M-TI 322 Manual

Instruction Guide | 322/323/324
U.S. & Canada [phone] |International [phone] |www.mti.net
WARNING/AVERTISSEMENT
Read this manual before installation and use.
Lisez ce manuel avant l’installation et l’utilisation.
Required Tools (324 Model Only)
5/32” Allen
Wrench
Optional Tools (324 Model Only)
Phillips
Screwdriver
Awl or sharp instrument
3/16” Allen
Wrench
This manual is for the following part numbers:
PART NUMBER DESCRIPTION
322-XX-XXX Stool, Pneumatic Hand Operated, Chrome Base w/o Backrest
323-XX-XXX Stool, Pneumatic Hand Operated, Chrome Base w/ Ergo Backrest
324-XX-XXX Stool, Pneumatic Hand Operated, Chrome Base w/ Body Support
REVISION HISTORY TABLE
DAT E REVISION CO#/ECO# DETAILS
12/22/2015 A CO-0066 Initial release

2 Instruction Guide | 322/323/324
INSTALLATION
Backrest Installation
(Model 323)
Accessories Gas spring Installation Body Support Installation
(Model 324)
OR
1. Insert the backrest into the
bracket on the underside of
the seat. Place 1 lock washer
between 2 standard washers
on the knob and tighten
into place.
If applicable, see accessory
instructions for foot ring and
foot extension accessories
before completing step 2.
2. Install the larger end of
the gas spring into the base
of the stool. Place the seat
of the stool on top of the
gas spring. Sit on the stool
to secure the pieces.
3. Attach the body support
tube to the bracket on the
underside of the seat with
(2) 1-1/2” flat head screws
using a 5/32” Allen wrench.
Insert the rod of the ratchet
assembly into the body
support tube with the flat
side towards the knob and
tighten it into place.
Moving Body Support to Left Hand Side
12
3
1. Remove the three bolts
that secure the body
support ratchet to the body
support cushion using a
3/16” Allen wrench.
2. Feel for 3 holes hidden
under upholstery on the
opposite side of the body
support cushion. Pierce
3 holes through the
upholstery using a sharp
instrument.
3. Remove the top plate of
the ratchet assembly, held
with two screws, using a
phillips screwdriver. Remove
the black plastic washer. (It
may stick to the bottom of
the top plate).
4. Flip the ratchet lever over
and place it over the pin
and verify the end of the
spring is in the hole of the
ratchet lever.
5. Place the black plastic
washer over the pin and on
top of the ratchet lever and
reassemble the lid.
6. Reattach the body
support ratchet using the
3/16” Allen wrench.

Instruction Guide | 322/323/324 3
SPECIFICATIONS
DESCRIPTION SPECIFICATION
Load Capacity 322: 300 lbs (136.1 kg) • 323: 300 lbs (136.1 kg) • 324: 275 lbs (127.4 kg)
Height of Stool 322/323: 18.25” to 24.5” (463.6 mm to 622.3 mm )
324: 19” to 25.25” (482.6 mm to 641.4 mm)
Weight of Stool 322: 15 lbs (6.8 kg) • 323: 20 lbs (9.1 kg) • 324: 26 lbs (11.8 kg)
Shipping Weight of Stool 322: 18 lbs (8.2 kg) • 323: 23 lbs (10.4 kg) • 324: 32 lbs (14.5 kg)
Shipping Size of Stool 322: 23” x 23” x 11” (585 mm x 585 mm x 280 mm)
323: 23” x 23” x 13” (585 mm x 585 mm x 331 mm)
324: 25” x 25” x 25” (635 mm x 635 mm x 635 mm)
OPERATION
1. To raise the height of the
stool, lift up on the lever
below the seat with no
weight on the seat.
2. To lower the height of
the stool, lift up on the
lever below the seat while
placing weight on the seat.
3a. The body support will
swivel towards the stool by
pulling on the support.
3b. To move the support
away from the stool, press
the lever on the underside
of the support towards the
stool and move the support
away.
4. To adjust the height of
the body support, loosen
the knob on the side of the
body support, adjust the
height, and tighten the knob.
6. To adjust the position of
the back, loosen the knob
under the seat, slide the
back in or out, and tighten
the knob.

4 Instruction Guide | 322/323/324
PART NUMBER QTY DESCRIPTION
032099 4PHP SCREW, 1/4-20 x 5/8 ZINC
033001A 4 HEX HEAD BOLT, 1/4-20 x 3/4 ZINC
037003 1FLUTED KNOB, 3/8-16 X 1, 2-1/2 DIA BLACK
045032 2 SAE WASHER, 3/8 ZINC
045148 8LOCK WASHER, 1/4, ZINC
045150 1LOCK WASHER, 3/8, ZINC
056001 5CASTER, 2" HARD PLASTIC DUAL WHEEL BLACK
063001 1BASE, 5 CASTER CHROME 50 MM
063007 1RELEASE MECHANISM KIT, HAND OPERATED
1009004 1MTG PLATE WLD, STOOL SEAT, SG/EG
1009009-XX-XXX 1ROUND SEAT ASSY, 16.5" DIA
130-0336 1GAS SPRING, HAND OPERATED STOOL CYLINDER, 6.38"
1009009-XX-XXX
130-0336
063001
056001 5X
032099 4X
063007
033001A
4X
045148 4X
1009004
045148 4X
037003
045032
045150
045032
THE XX OF DRAWING/PART NUMBER REFERS TO CONSTRUCTION CODE.
THE XXX OF DRAWING/PART NUMBER REFERS TO COLOR CODE.
CONTACT MTI FOR SPECIFIC COLOR AND CONSTRUCTION CODES.
-XX-XXX PNEUMATIC HAND OPERATED CHROME BASE STOOL W/O BACKREST
EXPLODED VIEWS

Instruction Guide | 322/323/324 5
PART NUMBER QTY DESCRIPTION
032099 4PHP SCREW, 1/4-20 x 5/8 ZINC
033001A 4 HEX HEAD BOLT, 1/4-20 x 3/4 ZINC
037003 1FLUTED KNOB, 3/8-16 X 1, 2-1/2 DIA BLACK
045032 2 SAE WASHER, 3/8 ZINC
045148 8LOCK WASHER, 1/4, ZINC
045150 1LOCK WASHER, 3/8, ZINC
056001 5CASTER, 2" HARD PLASTIC DUAL WHEEL BLACK
063001 1BASE, 5 CASTER CHROME 50 MM
063007 1RELEASE MECHANISM KIT, HAND OPERATED
1009004 1MTG PLATE WLD, STOOL SEAT, SG/EG
1009009-XX-XXX 1ROUND SEAT ASSY, 16.5" DIA
1009191-XX-XXX 1ERGO BACK ASSY
130-0336 1GAS SPRING, HAND OPERATED STOOL CYLINDER, 6.38"
1009009-XX-XXX
1009191-XX-XXX
130-0336
063001
056001 5X
032099 4X
063007
033001A 4X
045148 4X
1009004
045148 4X
037003
045032
045150
045032
THE XX OF DRAWING/PART NUMBER REFERS TO CONSTRUCTION CODE.
THE XXX OF DRAWING/PART NUMBER REFERS TO COLOR CODE.
CONTACT MTI FOR SPECIFIC COLOR AND CONSTRUCTION CODES.
-XX-XXX PNEUMATIC HAND OPERATED CHROME BASE STOOL W/ ERGO BACKREST