Precor EFX 5.21i User manual

page1
Owner’s Manual
Elliptical Fitness
Crosstrainer

page2
Before beginning any fitness program, you should obtain a complete physical examina-
tion by your physician.
Il est conseillé de subir un examen médical complet avant d’entreprendre tout
programme d’exercise. Si vous avez des étourdissements ou des faiblesses, arrêtez
les exercices immédiatement.
DANGER:To reduce the risks of electrical shock always unplug the EFX®
from the electrical outlet immediately after using and before
cleaning.
WARNING:To reduce the risk of burns, fire, electric shock, or injury to persons,
take the following precautions:
• Do not allow children or those unfamiliar with its operation on or near the EFX.
Do not leave children unsupervised around the EFX.
• Never leave the EFX unattended while it is plugged in. Unplug the unit from the outlet
when it is not in use, before cleaning it, and before putting on or taking off parts.
• Assemble and operate the EFX on a solid level surface. Locate the EFX a few feet
from walls or furniture. Check the unit before each use and verify that all fasteners are
secure. Maintain the EFX in good working condition. (See the Maintenance section).
• Use the EFX only for its intended use as described in this manual. Do not use
accessory attachments that are not recommended by the manufacturer, such
attachments might cause injuries.
• Use care when getting on or off the EFX. Use the handrail whenever possible. Keep
your body and head facing forward. Never attempt to turn around on the EFX.
• Wear proper exercise clothing and shoes during a workout.Tie long hair back.
• Do not rock the unit. Do not stand on the display console or casing.
• Never drop or insert any object into any opening. Keep towels and hands away
from moving parts.
• If you purchased the optional heart rate receiver and POLAR®chest strap,
review the guidelines found in the Precor Heart Rate Option Owner’s Manual
that is supplied with that option.
• Do not overexert yourself or work to exhaustion. If you feel any pain or abnormal
symptoms, stop your workout immediately and consult your physician.
• Keep all electrical components away from liquids to prevent shock. Do not set
anything on the casing, handlebars, or display console. Place liquids, books, or
magazines in the appropriate receptacles.
• Never operate the unit if it is damaged, if it is not working properly, if it has been
dropped, or dropped in water. Return the unit to a service center for examination and
repair.
• Keep the power cord away from heated surfaces.
• Do not operate where aerosol (spray) products are being used or where oxygen
is being administered.
• Do not use outdoors.
• Do not attempt to service the EFX yourself other than the assembly and mainte-
nance instructions found in this manual. Refer to
Obtaining Service .
IMPORTANT SAFETY INSTRUCTIONS
IMPORTANT SAFETY INSTRUCTIONS
SAVETHESE INSTRUCTIONS

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SafetyApproval
When identified with the ETL-c logo, the EFX has been tested and conforms to the
requirements of CAN/CSA-E-335-1/2-94, Safety of Household and Similar Electrical
Appliances.
Grounding Instructions
The EFX®5.21i must be grounded. If it should malfunction or break down, grounding
provides a path of least resistance for electric current which reduces the risk of
electrical shock.The unit is equipped with a power cord having an equipment-
grounding conductor and a grounding plug. The plug must be inserted into an
appropriate outlet that is properly installed and grounded in accordance with all local
codes and ordinances. If you do not follow these Grounding Instructions , you could
void the Precor limited warranty.
IMPORTANT SAFETY INSTRUCTIONS
SAVETHESE INSTRUCTIONS
Diagram 1
Correct power outlet for
U.S. Markets: 15 amp
120-volt plug.
120-volt grounding plug
DANGER: Improper connection of the equipment-grounding conductor can
result in a risk of electric shock. Check with a qualified electrician or service person if
you are in doubt as to whether the unit is properly grounded. Do not modify the plug
provided with the EFX if it doesn’t fit the outlet, get a proper outlet installed by a
qualified electrician.
120V Units Designated for U.S. Markets
The EFX®5.21i is for use on a circuit with a nominal 120-volt rating.The unit’s ground-
ing plug looks like the plug illustrated in Diagram 1. The power outlet must have the
same configuration as the plug. No adapter should be used with this product.
IMPORTANT SAFETY INSTRUCTIONS

