Britax MARATHON CLICKTIGHT User manual

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Tel.: [phone]
www.Britax.com
Britax Child Safety, Inc.
4140 Pleasant Road
Fort Mill, SC 29708 USA
A Britax Childcare company
MARATHON®CLICKTIGHT™
User Guide
Guia del usuario

1
Britax®, CLICKTIGHT™, EZ-Buckle™, and MARATHON® are trademarks owned
by Britax and registered in the U.S.A. and other countries. All rights reserved.
©2020 Britax Child Safety, Inc. This product and its components are subject to
change without notice. Printed in USA. P11857600 _A:01.20
Table of Contents
Child Seat Features ��������������������������������������� 2
Safety Information����������������������������������������� 4
Warnings .................................................................. 4
Important Notes ....................................................... 5
Registration.............................................................. 5
Certification.............................................................. 6
Child Fit Information ................................................ 7
Rear-Facing Installation�������������������������������� 8
Lap-Shoulder Belt Installation (Preferred Method)... 8
Lower Anchor Installation ...................................... 10
Lap Belt Installation ............................................... 12
Forward-Facing Installation������������������������ 14
Lap-Shoulder Belt Installation (Preferred Method) 14
Lower Anchor Installation ...................................... 16
Lap Belt Installation ............................................... 18
Securing Your Child������������������������������������� 20
Child Seat Functions ����������������������������������� 22
Adjusting the Harness Height ................................ 22
Adjusting the Harness Length................................ 22
Harness Buckle Position........................................ 24
Using the Harness Buckle ..................................... 24
Using the Chest Clip ............................................. 24
Comfort Pillow ....................................................... 25
Seat Positions ........................................................ 25
Uninstalling the Seat.............................................. 26
Anti-Rebound Bar (Select Models) ........................ 27
Using the Lower Anchors and Tethers for Children
(LATCH) .................................................................. 28
Lower Connectors.................................................. 28
Impact Absorbing Tether ....................................... 29
Vehicle Compatibility����������������������������������� 32
Vehicle Seating Positions....................................... 32
Incompatible Vehicle Seat Belts ............................ 33
Maintenance ������������������������������������������������ 34
Cover ..................................................................... 34
Harness Buckle...................................................... 38
Impact Absorbing Chest Pads............................... 40
Cleaning ������������������������������������������������������� 43
Troubleshooting������������������������������������������� 44
Warranty ������������������������������������������������������� 45

2
Britax Child Safety, Inc.
Child Seat Features
Front
Rear
1
2
3
7
4
8
9
11
12
10
17
18
19
20
21
22
16
24
25
26
28
30
31
32
29
27
15
13
14
5
6
23

3
MARATHON CLICKTIGHT User Guide
Description
1. Cover
2. Harness Height Adjuster
3. Head Pad
4. Comfort Pads
5. User Guide Storage (in pocket behind cover)
6. Chest Clip
7. Comfort Pillow
8. Forward-Facing Belt Slot / Harness Holder
9. Lower Connector Strap (LATCH component)
10. Lower Connector Adjuster Release Button (LATCH
component)
11. Lower Connector Adjuster (LATCH component)
12. Lower Connector (LATCH component)
13. CLICKTIGHT Bezel
14. Harness Release Button (red)
15. CLICKTIGHT Dial
16. Impact Absorbing Chest Pads
17. Harness Buckle
18. EZ-Buckle™ Belly Pad
19. Serial Number & Manufactured Date Label (under seat
cover)
20. CLICKTIGHT Mechanism
21. Harness Adjuster Strap
22. Recline Adjustment Handle
23. Anti-Rebound Bar (select models)
24. Shell
25. Rear-Facing Belt Slot
26. Recline Indicator
27. Impact Absorbing Base
28. Impact Absorbing Tether (Top Anchorage Strap - LATCH
component) - stored in Tether Storage Compartment
29. Tether Storage Compartment
30. Harness Yoke
31. Harness Straps
32. Lower Connector Storage

