SKYJACK, Page 27SJIII Series
Section 1 - Scheduled Maintenance Function Tests
Test Emergency Lowering•
1. Raise the platform.
2. 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.
3. On hydraulic/electric tray, pull out and
hold emergency lowering valve to fully
lower the platform.
Result: The platform should lower.
4. To restore normal operation, depress and
turn holding valve manual override knobs
clockwise.
Test Free-wheeling•
1. Ensure path of intended motion is clear.
2. Release the brake manually.
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.
Conventional
(Back View)
Compact
(Back View)
Platform/Off/Base
Key Switch
Lower/
Neutral/Raise
Switch
Lower/
Neutral/Raise
Switch
Free-wheeling
Valve
Emergency Stop
Button
Emergency Stop
Button
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