Keys Fitness Milestone 4200 User manual

Keys Fitness Treadmills
Manufactured in the USA by:
KEYS Fitness Products, LP
P.O. Box 551239
Dallas, Texas 75239
OWNER’S MANUAL
MILESTONE 4200/4400HR TREADMILL
PART# 15-0113

Table of Contents
Table of Contents 2
Specification Sheet 3
Important Safety Information 4
Before You Start 5
Warm Up Exercises 6
Assembly, Moving Instructions 7
Power Requirements 8
Console Functions and Descriptions 9, 10 & 11
Program and Operating Instructions 12,13, & 14
Program Descriptions and Profiles 15
Belt Adjustments and Tension 16
Maintenance Instructions 17
Change to MPH or Km/H 18
Troubleshooting Guide 19
Parts and Diagrams 20
Parts List 21
Warranty Registration (Mail In Form) 22
Information Page #
Page 2

MS4200 MS4400HR
♦Horsepower (Continuous) 2.0hp 2.5hp
♦Display Type (Green, with pace) 5 Window LED 5 Window LED
♦Electronics Push button Push Button
♦Pre-Set Programs 4 4
♦Custom Programs 8 8
♦User Programs 2 2
♦Heart Rate Interactive No Yes
♦Power Incline 12% 12%
♦Remote Toggle Switches Yes Yes
♦Speed/Incline Speed Bar Yes Yes
♦Roller Diameter 2.5” 2.5”
♦Cushioned Deck Yes Yes
♦Speed Range 0-10mph 0-10mph
♦Belt Size 20” x 56” 20” x 56”
♦Front Hand Rails No No
♦Side Hand Rails Yes Yes
♦Foot Print 32” x 71” 32” x 71”
♦Foot Print Folded 32” x 26” 32” x 26”
♦Warranty Motor 10 Years 10 Years
♦Warranty Parts 2 Years 2 Years
♦Warranty Labor 1 Year 1 Year
♦Warranty Frame Lifetime Lifetime
Specification Sheet
PAGE 3

Important Safety Information
1) WARNING! Before using this treadmill or starting any exercise program, consult your physician. This is
especially important for persons over the age of 35 and/or persons with pre-existing health problems. The
manufacturer or distributor assumes no responsibility for personal injury or property damage sustained by or
through the use of this product.
2) WARNING! To reduce the risk of electrical shock, burns, fire, or other possible injuries to the user, it
is important to review this manual and the following precautions before operation.
SAFETY PRECAUTIONS AND TIPS
♦It is the owner’s responsibility to ensure that all users of this treadmill have read the Owner’s Manual and
are familiar with warnings and safety precautions.
♦This treadmill has a user maximum capacity of 300 pounds.
♦The treadmill should only be used on a level surface and is intended for indoor use only. The treadmill
should not be placed in a garage, patio, or near water and should never be used while you are wet. KEYS
recommends a treadmill mat be placed under the treadmill to protect floor or carpet and for easier
cleaning.
♦Follow safety information in regards to plugging in your treadmill. Keep the power cord away from the
incline wheels and do not run the power cord underneath your treadmill. Do not operate the treadmill with
a damaged or frayed power cord.
♦Wear comfortable, good-quality walking or running shoes and appropriate clothing. Do not use the
treadmill with bare feet, sandals, socks or stockings.
♦Always straddle the belt and allow it to start moving before stepping onto the belt.
♦Hold on to handrails when adjusting speed, incline, or other controls.
♦Always examine your treadmill before using to ensure all parts are in working order.
♦Allow the belt to fully stop before dismounting.
♦Pets should never be allowed near or on the treadmill.
♦Do not leave children unsupervised near or on the treadmill.
♦Never operate the treadmill where oxygen is being administered, or where aerosol products are being
used.
♦Never insert any object or body parts into any opening.
♦For safety and to prevent damage to your treadmill, no more than one person should use the treadmill at a
time.
♦Always unplug the treadmill before cleaning and/or servicing. Service to your treadmill should only be
performed by an authorized service representative, unless authorized and/or instructed by the
manufacturer. Failure to follow these instructions will void the treadmill warranty.
♦Never leave the treadmill unattended while it is running.
PAGE 4

