Precor 904 User manual

Total Body
Treadmill
R
USA
Owner’s Manual
Assembly and Operation

page 2
Total Body
Treadmill
Thank you for purchasing one of the innovative additions to the famous
Precor treadmill line: the 904 Total Body Treadmill. Smooth, manual operation
and dual-action handrails provide a safe and effective cardiovascular and “total
body” workout.
Before using the 904 Total Body Treadmill, we urge you to familiarize yourself
with the entire Owner’s Manual. Whether you are a beginner or exercise on
treadmills regularly, understanding this manual will help you use the 904
treadmill safely and successfully.
Safety Information
Please review and observe the following safety guidelines:
• Read the Owner’s Manual and follow all instructions.
• Assemble and operate the 904 treadmill on a solid, level surface. A low-
pile carpet is best. If the treadmill is placed on a hardwood floor or a deep-
pile carpet, place a piece of heavy cardboard, plywood, or other flat
surface under the unit to protect the floor or carpet. Locate the treadmill a
few feet from walls or furniture. Keep the area behind the treadmill clear.
• Do not allow children on or near the 904 treadmill. Do not leave children
unsupervised around the treadmill.
• Check the 904 treadmill before each use. Be sure all assembly bolts are
tightened and secure. Do not use the treadmill if it is not completely
assembled or is damaged in any way.
• Keep hands away from the flywheel and other moving parts.
• Wear proper exercise clothing and shoes for your workout—no loose
clothing. Do not wear shoes with heels or leather soles. Check the soles of
your shoes and remove any embedded stones. Tie long hair back.
• Use care when getting on or off the 904 treadmill. If you are unfamiliar
with the use of the treadmill, secure the handrails into an upright position
by inserting the locking pins in place prior to walking or running on the
treadmill. Refer to the Assembly Instructions .
• Keep your body and head facing forward. Do not attempt to turn around
on the treadmill when the belt is moving.
• Do not rock the unit. Do not stand or climb on the handrails. Never place
liquids on any part of the treadmill.
• Do not overexert yourself or work to exhaustion.
• Stop your workout immediately if you feel any pain or abnormal
symptoms, and consult your physician.
Precor manual treadmills are designed for the enjoyment of the dedicated
walker and runner. By following the above precautions and using good
common sense, you will have many safe and pleasurable hours of healthful
exercise with your Precor treadmill.
R
USA
CAUTION: Before beginning
any fitness program, you
should have a complete
physical examination by your
physician.

page 3
Table of Contents
Safety Information ...................................................................................... 2
Unpacking the 904 Total Body Treadmill.................................................... 4
Tips for Unpacking the Treadmill......................................................... 5
904 Hardware Kit................................................................................. 6
Assembling the 904 Total Body Treadmill................................................. 7
Installation Requirements.................................................................... 7
Assembly Instructions......................................................................... 8
Adjusting the Elevation Tube ............................................................... 13
Checking the Alignment of the Running Belt ....................................... 15
Using the Precor 904 Total Body Treadmill. .............................................. 16
Beginning Your Workout ..................................................................... 16
Ending Your Workout .......................................................................... 16
Working Out on the 904 Treadmill....................................................... 17
Using the Handrails ............................................................................. 18
Adjusting the Handrail Resistance ....................................................... 19
Using the Micro-Adjustment Knob ...................................................... 20
General Aerobic Training Information ....................................................... 21
How Hard Should I Exercise? .............................................................. 22
How Long Should I Exercise?.............................................................. 23
How Often Should I Exercise? ............................................................. 23
Maintaining the 904 Total Body Treadmill ................................................ 24
Cleaning the Treadmill ......................................................................... 24
Storing the Treadmill ........................................................................... 24
Aligning the Running Belt .................................................................... 25
Lubricating the Running Belt ............................................................... 27
Obtaining Service ................................................................................ 27

