Cosco MIGHTY FIT 65 User manual

FUNSMARTSIMPLE
MIGHTY FIT 65
MIGHTY FIT 65 DX, LX
CONVERTIBLE CAR SEAT
KEEP INSTRUCTIONS FOR FUTURE USE.
Read all instructions before using this car seat.
WARNING: Failure to follow the warnings on the labels
and in the instruction manual can result in serious injury
or death to your child.
To see installation videos,
scan the QR Code or
visit www.coscokids.com.
4358-7784
5.14.19

Quick NavigationOverview
Welcome to the Cosco family and thank you for choosing this car
seat, also known as a child restraint!
To help you get started using your child’s new car seat, here are the
4 main tasks you’ll need to complete.
Your child’s safety is worth the time it will take to read and follow
these instructions.
Ready? Let’s go!
Pages 1-4 will introduce you to the parts of the car seat.
Page 66 has our contact information. If at any point you would like
assistance, please feel free to reach out to us.
REAR-FACING
5-40 lb (2.3-18 kg)
and 19-40 in.
(48-101.6 cm)
PAGE 5
Rear-Facing
Child Fit
PAGE 8
Forward-
Facing
Child Fit
PAGE 9
Adjusting
Car Seat
PAGES 10-18
Securing
Child
PAGE 48
Vehicle
Belt
PAGE 28
Lower
Anchor
PAGE 33
Vehicle
Belt +
Tether
PAGE 39
Lower
Anchor
+ Tether
PAGE 43
FORWARD-FACING
22-65 lb (10.1-29 kg)
and 29-49 in.
(73.6-125 cm)
And at least 1 year old
PAGE 5
Adjust the Car Seat to Fit Your Child
Measure Your Child
Install the Car Seat into Your Vehicle
Secure Your Child in the Car Seat
Adjusting
Car Seat
PAGES 10-18

Getting Started
Parts of the Car Seat .......................................................1
Accessory Use ...............................................................3
Choosing Car Seat Mode ...............................................4
Preparing Car Seat for Child Fit.........................................6
Rear-Facing Child Fit ......................................................8
Forward-Facing Child Fit........................................................9
Making Adjustments to Car Seat
Changing Harness Height and Headrest Height ............10
Changing Buckle Position...............................................13
Harness System Adjustments for Smaller Infants.............15
Reclining the Car Seat ....................................................18
Choosing LATCH or Vehicle Belt
LATCH: Lower Anchor Use ..............................................19
Vehicle Belts ..................................................................21
Tether Use ......................................................................25
Installation in Vehicle
Rear-Facing Mode .........................................................27
Rear-Facing Vehicle Belt Install........................................28
Rear-Facing LATCH: Lower Anchor Install ........................33
Forward-Facing Mode ...................................................38
Forward-Facing Vehicle Belt + Tether Install....................39
Forward-Facing LATCH: Lower Anchor + Tether Install.....43
Securing Child in Car Seat...................................48
Car Seat Pad Use and Care
Removing Harness System ...............................................51
Removing Seat Pad Set for Cleaning .................................53
Installing Harness System.................................................55
Safety Information
Aircraft Information ......................................................59
Replacement and Expiration of Car Seat ........................60
Child Restraint Use...........................................................61
Installation in Vehicle........................................................61
Vehicle Seating Position ...................................................62
Registration and Safety Notices.........................................63
Additional Information
Warranty .........................................................................64
Troubleshooting ...............................................................64
Replacement Parts List ....................................................65
Dorel Juvenile Group Information.......................................66
©2019 Dorel Juvenile. All Rights Resevered.
Contents

2
Parts of the Car Seat
1
Harness
Release
Lever
(through
opening in
pad)
Harness
Adjustment
Strap
Shoulder
Harness Slots
Chest Clip
Harness System Detail
Forward-
Facing
Belt Path
Rear-Facing
Level Lines
Recline Stand
Rear-Facing Belt Path
Adjustable
Headrest
Headrest
Adjustment
Bar
Tether Strap
Tether Storage Instruction
Manual
Storage
*See page 3 for Accessory Use. *See page 3 for Accessory Use.
Buckle
Slots
LATCH:
Lower
Anchor
Belt
Cup
Holder*
Buckle
LATCH: Lower Anchor
Belt Storage
LATCH:
Lower
Anchor Belt
Storage
LATCH:
Lower
Anchor Belt
Storage
Harness
Straps
Splitter Plate
Shell
(child restaint)