Thank you for purchasing a KEYS treadmill! The MS4200 and MS4400HR were designed to meet your
needs for cardiovascular exercise.
Before you start, please read the Owner’s Manual and become familiar with the operation of your new
treadmill.
♦Remember to take the time to perform the stretching exercises provided on Page 6 to avoid injury.
♦Do not stand on the walking belt while pressing the Power button or Start/Stop button.
♦Always adjust the speed of the treadmill in small increments as this treadmill is capable of high speeds.
♦If you are taking medication, consult your physician to see if the medication will affect your exercise
heart rate.
♦If you have heart problems, you are not active, and/or are over the age of 35 years, do not use the pre-set
treadmill programs or start an exercise program without first contacting and receiving approval from your
physician.
♦To avoid the risk of electrical shock, always keep the console dry. Do not spill liquids on the console.
KEYS recommends a sealed water bottle for beverages consumed while using the treadmill.
♦Please review the following picture below to familiarize yourself with the listed parts. This
manual covers several treadmills, so the one pictured below may not be identical to your particular
model.
Before You Start
PAGE 5
SAFETY LATCH
ELECTRONIC DISPLAY
CONSOLE
WATER BOTTLE HOLDER
(WATER BOTTLE NOT INCLUDED)
SIDE HAND RAILS
CIRCUIT BREAKER
UPRIGHTS
MOTOR COVER
WHEEL
REAR ROLLER
ADJUSTMENT BOLTS
FOOT RAILS
WALKING BELT

Warm Up Exercises
EXERCISE GUIDELINES
WARNING! Before beginning this or any exercise program, you should consult your physician. This is espe-
cially important for individuals over the age of 35 or individuals with pre-existing health problems.
Warming up prepares the body for the exercise by increasing circulation, supplying more oxygen to the mus-
cles and raising body temperature. Begin each workout with 5 to 10 minutes of stretching and light exercise
to warm up. The photos on this page show several forms of basic stretching you may perform before your
workouts. In order to achieve an adequate warm-up, perform each stretch three times.
TOE TOUCH STRETCH
Stand bending your knees slightly and slowly bend for-
ward from your hips. Allow your back and shoulders to
relax as you reach down toward your toes as far as pos-
sible. Hold for 15 counts, then relax. This will stretch
your hamstrings, back of knees , and back.
HAMSTRING STRETCH
Sit with one leg extended. Bring the sole of the opposite
foot toward you and rest it against the inner thigh of
your extended leg. Reach toward your toes as far as
possible. Hold for 15 counts, then relax. This will
stretch your hamstrings, lower back, and groin.
CALF/ACHILLES STRETCH
With one leg in front of the other, reach forward and
place your hands against a wall. Keep your back leg
straight and your back foot flat on the floor. Bend your
front leg, lean forward and move your hips toward the
wall. Hold for 15 counts, then relax. To cause further
stretching of the Achilles tendons, bend your back leg as
well. This will stretch your calves, Achilles tendons,
and ankles.
QUADRICEPS STRETCH
With one hand against a wall for balance, reach back
and grasp one foot with your other hand. Bring your
heel as close to your buttocks as possible. Hold for 15
counts, then relax. This will stretch your quadriceps
and hip muscles.
INNER THIGH STRETCH
Sit with the soles of your feet together and your knees
outward. Pull your feet toward your groin area as far as
possible. Hold for 15 counts, then relax. This will
stretch your quadriceps and hip muscles.
PAGE 6

