Skyjack SJIII 4620 Operating Manual page 27

Section 2 - Familiarization
SJIII 3220, 3226 & 46xx
(Back View)
Lower/
Neutral/Raise
Switch
Emergency Stop
Button
• Test Emergency Lowering
1. Raise the platform.
2. Turn main power disconnect switch to
" " off position.
3. Locate holding valve manual override
knob at the base of each lift cylinder.
Depress and turn counterclockwise. If
necessary, use access rod that is located
on the base of the aerial platform.
4. On hydraulic/electric tray, pull out and
hold emergency lowering valve to fully
lower the platform.
Result: The platform should lower.
5. To restore normal operation, depress and
turn holding valve manual override knobs
clockwise.
SJIII DC Electric
It is the responsibility of the operator to read, completely understand and follow all instructions and warnings
Free-wheeling
Valve
Platform/Off/Base
Key Switch
contained in this operating manual and on the aerial platform.
Lower/
Neutral/Raise
Switch
• Test Free-wheeling
1. Ensure path of intended motion is clear.
2. Release the brake manually (refer to
Section 2.5-2).
3. Tu r n f r e e - w h e e l i n g v a l v e k n o b
counterclockwise to a fully opened
position and attempt to push/pull the
aerial platform.
Result: Platform should move.
4. Turn free-wheeling valve knob clockwise
to a fully closed position for normal
operation.
5. Reengage the brake (refer to
Function Tests
SJIII 3215 & 3219
(Back View)
Emergency Stop
Button
Section 2.5-2).
Page 27