Table of Contents
Advertisement
Drive Speeds
The drive speed is proportional to the joystick position. The
farther the joystick is moved, the faster the travel speed.
Always slow down and shift the drive system to low range
before traveling over rough terrain or any sloped surface.
Drive speed ranges are interlocked through limit switches
that sense the main boom position.
• When the main boom is elevated or extended, only
the slowest drive speed will work regardless of the
drive range switch position.
• To avoid a sudden speed change from high to low
elevated boom speed, always bring the machine to
a stop before raising the booms from the stowed
position.
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury could result from such accidents. Do not alter,
disable, or override any safety device.
Do not use the aerial platform if it drives faster than 0.75
miles per hour (22 feet in 20 seconds) when any of the
booms are out of the stowed position.
Pivoting Front Axle
The front axle control system allows the front axle to pivot
while driving to keep all four wheels in contact with the
ground for better traction and provides a smoother ride
over rough terrain. When the machine is stationary, the
system hydraulically locks the front axle to provide stability
while using the boom functions.
Machine in Stowed Position
When the main boom is in the stowed position, centered
over the rear axle, the boom can be extended and/or
elevated above horizontal and the front axle will pivot
while driving.
When the main boom is below horizontal and retracted,
the maximum drive speed is 4.25 mph (6.6 km/h).
Machine Not in Stowed Position
When the turntable is rotated and the boom angle is greater
than +/-20° from the stowed position and the main boom
is not stowed, the oscillating axle lock-out cylinders will
hydraulically lock to prevent movement of the front axle.
With the main boom either elevated above horizontal or
extended, the maximum drive speed is limited to 0.75 mph
(1.2 km/h) for ANSI and 0.6 mph (0.96 km/h for CE/AS/
NZS machines.
Stow the main boom before driving the machine to re-
position it when operating on uneven surfaces. With the
boom stowed, the front axle pivots to keep all four wheels
in contact with the ground surface.
460SJ – 1433685
Boom and Turntable Position/Axle and Drive Speeds
The position of the booms and turntable have a direct
affect on whether or not the front axle will pivot and the
maximum drive speed (refer to Figure 8.5).
Condition
Turntable
Boom
Boom
Position/Degree
Angle
Position
from Stowed
Position
Below
Retracted
Any
Horizontal
Above
Stowed – Boom
Retracted
Horizontal
over rear axle/0°
Above
Stowed – Boom
Extended
Horizontal
over rear axle/0°
Above
+/- 20° CW
Extended
Horizontal
or +/- 20° CCW
Figure 8.5 – Boom/Turntable Position
Effect on Front Axle and Drive Speed
Drive Motion Alarm
The drive motion alarm sounds loud intermittent beeps
anytime the machine is being driven.
Boom/Drive Cut-out
On machines manufactured after March 2021, boom and
drive functions will be cut-out, disabled, when the main
boom is elevated or extended from the stowed position
and the ground slope exceeds the chassis slope sensor
settings. The override switch may be used to stow the
machine which then allows all functions to be returned
to normal. The emergency power system may be used
at this time as well.
When driving the machine unstowed onto a slope, at 4.5
degrees slope drive is paused, an audible two-tone alarm
will sound, and the tilt warning light will come on. This
warning indicates that the machine may be backed off
the slope or stowed without the use of the override switch
to do so. If the degree of slope continues to increase to
5 degrees, a constant alarm will sound and boom and
drive functions will become disabled requiring the use of
the override control to stow the machine.
Platform Overload Sensing System
When the platform is at full capacity, the platform overload
light at the lower and upper controls (refer to Figures 8.1
and 8.2) will be solid on.
When the platform overload limit is exceeded, all func-
tions are stopped from the upper and lower controls. The
horn will sound intermittently and the platform overload
lights will blink until the excess load is removed from the
platform. At that time, the machine functions are again
operational.
If the platform becomes significantly overloaded, or if an
upward force on the platform exceeds approximately 500
Chapter 8 – Operation
Result
Axle
Maximum
Pivots?
Drive Speed
Yes
4.25 mph (6.6 km/h)
ANSI
0.75 mph (1.2 km/h)
Yes
CE/AS/NZS
0.6 mph (0.96 km/h)
ANSI
0.75 mph (1.2 km/h)
Yes
CE/AS/NZS
0.6 mph (0.96 km/h)
ANSI
0.75 mph (1.2 km/h)
No
CE/AS/NZS
0.6 mph (0.96 km/h)
51
Advertisement
Table of Contents
