Replacing the gas lift – Extron electronic HSA 402 User Manual
Page 18
HSA 400/402 Series • Maintenance and Modifications
HSA 400/402 Series • Maintenance and Modifications
Maintenance and Modifications, cont’d
Replacing the Gas Lift
The gas lift that raises the HSA surface is rated for 100,000
opening and closing cycles. Replace the gas lift as follows:
Ensure that AC power is disconnected before
servicing the HSA unit.
CAUTION
When the HSA 400/402 is upside-down, the latch
may be ineffective. If the latch releases, the
enclosure will tip and could damage the flanged
edges. Keep a hand on the enclosure to keep it from
tipping.
1
.
Remove the surface mount enclosure from the table. See
“Removing and Replacing the Enclosure”, steps 1 through
8
. Place the enclosure upside-down on a horizontal
surface. To protect the finish, place the enclosure on a soft
cloth.
2
.
Loosen the three Philips head screws that secure the gas
lift mounting plate in place (figure 3-6).
Slide plate back,
then lift straight up.
Loosen (3)
screws.
Figure 3-6 — Releasing the gas lift
3
.
Slide the gas lift mounting plate toward the center of the
enclosure, releasing the mounting plate from the enclosure
(figure 3-6).
4
.
Turn the gas lift mounting plate counterclockwise until the
pivot nut on the plate comes free from the shaft of the gas
lift (figure 3-7).
Flange and
Top Panel
Assembly
Lower
Enclosure
Top Panel
Bracket
Gas Lift
Mounting Plate
Clevis
Pivot Nut
Gas Lift
Piston End
Figure 3-7 — Replacing the gas lift
5
.
Turn the surface mount enclosure onto its back side and
open the top panel.
With the gas lift removed, the top panel must be
manually lifted.
6
.
Remove and retain the 9/32" nut and bolt that secure the
gas lift to the top panel. Pull the gas lift out of the
enclosure.
7
.
Insert the piston end of the replacement gas lift through
the hole in the bottom of the enclosure adjacent to the
latch, and secure the lift in the clevis on the top panel with
the nut and bolt that were removed in step 6.
8
.
Thread the pivot nut on the gas lift mounting plate onto
the shaft of the gas lift and tighten it several turns.
9
.
Firmly push the gas lift mounting plate into position on
the underside of the enclosure, engaging the three
mounting screws. Holding the plate in position, secure it
to the enclosure with the three screws that were loosened
in step 2.
10
.
3-9
3-8