4
Britax Child Safety, Inc.
Safety Information
Failure to follow all warnings and instructions could result
in SERIOUS INJURY or DEATH.
FIT REQUIREMENTS
• Use only in a rear-facing position when using it with
an infant weighing less than 20 lbs (9.1 kg).
• Use only with children who weigh between 5 and 65 lbs
(2.3 and 29.4 kg) and whose height is 49 in. (124.5 cm)
or less. Use rear-facing for children who weigh between
5 and 40 lbs (2.3 and 18 kg). Use forward-facing for
children who weigh between 20 and 65 lbs (9.1 and
29.4 kg).
• Snugly adjust the belts provided with this child
restraint around your child.
INSTALLATION
• Secure the top anchorage strap provided with this
child restraint.
• Secure this child restraint with the vehicle’s child
restraint anchorage system if available, or with a
vehicle belt.
• Use the buckle slot closest to, but not underneath, your
child when installing the child seat.
GENERAL USAGE
• Follow all instructions on this child restraint and in the
written instructions.
• Register your child restraint with the manufacturer.
• In a vehicle with rear designated seating positions,
vehicle owners should be alerted that, according to
accident statistics, children are safer when properly
restrained in the rear seating positions than in the
front seating positions. To ensure your child’s safety,
please study Vehicle Seating Positions on page 32
and consult your vehicle owner’s manual.
• Always make sure the child restraint system is
secured to the vehicle, even when unoccupied, since
in a crash an unsecured child restraint system may
injure occupants.
• To prevent injury due to deterioration or hidden
damage, discontinue use of this child seat if it is
older than ten years or has been in a moderate or
severe crash (see below). See Serial Number and
Manufactured Date Label on child seat (pages 2-3).
• The use of non-Britax covers, inserts, toys,
accessories, or tightening devices is not approved
by Britax. Their use could cause this child seat not to
perform as intended in a crash.

5
MARATHON CLICKTIGHT User Guide
Important Notes
• Do not install with the lower anchors for a child weighing
more than 35 lbs (15.8 kg) rear facing or 40 lbs (18 kg)
forward facing.
• Do not use the top tether strap with rear-facing installations.
• Ensure that the shell cover is properly secured behind
the red markers to allow for proper functioning of the
CLICKTIGHT mechanism (see page 36).
• Discontinue use of this child seat if it has been in a
moderate or severe crash. It is not necessary to replace a
car seat after a minor crash, defined by the US National
Highway Trac Safety Administration (NHTSA) as:
a. The vehicle is drivable from the crash site; and
b. The vehicle door nearest the child seat was not
damaged; and
c. No vehicle occupants were injured; and
d. There is no visible damage to the child seat; and
e. The airbags (if present) did not deploy.
• Cover the child seat when the vehicle is parked in direct
sunlight. Metal parts of child seat could become hot
enough to burn a child.
• Store the child seat in a safe place when it is not being
used. Avoid placing heavy objects on top of it.
• Do not, except as described in this booklet, attempt to
disassemble any part of the child seat or change the way
the harness or vehicle’s seat belts are used.
• Never use the harness adjuster strap to lift or carry this
child seat. Doing so could cause damage to harness
adjuster and webbing. Always carry this child seat by its
shell or tether straps.
Registration
Child restraints could be recalled for safety reasons. You
must register this restraint to be reached in a recall. Send
your name, address, e-mail address if available and the
restraint’s model number and manufacturing date to Britax
Child Safety, Inc. P.O. Box 91167 Allentown, PA 18109-
9925, or call 1-888-427-4829 or 1-704-409-1699, or register
online at us.britax.com/registration. For recall information,
call the U.S. Government’s Vehicle Safety Hotline at 1-888-
327-4236 (TTY 1-800-424-9153), or go to http://www.
NHTSA.gov.
For your convenience, record all the information about
your child seat below. Refer to the Serial Number &
Manufactured Date Label for all information (see page 2).
Model Name and Number: ______________________________
Serial Number: ________________________________________
Batch Number: ________________________________________
Date of Manufacture:___________________________________

