Skyjack SJIII 3220 Service Manual page 27

Section 1 - Scheduled Maintenance
Back View
Neutral/Raise
Retract Switch
Platform/Off/Base
Toggle Switch
• 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.
SJIII DC Electric
SJIII 3220 SJIII 3226 SJIII 4620 SJIII 4626 SJIII 4632
157935
Lower/
Switch
Extend/
Emergency Stop
Button
• 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.
Function Tests
Free-wheeling
Valve
Platform/Off/
Base Key Switch
SKYJACK, Page 27