The MS4200 and MS4400HR are shipped in two pieces, please see assembly instructions below. After
opening the box, remove any packing materials from the treadmill. Do not throw away any packing
materials until the unit is working properly. Place the base on a clean, level surface. Make sure the
electrical cord will easily reach an electrical outlet.
Assembly
See Figure 1
To attach End cap:
1. Place plastic end cap over exposed rear roller area.
2. Align holes in plastic end cap with pre-drilled holes in frame.
3. Loosely tighten each screw until all four screws are lined up.
4. Tighten all four screws snugly.
Moving
See Figure 2
CAUTION! TO AVOID THE RISK OF INJURY, NEVER ATTEMPT TO MOVE THE TREADMILL WHILE IT IS IN THE
UNFOLDED OPERATING POSITON. TO REDUCE THE POSSIBILITY OF INJURY WHILE LIFTING, BEND YOUR
LEGS AND KEEP YOUR BACK STRAIGHT. AS YOU RAISE THE TREADMILL, LIFT USING YOUR LEGS, NOT
YOUR BACK. IN ORDER TO RAISE OR LOWER THE TREADMILL SAFELY, YOU MUST BE ABLE TO LIFT 45
POUNDS (20KG). IT IS SUGGESTED YOU ALWAYS USE THE AID OF A SECOND PERSON WHEN MOVING THE
TREADMILL.
With the treadmill in the folded locked position (safety latch is engaged), grasp the handrails and place one foot on the base as
shown in the photo below. Next, with a firm grasp on handrails, place one foot on the center of the base crossbar and carefully
tilt the treadmill back until it rolls freely on the wheels. Using extreme caution, move the treadmill to the desired location. To
set the treadmill down, place one foot on the center of the base crossbar and carefully lower treadmill onto base in resting
position. Do not attempt to move the treadmill over an uneven or rough surface.
Assembly, Moving Instructions
PAGE 7
Figure 2
Figure 1

NG!
IMPROPER CONNECTION OF THE EQUIPMENT GROUNDING CONNECTOR CAN RESULT IN A
RISK OF AN ELECTRIC SHOCK. CHECK WITH A QUALIFIED ELECTRICIAN OR SERVICE MAN
IF YOU ARE IN DOUBT AS TO WHETHER THE PRODUCT IS PROPERLY GROUNDED. DO NOT
MODIFY THE PLUG PROVIDED WITH THE PRODUCT, IF IT WILL NOT FIT THE OUTLET, HAVE
A PROPER OUTLET INSTALLED BY A QUALIFIED ELECTRICIAN.
This treadmill can be seriously damaged by sudden voltage changes in your home’s electrical power.
Voltage spikes, surges, and noise interference can result from weather conditions or from other appliances
being turned on or off. To reduce the possibility of treadmill damage, always use a surge protector (not
included) with your treadmill.
Surge protectors can be purchased at most hardware stores. The manufacturer recommends a single outlet
surge protector with a UL 1449 rating as a Transient Voltage Surge Suppressor (TVSS) with a UL
suppressed voltage rating of 400V or less and an electrical rating of 120VAC, 15 amps.
This treadmill must be grounded to reduce the risk of electrical shock. Grounding provides a path of least
resistance for electric current, should the treadmill malfunction. This treadmill comes with an electrical
cord having an equipment-grounding conductor and a grounding plug. Always plug the power cord into a
surge protector, and plug the surge protector into an appropriate outlet that is properly installed and
grounded in accordance with all local codes and ordinances.
This product is for use on a nominal 120-volt circuit and has a grounding plug that looks like the plug
illustrated in the drawing below.
Power Requirements
PAGE 8