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Unpacking the 904 Total Body Treadmill
All Precor products are thoroughly tested and inspected before shipment.
Precor ships the 904 treadmill in seven pieces:
• Deck or treadmill’s base assembly
• Handrails (right and left)
• Front lift bar
• T-knob assembly
• Literature kit (not shown) and Hardware kit (contents shown in Diagram 2)
Diagram 1 shows the treadmill’s parts after opening the carton. Callouts point
to the different parts of the treadmill that are discussed in the assembly
instructions. Unpack the treadmill close to the location where you plan to use it.
Note: Save the triangular, cardboard end block for use in the assembly.
Right handrail mount
Diagram 1
Unassembled 904 treadmill.
Handrail (right)
Front lift bar
Running belt
Micro-adjustment cable
Flywheel
Side rail
Handrail (left)
Cardboard end block
T-knob assembly

page 5
Tips for unpacking the treadmill:
• Ask for assistance to help you unpack the treadmill. Place the carton close
to the location where you plan to assemble and use the treadmill.
• To avoid scratching yourself or the unit, remove the staples when you
open the carton. Let the sides of the carton fall flat onto the floor.
• Take the
left handrail off the running belt and set it aside. See Diagram 1.
• To access the front lift bar and its cardboard packing, carefully lift the
black foam section of the right handrail (since its base is attached to the
treadmill by a cable). Remove the front lift bar and set it aside. Leave the
right handrail on top of the running belt.
• Remove the T-knob assembly by lifting the unsecured T-knob and sliding
the opposite end out of the cardboard slot.
• Have your assistant hold onto the side rails at the rear of the treadmill to
lift the deck while you pull the triangular, cardboard end block away from
the rear roller. Set the triangular, cardboard end block aside to use in
step 2 of the assembly instructions.
• Use a paper towel or a clean cloth to wipe off the excess lubricant on the
running belt and deck. Do not wipe off any lubricant that is between the
belt and the deck.
CAUTION: The right handrail is
attached to the deck assembly
by the micro-adjustment
cable. Be sure to leave the
right handrail on top of the
running belt.
CAUTION: Avoid injury by
placing your hands on the side
rails when lifting the rear of
the treadmill. Do not use the
rear roller to lift the treadmill.

page 6
Diagram 2
904 Hardware kit.
A
B
C
D
E
Open the hardware kit and make sure that you have the following items. See
Diagram 2. As you identify the contents of the kit, check them off below.
(A) two safety stops—front lift bar installation
(B) two bolts—front lift bar installation
(C) two washers—front lift bar installation
(D) two locking pins—handrail installation
(E) one 1/4" hex key—treadmill assembly and belt adjustment
If any items are missing, contact your authorized Precor dealer. For the dealer
nearest you, call 1-800-4-PRECOR.
CAUTION: After assembling
the treadmill, place the hex
key in a safe and secure place.
If the running belt should
move off-center, you can use
the 1/4" hex key to align it.

page 7
Assembling the 904 Total Body Treadmill
Follow the instructions in this section to assemble the 904 Total Body
Treadmill. It is important to read through the entire procedure before assem-
bling your treadmill. If you do not assemble and use this treadmill according to
the following guidelines, you could void the Precor limited warranty.
Installation Requirements
Follow these installation requirements when installing the treadmill:
•Fill out and mail the limited warranty registration card. The serial
number is written on a label underneath the treadmill on the side beam.
During the assembly process, write the serial number on the limited
warranty card and in this Owner’s Manual (see Obtaining Service ). If you
want a 904 Technical Service Manual, write to:
ATTN: 904 Technical Service Manual
Precor Customer Service Department
P.O. Box 3004
Bothell, WA 98041-3004
•Set up the 904 treadmill on a solid, flat surface.We recommend placing
the treadmill on a low-pile carpet. Do not install the treadmill on hardwood
floors because the wheels might scratch or damage the surface. If the
treadmill is placed on a hardwood floor or a deep-pile carpet, place a piece
of heavy cardboard, plywood, or other flat surface under the unit to
protect the floor or carpet. If the floor is not flat and even, the running belt
may not track properly.
•Locate the treadmill at least 2 feet from walls and furniture.Open space
to the front, sides, and rear of the machine make for a safer mount and
dismount and easier belt adjustment.