Accessory Use
3 4
Cup Holder
(on select models)
Pull pad off corner.
Hook bottom of cup holder to edge of
shell.
Rotate cup holder up until it snaps into the
hole on the shell.
Replace pad.
The cup holder can go on either side of
the child restraint.
The removable cupholder is top-rack
dishwasher safe.
For Use in Rear-Facing
or Forward-Facing Mode
For Use in Rear-Facing Mode Only
Lumbar Support
(on select models)
The lumbar support provides extra
comfort for your child.
To remove the lumbar support, slide out
from behind the harness straps.
Choosing Car Seat Mode
Measure your child’s weight and height
(do not guess) before choosing the car seat’s mode.
Your child’s height, weight, and age determine how the car seat should
be placed in the vehicle.
Children vary widely in body size, shape, and temperament—please
consult your doctor before switching between any of these
modes within the limits and fit requirements of the seat.
State Laws
Please be certain to follow your state’s laws regarding car seat use.
American Academy of Pediatrics Recommendations
Infants and Toddlers
Should ride in a rear-facing car seat as long as possible, until they
reach the highest weight or height allowed by their seat.
Toddlers and Preschoolers
Once they are facing forward, children should use a forward-facing car
seat with a harness for as long as possible, until they reach the height
and weight limits for their seats.
School-Aged Children
Once they have outgrown their forward-facing car seat, children should
use a belt-positioning booster seat until the vehicle’s lap and shoulder
seat belt fits properly. This is often when they have reached at least 4
feet 9 inches in height and are 8 to 12 years old.
Older Children
All children younger than 13 years should be restrained in the rear
seats of vehicles for optimal protection.
continued on next page

continued on next page
Preparing Car Seat for Child Fit 65
Adjust the Headrest to
the Highest Position
Squeeze the headrest adjust-
ment bar on the back of the
seat towards you.
Slide the headrest all the way
up to expose all of the shoulder
harness slots.
Make sure it locks into place.
Fully Loosen Harness
Straps
Push down on harness release
lever (through opening in pad)
while pulling out on harness
straps as shown.
1
2
FORWARD-FACING MODE
22-65 lb (10.1-29 kg) and 29-49 in. (73.6-125 cm)
Children must be at least 1 year of age to ride Forward-Facing.
In this car seat, your child can remain harnessed Forward-Facing
until they outgrow any one of the following:
• Weight Limit: 65 lb (29 kg); OR
• Height Limit: 49 in. (125 cm); OR
• Forward-Facing Child Fit requirements, see page 9
REAR-FACING MODE
5-40 lb (2.3-18 kg) and 19-40 in. (48-101.6 cm)
Children under 1 year of age must ride Rear-Facing.
In this car seat, your child can remain Rear-Facing until
they outgrow any one of the following:
• Weight Limit: 40 lb (18 kg); OR
• Height Limit: 40 in. (101.6 cm); OR
• Rear-Facing Child Fit requirements, see page 8

Rear-Facing Child Fit 87
Place Child in Car Seat
to Determine Proper
Harness Fit
The child’s bottom and back
should be flat against the
car seat.
For Rear-Facing child fit, see page 8.
For Forward-Facing child fit, see page 9.
Need to make adjustments?
To change headrest/harness height, see pages 10-12.
To change buckle position, see pages 13-14.
Harness Strap Position
The harness strap must be at or
slightly below the shoulders;
never above.
Buckle Position
Buckle must be used in either the 1st
or 2nd slot. Choose the slot closest
to your child.
The buckle should not be
underneath or behind your child.
Head Position
The top of your child’s head
must be at least 2.5 cm
(1 in.) below the top of the
car seat’s headrest.
1
2
Do not use 3rd slot in
Rear-Facing mode.
Release Chest Clip
Hold each side of the chest clip
and press on the release button
with your thumb and pull apart.
3
4
5
Release
Button
Buckle
Tongue
Unbuckle Harness
Press the red button in to release
the buckle tongues.

