Midmark 425, 427 Assembly Instruction Manual
Assembly
Instructions
Stools: Models 425 and 427
MODEL 425
(The above models are shown with optional items attached.)
MODEL 427
Introduction
These assembly instructions are intended to assist you
in assembling Midmark's Model #425 and #427 Stools.
Please follow these instructions to assure proper
assembly.
Unpacking
EQUIPMENT ALERT
To avoid damage, do not use a knife or any other
sharp object for opening cartons.
Assembly
Remove the stool from the carton. Depending on the
optional items that you purchased, assemble the stool
in the following order:
- Optional Lab Height Kit Assembly
- Optional Armrest Assembly
- Optional Backrest Assembly
- Seat Assembly
Optional Lab Height Kit Assembly
Place the base stool on its side. Remove the roller
base from the gas cylinder by using a hammer to pound
the roller base from the gas cylinder. To prevent
marking, use a piece of cardboard or wood over the
roller base before striking it. Strike as close to the gas
cylinder as possible and rotate to a different leg with
each blow. Insert extension tube thru the foot ring.
Tighten the knob firmly to prevent the foot ring from
rotating around the tube. Insert the gas cylinder into the
extension tube (see Figure 1). Finally, insert the
extension tube into the roller base.
Bellows
Gas Cylinder
Knob
Roller Base
FIGURE 1
Extension Tube
MA8374i
NOTE
If you have ordered a Lab Height Kit, please assemble the Lab Height Kit to the base stool first. We
suggest that no armrests or backrests be mounted to
the stool during the lab height assembly.
NOTE
The Lab Height Kit cannot be used on 427 Foot
Release Models.
Foot Ring
Sheet
4
1
of
Armpad
Angular
Adjustment
Optional Backrest Assembly
FIGURE 4
Insert the backrest bar into the back channel and under
the mounting plate (see Figure 2). Align the tapped
holes in the backrest bar with the back mounting slot in
the mounting plate. Using the supplied 5/32 Allen Key,
drive the two 1/4 - 20 x 3/8 screws through the mounting plate and into the backrest bar. Tighten the screws
and place the Allen Key into the Allen Key recess.
Seat Assembly
FIGURE 2
Optional Armrest Assembly
FIGURE 3
Insert the armrest bar into the arm channel and under
the mounting plate (see Figure 2). Align the two tapped
holes in the armrest bar with the two arm mounting
slots in the mounting plate. Using the supplied 5/32
Allen Key, drive the two 1/4-20 x 3/8 screws through the
mounting plate and into the armrest bar. Repeat the
above procedure with the other armrest. After tightening the last screw, place the Allen Key into the Allen Key
recess.
Insert the three channel plugs into the plug slots--if
FIGURE 5
needed (see Figure 2). You'll find the channel plugs in
the small parts bag.
Remove the seat cushion from its carton. Align the
three velcro patches on the bottom of the seat cushion
with the three velcro hook patches on the base stool.
Then, place the seat cushion onto the base stool. If the
cushion isn't centered on the base stool, pull the
cushion up and try again.
Sheet
4
2
of
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