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939501155 Rev A
Replacing Chair Control and Column Assembly
on all Concentrx® Plus Chairs
®
If you have a problem, question, or request, call
your local dealer, or Steelcase Line 1 at
888.STEELCASE (888.783.3522)
for immediate action by people who want to help you.
(Outside the U.S.A., Canada, Mexico, Puerto Rico,
and the U.S. Virgin Islands, call: 1.616.247.2500)
Or visit our website: www.steelcase.com
© 2004 Steelcase Inc.
Grand Rapids, MI 49501
U.S.A.
Printed in U.S.A.
Posture Chair:
454-560
454-561
454-562
454-562V
454-560M
454-561M
454-562M
454-562MV
454-570
454-571
454-572
454-572V
454-570M
454-571M
454-572M
454-572MV
These directions apply to the following Models:
Posture Stool:
454-760
454-761
454-762
454-762V
454-770
454-771
454-772
454-772V
NOTE:
For replacement of the Twist-O-Matic refer to
Assembly Directions #939501013.
For replacement of the Pneumatic assembly
refer to Assembly Direction #939501474.
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939501155 Rev A
Chair Base
Standard Base Stool Base
Upholstered Seat
#8 x 1-1/2"
#8 x 1-1/8"
#8 x 1-1/8"
#8 x 3/4"
1. Place chair on work bench in an inverted
position. Remove retainer ring from center
column of posture chair or hex nut from 8"
into center column of posture stool and retain.
Lift chair base off center column.
2. Remove (7) screws and the outer seat shell
from upholstered seat.
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939501155 Rev A
Adjustment Handle
Outer Back Shell
#8 x 1-1/2"
#8 x 1-1/8"
Upholstered Back
1/4-20 Bolts
1/4-20 Bolts
Upholstered Seat
3. Remove (5) screws, adjustment handle
and outer back shell from upholstered back.
4. Remove (4) 1/4-20 bolts, hex nuts and
upholstered back upright from chair control.
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939501155 Rev A
5. Remove (4) 1/4-20 bolts, hex nuts and
upholstered back upright from chair control.
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939501155 Rev A
Pneumatic
Button
Pneumatic
Pushrod
Adjustment Screw
Center Button on
Pneumatic Cylinder
FOR PNEUMATIC CHAIR CONTROLS ONLY
NOTE: Make sure that the new chair control assembly has
a pneumatic button color coordinated to that of the
discarded control assembly.
6. Position the chair control as shown below. Check the
movement of the chair control button. If the control button
has any movement in excess of 1/16" before contact is
made with the center button on the pneumatic cylinder, the
following adjustments are to be made:
A. Rotate the adjustment screw clockwise using an allen
wrench until it contacts the center button.
B. Check movement of the control button. If it moves from
0" to 1/16" before contact is made, adjustment is correct.
7. To re-assemble chair with new chair assembly in place
repeat Steps 1 - 5 in reverse order.
NOTE: It is essential that lubricant be evident all around the
outside surface of chair control column. If no lubricant is
evident apply as noted above using either Amoco Food
Machinery or Brush Lube.
8. Place chair upright on floor, stand on the base and
pull upward on seat assembly to make certain the center
column assemblies (Twist-O-Matic or Pneumatic) are
properly positioned and secured. Check for swivel action,
back adjustment and seat height adjustment.
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