page 8
Assembly Instructions
To assist you in the assembly of the 904 treadmill, the items in the hardware
kit, shown in Diagram 2 on page 6, correspond to a particular letter of the
alphabet. These letters appear in the assembly instructions. If necessary, refer
to Diagram 2 while performing the steps below.
To assemble the 904 treadmill, take the following steps:
1. Wipe Excess Lubricant Off the Deck. The area between the treadmill’s
running belt and deck is lubricated at the factory. During shipment, the
lubricant tends to migrate toward the rear of the treadmill. Use paper
towels or a clean cloth to wipe the excess lubricant off the deck and
running belt before assembling the treadmill. Do not remove any lubricant
between the running belt and deck.
CAUTION: The lubricant may
stain certain types of fabrics.
Keep the lubricant away from
your clothes. Do not use the
treadmill until you have wiped
off the excess lubricant.
2. Install the Front Lift Bar Assembly.(Diagrams 3 and 4) With the treadmill
base flat on the floor near the location where you plan to use it, take the
following steps to install the front lift bar:
a. Place the triangular, cardboard end block, set aside when you
unpacked the treadmill, under the running belt and deck so that it
supports the front end of the unit and lifts the flywheel off of the
floor. See Diagram 3.
b. Remove the two bolts and washers from inside the front lift bar
bracket and set them aside.
c. Slide the front lift bar brackets into the side rail mounts and align the
lower bolt holes.
Note: You may need to ask for assistance to help you lift the front of
the treadmill to properly align the front lift bar brackets with the side
rail mounts.
Diagram 3
Preparing to install the front lift bar.
Flywheel
Running belt
Triangular, cardboard end block
Elevation tube
Deck
Front lift bar bracket
Side rail mount
Lower bolt hole
Right handrail
CAUTION: To avoid injury,
place each hand on opposite
sides of the side rails and lift
the front of the treadmill. Do
not lift the treadmill by holding
onto the running belt or front
roller.

page 9
d. Replace the two bolts and washers (set aside in step 2b.). Make sure
that a washer is on each bolt. Insert a bolt—one on either side of the
treadmill—through the lower bolt hole. Note that the head of the bolt
should appear on the “outside” portion of the side rail. See Diagram 4.
Tighten the bolts using your fingers. Do not use the hex key (E) at this
time.
e. Remove the safety stops (A), bolts (B), and washers (C) from the
hardware kit.
f. Assemble the safety stops by placing a washer on each bolt. Insert a
bolt through each safety stop.
g. Position the safety stop so that the metal spacer on the end of the
safety stop will be against the side rail. Insert a safety stop—one on
either side of the treadmill—into the side rail’s upper bolt hole as
shown in Diagram 4 and finger-tighten.
h. Securely tighten both the upper and lower mounting bolts into the
side rails using the hex key (E) provided.
i. Remove the triangular, cardboard end block from under the front of
the treadmill.
Flywheel
Elevation tube
Locking portion of pin
Running belt
Safety stop
Front lift bar
Bolt and washer
Height adjustment pin
Side rail
Diagram 4
Installing the Front Lift Bar assembly.
CAUTION: Avoid damaging the
handrails by placing the metal
spacer, attached to the safety
stop, against the side rail.

page 10
Diagram 5
Removing hardware from the T-knob
assembly.
Flat washer
Rod
Thrust bearing
Leather pads
Flat washer
T-knob
3. Prepare the T-knob Assembly for Installation.(Diagram 5) Remove one
T-knob and its 2 flat washers and 1 thrust bearing (looks like a washer
with ball bearings) from one side of the rod. Take both leather pads off the
rod as shown in Diagram 5.
Diagram 6
Sliding the rod through the right
handrail mount.
Rod
Side rail mount
Right handrail mount
Right handrail
Smooth side of leather pad
4. Install the Handrails.(Diagrams 6, 7, and 8) Move to the right side of the
treadmill to install the right handrail. The right handrail has the micro-
adjustment cable running through it. See Diagram 6. Take the following
steps to mount the handrails:
a. Have your assistant turn the handrail so that the mounting holes on
the handrail align with the side rail mounts. Slide the rod through the
right
handrail mount. See Diagram 6.
b. Pick up a leather pad. Notice that one side is smooth and the other
side is rough. Place the pad onto the rod so that the smooth side
faces the handrail mount. Slide the leather pad up against the
handrail mount.
CAUTION: Make sure that the
micro-adjustment cable does
not loop around the rod or get
pinched between the handrail
mount and the side rail.

