MTD Pro 18HP 48"" Stamped Deck Operator's And Service Manual
MMZ Jr .
Hydrostatic Zero-Turn
Riding Mower
MODEL
18HP
48" Stamped Deck
OPERATOR’S AND SERVICE MANUAL
TABLE OF CONTENTS
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General Safety Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
A.Danger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
B.Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
C.Caution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
A.General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
B.Related to Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
C.When Mowing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Safety Decals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
A.General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
B.Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
C.Initial Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
D.Zero Turn Break-In and Operating Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance and Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
A.Mower Deck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
B.Hydraulic Oil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
C.Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
D.Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
E.Brakes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
F.
Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
G.Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Maintenance Schedule. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Performance Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
A.High Speed Tracking Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
B.Engine RPM Check and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
C.Deck Corner Ball Wheel Roller Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
D.Deck Center Anti-Scalp Roller Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
E Lap Bar Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
F Deck Leveling Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Warranty
This product may be covered by one or more of the following patents:
D409,208; 5,946,894; 6,070,690
2
FORWARD
The 18HP MMZ Jr. Hydrostatic Zero-Turn Commercial Riding Mower provides superb maneuverability. The machine incorporates many safety features that should be studied by all operators befo re use. The list of safety precautions should receive particular attention.
This manual presents all of the operating and maintenance instructions necessary to keep
your mower at peak efficiency. If operated and maintained properly, your mower will give
dependable service.
CAUTION:
Only thoroughly trained persons should operate and maintain this
mower. This machine can cause serious injury to anyone who misuses it and does not understand its operation. For their personal
safety, all operators are required to read this entire manual before
operating the mower.
Hazard control and accident prevention are partially dependent
upon the design and configuration of the equipment. Notwithstanding, these factors are also dependent upon the awa reness, concern,
prudence and proper training of the personnel involved in the operation, transport, maintenance and storage of the equipment.
3
GENERAL SAFETY
OPERATIONS
A. DANGER
1. Do not operate machine in confined areas
where exhaust gases can accumulate.
2. Do not ope r ate m achin e wit ho ut mower chute
deflector in place and operational.
3. Do not carry passengers.
B. WARNING
1. Do not operate machines under the influence
of alcohol or drugs.
2. Do not operate machines without all guards
and safety devices in place and functional.
3. Do not start machines if there are fuel or oil
leaks or spillage — clean it up.
4. Do not operate machines near spilled or leaking fuels.
5. Do not stop or park machine over dry leaves,
grass, debris, etc. that could be combustible.
6. Use extreme care when backing up.
7. Do not operate machine on slopes greater
than 15 degrees (27%).
8. Do not operate machines on slopes when
traction is reduced (wet grass, ice, soft
ground, loose ground, leaves, pine needles,
debris, etc.) .
9. Avoid turning downhill if possible , go slowly
and use extra care when turning downhill.
10. Do not operate machines during reduce visibility (low light, fog, rain, etc.).
11. Do not operate machines with non-approved
attachments.
12. Do not operate machines that are dam-
aged.....have machine repaired.
13. Do not operate machines that have not been
properly maintained.
14. Use only replacement parts that are the same
or equivalent to the original equipment.
15. Do not modify machines or any of their components, especially the engine governor!
16. Do not operate machine for more than 2 hours
without hearing protection.
C. CAUTION
1. Use proper protective equipment when operating machine (gloves, boots, and hearing
protection are recommended).
2. Read entire machine Operator’s Manual.
3. Make sure operators are fully trained in the
safe use of the machine.
4. Follow all safety instructions when using the
machine.
5. Keep all safety signs legible and properly
installed.
6. Do not check for hydraulic leaks with any part
of the body.
7. Do not add fuel to a machine when the engine
is running and/or the e xhaust system is hot.
8. Keep machine clean and free of debris, grass,
leaves, oil, grease, etc.
9. Place lap bars in neutral/start position, set
park brake, disengage P.T.O., turn engine off,
and remove ignition key before you dismount
from machine.
10. Use machines laterally or diagonally acros s
slopes, avoid going downhill when possible.
11. Go slowly and use extra care when descending slopes.
12. Disengage P.T.O. when crossing surfaces
such as asphalt, conc rete, loose ground,
sand, gravel, etc.
13. Use extra care when loading and unloading
machines from trucks or trailers.
