Okamura Choral User manual

G1A740
2018-05
INTERNATIONALSALES&MARKETINGDIVISION
2-14-27,Akasaka,Minato-ku,Tokyo107-0052,JAPAN
Tel:[phone]Fax:[phone]
http:
//
www . okamura.jp
/
OKAMURACORPORATION
Instructions for Use
Office Seating

1 2
Caution
Safety Instruction (Keep this operation manual)
Gas lift
Hard casterSoft caster
Symbol indications
Various symbol marks are used in this instruction manual and displayed on the products to show correct
and safe usage and to avoid harm to you and others or damage to property. Please understand those before
reading the main text of this manual.
Caution
User must follow this instruction to prevent from accidents and injuries, or
damages to their property.
 Do not handle roughly, or use improperly.
Do not use as a carrier.
 Do not disassemble or repair on your own. Please contact
our official dealers when needed.
 No remodeling. Okamura will have no responsibility for any
disadvantage caused by remodeling.
 Gas lift replacement and handling should only be carried out
by the trained personnel.
 Be careful not to put fingers, hands or clothes caught in gaps
between moving parts or under armpad when adjusting the
armrest position.
 Casters
For hard floors made of ceramic, stone, tile or wood, use soft
casters.
For soft floors using carpet or rug, use hard casters.
 Adjustable arm
Be careful not to get your fingers, hand or clothes caught in the
gaps between the moving parts or the back of the pad when
adjusting the position of the arm. Also, make sure that the arms
are fixed tightly before use.
Do not stand on the chair or sit on the front side of
seat or armrest.

3 4
Installation
For maintenance
When placing alongside windows, use curtain or blind to avoid from
direct sunlight.
Please follow instructions below. Failure may cause serious damage to the product.
 Regular maintenance is tips for long-life use.
 If found unstable due to loose bolts and screws, tighten them.
 For daily care, use a well-wrung soft cloth.
 For stained part, use neutral detergent (1-3%) and completely remove
detergent with dry soft cloth.
 For mesh and cushion parts, remove dust by tapping the cloth surface
with brush or using vacuum cleaner.
 Cushion part cannot be dry-cleaned so that replacing is recommended if
exceptionally dirty.
Indoor use only.
Avoid direct sunlight.
No outdoor or waterfront use.
Avoid high temperature, high humidity, or extraordinary aridity.
Do not place product under heater or air-conditioner exhausting high
temperature air.
Do not place on uneven floor.

65
Part names Adjustable range
Headrest (option)
Backrest
Hanger (option)
Adjustable arm
(option)
Reclining lock/release lever
A
rm height
adjustment button
Lumbar support
adjustment tab
Backrest frame
Reclining tension
adjustment lever
Seat slide lever
Seat
Leg
Lumbar support
(option)
Gas lift
Caster
Seat height
adjustment lever
mm (inch)
100mm
(4”)
120mm
(4 3/4”)
23°
35°
100mm
(4”)
70mm
70mm
(2 3/4”)
(2 3/4”)
50mm
(2”)
110mm
(4 3/8”)

7 8
Operation guide
50mm
(2”)
Seat height adjustment
Adjust the seat height using the seat height adjustment
lever on the bottom right of the seat. The seat will be
lowered if you lift the lever while seated, and it will stop
at any position you release the lever at. The seat will be
raised if you lift the lever while not seated on the seat.
110mm
(4 3/8”)
mm (inch)
Seat depth adjustment
Adjust the seat depth by sliding the seat forward or
back within a range of 50 mm (2”) using the seat
slide lever on the bottom left of the seat. This allows
for maintaining an appropriate distance between
the back and the front edge of the seat, reducing
pressure on the back of the knees and providing
reliable support for the lower back.
mm (inch)

910
Operation guide
23°
+–
Reclining adjustment
Adjust the backrest recline using the reclining lock/
release lever on the bottom left of the seat. Click the
lever in the tilted position to lock reclining. To release
the lock, click the lever once again. When releasing the
lock, slightly lean against the backrest.
Reclining tension adjustment
Adjust the reclining tension by using the reclining
tension adjustment lever on the bottom right of the
seat. The tension to the backrest will be increased if
you slide the lever back (+), and the tension will be
decreased if you slide the lever forward (-). Adjust it
so that it is comfortable.
To operate, verify that the reclining lock is
released, and move your back away from the
backrest before using the reclining tension
adjustment lever. The lever will not move when
reclining is locked.
Note

11 12
Operation guide
10°
25mm
(1”)
100mm
(4”)
20°
20°20°
50mm
50mm
(2”)
(2”)
50mm
(2”)
70mm
70mm
(2 3/4”)
(2 3/4”)
70mm
(2 3/4”)
Adjustable arm height adjustment
(only for models with moveable arms)
Push the arm height adjustment button on the bottom
of the arm pad. The arm height can be adjusted up
and down within a range of 100 mm (4”) by pushing
and holding the button. Lock again by releasing the
button. Holding the arm pads and rotating them
left and right allows for adjustment of their angles
(20°inside, 10°outside). They can also be adjusted
forward and back within a range of 50 mm (2”), or left
and right within a range of 25mm (1”).
Note
Before using this product, make sure that the position
is securely locked after making the adjustment.
mm (inch)
Adjusting Lumbar support (option)
(only for models with lumbar support)
Adjust the height of the lumbar support by using the
lumbar support adjustment tab on both sides of the
backrest. The Lumbar support can be moved up
and down within a range of 70 mm (2 3/4”).
mm (inch)