page 11
c. Insert the rod into the side rail mount and apply pressure to push the
T-knob assembly through to the opposite side. See Diagram 7. You
may need to jiggle the rod slightly to help alleviate friction and to
align the rod in the opposite side rail mount.
Note: Take your time and be patient while installing the rod between
the two handrails. The tight fit assures smooth handrail operation.
d. Rest the right handrail on the safety stop.
Diagram 7
Installing the right handrail and
T-knob assembly.
T-knob
Handrail (right)
Micro-adjustment cable
Rod
Handrail mount
Leather pad
Side rail mount
Safety stop
e. Remove the locking pin (D) from the hardware kit and place the wire
loop over the T-knob. Align the hole in the handrail mount with the
side rail mount and insert the locking pin. See Diagram 8.
Diagram 8
Inserting the locking pin.
T-knob
Running belt
Locking pin
Side rail mount
Handrail mount
Wire loop

page 12
f. Move to the opposite side of the treadmill to install the left handrail.
Place the remaining leather pad (rough side facing the side rail
mount) onto the rod and slide the handrail mount onto the rod. See
Diagram 9.
g. Make sure that the 2 washers and 1 thrust bearing are on the T-knob
that you set aside in step 3. To assure proper operation, the thrust
bearing (the one that looks like a washer with ball bearings in it)
must be between the two flat washers. See Diagram 9. Insert the
T-knob and washers into the end of the rod and turn the T-knob so
that it screws into the rod.
Important: If the thrust bearing is not placed between the two flat
washers, the handrail resistance will loosen rapidly during a workout.
With the thrust bearing in its proper position, the resistance between
the T-knobs remains balanced and the handrails maintain a smooth
operation.
Diagram 9
Installing the left handrail and
securing the T-knob assembly.
Side rail mount
Rod
Leather pad
Left handrail mount
Handrail
T-Knob
Flat washer
Flat washer
Thrust bearing
CAUTION: To provide the
appropriate amount of friction,
the rough side of the leather
pad must be against the side
rail mount.
Diagram 10
Securing the handrails.
Left handrail
Locking pin
Wire loop
Handrail mount
Safety stop
h. Rest the left handrail on the safety stop. See Diagram 10. Continue
tightening the T-knob until you feel an appropriate amount of
resistance when you move the handrail back and forth.
i. Take the remaining locking pin (D) from the hardware kit and place
the wire loop over the T-knob. Align the locking pin hole in the
handrail mount with the side rail and insert the locking pin. See
Diagram 10.

page 13
j. Securely tighten the T-knob by turning it clockwise. Alternately
tighten the T-knobs until both are tight against the side rails.
5. Adjust the incline of the treadmill and set the running belt to the proper
resistance level by following the steps in
Adjusting the Elevation Tube .
Adjusting the Elevation Tube
The height of the elevation tube is adjusted at the factory. The height adjust-
ment pin is placed at the middle setting (Setting #3—See Table 1). To receive
optimal performance, you may need to reposition the height adjustment pin by
taking the following steps:
1. Determine the proper Elevation Tube Setting. (Table 1) The elevation
tube has six different settings. Each setting provides a different level of
resistance needed (dependent on your weight) to maintain an efficient
workout. To get optimal performance from your treadmill, refer to the
settings shown in Table 1.
To determine if you have set the proper elevation for your height and
weight, stand on the running belt with your hands on the handrails for
balance. Your feet should slide slowly and easily away toward the rear of
the treadmill. Begin walking. When you are comfortable and well-balanced
on the treadmill, release your grip on the handrails. The running belt
should continue to move freely while you maintain your momentum. If the
running belt slows, stops, or becomes more difficult to walk on, consider
increasing the incline of the treadmill by moving the elevation tube up one
more setting.
200 pounds (lbs) and above
140 through 200 pounds
#1
#3
#6
#4
#5
Table 1
Elevation tube settings
according to user’s weight.
Setting #3
Elevation Tube Settings Dependent on Weight
#2
100 through 140 pounds
80 to 100 pounds
below 80 lbs
Elevation tube
Setting #1
Locking portion of pin
Height adjustment pin
80 lbs and below
Table 1 is an approximation and elevation tube settings may vary slightly
depending on differences in weight and the amount of lubrication between
the running belt and deck. Over time and extended use, you may need to
readjust the elevation tube setting or add lubricant between the running
belt and deck—this is normal and does not require a service call.
Remember that you want to be able to maintain your momentum on the
running belt without having to push off from the handrails. A lubrication
kit, available from an authorized Precor dealer, can be used as friction
(between the running belt and deck) increases. If you do lubricate the
deck, you may need to change the elevation settings. See Obtaining
Service to learn how to contact the authorized Precor dealer nearest you.
CAUTION: To avoid injury, the
locking pins should be
inserted and secured during
these steps.