Console Functions and Descriptions
POWER - Press to on. Allow
6-8 seconds while the
electronics perform a self
check prior to pressing other
buttons.
START/STOP - This button
starts the treadmill belt
moving. There is a 4 second
countdown built in as a safety
feature to let you know the
treadmill belt is about to start
moving.
Use the START/STOP button
also to stop your treadmill
after your workout. The belt
will gradually come to a stop
after pressing the button.
PAUSE - Press to
temporarily pause
your workout
while in use. The
treadmill is
designed with an
automatic power
off feature after 5
minutes in the
pause mode.
SPEED - Use to either
increase (UP arrow) or
decrease (DOWN arrow)
the speed. These buttons
are also used while
programming SPEED and
TIME.
INCLINE - Use to either
increase (UP arrow) or
decrease (DOWN arrow)
the incline. These buttons
are also used while
programming INCLINE.
ONE TOUCH SPEED BAR -
Use to either increase or
decrease the speed. Each
number indicates MPH.
Pressing one of the buttons will
gradually increase or decrease
the speed to the new setting.
ONE TOUCH INCLINE
BAR - Use to either increase or
decrease the incline. Each
number indicates percent of
grade. Pressing one of the
buttons will gradually increase
or decrease the incline to the
new setting.
PROGRAM BUTTONS - These buttons are used to
access each of the three programs: Fat Burn, Cardio,
and Warm Up. Each program has one preset program,
and two additional custom programs in the P1 and P2
mode. See the “Program and Operating Instructions” on
page 12.
ENTER - Use
the Enter button
while setting
program time,
speed, and
incline options.
See page 12 for
complete
instructions.
PAGE 9
MS4200

Console Functions and Descriptions
POWER - Press to on. Allow
6-8 seconds while the
electronics perform a self
check prior to pressing other
buttons.
START/STOP - This button
starts the treadmill belt
moving. There is a 4 second
countdown built in as a safety
feature to let you know the
treadmill belt is about to start
moving.
Use the START/STOP button
also to stop your treadmill
after your workout. The belt
will gradually come to a stop
after pressing the button.
PAUSE - Press to
temporarily pause
your workout
while in use. The
treadmill is
designed with an
automatic power
off feature after 5
minutes in the
pause mode.
SPEED - Use to either
increase (UP arrow) or
decrease (DOWN arrow)
the speed. These buttons
are also used while
programming SPEED and
TIME.
INCLINE - Use to either
increase (UP arrow) or
decrease (DOWN arrow)
the incline. These buttons
are also used while
programming INCLINE.
ONE TOUCH SPEED BAR -
Use to either increase or
decrease the speed. Each
number indicates MPH.
Pressing one of the buttons will
gradually increase or decrease
the speed to the new setting.
ONE TOUCH INCLINE
BAR - Use to either increase or
decrease the incline. Each
number indicates percent of
grade. Pressing one of the
buttons will gradually increase
or decrease the incline to the
new setting.
PROGRAM BUTTONS - These buttons are used to
access each of the three programs: Fat Burn, Cardio,
and Warm Up. Each program has one preset program,
and two additional custom programs in the P1 and P2
mode. See the “Program and Operating Instructions” on
page 12.
ENTER - Use
the Enter button
while setting
program time,
speed, and
incline options.
See page 12 for
complete
instructions.
PAGE 10
MS4400HR