continued on next page
Changing Harness Height
and Headrest Height 10
Forward-Facing Child Fit
9
Need to make adjustments?
To change headrest/harness height, see pages 10-12.
To change buckle position, see pages 13-14.
Harness Strap Position
The harness strap must be at or
slightly above the shoulders;
never below.
Buckle Position
Buckle can be used in any slot. Choose
the slot closest to your child.
The buckle should not be
underneath or behind your child.
Head Position
The tops of your child’s ears
must be below the top of the
car seat’s headrest.
1
2
3
Max Seated Shoulder Height
In this car seat, the maximum seated
shoulder height is 16.5 in. (42 cm).
To measure your child’s seated
shoulder height: have them sit on the
floor with their back flat against a wall.
Then measure from the floor up to the
top of their shoulder.
Max Seated
Height
16.5 in
(42 cm)
Fully Loosen Harness
Straps
Push down on harness release
lever (through opening in pad) while
pulling out on harness straps as
shown.
From Back of Seat,
Remove Harness Strap
Loops From Splitter Plate
Pull Harness Strap Out
of Shoulder Harness Slots
1
2
3
Rethread Harness Strap
Into Correct Shoulder
Harness Slots For Your
Child
4
For Rear-Facing child fit,
see page 8.
For Forward-Facing child fit,
see page 9.

1211
Attach 1st Harness Strap
Loops to Splitter Plate As
Shown
Sewn ends of the harness strap
loops must face towards you. Do
not twist harness strap or harness
adjustment strap.
Make sure the same harness
strap loops are fitted completely
on both sides of the splitter plate.
Harness strap loop ends must
go through the recline stand as
shown.
Harness adjustment strap must
lie under the harness strap as
shown.
From the Back of Seat,
Pull Harness Strap
Through Pad and Shell
Harness strap must be under the
headrest adjustment bar as shown.
Do not twist harness strap.
sewn
end
5
6
7Place Child in Child
Restraint to Determine
Headrest Position
For Rear-Facing child fit,
see page 8.
For Forward-Facing child
fit, see page 9.
8Adjust the Headrest
Squeeze the headrest
adjustment bar on the back of
the seat towards you.
Raise or lower the headrest to
position it behind your child’s
head.
Make sure the metal bar is
locked into position and above
the harness strap.
WARNINGS: The harness system must be installed
correctly. Do not use a child restraint with damaged
harness straps.
Recline Stand
Harness Adjustment
Strap
Check your child’s fit often.
If you cannot achieve a snug harness fit for your child,
see pages 15-17.
To learn how to check harness tightness, see pages 48-50.
Check the harness straps often for any wear or damage.

1413
Unbuckle Harness
Press in on the red button.
Pull buckle tongues out.
Turn Seat Over
Locate buckle’s metal retainer on
bottom of shell.
Rotate Metal Retainer and
Push It Up Through Shell
and Pad
1
2
3
Buckle
Tongue
4From Top of Seat, Pull
Buckle Out of Shell
and Pad
Changing Buckle Position
WARNING: Failure to place buckle’s metal retainer
completely through pad and shell can result in serious
injury or death.
Insert Buckle’s Metal
Retainer into Slot
Closest to Child
Buckle must face out.
Rear-Facing Mode:
You must use the 1st or 2nd buckle
slots.
Forward-Facing Mode:
Any slot can be used.
Pull Metal Retainer
Completely Through
Pad and Shell
Check Buckle
Pull up on buckle to make sure it is
secured.
The buckle must not pull out.
Check your child’s fit often.
1
2
3
5
6
7

Harness System Adjustments
for Smaller Infants
15
continued on next page
16
With Buckle in the
1st Slot As Shown,
Turn the Seat Over
If you need to move the buckle
to the 1st slot, see pages 13-14.
Release Elastic Straps
From Tabs on Bottom of
Shell and Pull Seat Pad
Off the Front of the Shell
1
2
sewn
end
1
2
From Back of Seat,
Remove Harness Strap Loops
From Splitter Plate
Attach 2nd Harness Strap
Loops to Splitter Plate As
Shown
Sewn ends of the harness strap loops
must face towards you.
Do not twist harness strap or harness
adjustment strap.
Make sure the same harness strap
loops are fitted completely on both
sides of the splitter plate.
Harness strap loop ends must go
through the recline stand as shown.
Harness adjustment strap must lie
under the harness strap as shown.
Check your child’s fit often.
To learn how to check harness
tightness, see pages 48-50.
If you cannot achieve a snug harness fit for your child, you may
need to adjust the harness strap and/or buckle strap length as
shown in this section.
Adjusting Harness Strap
Adjusting Buckle Strap
Recline Stand
Harness Adjustment
Strap