page 14
2. Position the Treadmill on Its Side.(Diagram 11) Place one hand on each
handrail and gently tip the treadmill onto its side opposite the micro-
adjustment knob. See Diagram 11. Be sure the treadmill is balanced and
secure on its side and the micro-adjustment knob is
not resting on the
floor, before you let go of the handrails.
Diagram 11
Placing the treadmill on its side.
Left handrail
Running belt
Front lift bar
Micro-adjustment cable
CAUTION: Be sure that the
T-knobs are secure and the
handrails are locked into
position on both sides before
performing this step.
Diagram 12
Moving the elevation tube and
inserting the height adjustment pins.
3. Adjust the Elevation Tube.(Diagram 12) The elevation tube has six
settings (refer to Table 1). To move the height adjustment pin to another
setting, take the following steps.
Important: Due to the weight of the treadmill, always adjust the elevation
tube while the treadmill is resting on its side. Making adjustments in this
manner also alleviates the possibility of injury.
a. Remove the height adjustment pin by pushing up on the locking
portion that wraps around the tube. Use your fingers to pull the pin
out of the elevation tube hole. Repeat this step on the opposite side.
See Diagram 12. Set the height adjustment pins aside.
b. Slide the elevation tube so that the elevation tube and front lift bar
holes align at the proper setting.
Make sure that the settings are the
same on both elevation tubes.
CAUTION: To avoid injury, do
not place your fingers
between the locking portion of
the height adjustment pin and
the elevation tube.
Height adjustment pin
Locking portion of pin
Elevation tube

page 15
c. Reinsert the height adjustment pins and push down on the portion
that wraps around the tube to secure the pin into position. Pull and
push on the elevation tube to make sure that it is secure.
d. Return the treadmill to an upright position so that the base is flat on
the floor and go through the following check list.
Make sure that all the bolts and fasteners you installed are secure.
Use the hex key (E) to tighten any bolts that may be loose.
Check that the height adjustment pins are placed in the same setting
in both elevation tubes. If necessary, readjust the settings by
following steps 2 and 3 above.
Make sure that all excess lubricant has been wiped off of the running
belt and deck. Use paper towels or a clean cloth to wipe off the
lubricant.
Checking the Alignment of the Running Belt
Before working out on your treadmill, you need to check the alignment of the
running belt. The running belt on the 904 treadmill has been fully adjusted at
the factory and should track straight on the deck. However, if the running belt
seems to track off center or you hear a chafing noise, stop walking and check
the belt alignment by taking the following steps:
1. Walk on the treadmill while holding onto the handrails for balance.
2. Observe the running belt for a couple minutes.
3. If the running belt tracks off center or the belt moves toward either
flywheel, you need to align the belt.
4. If you determine that the belt needs alignment, follow the steps in Aligning
the Running Belt found in the maintenance section of this manual.
Once the treadmill is assembled, be sure to check the alignment of the belt
periodically. Adjust the running belt as soon as it needs alignment to prevent
tearing or fraying of the belt. Any damage due to improper maintenance of the
running belt is not covered by the limited warranty.
CAUTION: To avoid injury, the
locking pins should be inserted
and the handrails secured
during these procedures.

