* Disengagement!
X"«“» ignition^witch
FIGURE 6. CONTROLS
This manual should be read in its entirety before
you operate your Riding Mower. The more you
know and understand about the machine and its
operation, the better job it will do for you. While
reading the manual, compare the illustrations
with your mower to familiarize yourself with the
locations of various controls, lubrication points,
attachments and adjustment features.
Study the operating instructions and safety
precautions thoroughly to insure proper function
ing of your mower and to prevent injury to yourself
and others. Be sure to save this manual for future
reference.
THROTTLE CONTROL
The throttle control is used to regulate the engine
speed and to activate the choke on the engine. To
get maximum efficiency from cutting, the throttle
should be in the FAST position when operating
the mower. Pushing the throttle all the way
forward, past FAST will choke the engine. See
figures.
IGNITION KEY
The key must be turned to the ON position before
you pull the recoil handle to start the engine.
Remove the key when the mower is not in use.
Turn the key to the left to the OFF position to stop
the engine. See figures 10 and 11.
LIFT AND DISENGAGEMENT LEVER
The lift and disengagement lever is used to raise
and lower the cutting deck, set the cutting height,
and disengage the cutting blades.
Move the lever to the right and move the lever all
the way back and lock it to disengage the blades.
The lever may be set in any one of the five cutting
height positions.
INTERLOCKS (Not shown)
An interlock safety switch is located on the clutch
pedal and the lift and disengagement lever.
The clutch pedal must be depressed down and
locked.
The lift and disengagement lever must be in the
STOP position (all the way back) before the engine
can be started. Failure to follow these instruc
tions will prevent starting.
GEAR SHIFT LEVER
The gear shift lever has three positions,
FORWARD, NEUTRAL and REVERSE. The clutch
pedal must be depressed and the riding mower
must not be moving when shifting gears. Do not
force the shift lever. Release the clutch pedal
slightly to line up the shifting collar in the
transmission. Then try to shift gears.
Brake Pedal Lock'
Shown in Lockfll' Position
CLUTCH PEDAL
The clutch pedal on the left side when depressed,
disengages the engine from the transmission. It
can be held in the disengaged position by lifting
the clutch lock. To stop the mower, depress the
clutch and brake pedals. See figure 8.
SPEED CONTROL KNOB
The speed control knob allows you to regulate the
ground speed of the riding mower. See figure 8.
NOTE
The further forward the speed con
trol knob is set, the slower the
ground speed.
Recoil Start Handle
FIGURE 7. BRAKE PEDAL LOCK
BRAKE
To operate the brake, depress the right pedal all
the way down. To lock the brake in park position,
depress the right pedal all the way down and lift
the brake lock. Pedal will stay in the depressed
position. To release the parking brake, depress
the pedal. See figure 7.
Clutch Pedal Lock
Shown in Locked Position-J
FIGURES. CONTROLS
OPERATING
INSTRUCTIONS
^ CAUTION
1. Keep all shields and guards in place.
2. Before leaving operator’s position:
Shift controls into neutral
Set parking brake (Brake Lock)
Disengage attachment drive
Shut off engine
Remove ignition key
3. Wait for all movement to stop before servicing j
machine.
4. Keep people and pets a safe distance away I
from machine.
FIGURE 8. CLUTCH PEDAL LOCK
A CAUTION
Parking brake must be disengaged
before unit is put into motion.
Unit is equipped with separate brake
and ciutch pedais. To efficientiy
stop, it is necessary to disengage
the ciutch when appiying the brakes.
STARTING THE ENGINE
NOTE
7. Slowly return the throttle to the running
position as soon as the engine starts.
8. To stop either model, turn the ignition key to
the OFF position. Remove the key when the
rider is not in use.
1. Be sure the crankcase is fiiled with oii as
recommended in the engine manual and put
regular gasoline in the gasoline tank.
2. Attach the wire to the spark plug.
3. Depress the clutch pedal and lock it down.
4. Move the lift and disengagement lever back to
the disengaged position and lock it.
5. Set the throttle control lever in the CHOKE
Dosition.
6. Turn the ignition key to the ON position.
Twist the recoil starter handle until it is free
and pull it with a quick steady motion. After
the engine starts, return the recoil starter
handle. Twist it until it locks. See figures 10
and 11.
NOTE
If these instructions are not followed
the engine will stop running when
the clutch or blade are engaged.
Recoil Handle Unlocked for j£fta(>uig
FIGURE 11. RECOIL HANDLE
FIGURE 10. RECOIL HANDLE
FIGURE 12. STARTER SWITCH
PUTTING THE RIDING MOWER IN MOTION
1. Advance the throttle control from % to full
throttle to prevent strain on the engine and to
operate the cutting blades.
2. Place the gear shift lever in either the
FORWARD or REVERSE position.
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