17 Reclining the Car Seat 18
This car seat has 2 positions.
For Upright: Pull recline
stand out from under seat
and push up to lock in
place.
To Recline: Pull down to
unlock recline stand and
fold under seat.
Rear-Facing Mode -1Reclined
For children between 5-22 lb
(2.3-10 kg), the bottom level line on
shell must be parallel with the ground.
For children 22-40 lb (10-18 kg) who
can sit up unassisted, rotate the child
restraint between the 2 level lines.
Forward-Facing Mode - 2 Upright
1
2
Upright
Recline
How to Change Positions
WARNINGS: The harness system must be installed
correctly. Do not use a child restraint with damaged
harness straps.
Replace Pad and
Check Buckle
Pull up on buckle to make sure it is
secured.
The buckle must not pull out.
Check your child’s fit often.
To learn how to check harness
tightness, see pages 48-50.
From Bottom of Seat,
Pull Metal Retainer
Towards You and Push
It Up into Middle Slot
As Shown
From Top of Seat,
Lay the Metal Retainer Flat
Against the Shell As Shown
3
4
5

Lower Anchor
Hooks
Adjuster
20
LATCH: Lower Anchor Use
19
Vehicle
Seat
Bight
Lower Anchor
Bars
For Use in Rear-Facing
or Forward-Facing Mode
Lower Anchor
Belt Storage Location
Lower Anchor
Belt Storage
Location
Lower Anchor
Belt Parts
To Remove Lower Anchor Belt from Storage Location
on Car Seat: Squeeze spring lever on hooks and remove hooks
from storage attachments.
To Remove Lower Anchor Belt from
Vehicle Anchor Bars:
Remove tension from the belt by pushing
down on side of child restraint with the belt
adjuster. Then press the adjuster button to
loosen belt.
Unhook from anchor by squeezing spring
lever on hook, pushing hook back into the
seat bight, and twisting. Then pull it out of the
vehicle seat.
To Store Lower Anchor Belt:
When using vehicle belts or when the car
seat is not installed in a vehicle, the lower
anchor belt must be properly stored in its
storage location.
Thread lower anchor belt through forward-
facing belt path. Then attach hooks to attach-
ments behind pad as shown.
Gently tighten to remove slack.
Your vehicle’s features may be considerably different
than those pictured here.
The lower anchors of LATCH (Lower Anchors and Tethers for
CHildren) is a universal system for installing child restraints without
using vehicle seat belts.
The lower anchor can ONLY be used in vehicles that have the lower
anchor bars installed in designated seating positions.
Most vehicles manufactured after September 2002 are equipped
with lower anchor bars.
Check your vehicle owner’s manual to see which seating positions
may be equipped with LATCH: lower anchor bars.
WARNINGS
Do not use both the lower anchor belt and vehicle belt at the
same time.
When used correctly the lower anchor belt or vehicle belts
are equally safe.

continued on next page
22
Vehicle Belts
21
Your vehicle’s features may be considerably different
than those pictured here.
If lower anchors are not an option or if your child weighs more
than 40 lb (18 kg), you must use the vehicle seat belt system to
install the child restraint.
Not all vehicle belts and seating positions will work with
child restraints.
Please go through the following steps to understand how
to lock a child restraint in Rear-Facing or Forward-Facing
mode with a vehicle belt.
Lap/Shoulder Belts
You MUST Review Your
Vehicle Owner’s Manual
Your vehicle owner’s manual will let
you know which vehicle belts and
seating positions child restraints
can be installed in.
1
Determine How the Child
Restraint Will Be Locked
Into Place
The vehicle belt must not loosen after
tightening. This means there needs to be
a way to lock the vehicle belt.
The ways this can be done are:
• By using the seat belt’s retractor (see step 3); OR
• By using the seat belt’s latch plate (see step 4).
2
3Check the Retractor
Retractors pull seat belts into stored
positions and lock the belt to hold
passengers in place.
See the next page for some common
types of vehicle belt retractors that will
work with this child restraint.