SAFETY PRECAUTIONS
A. General
1. Read this Operator’s Manual be fore starting
the mower. Study the controls and learn the
proper sequence of operation.
2. Do not allow anyone to operate or maintain
this machine who has not read this manual.
Never permit children to operate this machine.
3. Never carry passengers.
4. Do not remove any shields, guards or safety
devices. If a shield, guard or safety device is
damaged or does not function, repair or
replace it before operating the mower.
5. Always wear safety glasses and safety shoes
when operating or maintaining this mower . Do
not wear loose-fitting clothing.
6. Disconnect the spar k plug wires and remove
the key from the ignition to prevent the engine
from accidentally starting before performing
any maintenance on this mower.
7. Never run the engine indoors without adequate ventilation. Exhaust fumes are deadly.
8. To avoid serio us burns, do not touch the
engine, exhaust pipe or muffler while the
engine is running or until it has cooled after it
has been shut off.
9. The liquid in the battery is dilute sulfuric acid.
Always wear safety glasses and rubber gloves
when working on the battery. Do not overfill
the battery.
10. Lead-acid batteries generate hydrogen and
oxygen gases which form an explosive mixture. Keep sparks and flames away at all
times.
4
11. When looking for oil leaks, never run your
hand over hydraulic hoses, lines or fittings.
Never tighten or adjust hydraulic hoses, lines
or fittings while the system is under pressure.
If high-pressure oil penetrates the skin, the oil
must be removed within a few hours by a doctor familiar with this form of injury or serious
complications may result.
B. Related to Fuel
1. Fuel is highly flammable. Please respect it.
2. Do not smoke or permit others to smoke
while handling fuel.
3. Always use approved containers for fuel.
4. Always shut off the engine and permit it to
cool before removing the fuel tank cap.
5. Always fill the fuel tank outdoors.
6. If the fuel container spout will not fit inside the
fuel tank opening, use a funnel.
7. When filling the fuel tank, stop when the fuel
reaches one inch from the top. This space is
necessary for tank expansion.
8. Wipe up any spilled fuel.
Do not ov erfi ll
C. When Mowing
1. Keep adults, children and pets away from the
area to be mo wed.
2. When operating this mower in the forward
direction, DO NOT allow the steering lev ers to
return to the neutral position on their own.
Always maintain a firm grip on the levers,
operate them smoothly and avoid any sudden
movements of the levers when starting or
stopping.
3. If the mower is equipped for side discharge,
never use the mo wer without the discharge
chute installed and placed in the down position.
4. Always remove debris and other objects from
Note
the area to be mowed.(
grass will reduce traction.)
5. Mow only in daylight.
6. Watch for holes, sprinkler heads and other
hidden hazards.
7. Avoid driving too close to trees, creeks,
ditches, sand traps and other obstacles.
8. Before backing up, check behind you and
watch where you’re going.
9. Always reduce speed when making a turn,
and when grass is wet.
10. Always mow across slopes, never up and
down the slope. Do not operate on steep
slopes and slow down before turning.
11. Be careful when crossing gravel paths or
roadways. Always turn off the blade clut ch
switch and wait until the blades stop rotating
and raise the cutting deck to the transp ort
: debris and loose
position. Always allow other vehicles to have
the right-of-way.
12. If you hit a solid object while mowing, turn off
the blade clutch switch, place the left and right
steering levers in the neutral, opened-out
position, move the throttle to slow, set the
parking brake, shut off the engine and take
the key from the ignition switch. Inspect for
damage. Repair any damage. Make sure the
blades are in good condition and that the
blade bolts are tight before restarting the
engine.
13. Never leave the mower unattended without:
turning off the blade clutch switch; placing the
left and right steering levers in the neutral
opened-out position; moving the throttle to
slow; setting the parking brake; shutting off
the engine and taking the ke y from the ignition
switch.
14. Never walk or stand on the discharge side of a
mower with the engine running. Turn off the
.
blade clutch switch if another person
approaches while you are operating the
mower.
15. Never attempt to operate the traction unit
without the mowing deck attached.
16. Keep the mower and especially the engine
and hydraulic components clean and fre e of
grease, grass and leaves to reduce the
chance of fire and to permit proper cooling.