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RadioFrequency Interference (RFI)
Federal Communications Commission, Part 15
The EFX®5.21i has been tested and found to comply with,
• the IEC EMC Directive (international electromagnetic compatibility certification)
• the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.These
limits are designed to provide reasonable protection against harmful interference in
a residential installation. The EFX generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the owner’s manual
instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation.
If the EFX does cause harmful interference to radio or television reception, which
can be determined by turning the EFX OFF and ON, you are encouraged to try to
correct the interference using one or more of the following measures:
• Reorient or relocate the receiving antenna for your TV, radio, VCR, etc.
• Increase separation between the EFX and the receiver (TV, radio, etc.).
• Connect the EFX into a different power outlet—on a dedicated circuit different
from the one used by the receiver (TV, radio, etc.). No other appliance should be
plugged into the same power outlet that the EFX is connected to.
• Consult your dealer or an experienced radio/TV technician for help.
WARNING: Per FCC rules, changes or modifications not expressly
approved by Precor could void the user’s authority to operate the equipment.
Canadian Department of Communications
This digital apparatus does not exceed the Class B limits for radio noise emissions
from digital apparatus set out in the Radio Interference Regulations of the Canadian
Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioéélectriques dépassant
les limites applicables aux appareils numériques de la class B prescrites dans le
Règlement sur le brouillage radioélectrique édicté par le ministére des Communica-
tions du Canada.
ATTENTION:HauteTension Débranchez avant deréparer

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About this Manual
The following conventions are used in this manual.
Note: Contains additional information that applies to the preceding text.
Important: Indicates information to which you should pay special attention.
CAUTION: Indicates steps or information necessary to prevent harm to yourself
or damage to the equipment.
WARNING: Provides instructions to prevent electrical damage to the equipment
and prevent injuries to yourself or others.
DANGER: Indicates steps you must take to prevent electrical shock.

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Important Safety Instructions ..........................................2
Safety Approval ................................................................................. 3
Grounding Instructions...................................................................... 3
Radio Frequency Interference (RFI) ................................................. 4
About this Manual ............................................................................. 5
Before You Begin ..............................................................9
Obtaining Service.............................................................................. 9
Serial Number Location .................................................................... 9
Unpacking the EFX®5.21i................................................................ 10
Optional Equipment ........................................................................ 10
Acquiring the Appropriate Tools...................................................... 10
Hardware Kit ................................................................................... 11
Setting Up the EFX®............................................................................................... 12
Installation Requirements ............................................................... 12
Assembly Instructions ..................................................................... 12
Turning the Unit ON and OFF.......................................................... 22
Using the EFX®............................................................................................................ 23
Removing the Locking Pin.............................................................. 23
Using the Handrails ........................................................................ 23
Workout Tips.................................................................................... 24
Quick Steps to Working Out ............................................................ 24
Cooling Down After a Workout ....................................................... 25
Inserting the Locking Pin ................................................................ 26
The Setup Mode and the QuickStartTM Feature .............................. 26
Pause, Cool Down, Workout Summary, and Exit Features ............ 27
The EFX®5.21i Display...................................................29
Features on the Display Console ................................................... 29
SmartRate®Feature ........................................................................ 30
Heart Rate Feature ......................................................................... 30
Setup Mode and Prompts ............................................................... 30
Electronic Display ........................................................................... 31
The EFX®5.21i Keypad ..................................................32
Keypad Tips..................................................................................... 32
Special Keypad Functions Precor Banner ..................................... 32
Keys on the Keypad ........................................................................ 33
Changing the Display Features Using the SELECT Key ............... 34
Table of Contents
1
2
3
4
5

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7
8
6Advanced Techniques for the EFX®5.21i ......................35
Programming Tips .............................................................................35
Selecting a U.S. Standard or Metric Display.....................................35
Viewing the Odometer, Hours of Use,
Software Version, and Error Log .......................................................36
The EFX®5.21i Course Features and Descriptions .....37
Utilizing the SmartRate®Feature ......................................................37
Utilizing Heart Rate Interactive Capabilities.....................................37
Course Descriptions .........................................................................38
Using the POLAR®Equipment ......................................42
Wearing the POLAR®Chest Strap ....................................................42
Storing the POLAR®Chest Strap......................................................42
Maintaining the EFX®............................................................................................ 43
Inspection ..........................................................................................43
Cleaning the Equipment ...................................................................43
Servicing the EFX..............................................................................43
Long Term Storage............................................................................43
Exploded Views.................................................................................44
Warranty Card ...................................................................................51
Specifications ..................................................................... back cover
9
Table of Contents, continued

page8
Notes:

