Turnstone Crew Task Chair User manual

Page 1 of 16
939500070 Rev E
Crew Task Chair - Components for Customer Service R
#2 PHILLIPS BIT
Table of Contents
Page Topic
Replacement of Casters
Replacement of Pneumatic Cylinder
Replacement of Foot Ring
Replacement of Back Assembly
Replacement of Adjustable Height Insert & Spring
Replacement of Seat-Slide Assembly
Replacement of Seat Assembly
Replacement of Arm Assembly
Replacement of Arm Caps
Replacement of Arm Toggle
Replacement of Chair Control
©2006 Steelcase Inc.
Grand Rapids, MI 49501 U.S.A.
Printed in U.S.A.
2
3-4
5
6-7
8
9-10
11
12
13
14-15
16
3/16
ALLEN
T-30

Page 2 of 16
939500070 Rev E
Replacement of Casters
2
2
3
1. Gently rest the chair on its back.
2. Pull/wiggle the casters out.
(Pry with a screwdriver, if additional
force is required. Take care to not
damage surfaces.)
3. Push the new casters in. This
should take minimal force.
CAUTION: Do not put your fingers
between the base and the new
caster while installing.

Page 3 of 16
939500070 Rev E
Replacement of Pneumatic
Cylinder
1. Extend chair to the highest seating
position.
2. Turn chair upside down or on its side.
Hold one of the legs of the five star base
with one hand. Hit the bottom of the
cylinder with a non-marring hammer.
3. Install the pneumatic cylinder removal
tool (part number 879100100) on the top
part of the cylinder, as close as possible
to the chair control.
4. Apply lifting force to the cylinder with
one hand. With the hammer in the other
hand, give the removal tool several solid
hits on the flat part.
If pneumatic cylinder does not separate
from the chair control, apply WD-40
where cylinder is embedded into the chair
control. Wait approx. 20 minutes and
repeat step 4.
3
4
21

Page 4 of 16
939500070 Rev E
Replacement of Pneumatic
Cylinder (Continued)
To install new Pneumatic Cylinder
5. Insert new cylinder into chair (5a). Lightly
tap once with a non-marring hammer (5b).
6. Set chair with new cylinder into the base
of the chair.
7. Adjust height to ensure the pneumatic
cylinder is aligned properly.
5b
6
5a

Page 5 of 16
939500070 Rev E
Replacement of Foot Ring
1. Extend chair to the highest seating
position.
2. Turn chair upside down or on its side.
Hold one of the legs of the five star base
with one hand. Hit the bottom of the
cylinder with a non-marring hammer.
3. Turn the foot ring as shown and
remove the old foot ring.
4. Insert the new foot ring as shown and
tighten.
5. Reinstall chair base.
2
1
34

Page 6 of 16
939500070 Rev E
Replacement of Back
Assembly
NOTE: Removal of the back will
require two (2) people.
1. Raise back as far as it will go.
2. Under the backrest there are
two white plastic teeth visible,
these are what need to be
pushed forward to release the
back. Position the prying tool
(flat-bladed screwdriver) between
the white plastic back shell and
the control upright. Pry the shell
forward.
3. While prying the shell forward
(step 2), rotate the back height
adjustment levers forward (3a)
and lift up on the back (3b) to
remove.
1
3a
3b
2

Page 7 of 16
939500070 Rev E
Replacement of Back
Assembly (Continued)
4. Slide new back assembly
onto the chair while lightly pulling
height adjustment levers forward
(4a), then align with mechanism
and push down (4b). Release
adjustment levers (4c).
4a
4b
4c

Page 8 of 16
939500070 Rev E
Replacement of
Adjustable Height
Insert & Spring
1. Apply downward pressure to
the seat.
2. Squeeze and hold arm height
adjustment lever.
3. Lower arm to the lowest
position and quickly jerk up on the
arm assembly to disengage arm
assembly from chair.
4. Remove and dispose of the old
spring and insert.
5. Install new spring into arm
assembly.
6. Install new insert into arm tube.
7. Squeeze and hold arm height
adjustment lever, while installing
arm assembly to arm tube.
8. Check for proper operation.
9. Repeat all steps for the other
side.
2
3
1
SPRING
SPRING
INSERT
ARM
ASSEMBLY
4
5
ARM HEIGHT
ADJUSTMENT LEVER

Page 9 of 16
939500070 Rev E
1
= Spring Locations
= Screw Locations
2
3
Replacement of
Seat-Slide Assembly
1. Gently rest chair on its back.
2. Remove eight (8) torx drive
screws.
3. Remove seat slide
handle guards and seat
slide handle brackets.
SEAT SLIDE HANDLE
GUARD
SEAT SLIDE HANDLE
BRACKET