5
SAFETY DECALS AND LABELS
WARNING
SHIELD MISSING
DO NOT OPERATE
Part Number: 00030635
Part Number: 00030633
Part Number: 01003859
DANGER
Part Number: 01003858
ROTATING BLADE
Do not put hands or feet
under or into mower when
engine is running.
Part Number: 01003449
Part Number: 01003450
Part Number: 01003451
Part Number: 01003452
Part Number: 01003857
6
Part Number: 01002166
TO REDUCE THE RISK OF INJURY,
DO NOT OPERATE MOWER UNLESS
DISCHARGE CHUTE COVER OR GRA SS
CATCHER IS IN ITS PROPER PLACE.
DANGER
KEEP HANDS and FEET AWAY
SPECIFICATIONS
Engine:
Type:
Air Cleaner:
Lube System:
Starter:
Traction Drive:
Hydraulic Tank:
Cutter Deck;Drive:
Clutch:
Deck Lift:
Cutting Height:
No. of Blades
Controls:
Parking Brake:
Front Caster Wheels:
Tire Pressure:
Drive Wheels:
Frame:
Seat:
Fuel Tank:
Tool Box
Ground Speed:
Instrumentation
Net Weight:
18 HP Briggs and Stratton Vanguard
Vertical air cooled
Dual Element
Pressurized with oil filter
12-volt electric
Engine to two variable-speed hydraulic pump/motor BDR units to
gearbox on each drive wheel
10 quart capacity, One quart filter
48", Belt Driven
Electric
Hand lever w/pin lock for height adjustment
1-1/2" to 4"
3, belt-driven, power take-off from engine
Engine ignition and start switch; throttle; choke; left and right
steering levers; electric blade clutch switch; parking brake; mower
deck lift
Internal, mechanical linkage attached to the brake handle
11 x 4 - 5
8-10 psi Rear, 20-25 psi front ca ster
w/48" deck, 23x9.50 - 12
2” Steel square tube and plate, all welded construction
Milsco Adjustable seat. 5" Adjustment
One 5 gallon w/shutoff valve
Painted Steel
0-8.0 + MPH forward. 0-4.3 MPH reverse
Hour meter, Tachometer, Maintenance-minder
850 lbs. w48" deck
7
OPERATING INSTR UCTIONS
Figure. 1 Figure. 2
Electric Blade
Clutch Switch
Ignition Switch
Tach and
Hour Meter
A.General
1. When Mowing:
a. Keep adults, children, and pets away from
the area to be mowed.
b. When operating this mower, in the forward
direction, do not allow the steering levers
to return to Neutral on their own. Always
maintain a firm grip on the levers, operate
them smoothly and avoid any sudden
movements of the levers when starting and
stopping.
c. If the mower is equipped for side dis-
charge, never use the mower without the
discharge chute installed and placed in the
down position.
d. Always remove debris and other objects
from the area to be mowed (Note: debris
and loose grass will reduce traction).
e. Mow only in daylight.
f. Watch for holes, sprinkler heads, and other
hidden hazards.
g. Avoid driving to close to trees, creeks,
ditches, sand traps, and other obstacles.
h. Before backing up, check behind and
watch where you are going.
i. Always reduce speed when making a turn,
and when grass is wet.
j. Alwa ys mow across slopes, never up and
down the slope. Do not operate on steep
slopes and slow down before turning.
Avoid turning downhill if possible, start at
the bottom and work up to the top. Use
extra care and go slowly when turning
downhill.
k. Be careful when crossing gravel paths or
roadways. Always turn off the blade clutch
switch and wait until the blades stop rotat-
Engine throttle
Choke Lever
ing and raise the cutting deck to the transport positi on . Always allow other vehicles
to have the right of way.
l. If you hit a solid object while mowing, turn
off the blade clutch switch, place the steering levers in the neutral, opened-out position, move the throttle to slow, set the
parking brake, shut off the engine, and
take the key from the ignition switch.
Inspect for damage. Repair the damage.
Make sure the blades are in good condition
and that the blade bolts are tight before
restarting the engine.
m. Never lea ve the mower unattended without
observing the following: turn off the blade
clutch switch, placing the steering levers in
the neutral open-out position, moving the
throttle to slow, setting the parking brake,
shutting off the engine and taking the key
from the ignition switch.
n. Never walk or stand on the discharge side
of the mower when the engine is running.
