Snorkel S3219E-sn000017+ - Manual (Page 49)

S3219E/S4732E – 1500834 45
If the main hydraulic system fails:
The aerial platform may be lowered using the emer-
gency lowering lever.
The machine may be towed if the drive system fails.
Refer to Emergency Lowering, or Towing for the ap-
propriate procedure.
Emergency Lowering
Use the following procedure to operate the emergency
lowering system.
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury can result from such accidents. Immediately
push the emergency stop button inward to disable the
control system before using the emergency lowering
system in the event of an emergency.
1. Immediately push the emergency stop button inward
to disable the control system in the event of an emer-
gency.
2. Retract the platform extension, if possible.
3. Locate the emergency lowering lever at the front of
the aerial platform (refer to Figure 11.1).
Figure 11.1 – Front of Machine
Danger
Pinch points may exist between moving components.
Death or serious injury will result from becoming
trapped between components. Make sure all person-
nel stand clear while lowering the platform with the
emergency lowering system.
4. Make sure there is nothing in the way to obstruct the
platform when it lowers.
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Chapter 11 – Emergency Operation
5. While standing clear of the scissors structure, push
downward on the lever to lower the platform.
6. Release the lever to stop the platform from lowering.
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury could result from such accidents. Fully close
the emergency lowering valve before operating the
aerial platform.
7. Make certain the lever is fully released and the emer-
gency lowering valve is fully closed before operating
the aerial platform.
Towing
The aerial platform may be pushed or pulled after prop-
erly stow the aerial platform and disengaging the brakes.
Use the following procedure to manually disengage the
brakes.
Warning
The aerial platform is free to move when the brakes are
released. Death or serious injury could result. Re-en-
able the brakes before operating the aerial platform.
1. Chock the wheels to prevent uncontrolled motion of
the aerial platform and turn the battery disconnect
switch off.
2. Unlatch and swing out the control valve tray on the
right side of the machine. The brake release valve,
pump, and free-wheeling valves are located on the
hydraulic manifold (refer to Figure 11.2).
Figure 11.2 – Hydraulic Tray
3. Press inward on the brake release valve to the fully
open position.
4. Turn the free-wheeling valve counterclockwise to the
fully open position.
Emergency
Lowering Lever
Free-Wheeling Valve Brake Release Valve
Brake Release Pump