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CHAIR ADJUSTMENT INSTRUCTIONS
To maximize the ergonomic benefits of this chair, it is essential to understand how the controls function and how they affect your posture.
ADJUST THE
HEIGHT RANGE:
The wavetube gives the
chair an extra 10" of height
adjustment, providing a total
seat height range of 17" to
35". Determine the
appropriate range for the
task or tasks at hand. Place
a foot on the chair base and
lift the seat with a sharp
pull. The upper chair
assembly will disconnect
from the base. Spread the
tapered bushing and move
it along the wavetube to the
desired position (toward the
seat for lower height range,
toward the open end for
higher ranges). Do not let
any part of the bushing
extend beyond either end
of the wavetube.
MAINTENANCE
The pneumatic lift in the Cylinder is
permanently lubricated at the factory and
needs no further lubrication. NEVER
LUBRICATE THE PNEUMATIC LIFT. Do not
remove clip from bottom of Cylinder. Contact
Safco immediately if clip is missing or
damaged. Clean polyurethane seat and back
with soap and water. To repair small cuts in
polyurethane, apply a few drops of quick-
drying glue into the cut and press the sides
together until the glue sets.
5120-37MP: 2 of 6; Rev. 5: 5/10
ADJUST THE
FINAL HEIGHT:
The front lever under the
seat on the left side
pneumatically adjusts the
height of the seat over a
range of about 8". The
proper height should be
determined by a
combination of variables:
the height of the work
surface, the task to be
performed and your body
size. Typically, the chair
should be high enough so
your arms form a 90 angle
o
at the elbow or slightly
greater. This allows for
better circulation in the
shoulders and neck area
and also reduces the
amount of fatigue in the
forearms and hands. The
feet should lie flat on the
ground or footrest. To help
insure good posture,
maintain a 90 angle at the
o
bend of the knees.
ADJUST THE
BACK HEIGHT:
The backrest height
adjustment lever is behind
and below the seat. By
sliding the backrest
assembly up or down, you
adjust the height of the back,
which has a lumbar support
curve to it. Sit centered on
the seat. The curve in the
backrest should fit into the
small of your back. This will
reduce the pressure on the
spinal discs, especially in
the lumbar area.
GENERAL SAFETY INSTRUCTIONS
Do not stand on seat.
Chair must be on level surface to ensure proper
stability.
Only use chair when fully assembled.
Never use chair if it does not perform according
to this sheet or warranty may be void.
Immediately report any problems to Safco and
always give the manufacturer's date code
information from the label under the seat.
CAUTION: Allow for optimum support. Never try
to position Tapered Bushing below the retaining
ring at the bottom of the Wavetube. Always leave
at least 1/2" clearance between the bottom of the
Wavetube and the floor.
ADJUST THE
BACK ANGLE:
The back angle adjustment
lever is the rear one on the
left side, under the seat.
The 22 angle adjustment
o
of the backrest is especially
critical for work tasks that
require leaning forward. Lift
the lever and allow the
surface of the backrest to
support the upper body
weight by positioning it to
the natural curve of the
spine. Press down on the
lever to lock into place. The
backrest hinge should tilt
freely, to help prevent
twisting of the spine.
Safco Products Company, New Hope, MN 55428
ADJUST THE
SEAT ANGLE:
The seat angle adjustment
lever is the one on the right
side, under the seat. The
seat tilt is important for work
tasks that require leaning
forward. The 10 tilt allows
o
you to lean forward without
extra pressure under the
thighs. Lift the lever and
shift your weight forward
until you find a
comfortable position, then
release the lever to lock
into place.