page 16
Using the Precor 904 Total Body Treadmill
In addition to providing an excellent cardiovascular workout, one of the
advantages of the 904 Total Body Treadmill is that it is simple to use. With very
little time or practice, you can learn how to use it effectively. This section
provides information about the following areas:
• beginning and ending your workout
• using the handrails
• working out on the treadmill
• adjusting the resistance of the running belt
Beginning Your Workout
Prior to beginning a workout, make sure that you have completed the following:
• assembled your 904 treadmill— Assembly Instructions
• adjusted the elevation tube settings— Adjusting the Elevation Tube
• checked the running belt alignment— Aligning the Running Belt
• determined handrail usage— Using the Handrails
• stretched your lower body and back— Working Out on Your 904 Treadmill
If a procedure has not been fully completed, refer to that section and complete
the tasks involved before beginning your workout.
Important: We strongly recommend that you secure the handrails in an upright
position while you become familiar with the micro-adjustment knob.
To begin a workout, step onto the running belt. Grasp the handrails and slowly,
turn the micro-adjustment knob to fine-tune the resistance of the running belt.
You should adjust the resistance so that you can walk comfortably, but
maintain momentum without holding onto the handrails for support. For more
information about working out, refer to Working Out on Your 904 Treadmill and
Using the Micro-Adjustment Knob .
Important: The micro-adjustment knob is a fine-tuning device. If you need to
turn the adjustment knob several rotations to maintain the running belt’s
resistance, try changing the settings in both elevation tubes. See Adjusting the
Elevation Tube . Screw threads appear and the micro-adjustment knob can fall
out of the handrail if it is rotated too many times.
Ending Your Workout
To end your workout, gradually slow your pace and reduce the speed of the
running belt till it comes to a complete stop. Step off the running belt and onto
the floor. If the handrails are not locked in an upright position, rest each one on
the safety stop. If you wish to store the treadmill, refer to the instructions found
in Storing the Treadmill .
Remember to incorporate a cool-down period into your workout. A cool-down
period helps you to gradually lower your heart rate and lessen excessive
muscle soreness or stiffness.
CAUTION: Before beginning
any fitness program, you
should have a complete
physical examination by your
physician.

page 17
Working Out on the 904 Treadmill
Before using your treadmill, we recommend that you follow these instructions
and go through a preliminary demonstration of the treadmill. Then, you will be
more familiar with the treadmill when you begin your workout. Diagram 13
shows a fully assembled 904 treadmill with the handrails resting on the safety
stops.
When using the treadmill, follow these general guidelines:
• At the beginning of a workout, take several minutes to bring your heart
rate into your training zone, as shown in Diagram 15 on page 22.
• After your workout, walk slowly for several minutes to cool down your
body and lower your pulse rate.
• Gently stretch your lower body and back before and after a workout to
help prevent stiffness or soreness.
To use the 904 treadmill, follow these steps:
1. Step onto the running belt and grasp the handrails.
Important: Lock the handrails into an upright position until you are
comfortable with the motion of the running belt. Remove the handrail’s
locking pins once you are familiar with the treadmill and are ready to
incorporate arm movement with your walking or running stride for a
“total body” workout.
Diagram 13
904 Total Body Treadmill.
904
USA
R
CAUTION: Before beginning
any fitness program, you
should have a complete
physical examination by your
physician.
Micro-adjustment knob

page 18
2. Begin walking on the running belt. You should start your workout at a
pace that will allow your heart rate to reach your training zone within 5
minutes. Refer to Diagram 15 on page 22. Fine-tune the resistance of the
running belt by slowly turning the micro-adjustment knob. Turn the knob
counterclockwise to increase resistance (clockwise to reduce resistance).
Refer to Using the Micro-Adjustment Knob .
Important: Be sure to set the proper incline before working out and
adjusting the resistance. Refer to Adjusting the Elevation Tube .
3. After your initial warm-up period, maintain your heart rate in your training
zone during your aerobic session. Refer to Diagram 15 on page 22. While
you are walking (or running), maintain a smooth, even stride with the back
and forth motion of the handrails. If you are uncomfortable, lock the
handrails in an upright position while you become more familiar with the
motion of the running belt.
Note: It takes time to incorporate the motion of the handrails into your
workout. Try to reflect the natural movement of your arms when using the
handrails. Because you are working out on a machine, you have the
tendency to overextend your arms. Relax and imagine that you are walking
briskly down the sidewalk. How would your arms enhance your walk or
run? Try to imitate and incorporate that natural, fluid motion throughout
your workout.
4. When you are through exercising, cool down for 3 to 5 minutes by
gradually reducing your belt speed. A proper cool down helps to transport
excess lactic acid out of the working muscles which allows them to
recover faster.
5. To end your workout, stop walking or running. Step off the running belt
and onto the floor and place the handrails against the safety stops.
For best results, vary your workouts by changing duration, intensity, and type
of work (such as interval training). We recommend that you keep track of your
workouts by writing them down. This helps you monitor your progress toward
your fitness goals and also use the information as a reference in planning
interesting, challenging workouts.
Using the Handrails
The handrails on the 904 treadmill provide additional benefits when used to
enhance the natural movement of your arms during a workout. Exercise and
tone your upper body for the “total body workout” by moving the handrails
back and forth in natural rhythm with your walking or running stride.
Before using the handrails for an upper body workout, make sure that you have
completed the following procedures:
• assembled your 904 treadmill— Assembly Instructions
• adjusted the elevation tube settings— Adjusting the Elevation Tube
• checked the running belt alignment— Aligning the Running Belt
• set the handrail resistance— Adjusting the Handrail Resistance
• removed the locking pins— Adjusting the Handrail Resistance
Becoming familiar with the movement of the running belt and the motion of the
handrails takes time. Try to reflect on the natural movement of your arms when
you are walking or running. Imitate that motion while working out on the
treadmill.
CAUTION: Before leaving the
treadmill unattended, secure
the handrails into an upright
position using the locking
pins.