6
Britax Child Safety, Inc.
Certification
This Restraint is Certified For Use in Motor Vehicles and
Aircraft�
Motor Vehicles
This child seat system conforms to all applicable Federal
motor vehicle safety standards (FMVSS 213).
Aircraft
This child seat is certified for aircraft use. The
FAA recommends that a child weighing up to
40 lbs (18 kg) use a certified, harnessed child
seat while traveling on an aircraft. Contact the
airline about their policy prior to traveling.
For rear-facing aircraft installation:
1. Recline this child seat (see page 25) and place rear-
facing on the aircraft seat.
2. Slide the aircraft lap belt into the
rear-facing belt slots over the cover
with the CLICKTIGHT in the closed
position.
3. Ensure the lap belt is not twisted,
buckle, and remove all slack.
For forward-facing aircraft
installation:
1. Place this child seat forward-facing on the aircraft seat in
the upright position.
2. Slide the aircraft lap belt into the
forward-facing belt slots under the
cover with the CLICKTIGHT in the
closed position.
3. Ensure the lap belt is not twisted,
buckle, and remove all slack.
NOTE: For further instructions on
securing your child and adjusting fit
see page 20.
– Install your child seat in a window seat to avoid
blocking the aisle.
– If the aircraft lap belt is too short, ask a flight attendant
for a belt extender.
– Your child may experience discomfort if the buckle
is located in the seating area of the child seat after
installation.
– Inflatable aircraft lap belts are not compatible with this
child seat.
– This seat may not fit all aircraft. Contact your airline
prior to travel to verify fit.

7
MARATHON CLICKTIGHT User Guide
Child Fit Information
Rear Facing: 5 – 40 lbs (2�3 – 18 kg)
Britax strongly recommends that children ride rear facing to
the highest weight or height specified.
Use rear facing:
• with harness straps in the closest
position at or below the child’s
shoulders and
• with children who weigh 5 – 40 lbs
(2.3 – 18 kg) and
• when the top of the child’s head is at
least 1 in. (2.5 cm) below the top of
the head pad.
Forward Facing: 20 – 65 lbs (9�1 – 29�4 kg)
Britax strongly recommends that children should be secured
with a harness system until they exceed the weight or height
limits specified.
Use forward facing:
• with harness straps in the closest
position at or above the child’s
shoulders, parallel to level ground and
• with children who weigh 20 – 65 lbs
(9.1 – 29.4 kg) and
• who are 49 in. (124.5 cm) or less in
height and
• when the top of the ears are below the top of the head
pad.
1 inch
2.5 cm
Shoulder
Level
Shoulder
Level

8
Britax Child Safety, Inc.
Rear-Facing Installation
Lap-Shoulder Belt Installation (Preferred Method)
1. Open the CLICKTIGHT.
a. Press the dimple on
the CLICKTIGHT
dial.
b. Rotate dial clockwise
until CLICKTIGHT
releases and lift to
open.
2. Attach the anti-rebound
bar, if included (see page
27).
3. Recline the unoccupied
child seat and place rear
facing on the vehicle seat.
Ensure that no more than
3 in. (7.6 cm) of the base
hangs over the edge
of the vehicle seat (see
pages 25-26).
4. Slide both the lap and
shoulder parts of the
vehicle belt into the rear-
facing belt slots.
5. Ensure the vehicle belt is
not twisted and buckle
the seat belt.
6. Remove slack from the
lap part (a), then the
shoulder part (b) of the
vehicle belt.
1b
1a
5b
5a
3”

9
MARATHON CLICKTIGHT User Guide
9Ensure that the logo on the CLICKTIGHT dial has
returned to a horizontal position.
9Ensure that the recline indicator ball is within the
allowable blue section for the size of the child and that
no more than 3 in. (7.6 cm) of the base hangs over the
edge of the vehicle seat (see pages 25- 26).
9Check that all connections are secure and straps are
not twisted.
9Check that the child seat cannot be moved front to
back or side to side more than 1 in. (2.5 cm) at the belt
path. If the child seat is not secure, repeat installation
or use a dierent seating location.
7. Close the CLICKTIGHT.
– A click confirms the
CLICKTIGHT is secure.
Rear-Facing Installation with Lap-Shoulder Belt