There are five display windows on the control panel to provide feedback information.
TIME WINDOW
♦TIME: Indicates elapsed time after pressing start in minutes and seconds (0-99 minutes, 0-59 seconds)
♦INTERVAL TIME: Indicates countdown in seconds to the next interval starting at 5 seconds and
counting to 0 seconds.
♦PACE: Indicates amount of time required to complete 1 mile at current speed.
♦SPEED WINDOW
♦SPEED: Indicates MPH (miles per hour) or KMH (kilometer per hour) in .1 increments
♦DISTANCE / CALORIES WINDOW
♦DISTANCE: Indicates Miles or Kilometers traveled in .01 increments up to 9.99 and .1 increments
starting at 10.0
♦CALORIES: Indicates estimated calories used based on 150 lb. person at the indicated speed, incline,
and time
♦INCLINE WINDOW
♦INCLINE: Indicates incline in percent of grade 0-12% in 1 increments
♦PULSE ( MS4400HR Model Only): Indicates current heart rate
♦HEART “♥”(MS4400HR Model only): Indicates control panel is receiving a signal from heart rate
transmitter. Heart will blink on and off if receiving signal from Heart Rate Transmitter chest strap.
♦CENTER BRICKYARD WINDOW
♦Displays quarter mile track in Manual mode. Indicates position on track by a blink. In program mode,
shows the change in speed profile across the interval range (1-10) and shows position with a blinking
action.
The LAP counter will appear in manual mode in the center of the window.
♦SPEED & INCLINE “ONE-TOUCH” BUTTONS
♦Easy One-Touch buttons for Speed and Incline have been added to the console. To increase or decrease the speed, simply
choose the desired setting (each number 2 through 8 represents Miles per Hour). To increase or decrease the amount of
incline, simply choose the desired setting (each number 2 through 8 represents percent grade).
Console Functions and Descriptions
PAGE 11

QUICK START / MANUAL MODE
♦Plug into a standard wall outlet (110-Volt AC, 15-amp circuit).
♦Insert the Safety Key into the treadmill console.
♦Stand on the treadmill and straddle belt.
♦Press POWER button. There will be an eight (8) second delay after pressing the POWER button before
data can be entered. The TIME window will flash.
♦Press START/STOP button. Belt will begin to move after 4 seconds. Step on belt slowly after the belt
starts moving. Speed or incline may be adjusted by using the appropriate + (increase) or – (decrease)
buttons.
♦To end your workout, press START/STOP button. Belt will gradually slow to zero.
♦To pause your workout, press PAUSE.
♦To re-start after pausing: Press the PAUSE button. WARNING: The treadmill belt will resume at the
speed the treadmill was moving before pausing.
♦Countdown Time, Preset Speed and/or Incline: Time, Speed, and Incline may be preset prior to
getting started. After pressing the POWER button, the WORKOUT time window will blink. Use the
SPEED/TIME + or – arrows to select your workout time, then press the ENTER PROGRAM button.
The SPEED window will now be flashing. Using the same + or – arrows, select the speed for your
workout, then press ENTER PROGRAM. Now the INCLINE window will be flashing. Use the
INCLINE + or – arrows to set your workout incline, then press ENTER PROGRAM. To start, press the
START/STOP button.
Program and Operating Instructions
PAGE 12

PROGRAM MODE
♦Plug into a standard wall outlet (110-Volt AC, 15-amp circuit). Insert the Safety Key into the treadmill
console.
♦Stand on the treadmill and straddle belt.
♦Press POWER button. There will be an eight (8) second delay after pressing the POWER button before
data can be entered. The TIME window will flash.
♦There are four (4) pre-set programs on the MS4200 and MS4400HR. Programs include Fat Burn,
Cardio, Warm Up, and Cross Training programs. The MS4400HR also includes a Heart Rate Interactive
program (see the program profiles later in this manual). Select the program by pressing the appropriate
button.
♦Press START/STOP button. Belt will begin to move after 4 seconds. Step on belt slowly after the belt
starts moving.
♦Each of the pre-set programs can also be customized. Follow the instructions below.
♦Customizing programs in P1 and P2 Mode: Each pre-set program can be customized in the P1 or P2
mode. After making the program selection, the CALORIE/DISTANCE window will read “OP.” “OP”
refers to “original program” and is preset. The program name you select will display in the diode light
beside the program name. Press the same program button once more, and the CALORIE/DISTANCE
window will read P1. The “P1” mode is now accessed. You can now program the Time, Speed, and
Incline in P1 mode, which will save your entered information for future use. The WORKOUT time
window will blink. Use the SPEED/TIME + or – arrows to select your workout time, then press the
ENTER PROGRAM button. The SPEED window will now be flashing. Using the same + or – arrows,
select the speed for your workout, then press ENTER PROGRAM. Now the INCLINE window will be
flashing. Use the INCLINE + or – arrows to set your workout incline, then press ENTER PROGRAM.
To start, press the START/STOP button. To access P2 mode, press the selected program button three
times (once for OP, twice for P1, three times for P2). Follow the above procedure to customize.
♦TO CHANGE A PREVIOUSLY PROGRAMMED P1, P2, or user program: Once you have
programmed the P1 or P2 modes, you will need to use the PAUSE button to change the program you
previously entered. For instance, if P1 in Fat Burn has been programmed, to change to a new setting,
press the Fat Burn button twice to access P1. Then press the PAUSE button to get the WORKOUT time
window to flash. Follow the directions above to continue to change the program.
Program and Operating Instructions
PAGE 13

