6
ADC-02
3b.
Using the stabilizer (Fig. 5
A
) as a handle, tilt the chair up on its
wheels until the lift lever (Fig. 5
B
) touches the floor; use your
foot to keep the base of the chair (Fig. 5
C
) from suddenly roll‑
ing towards you. Hold the chair in this position and note that
the hose end of the seat cylinder (Fig. 5
D
) is now oriented up
so that any air in the cylinder will be near the hose fitting.
Fig. 5
Fig. 5
B
A
C
D
3c.
While holding the chair in this position, press and hold the
selector lever (Fig. 6
A
) in the SEAT LOWER position. The seat
will move towards the base, compressing the seat cylinder and
draining oil and any air out of the seat cylinder. As the seat (Fig.
6
B
) moves toward the base, the backrest will approach the
floor. Tilt the chair towards yourself just enough to keep the
backrest off the floor so the seat can continue compressing.
When the seat has compressed most of the way, this operation
is complete. Tilt the chair down with its base on the floor, then
test the hydraulic operation.
Fig. 6
Fig. 6
A
B
If the hydraulic operation still feels soft or jerky, it may be
necessary to perform steps 1 and 2 (page 5) one last time to
firm up the action of the lift lever. If that doesn’t resolve the
issue, proceed to step 4a.
It is important during steps 3 and 4 that the lift lever not be
pumped while the chair is tipped back. Any air in the hydraulic
oil reservoir will be near the pump intake and can be drawn
back into the pump cylinder, which would require purging the
pump again as in step 2 (page 5).
4a.
BACKREST CYLINDER PURGE:
If the backrest hydraulics feel
soft or jerky, this step may be desired. Start with the backrest
(Fig. 7
A
) fully up, the seat (Fig. 7
B
) halfway up, and the stabi‑
lizer (Fig. 7
C
) fully extended.
B
A
Fig. 7
Fig. 7
C
4b.
Lift the stabilizer and place it on an elevated surface such as
a stool (Fig. 8
A
) so that the chair is tilted at approximately
30°. Note that the hose end of the backrest cylinder (Fig. 8
B
) is now oriented up so that any air in the cylinder will be
near the hose fitting. Place one hand on the seat and push
down with your other hand on the backrest (Fig. 8
C
) while
simultaneously holding the selector lever (Fig. 8
D
) in the
BACKREST LOWER position with your foot. The backrest will
recline. When the backrest is completely down, this operation
is done. Put the chair down with its base on the floor, then test
the hydraulic operation.
C
Fig. 8
Fig. 8
D
B
A
If the hydraulic operation still feels soft or jerky, it may be
necessary to perform steps 1 and 2 (page 5) one last time to
firm up the action of the lift lever. If that doesn’t resolve the
issue, proceed to the next section and check the hydraulic oil
level.
CLEANING AND MAINTENANCE
(Cont.)