10
Britax Child Safety, Inc.
1. Open the CLICKTIGHT.
a. Press the dimple on
the CLICKTIGHT
dial.
b. Rotate dial clockwise
until CLICKTIGHT
releases and lift to
open.
2. Attach the anti-rebound
bar, if included (see page
27).
3. Recline the unoccupied
child seat and place
rear-facing on the vehicle
seat. Ensure that no more
than 3 in. (7.6 cm) of the
base hangs over the edge
of the vehicle seat (see
pages 25-26).
4. Remove the lower
connectors from the
storage compartment at
the rear of the seat and
pull the strap to full length
toward the child’s left
side.
5. Slide the lower connector
strap into the rear-facing
belt slots and firmly press
the lower connectors
over their adjacent lower
anchors.
– Verify that the
connectors are secure
and the strap is not
twisted.
Lower Anchor Installation
IMPORTANT: Do not install rear-facing with the lower
anchors for a child weighing more than 35 lbs (15.8 kg).
1b
1a
3”

11
MARATHON CLICKTIGHT User Guide
Rear-Facing Installation with Lower Anchors
6. Pull the end of the lower
connector strap to
remove slack.
7. Close the CLICKTIGHT.
– A click confirms the
CLICKTIGHT is secure.
9Ensure that the logo on the CLICKTIGHT dial has
returned to a horizontal position.
9Ensure that the recline indicator ball is within the
allowable blue section for the size of the child and that
no more than 3 in. (7.6 cm) of the base hangs over the
edge of the vehicle seat (see pages 25- 26).
9Check that all connections are secure and straps are
not twisted.
9Check that the child seat cannot be moved front to
back or side to side more than 1 in. (2.5 cm) at the belt
path. If the child seat is not secure, repeat installation
or use a dierent seating location.

12
Britax Child Safety, Inc.
Lap Belt Installation
1. Open the CLICKTIGHT.
a. Press the dimple on
the CLICKTIGHT
dial.
b. Rotate dial clockwise
until CLICKTIGHT
releases and lift to
open.
2. Attach the anti-rebound
bar, if included (see page
27).
3. Recline the unoccupied
child seat and place
rear-facing on the vehicle
seat. Ensure that no more
than 3 in. (7.6 cm) of the
base hangs over the edge
of the vehicle seat (see
pages 25-26).
4. Slide the vehicle belt into
the rear-facing belt slots.
5. Ensure the vehicle belt is
not twisted and buckle
the seat belt.
6. Lock and remove slack
from the vehicle belt.
NOTE: Ensure that the
vehicle belt is locked as
directed by your vehicle
owner’s manual.
1b
1a
3”

13
MARATHON CLICKTIGHT User Guide
7. Close the CLICKTIGHT.
– A click confirms the
CLICKTIGHT is secure.
9Ensure that the logo on the CLICKTIGHT dial has
returned to a horizontal position.
9Ensure that the recline indicator ball is within the
allowable blue section for the size of the child and that
no more than 3 in. (7.6 cm) of the base hangs over the
edge of the vehicle seat (see pages 25- 26).
9Check that all connections are secure and straps are
not twisted.
9Check that the child seat cannot be moved front to
back or side to side more than 1 in. (2.5 cm) at the belt
path. If the child seat is not secure, repeat installation
or use a dierent seating location.
Rear-Facing Installation with Lap Belt

14
Britax Child Safety, Inc.
Forward-Facing Installation
Lap-Shoulder Belt Installation (Preferred Method)
1. Remove the tether
from the tether storage
compartment and retainer
tabs and place it up and
over the child seat back.
2. Place upright forward-
facing on the vehicle seat .
Ensure that the base of
the child seat is flat on the
vehicle seat and no more
than 3 in. (7.6 cm) of the
base hangs over the edge
of the vehicle seat (see
pages 26).
3. Open the CLICKTIGHT.
a. Press the dimple on
the CLICKTIGHT
dial.
b. Rotate dial clockwise
until CLICKTIGHT
releases and lift to
open.
4. Slide both the lap and
shoulder parts of the
vehicle belt into the
forward-facing belt slots.
5. Ensure the vehicle belt is
not twisted and buckle
the seat belt.
6. Remove slack from the
lap part (a), then the
shoulder part (b) of the
vehicle belt.
3b
3a
6b
6a
3”