13 14
Operation guide
120mm
(4 3/4”)
100mm
(4”)
35°
Hanger (option) height adjustment
Adjust the hanger by pushing the button. The hanger
can be moved up and down within a range of 120
mm (4 3/4”). The hanger can also be set in a position
where it is out of the way when not in use, allowing for
a clean appearance.
Headrest (option) height adjustment
Adjust the headrest height by pulling the main part
of the headrest. The headrest can be moved up
and down within a range of 100 mm (4”), and the
angle can be adjusted to a comfortable position
within a range of 35° by moving the main part of the
headrest forward.
mm (inch) mm (inch)

15 16
Part attachment and replacement
Adjustable arm (option) / Design arm (option)
attachment and replacement
(1) Remove the covers on the frame by using a flathead
screwdriver or other appropriate tool.
(2) Attach the arms to the frame arm attachment locations by
using hexagon sockets screws.
Tools: 6mm hexagonal wrench (Allen wrench)
Headrest (option) attachment and replacement
(1) Attach the headrest on the backside of the backrest by
securing it with fastening bolts.
(2) Attach the cover on the attachment by using the tabs.
Make sure that the Headrest is secured completely before
using.
Headrest
Cover
Tab
Fastening
bolt
Backrest
(1)
(2)
[Adjustable arm]
Frame
Cover Hexagon
socket screws
(1)
(2)
Cover Hexagon
socket screws
[Design arm]
Frame
Hanger (option) attachment and replacement
Attaching and Replacing a Headrest (option) and
Hanger (option)
The Headrest and Hanger can be attached at the same time
as shown in the illustration. Attach the Headrest first, and then
attach the Hanger. Then, attach the cover on the attachment
by using the tabs.
(1) Attach the hanger on the backside of the backrest by
securing it with fastening bolts.
(2) Secure it with a fastening bolt.
Make sure that the hanger is secured completely before
using.
Fastening
bolt
Fastening
bolt
Backrest
Backrest
Hanger
Cover
Cover
Hanger
Collar
Tab
Tab
Headrest

17 18
Materials
Part Materials
Structural parts
Mesh type Backrest Glass reinforced polyamide >PA-GF<
Lumbar support Polycarbonate resin >PC<
Cushion type
Backrest inner
shell Polypropylene resin >PP<
Lumbar support Polypropylene resin >PP<
Backrest frame Die-cast aluminum >ADC<
Seat inner shell Recycled polypropylene resin >PP<
Seat frame Recycled glass reinforced polyamide >PA-GF<
Legs Die-cast aluminum >ADC<
Design arm Thermoplastic polyurethane resin >TPU<
Die-cast aluminum >ADC<
Adjustable arm
Thermoplastic polyurethane resin >TPU<
Glass reinforced polyamide >PA-GF<
Die-cast aluminum >ADC<
Headrest Polypropylene resin >PP<
Glass reinforced polyamide >PA-GF<
Hanger Polyamide resin >PA<
Covering material Mesh Polyester
Cloth Polyester
Cushion material
Backrest Molded urethane
Seat Molded urethane
Headrest Molded urethane
> XX < indicates the materials of the parts. This information is useful for recycling.
Please understand that product specifications might change without prior notification due to improvements made
to the product.
Troubleshooting
Problem Check Solution Page
The seat cannot be lifted up.
Are you sitting on the seat
when adjusting the seat
height?
Adjust the seat height while
not seated on the seat. 7
Is the seat height in its highest
position?
The seat cannot be lifted up
beyond the highest position. 7
The seat cannot be lowered.
Are you sitting on the front
edge of the seat?
Sit in the center of the seat
while adjusting. 7
Is the seat height in the lowest
position?
The seat cannot be lowered
beyond the lowest position. 7
The seat slide lever does not
work.
Are you sitting on the seat
when adjusting the seat
depth?
Adjust the seat depth while
not seated on the seat. 8
The backrest does not recline.
The lever on the bottom left of
the seat is locked.
Lift the lever to release the
lock, and then lean against
the backrest.
9
The reclining tension
adjustment lever is set to the
strong (back) position.
Turn the reclining tension
adjustment lever to the weak
(front) position.
10
Casters do not move
smoothly.
Are you using rubber casters
on a rug or carpet? Use urethane casters. 
Are they tangled with lint or
wool?
Remove lint or wool or replace
the casters. 
Casters are slippery.
Are you using urethane
casters on hard floors such as
a plastic tile floor?
Use rubber casters. 
Chair makes noise. - Visit a retail shop or the
nearest branch. 
Please contact an official dealer.