Program and Operating Instructions
Heart Rate Control Instructions (MS4400HR)
HEART RATE PROGRAM MODE
The Heart Rate program is designed to keep your heart rate a desired level of “beats per minute” by
automatically adjusting the incline. For example, if you have programmed in a desired heart rate of 105
beats per minute and your heart rate is only 95 beats per minute (you must be wearing Heart Rate
Transmitter), the incline will automatically increase to intensify the work load, and increase you heart rate
to the 105 beats per minute you programmed.
If your heart rate is above your programmed amount of beats per minute the incline will automatically
decrease to lower your heart rate. You may at any time during the Heart Rate Program adjust/override the
speed and or incline by simply pressing the correct corresponding buttons. You may change your “Target
Heart Rate” at any time during the program by pressing the TARGET + or TARGET – buttons.
♦Plug into a standard wall outlet (110-Volt AC, 15-amp circuit). Insert the Safety Key into the treadmill
console
♦Place the Heart Rate transmitter strap across chest against the skin. Stand on the treadmill and straddle
belt.
♦Press POWER button. There will be an eight (8) second delay after pressing the POWER button before
data can be entered. The WORKOUT time window will flash. The “Heart” shape on the treadmill will
be flashing if the Heart Rate Transmitter is transmitting. Adjust the strap on the chest until the console
is picking up a signal.
♦For Quick Start, press START/STOP button. Belt will begin to move after 4 seconds. Step on belt
slowly after the belt starts moving. Speed or incline may be adjusted by using the appropriate +
(increase) or – (decrease) buttons. Heart rate will read out in the Incline window.
♦To select the Heart Rate Control program, press the “Heart Rate Control” button.
♦The incline window will flash “125”, which is the default program target heart rate.
♦Adjust Target Heart Rate to desired level with the TARGET + or – buttons.
♦Press START/STOP button, or continue instructions below to program Time and Speed.
♦You can now program the Time and Speed. The WORKOUT time window will blink. Use the SPEED/
TIME + or – arrows to select your workout time, then press the ENTER PROGRAM button. The
SPEED window will now be flashing. Using the same + or – arrows, select the maximum speed for
your workout, then press ENTER PROGRAM. To start, press the START/STOP button.
PAGE 14

12
11
10
9
8
7
6
5
4
3
2
1
Program Profiles
1 2 3 4 5 6 7 8 9 10
SPEED
INCLINE
The Fat Burn Program is designed
to vary the treadmill elevation, while
maintaining a constant walking belt
speed.
12
11
10
9
8
7
6
5
4
3
2
1
1 2 3 4 5 6 7 8 9 10
SPEED
INCLINE
The Cardio Program is designed to
vary the treadmill Speed, while
maintaining a constant Elevation.
12
11
10
9
8
7
6
5
4
3
2
1
1 2 3 4 5 6 7 8 9 10
SPEED
INCLINE
The Warm Up Program is designed to
gradually increase the treadmill Speed and
Elevation in the first segment (warm up)
and gradually decrease the treadmill Speed
and Elevation in the last segment (cool
down). This is also known as a Plateau
program.
PAGE 15
1 2 3 4 5 6 7 8 9 10
12
11
10
9
8
7
6
5
4
3
2
1
SPEED
INCLINE
The Cross Training Program is designed to
control the walking belt speed and elevation
inversely in alternating segments.