15
MARATHON CLICKTIGHT User Guide
7. Close the CLICKTIGHT.
– A click confirms the
CLICKTIGHT is secure .
8. Attach the tether to a
designated anchor (see
vehicle owner’s manual)
and remove slack (see
page 30).
Forward-Facing Installation with Lap-Shoulder Belt
9Ensure that the logo on the CLICKTIGHT dial has
returned to a horizontal position.
9Check that all connections are secure and straps are
not twisted.
9Ensure that the recline indicator ball is within the
allowable green section and that no more than 3 in.
(7.6 cm) of the base hangs over the edge of the vehicle
seat (see pages 25-26).
9Check that the child seat cannot be moved front to
back or side to side more than 1 in. (2.5 cm) at the belt
path. If the child seat is not secure, repeat installation
or use a dierent seating location.
9Check that any excess tether webbing is contained
within your vehicle and secured in the elastic strap.

16
Britax Child Safety, Inc.
Lower Anchor Installation
IMPORTANT: Do not install forward-facing with the lower
anchors for a child weighing more than 40 lbs (18 kg).
1. Remove the lower
connectors from the
storage compartment
at the rear of the seat
and pull the strap to
full length toward the
child’s left side.
2. Remove the tether
from the tether storage
compartment and retainer
tabs and place it up and
over the child seat back.
3. Place upright forward-
facing on the vehicle seat.
Ensure that the base of
the child seat is flat on the
vehicle seat and no more
than 3 in. (7.6 cm) of the
base hangs over the edge
of the vehicle seat (see
pages 26).
4. Open the CLICKTIGHT.
a. Press the dimple on
the CLICKTIGHT
dial.
b. Rotate dial clockwise
until CLICKTIGHT
releases and lift to
open.
5. Slide the lower connector
strap into the forward-
facing belt slots and
firmly press the lower
connectors over their
adjacent lower anchors.
– Verify that the
connectors are secure
and the strap is not
twisted.
6. Pull the end of the lower
connector strap to
remove slack.
4b
4a
3”

17
MARATHON CLICKTIGHT User Guide
7. Close the CLICKTIGHT.
– A click confirms the
CLICKTIGHT is secure .
8. Attach the tether to a
designated anchor (see
vehicle owner’s manual)
and remove slack (see
page 30).
Forward-Facing Installation with Lower Anchors
9Ensure that the logo on the CLICKTIGHT dial has
returned to a horizontal position.
9Check that all connections are secure and straps are
not twisted.
9Ensure that the recline indicator ball is within the
allowable green section and that no more than 3 in.
(7.6 cm) of the base hangs over the edge of the vehicle
seat (see pages 25-26).
9Check that the child seat cannot be moved front to
back or side to side more than 1 in. (2.5 cm) at the belt
path. If the child seat is not secure, repeat installation
or use a dierent seating location.
9Check that any excess tether webbing is contained
within your vehicle and secured in the elastic strap.

18
Britax Child Safety, Inc.
Lap Belt Installation
1. Remove the tether
from the tether storage
compartment and retainer
tabs and place it up and
over the child seat back.
2. Place upright forward-
facing on the vehicle seat.
Ensure that the base of
the child seat is flat on the
vehicle seat and no more
than 3 in. (7.6 cm) of the
base hangs over the edge
of the vehicle seat (see
pages 26).
3. Open the CLICKTIGHT.
a. Press the dimple on
the CLICKTIGHT
dial.
b. Rotate dial clockwise
until CLICKTIGHT
releases and lift to
open.
4. Slide the vehicle belt into
the forward-facing belt
slots.
5. Ensure the vehicle belt is
not twisted and buckle
the seat belt.
6. Push down into the
middle of the child seating
area with moderate
force (approximately
45 lbs/20.4 kg),
compressing the vehicle
seat while tightening the
vehicle belt.
NOTE: Ensure that the
vehicle belt is locked as
directed by your vehicle
owner’s manual.
3b
3a
3”