Costco Back-in-Motion 790842 User manual

Costco Model #: 790842
B A C K - I N - M O T I O N ™ M I D B A C K C H A I R
1. To Adjust Seat Height:
While seated, lean forward and reach under the
right side of the chair to find the handle. Lift the
handle and raise your body up slightly to allow the
chair to rise to the desired height. Once desired
height is reached, release handle to lock chair at
desired height. To lower the seat, lift the handle
while seated. The chair will descend until the
handle is released or the chair reaches the bottom
position.
2. To Operate Tilt Lockout:
While seated, reach under the left side of the chair
to find the handle. Push down the handle and lean
back to allow the chair to tilt backwards. To lock the
chair in the upright or vertical position, sit upright
and pull the handle to the up position.
3. To Adjust Tension On The Tilt:
Do not sit in the chair while adjusting the tilt tension
knob. While out of the chair, facing the front of the
seat, reach under the seat and locate the tilt
tension knob. Turn the knob counter- clockwise to
stiffen the tilt mechanism. Turn the knob clockwise
to loosen the tilt mechanism. Rotate the knob until
the desired resistance is reached.
4. To Adjust Arm Height:
Press the buttons on the chair arms. Press the
buttons to allow the arms to move up or down freely
then release the buttons once the desired height is
reached.
5. About The Back In Motion:
While seated, the seat and lumbar are fixed
together on a tilting axis that allows you to rotate
your pelvis while flexing the muscles of the core. It
is designed to allow you to articulate the spine and
perform pelvic tilt exercise.
* Note: Before placing your full weight onto the chair, ensure you are fully positioned against the back cushion and
not sitting on the front edge of the seat, as the front edge is designed to tilt forward. Failure to sit in the chair
properly may result in a fall.
Please check to ensure that you have received all the parts for the assembly of this chair. If you find any
missing or damaged parts, do not return to the store. Please call toll free at 1-855-372-2315 for assistance.
Service hours are: Pacific Time: 6:00 am-5:00 pm Monday – Friday. Please note that a receipt is required for
all warranty replacements. This chair has been tested and approved for normal use which is defined as a
standard work week of forty hours by a person weighing less than 250lbs (113kg).
OPERATING INSTRUCTIONS
Important Safety Information:
As this chair is designed to allow you to perform
pelvic tilt exercises:
• If you are pregnant, have any medical conditions,
including previous back and/or body pain, consult your
physician prior to using this chair.
• If you are using this product and begin to experience any
pain and/or discomfort consult your physician before
continued use this chair.
• This product is not intended to treat any medical
condition. It is intended to provide users with additional
comfort, ease of use, and less strain on the back when
seated in the chair for extended periods of time. This chair
does not make any claims to cure or treat any medical
condition.

Costco Model #: 790842
B A C K - I N - M O T I O N ™ M I D B A C K C H A I R
A. Remove all parts from carton and separate them into part number groups as indicated in parts list.
B. To begin assembly, place 5 Star Base (2) upside down and insert Casters (1) into bottom of Base (2).
C. Turn Base (2) right side up on the floor and insert Gas Lift (3) into center hole on Base (2).
D. Place Telescoping Cover (4) over the Gas Lift (3) and rest it on the Base (2).
E. Align the Lumbar Cushion (8) with the Seat Cushion (7) by positioning the Lumbar Cushion (8) between the Seat Cushion (7)
and the Back Support Plate (10), attach by using 1” Small Screws (14) as shown in Diagram 1. Tighten screws completely.
F. Attach Seat Plate (5) to the bottom of the Seat Cushion (7) (with the FRONT of seat plate facing the FRONT of seat cushion).
Attach by using 1-1/4” Big Screws (12) for the front holes of the Seat Plate (5) and 1” Big Screws (13) for the rear holes of the
Seat Plate (5) as shown in Diagram 2. Tighten screws completely.
G. Align Handles (H1 & H2) of Seat Plate (5) over pre-drilled holes on the left and right on the underside of Seat Cushion (7),
attach the Handles (H1 & H2) to both sides of Seat Cushion (7) by using 1” Small Screws (14) as shown in Diagram 3. Tighten
the screws completely. Fix the cable for the seat plate into the plastic clips attached to the bottom of the seat
cushion.
H. Attach the Arms (6A & 6B) to the bottom of the Seat Cushion (7) (with the FRONT of arms facing the FRONT of seat cushion)
by using 1” Small Screws (14) in the arm holes as shown in Diagram 4. Tighten screws completely.
I. Attach the Back Support Plate (11) to the Seat Cushion (7) using 1-1/4” Big Screws (12) as shown in Diagram 5 and tighten
screws.
J. Place the assembled chair on top of Gas Lift (3) and press down until fully engaged.
K. Periodically (every 90 days) make sure that the screws are still fully tightened.
ATTENTION: Be certain that all screws are fully tightened before using chair.
Part # Description Quantity
1.
2.
3.
4.
5.
6A.
6B.
7.
8.
9.
10.
11.
12.
13.
14.
15.
H1.
H2.
Casters
5 Star Base
Gas Lift
Telescoping Cover
Seat Plate
Left Arm
Right Arm
Seat Cushion
Lumbar Cushion
Back Cushion
Back Support Plate(already
attached to the seat cushion)
Back Support Plate(already
attached to the back cushion)
1-1/4” Big Screws
1” Big Screws
1” Small Screws
Allen Keys
Right Handle
Left Handle
5
1
1
1
1
1
1
1
1
1
1
1
6
2
15
2
1
1
A S S E M B L Y I N S T R U C T I O N S
P A R T S L I S T