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Thank you for purchasing the Precor EFX®5.21i.The EFX features a zero impact,
elliptical-shaped stride that lets you target specific lower-body muscles to achieve
better muscle tone and overall cardiovascular conditioning.
The EFX offers an easy-to-understand display console that provides motivating
feedback about your workout. It can store workout information so that your last course
used, workout time, weight, and age parameters are easily retrieved. The ultra-
sensitive keypad lets you select display features and control your workout session.
Precor SmartRate® — a visual aid that lets you see your heart rate with a glance, provides
the latest in cardiac monitoring.
Note: For the heart rate features to appear, a POLAR®chest strap must be worn and
the optional receiver must be purchased and installed in the display console. See
Obtaining Service below.
The EFX®5.21i is for household use only.To maximize your use of the EFX, please study
this guide thoroughly.
Obtaining Service
Do not attempt to service the EFX yourself except for the maintenance procedures
described in this manual. The EFX®5.21i does not contain any user-serviceable parts.
For information about product operation or service, check out the Precor Web Site at
www.precor.com or call Precor Customer Support at 1-800-347-4404.
Before You Begin
1
Diagram 2
EFX5.21i serial
number label
location.
EFX5.21i
If you contact Precor Customer Support, have your model and serial number available.
Serial Number Location
The serial number is printed on a label located on the rear cover. See Diagram 2.
Turn OFF the EFX and write the serial number and date of purchase in the space
provided below.
Model #: ________ Serial #: _____________________ Date purchased: _______

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Unpacking the EFX®5.21i
The EFX is carefully tested and inspected before shipment. Precor ships the unit in
several components, as listed below:
• base frame assembly • left and right handrails
• upright support • display console assembly
• base frame stabilizers (left and right) • bracket and side covers
• owner’s manual and hardware kit • lift cover
Optional Equipment
Optional equipment that you can purchase through your dealer includes:
• the Precor Heart Rate Option
Additional POLAR®chest straps can also be purchased through your dealer. To
locate the dealer nearest you, visit the Precor web site at www.precor.com or call
1-800-347-4404.
Carefully unpack the pieces of the unit and lay them on the floor near the
location where you plan to use the EFX.
Acquiring the AppropriateTools
Obtain the following tools before assembling the EFX.
Wire cutter – for cutting wire ties
Phillips head screwdriver
Two 9/16-inch combination wrenches (open-end and box)
SAE Standard socket set with socket extension (for 9/16-inch bolts)
Rubber mallet
CAUTION:This unit weighs over 183
pounds (82 kilograms).To avoid injury and
to ensure the safety of the unit and
yourself, get adequate assistance before
unpacking your EFX. Break down the
container’s side walls before removing
anythingfrom the box.

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B
Diagram 3
Hardware kit.
A
HardwareKit
After unpacking the unit, open the hardware kit (refer to Diagram 3) and make sure
that you have the following items:
(A) 3/16-inch hex key — secures handrails in handrail clamp
(B) 5/32-inch hex key — secures front covers
(C) End cap
(D) Four Phillips-head 1/2-inch screws — attach display console
(E) Four buttonhead 3/4-inch screws — secure front covers
(F) Twenty-two hex head 1-inch bolts — attach upright, handrails and stabilizers
(G) Twenty-two 3/8-inch washers — attach upright and stabilizers to base
(H) Power cord
(J) Height adjuster (shown with hex nut)
If any items are missing, contact Precor Customer Support at 1-800-347-4404.
Note: After assembling the EFX, be sure to store the hex keys in a secure place.The
tools are used for specific maintenance procedures that are described in this manual.
C
E
H
D
G
F
J