Turn off the blade clutch switch if another
person approaches while you are operating the mower.
o. Never attempt to operate the traction unit
without having the mowing deck attached.
p. Keep the mower and especially the engine
and hydraulic components clean and free
of grease, grass, and leaves to reduce the
chance of fire and permit proper cooling.
2. Safety Awareness when Mowing
a. Do not operate on steep slopes, those
above 15 degrees (27% slope).
b. Av oid turning downhill if possible, if not use
extra care and go slowly.
8
c. Avoid turning when going downhill, traction
is at a minimum going downhill.
d. Do not operate with discharge side of the
mower toward streets, buildings, play-
grounds, parking lots, other machines, ani-
mals, and other people.
e. Avoid operation or use extreme care if the
traction surface is wet, unstable, or slip-
pery.
f. Use extra care when grass clippings,
leaves, pine needles, or debris are present
as traction can be reduced.
g. Slow-down before turning and come to a
complete stop before any zero turn maneu-
ver.
h. Do not stop machine or park machine over
combustible materials such as dry grass,
leaves, debris, etc.
3. To Mow Grass and Produce a Striped Pattern
a. Pick a point on the opposite side of the
area to be mowed (post, tree, shrub, etc.).
b. If on an hillside, start at the bottom so that
the turns are uphill rather than downhill.
c. Align the mower so as to head directly
toward the object on the far side.
d. Slowly increase the speed of the machine
to match cutting conditions, terrain, and
operator familiarity with the controls and
keep the machine headed directly toward
the alignment object. Do not go fast as to
reduce cut quality or to be uncomfortable
in controlling the speed and direction of the
machine.
e. When approaching the other end of a strip,
slow down or stop before turning. A U-turn
is recommended unless a zero turn is
required. The speed of a U-turn that will
allow for machine controllability and minimal turf defacement will be dependent on
several factors including: the speed of the
turn, the radius of the turn, the tire tread
pattern, the traction coefficient of the tire to
the traction surface, the slope of the traction surface.
f. Remember, a zero turn requires that the
forward or rev erse tra v el of the machine be
stopped prior to the initiation of the turn or
severe turf defacement can occur.
g. To prevent rutting or grooving of the turf,
change the direction that the strips are
mowed by approximately 45 degrees the
next and each subsequent time that the
area is mowed.
B.Controls
Engine Ignition and Start Switch:
1.
ure 1.) Located on the instrument housing
below the right side of the operator’s seat.
When the key is inserted and turned clockwise, 45 degrees, the ignition circuit is closed.
Turning the switch further against spring pressure starts the engine. The engine will only
start if the blade clutch switch is in the “off”
position, the parking brake is engaged and
the left and right steering levers are in the
neutral, opened-out position. The key should
always be removed from the switch if the
operator leaves the mower’s seat.
Engine Throttle Control:
2.
Located on the left side of the mower next to
the operator’s seat. Moving the throttle control
from the rear to the front will increase the
engine speed from slow to fast.
Left and Right Steering Levers:
3.
3.) These hinged levers open out to the side in
the neutral position to pe rmit the operator to
be seated or to leave the mower’s seat. The
operator, when seated, can pull the levers up
to the operating position, a comfortable forearm’s length away. These levers control all of
the movements of the mower. Pushing both
levers forward causes the mower to move forward. Pulling both levers back causes the
mower to move backward. Pushing one lever
ahead of the other lever causes the traction
wheel on the side where the lever is ahead to
rotate faster than the other traction wheel,
making the mower turn toward the side where
the lever is behind. When one lever is pushed
forward and the other lever pulled back the
same amount, one traction wheel will turn in
reverse and the mow er will turn within its own
length.
In order to start the engine, both steering
levers must be opened out to the side in the
neutral position; the parking brake must be
engaged; and the blade clutch switch must be
“off”. However, once the engine starts, the
parking brake must be released before the
operator places the steering levers into the
operating position or the engine will
automatically shut off.
Note:
neutral when released, but they should be
placed in neutral by the driver. If the Drive
Handles are not placed in neutral, the tractor
may creep.
(See Fig-
(See Figure 2.)
(See Figure
The Steering Lever will return toward
9
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