Page 10 of 16
939500070 Rev E
4
5
6
SPRING
Replacement of
Seat-Slide Assembly
(Continued)
4. Remove seat slide handle.
5. Remove springs.
6. Remove seat retainers.
7. Determine which screws you
have that attach the seat slide handle
guards and seat retainers:
If you have the old screw, this must
be replaced with the new screw.
If you have the intermediate screw
and you are NOT replacing the seat,
apply loctite to the screws and reuse.
If you are replacing the seat, use the
supplied new screw.
If you have the new screw, you can
reuse it.
8. Install new parts in reverse order
(steps 6 through 2).
9. Ensure the screws are tight.
SEAT SLIDE
HANDLE
SEAT
RETAINER
= Spring Locations
= Screw Locations
OLD
TORX DRIVE
WASHER HEAD
NEW
TORX DRIVE
PAN HEAD
INTERMEDIATE
PHILLIPS DRIVE
PAN HEAD

Page 11 of 16
939500070 Rev E
2a
2b
Replacement of Seat
Assembly
1. Remove hardware from seat
by performing steps 1 through 6
on pages 8 and 9.
2. Remove seat by tilting the
front of the seat towards the
base of the chair (2a). Pull seat
away from the base of the chair.
When it doesn't go any farther
release the seat pan from the
seat control (2b).
3. Mount new seat pan by
inserting the front chair control
mounts into the slot.
4. Install seat and seat slide
parts (from step 1) by performing
steps 7 through 9 on page 9.
NOTE: If you have the old screw,
you must replace it with the new
screw.
3
NOTE: The rods need
to slide through the
opening in the seat pan.
OLD
TORX DRIVE
WASHER HEAD
NEW
TORX DRIVE
PAN HEAD

Page 12 of 16
939500070 Rev E
2
3
Replacement of Arm
Assembly
1. Remove seat assembly (see
page 9).
2. Remove the four (4) screws.
(Use a 1/2" wrench to prevent the
T-Nut, if present, from spinning.)
3. Remove old arm assembly.
4. Mount new arm. Attaching
with the screws.
5. Ensure the arm is square with
the back and then tighten the
screws.
6. Reinstall seat assembly (See
page 10).

Page 13 of 16
939500070 Rev E
1
SCREW
2
3a
3b
ARM
CAP
Replacement of Arm Caps
1. If your chair has adjustable arms, remove
the height adjustment lever, it should come off
by hand, if not use a 1/2" wrench, or similar, to
pry it and wiggle it the rest of the way off.
2. Remove the Phillips screw.
3. Push armcap towards the back (3a) and
rotate up on the front of the arm cap (3b).
4. Put the new arm caps hook into slit. Seat
the arm cap, and fasten with the screw.
NOTE: If reusing screws, apply loctite before
assembly.
5. Replace height adjustment lever.
HEIGHT
ADJUSTMENT
LEVER

Page 14 of 16
939500070 Rev E
45
6
ARM
ASSEMBLY
SCREW 7
LOCK WASHER
FLAT WASHER
Replacement of Arm
Toggle
1. Loosen cam lock lever and
push the arm in all the way to
align the hole in the arm assembly
with the allen screw head.
2. Using a 3/16" allen wrench,
remove screw and the lever and
other related hardware.
3. Remove the arm.
4. Install the clamp plate into the
tube of the arm assembly.
5. Push the arm assembly into
the outer tube. Align holes in outer
tube and inner tube.
6. Insert screw, ensuring that it
goes through the clamp plate hole
and the tube holes.
7. Place the lock washer and
then the flat washer onto the end
of the screw.
CLAMP
PLATE
1
2
3
CLAMP
PLATE

Page 15 of 16
939500070 Rev E
8
9
10
PIVOT PIN
Replacement of Arm
Toggle
(Continued)
8. Install pivot pin into the cam
lock lever.
9. Turn the lever with pivot pin
installed onto the screw.
10. Adjust screw so that cam
lock lever tightens and loosens
the arm tube.
11. Adjust arms to user
preference and tighten the
lever.
CAM LOCK
LEVER

Page 16 of 16
939500070 Rev E
5
CHAIR
CONTROL
Replacement of Chair Control
1. Remove the seat assembly by performing
steps 1 and 2 on page 10.
2. Remove the seat back by performing
steps 1 through 3 on pages 6 and 7.
3. If applicable, remove the arm assembly
by performing steps 1 through 3 on page 11.
4. Remove the pneumatic cylinder from the
control by performing steps 1 through 4 on
page 3.
5. Place new chair control onto cylinder,
ensuring that it is solidly seated.
6. If applicable reinstall arm assembly by
performing steps 4 through 6 on page 11
7. Mount seat assembly by performing steps
3 and 4 on page 10.
8. Install the seat back assembly by
performing step 4 on page 7.