Steelcase 458 Sensor User manual

Page 1 of 4
939501519 Rev A
458 Sensor®Chair Base, Base Cap, Caster And Glides
®
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.
The following directions are provided to aid when replacing the
component parts or assemblies listed:
• Base Caps
• Casters & Glides
Typical 458 Sensor Chair
Index
NOTE: All specifications concerning installation procedures, in. - lbs.,
grease, etc. should be followed to insure proper chair function.
A. Base Caps ........................................................ 2 - 3
B
.
Casters & Glides .............................................. 4

Page 2 of 4
939501519 Rev A
2.
1.
Base Retainer Clip
and Flat Washer
Base
Assembly
Remove
(5) Screws
Old Base Cap
Push Cap
Base Hub Tube
Base
Column
Remove
Pneumatic
Cylinder
(2) Screws
120-180 in./lb.
Cover
Base Ring
Old Base Cap
Remove
(5) Screws
Base Caps

NOTE: Do not over tighten screws on base
cap, dimples may occur.
1. Base Cap Replacement
Turn chair upside down. Remove base
retainer clip and washer if included (old clip
should be discarded). Remove (5) screws
from bottom of base. Slide old base cap
down hub tube by pushing in the center.
Carefully lift base assembly off the chair,
then slide old base cap off the hub tube.

New Base
Remove old base as above, also remove
telebell and telebell retainer. Push on new
telebell/hubcover assembly onto column.
Replace base on chair and install new base
attaching clip.
2. Stool Base
Turn chair upside down. Remove base by
using a 1/4" socket and extension ratchet
and removing the 1/4-20 nut inside the base
column. Remove base assembly from chair.
Remove cover, (2) screws and base ring from
base assembly. Follow the standard base
procedure for removing and installing the
base cap. Re-install from base assembly.
Follow the standard base procedure for
removing and installing the base cap.
Re-install the base ring, (2) screws, cover
and base assembly onto the chair.

Page 3 of 4
939501519 Rev A
3. Fixed Base
Turn chair upside down. Locate and remove 1/2"
hex head bolt from inside base tube, using a 3/4"
socket. Remove base from chair by pulling up and
off. Follow the standard base procedure for removing
and installing the base cap. Re-install the base onto
chair by rotating until the notch on base tube drops
down onto raised tab on chair control.
CAUTION: Failure to properly align base to chair
could cause breakage of chair column. Re-install
spacer, washer & bolt and torque to 75 lb.-ft. If
chair was assembled using (2) washers & bolt,
torque bolt to 40 lb.-ft. after applying Loctite adhesive
to the bolt threads.
CAUTION: Failure to properly install spacer,
washers, Loctite and torque bolt could cause base to
become loose creating an unsafe condition.
4. Swivel Base
Turn chair upside down. Locate and remove the
1/4-20 phillips head bolt and thrust washer (see
illustration above). Remove base from chair by
pulling up and off. Follow the standard procedure
listed above for removing and installing base caps.
Replace base and secure with thrust washer, Loctite
and the 1/4-20 bolt.
NOTE: Torque bolt 60 to 80 in.-lbs.
Remove
Replace (5) Screws
(Recommend Maximum
8 in.-lb. Torque)
New Base Cap
3.
4.

Page 4 of 4
939501519 Rev A
Casters
To remove casters, strike with a rubber mallet.
Insert new casters.










Glides
To remove glides, strike with a rubber mallet.
Insert new glides.
Casters
Glides