Snorkel TB47J CE - Manual (Page 45)

Chapter 8 – Operation
TB47J – 0075239EE 41
Boom Operation
Use the following procedure to operate the turntable,
boom, or platform functions.
1. Turn the boom speed knob to slow.
2. Step down on the platform foot switch. This switch
must be held down to operate the upper controls.
Figure 8.4 – Platform
3. Hold the appropriate control in the desired direction.
Always look in the direction of movement.
4. Gradually turn the boom speed knob to control the
boom extend, jib, and platform rotate function speed.
5. Releasing the control to its neutral position, or re-
leasing the foot switch will stop movement.
Platform Overload Sensing System
Boom and drive functions are stopped when the platform
load reaches or exceeds rated capacity. The horn will
sound intermittently and the red light (refer to Figure 8.3)
will illuminate when the platform rated work load is ex-
ceeded.
Lanyard
Anchors
Platform Foot Switch
Figure 8.3 – Upper Controls
Top Front
The horn will sound and the light will flash until the ex-
cess load is removed from the platform. At that time, the
boom and drive functions are again operational.
If the overload exceeds rated platform capacity by more
than 20 percent, the system will error out, stopping all
boom and drive functions. The horn will then sound con-
tinuously and the red light will stay illuminated at the
upper and lower controls (refer to Figure 8.2).
The horn will sound and the light will stay on until the
excess load is removed from the platform and the start
switch is turned off and back on, resetting the system. At
that time, the boom and drive functions are operational.
A
Danger
The aerial platform can tip over if it becomes un-
stable. Death or serious injury will result from a tip-
over accident. Do not exceed the capacity values
indicated on the platform rating placard.
The overload sensing system is not active when the ma-
chine is being driven with the main boom below horizon-
tal and fully retracted. This allows the machine to be driven
without the system sensing an overload due to rough
ground conditions.
To eliminate repeated tripping of the system during ma-
chine operation, there is a five second delay in machine
functions following:
• starting the engine.
• placing the drive/boom selector switch in the boom
position when the main boom is below horizontal and
fully retracted.
• removing excess load from the platform.
Start Switch
Emergency Stop
Platform
Overload Light