WARNING! Do not overtighten rollers! This will cause premature
roller bearing failure!
Belt adjustment and tension performs two functions: adjustment for
tension and centering. Your new treadmill comes pre-adjusted from
the factory for tension and centering. Please follow the procedures
below if the belt shifts to the left or right or while walking:
WALKING BELT IS SHIFTING TO THE LEFT (Diagram 1)
First, turn treadmill on to run at 1 mph. Using the hex key provided,
turn the left rear roller adjustment bolt ¼ turn in the clockwise
direction. Next, run the treadmill at 2.5 mph. You should see the
belt start to correct itself, moving back towards the center. Repeat the
above procedure until the walking belt is centered. It may be necessary
to set walking belt tension once you have completed this procedure if
the belt feels like it is slipping while walking. Refer below to the
“Walking Belt Slipping” instructions.
WALKING BELT IS SHIFTING TO THE RIGHT (Diagram 2)
First, turn the treadmill on to run at 1 mph. Using the hex key
provided, turn the right rear roller adjustment bolt ¼ turn in the
clockwise direction. Next, run the treadmill at 2.5 mph. You should
see the belt start to correct itself, moving back towards the center.
Repeat the above procedure until the walking belt is centered. It may
be necessary to set walking belt tension once you have completed this
procedure if the belt feels like it is slipping while walking. Refer
below to the “Walking Belt Slipping” instructions.
WALKING BELT IS SLIPPING DURING USE (Diagram 3)
First, unplug the power cord from the surge protector. Using the hex
key provided, turn both left and right rear roller adjustment bolts the
same distance, usually a ¼ turn in the clockwise direction. Plug the
power cord back into the surge protector and run the treadmill at 2.5
mph. You should now walk on the belt to determine if the belt is still
slipping. Repeat the above procedure until the walking belt is not
slipping. The tension should be just tight enough not to slip.
♦Turning the hex key counter clockwise brings the rear rollers and
belt towards you. Turning the hex key clockwise pushes the rear
roller and belt away form you.
PAGE 16
Belt Adjustment and Tension

WARNING! Before performing any maintenance to your treadmill, always unplug the power cord from the
surge protector.
CLEANING
Routine cleaning of your Keys Fitness treadmill will extend the life of your treadmill. WARNING! To
prevent electrical shock, be sure the power to the treadmill is OFF and the unit unplugged from the wall
electrical outlet before attempting any cleaning or maintenance.
AFTER EACH WORKOUT: Wipe off the console and other treadmill surfaces with a clean, water
dampened soft cloth to remove excess perspiration. USE NO CHEMICALS.
WEEKLY: Use of a treadmill mat is recommended for ease of cleaning. Dirt from your shoes contacts the
belt and eventually makes it to underneath the treadmill. Vacuum underneath treadmill once a week.
DECK LUBRICATION
The walking belt has been pre-lubricated at the factory. However, it is recommended that the walking board
be checked periodically for lubrication to ensure optimal treadmill performance.
Every 30 days or 30 hours of operation, lift the sides of the walking belt and feel the top surface of the
walking board as far under as you can reach. If you feel signs of silicone, no further lubrication is required.
If it feels dry to the touch, follow the instructions below.
KEYS recommends “Lube N Walk” for cleaning and lubricating the treadmill belt and deck. Ask your re-
tailer or call KEYS at 800-340-0482. You may also use silicone such as “Napa 8300” (available at most
stores).
TO APPLY LUBRICANT TO THE WALKING BOARD
1) Position the walking belt so that the seam is located on top and in the center of the center of the walking
board.
2) Insert the spray nozzle into the spray head of the lubricant can.
3) While lifting the side of the walking belt, position the spray nozzle between the walking belt and the
board approximately 6” from the front of the treadmill. Apply the silicone spray to the walking board,
moving from the front of the treadmill to the rear. Repeat this on the other side of the belt. Spray
approximately 4 seconds on each side.
4) Allow the silicone to ‘set’ for one minute before using the treadmill.
WARNING: Do not overlubricate the walking board. Excess lubricant should be wiped off with a clean towel.
Maintenance Instructions
Page 17