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You do not need any special knowledge or experience to set up the EFX. However,
you will need to obtain appropriate assistance during assembly.
InstallationRequirements
Follow these installation requirements when installing the EFX.
Important: If you do not install the unit according to the following guidelines, you could
void the Precor limited warranty.
•Set up the EFX on a solid, flat surface. Unpack and assemble the unit close to
where you plan to use it.Make sure that the flat surface under the unit is smooth
and level. A level unit is required for the user’s safety and proper operation.
Important: If you plan to move the EFX, do so before you install the handrails.
Ask for assistance to move the unit. Once the handrails are in place, the unit is
too wide to fit through a standard (32-inch) door frame.
•Provide ample space around the unit. Open space around the unit makes for a
safer mount and dismount.
•Fill out and mail the limited warranty card.Be sure that the EFX is turned OFF. The
serial number is printed on a label located on the rear cover near the power
receptacle. Write the serial number onto the Precor limited warranty card found on
the back cover of this manual. Refer to Obtaining Service on page 9 and write the
number there as well.
•Use the appropriate voltage and grounding as specified on the EFX.The unit is
available in a 120-volt model. Refer to the unit’s identification label to determine the
voltage that is required.
Assembly Instructions
Take the following steps to assemble the EFX.To assist you in the assembly, the
items in the Hardware kit, shown in Diagram 3, correspond to a particular letter in
the alphabet. These letters appear throughout the assembly instructions. Refer to
Diagram 3 as needed.
1. Obtain assistance. Ask for assistance to help assemble the EFX. Place the
shipping carton close to the location where you plan to use the unit. Breakdown the
side walls of the shipping carton so that they lie flat. Remove the loose contents.
2. Make sure that the power is OFF.Place the switch in the O (OFF) position.
Make sure that the unit is not plugged into a power source.
3. Remove the EFX from the box. Cut any tie wraps that hold the EFX to its
shipping container. Sort through the packing materials.
4. Move the unit to the location where you plan to use it. When fully assembled,
the EFX®5.21i is heavy and difficult to move.To avoid injury or damage to the
unit, ask for help in placing the EFX where you plan to use it.
Setting Up the EFX®
2
CAUTION: Do not remove or otherwise
bypass the 3-prong plug with an adapter or
extension cord in order to use a non-
grounded outlet. Electrical damage can
occur if the EFX is connected to an
improper power source.
CAUTION:Once the handrails are in place,
the unit is too wide to fit through a standard
32-inch door frame.

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5. Remove the height adjuster (J) from the Hardware kit and thread it into the
Front base tube. Diagram 4, #1 and #2. Ask an assistant to lift the front base
tube while you turn the height adjuster in a direction that lowers the front of the
assembly. Tighten the nut with a combination wrench (open or box-end) when
the height adjuster is fully threaded into the front base tube.
6. Cut the tie wrap holding the plastic grommet. Diagram 4, #3. Use a wire cutter
(or scissors) to remove the plastic grommet from the RJ45 cable.
Diagram 4
Front base assembly.
Cut the tie wrap that
secures the grommet
to the cable.
Height adjuster
1
23
Turn the height
adjuster so that the
nut is secure against
the front base tube.
Wrench tighten the
nut.
Diagram 5
Insert grommet and route
lift motor cable.
Plastic grommet
Lift motor cable
7. Insert the plastic grommet. Diagram 5. Press down on the grommet so that it
snaps into place.Thread the lift motor cable through the grommet.
8. Prepare for the attachment of the upright support to the base assembly.
Remove the four phillips-head screws (D), two bolts (F), and two washers (G) from
the Hardware kit. Place one washer (G) on each of the two bolts (F). Keep the
fasteners together.
RJ45 Cable
CAUTION: Grease on the lift screw can
stain clothing.
Note:The lift motor
and screw are not
shown in these
illustrations.
Front base tube
Front base tube
Lift motor cable