page 19
Tips for using the handrails follow:
• Use the locking pins to secure the handrails in an upright position until
you are comfortable with the movement of the running belt. Once you are
comfortable, you can remove the locking pins. The wire loops attached to
the locking pins let you hang the locking pin on the T-knob.
• Use the T-knobs to adjust the resistance of the handrails so that you can
easily push and pull the handrails back and forth.
• Match the natural movement of your arms when walking or running. Keep
your arms slightly bent at the elbows. Do not overextend your arms.
• Maintain a smooth, fluid motion. Move the left arm forward with your left
leg. Move your right arm forward with your right leg.
• Do not bounce, bob, or rock back and forth. Keep your back straight and
erect while you workout.
Adjusting the Handrail Resistance
The handrail resistance can be loosened by turning one T-knob counterclock-
wise. You do not need to turn both T-knobs. Turning one T-knob automatically
balances the handrail resistance for both sides.
Important: You have to remove the locking pins to use the handrails for an
upper body workout.
Make sure that you hold onto the handrail with one hand while you loosen the
T-knob with the other. Check the resistance of the handrails prior to starting
your total body workout. You want the handrails loose enough to maintain the
natural motion of your arms while you are walking or running. However, the
handrails should provide enough resistance that you feel the need to push and
pull the handrails after your warm-up period.
CAUTION: To avoid injury,
always rest the handrails
against the safety stops before
turning the T-knobs.
CAUTION: If the T-knobs are
loose, the handrails can free
fall toward the rear of the
treadmill. To avoid injury,
always rest the handrails on
the safety stops when
adjusting the handrail
resistance.

page 20
Using the Micro-Adjustment Knob
The micro-adjustment knob on the 904 treadmill allows adjustments that affect
the movement of the running belt. Adjust the resistance while you are walking
or running on the treadmill. Before using the micro-adjustment knob, make
sure that you have completed the following procedures:
• assembled your 904 treadmill— Assembly Instructions
• adjusted the elevation tube settings— Adjusting the Elevation Tube
• checked the running belt alignment— Aligning the Running Belt
• determined handrail usage— Using the Handrails
Diagram 13 on page 17 shows the location of the micro-adjustment knob on
the 904 treadmill.
Note: Remember that the running belt should move freely while you maintain a
comfortable momentum (without holding onto the handrails).
If more than one person in your household uses the treadmill, be sure to
release the belt resistance at the end of your workout by turning the micro-
adjustment knob clockwise till it stops. This allows the next person on the
treadmill to properly readjust the elevation and resistance according to his or
her needs. Refer to Table 1 on page 13 to set the treadmill to the proper
elevation before beginning a workout.
• To increase the resistance of the running belt and decrease speed, slowly
turn the knob counterclockwise. The micro-adjustment knob is a fine-
tuning device. Screw threads appear if the micro-adjustment knob is
rotated too many times. If you see the threads beginning to appear, turn
the knob clockwise till it stops, step off the treadmill, and readjust its
incline. Refer to Adjusting the Elevation Tube .
• To reduce the resistance of the running belt and increase speed, slowly
turn the knob clockwise.
Important: If the micro-adjustment knob is turned clockwise as far as it can go
and you need to continually push against the handrails to keep the running belt
moving, you will need to raise the elevation and reset the height adjustment
pins into the next hole. Refer to Adjusting the Elevation Tube .
CAUTION: Avoid excessive
wear to the running belt by
setting the proper elevation for
your weight. Refer to Table 1
on page 13.