2423
Automatic Locking Retractor
Emergency Locking Retractor
This retractor always locks.
It will automatically lock after slowly pulling the seat belt out at least
halfway and letting the belt go back into the retractor an inch or two.
If the retractor does not lock, it is most likely an Emergency Locking
Retractor. These retractors only lock during a sudden stop or collision.
You will need to determine if your seat belt’s latch plate can lock the
belt. See Step 4, “Check the Latch Plates”.
See Step 4, “Check
the Latch Plates”.
Switchable Retractor
(most vehicles have this type)
This retractor can be switched to a locking mode.
You must have the retractor in the locking mode to use the seat
belt with this child restraint.
Switching to locking mode: Slowly pull the shoulder belt all the way
out, then let it go back in an inch or two.
As it goes back in, you will most likely hear a ratcheting sound.
Gently pull the belt to see if it has locked. You will not be able to pull
any more belt out if the lock has engaged.
Types of Retractors
Locking Latch Plate
Emergency Locking
Retractor with a
Sliding Latch Plate
Emergency Locking Retractor Lap Only Belt
Inflatable Seat Belts
Never Use With This Child Restraint
4Check the Latch Plates
Latch plates are the part of
the seat belt that goes into the
buckle.
To see if the latch plate locks:
Buckle the vehicle belt.
Then firmly tug the lap portion of the seat
belt while pulling it up.
If the vehicle belt does not slide through
the latch plate, it’s locked.
If the latch plate slides up and down the
vehicle belt, it is a sliding latch plate.
Sliding latch plates easily slip between
the lap and shoulder portions of the belt.
If you have an Emergency Locking
Retractor with a Sliding Latch Plate,
you must use a locking clip.
Please contact us for one. See page 65.

26
Tether Use
25
Your vehicle’s features may be considerably different
than those pictured here.
You must always attach, adjust, and secure the top anchorage
(tether) strap when installing the child restraint forward-facing
with internal harness. Tethers improve the installation and stability
of child restraints and reduce the risk of injury.
Attach the tether hook to the tether anchor designated by your
vehicle manufacturer for that seating position. Check your vehicle
owner’s manual for more information.
If the seating position does not have a tether anchor, use a different
seating position or see your dealer or a qualified mechanic and
have one installed.
WARNINGS
Using this child restraint without the tether strap anchored as
recommended by the manufacturer would be a misuse of the
child restraint and, in a sudden stop or crash, could result in
serious injury or death.
Do not fasten multiple tether hooks on the same tether anchor
in the vehicle.
For Forward-Facing Mode Only
Tether Anchors
Adjusting Tether Strap
To tighten: After the child
restraint is locked into place with
the lower anchor belt or vehicle
belt, push down on child restraint
and gently pull on free end of
tether strap.
To loosen: Lift up on tether
adjuster and push it towards
tether hook.
Pull free end of
belt to tighten
Lift adjuster up
to loosen
Storing Tether Strap
When installing rear-facing or
when the car seat is not installed
in a vehicle, attach the tether hook
to its storage attachment on back of
car seat as shown.
Gently tighten to remove slack.
Adjuster
Strap
Hook Storage
Location
Tether Storage
and Parts

continued on next page
Rear-Facing Vehicle Belt Install 28 Rear-Facing Mode
27
WARNINGS
Never install a rear-facing child restraint in the
front seat of a vehicle equipped with an active
frontal airbag.
Do not use the tether for rear-facing mode.
Secure tether strap to its storage location.
Do not use the lower anchor belt along with the
vehicle lap or lap/shoulder belt.
Check the vehicle belt or the lower anchor belt
before each use. Use only if the belt can be tight-
ened properly and locked securely in place.
Do not fasten multiple lower anchor hooks on the same lower
anchor bar in the vehicle.
This child restraint MUST always face the rear of the vehicle until
the child is at least 1 year old and weighs 22 lb (10 kg).
Failure to follow these warnings can result in serious injury or
death.
Before you begin installing the seat
into your vehicle, did you check:
Your child’s weight and height?
5-40 lb (2.3-18 kg) and
19-40 in. (48-101.6 cm)
Your child’s fit? See page 8.
Do you need to make adjustments to the
harness/headrest height or the buckle position?
5-40 lb (2.3-18 kg) and
19-40 in. (48-101.6 cm)
Lap/Shoulder
Belt
Lap Belt LATCH: Lower
Anchor Belt
1Pull Down Recline Stand to
Unlock and Fold It Under
Child Restraint
Loosely attach the tether hook to
storage location before folding recline
stand.
Fold recline stand and then gently
tighten tether strap to remove slack.