page14
Diagram 6
9. Route the display console cable through the upright support. Diagram6, #1.
Remove any tape or wire ties on the cable. Have an assistant hold the upright
support securely while you grasp the display console in one hand and route the
cable through the upright support with the other.
10. Attach the display console. Diagram 6, #2. Use the four phillips-head screws (D)
to attach the display console to the upright support. Have your assistant hold the
upright support securely while you align the mounting holes and tighten the screws.
11. Position the upright support over the base. Diagram 7. Have your assistant
move the upright support close to the front of the base assembly while you
thread the RJ45 cable through the grommet hole and out the front of the base
tube (refer to the inset in Diagram 7, #1). Make sure that the display console (on
the upright support) faces the rear of the unit (refer to Diagram 7, #2).
12. Route the lift motor cable through the cutout in the upright support.
Diagram 7, #1. While your assistant holds the upright support, thread the lift
motor cable through the cutout. Once the cable is routed, rest the upright
support on the base tube.
13. Secure the upright support to the base assembly. Refer to Diagram 7, #2. Align
the mounting holes and thread the two bolts (F) with washers (G) through opposite
sides of the upright support and into the base assembly. Finger tighten each bolt.
Do not fully tighten the fasteners until the entire unit has been assembled.
Route the cable and
attach the display
console to the
upright support.
Display console
CAUTION: Do not stretch, crimp, or
damage the cable. Excess cable may be
gently pushed into the base assembly.
Cables damaged by improper installation
will not be covered by the Precor limited
warranty.
CAUTION: As you assemble the unit, do
not fully tighten the fasteners until
instructed to do so. Finger tighten the
fasteners or use the hex key so that the
unit is stable, but leave room for final
adjustments.
Upright support
Cable
Diagram 7
Route the cable
through the upright
support. Attach the
support to the base.
Upright support
Have your assistant
hold the upright
support while you
secure it to the base.
2
1
Two bolts (F)
with washers (G)
2
1
Lift cable
Upright
support
Upright support
bracket
RJ45 cable
receptacle

page15
14. Connect the RJ45 cable into its black receptacle. Diagram 8, #1. Just like a
telephone connection, a definite “click” is heard when a good connection is
made. If you do not hear a “click,” try reinserting the cable connection again.
15. Connect the lift motor cable. Diagram 8, #2
16. Push excess cable inside base tube. Diagram 8, #3. Carefully, push any excess
cable behind the height adjuster threads that protrude from inside the base tube.
Diagram 8 Connect the
cables.
Cable connector
Cable receptacle
Place excess cable
into the base
assembly.
Height adjuster
threads
Base tube
Lift motor cable
2
1
3
Diagram 9 Place the base
on supportive
blocks.
Adjustable rear pad
Supportive wedge
Base assembly
17. Rotate the rear pads. Diagram 9, inset. Ask your assistant to stabilize the unit
while you rotate the rear adjustable feet to the highest position.This procedure
lifts the base assembly off the floor which provides better access to the fasteners.
18. Support the front of the unit with packing material. Diagram 9. Have an
assistant lift the upright support so that you can slide a wedge of packing
material under the front of the unit.

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Diagram 10 Attach the frame
stabilizers to the
upright support
bracket and base
tube.
19. Attach the left and right frame stabilizers. Diagram 10.Take the following
steps to install the frame stabilizers onto the base assembly.
Note: Proceed with one side at a time. When you have installed the first stabi-
lizer, perform the same steps on the opposite stabilizer.
a. Remove four bolts (F) and four washers (G) from the Hardware kit. Place a
washer on each bolt and set the fasteners within easy reach of the unit.
b. Grasp one of the frame stabilizers and align it with the upright support
bracket. Have your assistant hold it in place.
c. Insert the four bolts (F) with washers (G) through the frame stabilizer and
upright support bracket. See Diagram 10.
d. Thread all four bolts and washers until the frame stabilizer is secure. Do not
fully tighten the bolts until after the lower section is attached to the base
assembly.
e. Perform steps a through d on the opposite side.
Diagram 11 Attach the lower
frame stabilizers
to the base
assembly.
Bolts
f. Carefully align the mounting holes on the right and left frame stabilizer with
the base frame holes. Insert four bolts (F) and washers (G) on both sides.
Thread the bolts through the unit. See Diagram 11.
g. Tighten the bolts so that the unit is stable, but leave room for final adjustments.
Do not securely tighten the bolts until the unit has been fully assembled.
Frame stabilizer
Bolts (F) and
washers (G)