Your treadmill will operate in British Units (miles per hour) or International Units (kilometers per hour). All treadmills
are calibrated at the factory for British Units (miles per hour). To change the display to read in kilometers, follow the
steps described here:
1) Turn power OFF on the console. (Do not unplug treadmill) Attach the magnet safety key to the console.
2) Activate the calibration mode switch by inserting the eraser end of a pencil into the opening in the backside of the
console (see diagram below).
3) Depressing the calibration mode switch ONCE; CL11 should appear in the TIME window.
4) Pressing the SPEED +/- button will activate your choice.
5) To accept the setting, press the POWER button.
Change Miles per hour to Kilometers per
Page 18

Treadmill will not start.
1) Is the Safety Key inserted into the Treadmill Console?
2) Make sure the power cord is plugged into a surge protector, the surge protector is plugged into a
properly grounded outlet, and the surge protector is turned on. (Refer to “Power Requirements” on
page 8)
3) Check the circuit breaker located on the front of the treadmill. If the switch protrudes, it has tripped.
Wait five minutes and then press the switch back in.
4) Check the house electrical breaker box and the circuit breaker for the room the treadmill is located in.
If it has tripped, reset or have an electrician replace the breaker in home.
5) Have an electrician check for inadequate voltage at the outlet.
Treadmill losses power during use.
1) Check the circuit breaker located on the front of the treadmill. If the switch protrudes, it has tripped.
Wait five minutes and then press the switch back in.
2) Check the house electrical breaker box and the circuit breaker for the room the treadmill is located in.
If it has tripped, reset or have an electrician replace the breaker in home.
3) If treadmill still will not operate, please call Keys Technical Service at [phone].
Treadmill walking belt slows during use.
1) Check to make sure the treadmill is securely plugged into an UL-listed surge protector, rated at 15
amps, with a 14-gauge cord of five feet or less and the surge protector is securely plugged into the
outlet.
2) If treadmill still will not operate, please call Keys Technical Service at [phone].
Treadmill walking belt slips or is not centered on rear roller.
1) Refer to “Belt Adjustment and Tension” section on page 14.
2) Need help? Call Keys Technical Service at [phone].
Treadmill Error Messages.
Your treadmill is equipped with a software package that enables error messages to be displayed when
there is a problem. To avoid possible damage to the treadmill and the possibility of injury, do not
operate the treadmill until the problem is corrected. Call Keys Technical Service at [phone].
Page 19
Troubleshooting Guide

Page 20
Parts & Diagrams
MS4200 MS4400HR MS4200 MS4400HR
1 Left Side Extrusion Rail 05-0033 05-0033 12 Poly V Belt 04-0004 04-0004
2 Right Side Extrusion Rail 05-0033 05-0033 13 Motor Hood Cover 06-0147 06-0147
3 Treadmill Belt 04-0019 04-0019 14 Console Assembly 24-0178 06-0124
4 Front Roller Assembly 24-0176 24-0176 15 Controller 08-0115 08-0115
5 Rear Roller 09-0020 09-0020
6 Treadmill Deck 03-0014 03-0014
7 End Cap 06-0164 06-0164
8 Elevation Motor (actuator) 12-0022 12-0022
9 Bottom Motor Pan 06-0148 06-0148
10 Motor Fan 06-0079 06-0079
11 Motor 12-0018 12-0018