continued on next page
3029
Locate Rear-Facing Belt Path
Route the Vehicle Belt
Thread the vehicle belt into the Rear-
Facing Belt Path opening.
Pull it across the seat, under the seat
pad, in front of the buckle, and out
through the other belt path opening.
Do not twist belt.
Check Rear-Facing Level
Lines
For children between 5-22 lb
(2.3-10 kg), the bottom level line on
shell must be parallel with the ground.
For children 22-40 lb (10-18 kg)
who can sit up unassisted, rotate
the child restraint between the 2 level
lines.
Start by making the bottom level line
parallel with the ground, then rotate
seat up. Do not rotate past the top
level line.
Check if Your Vehicle Belts
Will Work With This Child
Restraint
This is very important because not
all vehicle belts will work with child
restraints.
Review pages 21-24 and your vehicle
owner’s manual to determine what
kind of vehicle belt you have and how
to lock a child restraint in place.
3
4
5
6
1
2
Place Car Seat Rear-Facing
in Back Seat
2

3231
Finished!
Check the tightness of the
install often to make sure it
has not loosened.
Recheck Rear-Facing Level
Lines
Redo the installation if the child
restraint is not reclined according to
your child’s weight.
NOTE: You may need to place a tightly
rolled towel(s) or foam pool noodle(s)
under the front of the child restraint to
help achieve the correct recline. Check
often to be sure padding is still in place
and the belt is tight.
Secure Child in Car Seat
To properly secure your child in the car
seat, see pages 48-50.
Check your child’s fit often and make
any needed adjustments to the car seat
as they grow.
If it moves more than 1 in. (2.5 cm), you can try:
A. Pulling the belt tighter.
B. Reinstalling the child restraint.
C. Changing to a different seating location.
D. Switching to lower anchor belt installation if lower anchors are
available in your vehicle.
10
11
Check Belt Tightness
Hold child restraint at the belt path with
your weaker hand. Push and pull from
side to side. It should not move more
than 1 in. (2.5 cm).
9
Tighten Belt
Place hand in child restraint.
Firmly push child restraint down and
back towards the vehicle seat back
while pulling the shoulder belt or the
free end of lap belt parallel with the belt
path through the belt path opening as
shown.
8
Buckle the Vehicle Belt
7

Rear-Facing LATCH:
Lower Anchor Install
33
continued on next page
34
Release Elastic Straps From
Tabs on Bottom of Shell and
Pull Seat Pad Off the Front of
the Shell
Before you begin installing the seat
into your vehicle, did you check:
Your child’s weight and height?
5-40 lb (2.3-18 kg) and
19-40 in. (48-101.6 cm)
Your child’s fit? See page 8.
Do you need to make adjustments to the
harness/headrest height or the buckle position?
Remove Lower Anchor Belt
from Storage Location
Or if the lower anchor belt was used
Forward-Facing, remove it from the
Forward-Facing belt path so both hooks
are on the same side of the seat.
1
2
Locate Rear-Facing Belt Path
Route the lower anchor hook through
the Rear-Facing Belt Path opening as
shown.
The lower anchor belt adjuster can be
on either side of the car seat.
Pull Lower Anchor Belt
Across the Seat
It must be under the seat pad, in front
of the buckle, and go out through the
other belt path opening.
Do not twist belt.
Finished Lower Anchor
Belt Routing
1
2
3
4
5
6Pull Down Recline Stand to
Unlock and Fold It Under Child
Restraint
Loosely attach the tether hook to
storage location before folding recline
stand.
Fold recline stand and then gently
tighten tether strap to remove slack.
Adjuster