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21. Remove cover fasteners from EFX. Diagram 13. Use a phillips head screw-
driver to remove:
• two screws, one on each side of the upright bracket support
• four screws, two on each side of the base tube near the lift motor
• two screws from the base of the upright bracket support. Note that the screw
closest to the ramp is 3/4-inch in length. (Refer to Diagram 14.)
Diagram 13 Remove the cover
fasteners.
Diagram 12 Tighten the
mounting bolts.
20. Tighten all mounting screws. Start with the eight bolts that attach the frame
stabilizers to the base frame. Alternately tighten each bolt to help pull the rest of
the parts into alignment. Then, proceed with tightening the four bolts installed in
each of the two upright support brackets (see Diagram 12) and next, the two
bolts that secure the upright support to the base frame.
Remove fasteners.
Bolts (F) and
washers (G)
Frame stabilizer
Upright
support
bracket
Remove fasteners
from base tube.
Upright bracket
support

page18
CAUTION: Do not overtighten the screws
or you may inadvertently cause stress
cracks in the plastic.
Diagram 14 Install the lift cover.
Lift cover
22. Install the lift cover. Diagram 14.The center holes (see inset) on the lift cover
are used for mounting it to the base of the upright bracket support. (The two side
holes are used for a different assembly.)
a. Position the lift cover as shown in Diagram 14.
b. Insert the 3/4-inch screw into the mounting hole closest to the ramp and
finger tighten.
c. Insert the 1/2-inch screw closest to the upright support.
d. Tighten both screws with a phillips head screwdriver.
Important: Do not overtighten or you may crack the plastic cover.
3/4-inch screw
Center holes in
lift cover
Diagram 15 Install the side
covers.
Side cover
Two phillips head
screws removed
from the frame.
23. Install side covers. Diagram 15. Perform the following steps on one side of the
unit and then, repeat the steps on the opposite side.
a. Grasp one side cover and rotate it so that it slips inside the ramp cutout.
Have your assistant hold it in place.
b. Remove the two 3/4-inch buttonhead screws (E) and 5/32-inch hex key (B)
from the Hardware kit.
c. Insert the two screws (E) at the top of the cover and alternately tighten using
the hex key (B).
d. Insert the two phillips head screws (removed earlier from the base in step 21)
and alternately tighten using a phillips head screwdriver.
e. Perform steps a through d on the opposite side.
Ramp cutout
3/4-inch
buttonhead screw
(E)

page19
24. Insert the left and right handrails into the upper clamp. Diagram 16. Using
one hand, apply pressure on the portion of the handrail being inserted into the
clamp while, with the other hand, lift and lower the base of the handrail.This
rotating motion helps move the handrail into the clamp. Repeat this step for the
opposite handrail.
25. Check the gap in the upper clamp. Diagram 16, inset. Look underneath the
handrail clamp to see that the gap, which exists between the two ends of the
handrails, is no greater than 1/2-inch.
Diagram 16 Insert the handrails
into the handrail
clamp.
26. Secure the handrails. Diagram 17. Align the handrail base mounts with the
handrail bracket. Insert two bolts (F) and washers (G) and finger tighten. Repeat
this step for the opposite handrail.
a. Check the gap between the ends of the handrails in the clamp. Refer to
Diagram 16, inset.
b. With the gap between 1/4-inch and 1/2-inch, tighten the bolts in the
handrail clamp using the hex key provided.
c. Return to the bolts (F) in the base of the handrails and tighten each
securely using a 9/16-inch socket extension and wrench.
Handrail clamp
Handrail
Upright support
bracket
Tighten bolts in
handrail clamp.
Gap between
handrail ends
inside clamp
should be
no greater than
1/2-inch.
Diagram 17 Secure the handrails.
Display console
Handrail
Screws (F) and
washers (G)

page20
Diagram 18 Attach the
bracket cover.
27. Attach the bracket cover. Diagram 18.Take the following steps to attach the
bracket cover over the upright support bracket.
Note: Protrusions inside the front of the bracket cover help secure the cover to
the upright support. See Diagram 18.
a. Position the bracket cover so that the protrusions inside the cover “latch”
onto the front of the upright support bracket.
b. Lower the bracket cover and align the mounting holes.
c. Reinsert the two screws, removed in step 21, and tighten securely. Do not
overtighten or you may inadvertently crack the plastic mounts.
Bracket cover
Tighten bracket
cover screws.
CAUTION: Do not overtighten the screws
or you may inadvertently cause stress
cracks in the plastic.
Diagram 19 Slide the handrail
boot over the
fasteners.
Handrail
Correct orientation
of handrail boot.
Protrusions
inside cover
Upright support
28. Slide the handrail boot over the lower handrail mounts.The boot is asymmetrical.
Position it so that the longer side faces the upright support. See Diagram 19.