Chapter 8 – Operation
A46JRT – 0260996 49
Length
Height
Length
Height
% of Grade
=
x
100
Calculate the percent grade:
• before attempting to climb an unknown grade
• if it is believed that there is a malfunction to determine
if the slope is within the actual grade capability of the
aerial platform.
Calculating Percent Grade
The percent grade equals the height (rise) of the slope
divided by the length (run) times 100. Refer to Figure 8.5.
Figure 8.5 – Percent Grade Formula
The grade can be measured with an inclinometer or by
using a tape measure, a level, and a straight 2 x 4. If
using an inclinometer, refer to the conversion diagram
if necessary.
To measure the grade without an inclinometer, use the
following procedure.
1. With the 2 x 4 laying parallel with the slope, lay the
level lengthwise on the 2 x 4.
2. Holding the downhill end, raise the 2 x 4 until the level
indicates that the board is level (refer to Figure 8.6).
Figure 8.6 – Percent Grade Calculation
3. Use the tape measure to measure the distance
(height) from the end of the 2 x 4 to the ground.
Record the height distance.
4. Measure the length of the 2 x 4 and record this mea-
surement.
5. Use the formula in Figure 8.5 to calculate the percent
of the grade.
Machine Gradeability
The gradeability specification for the A46JRT aerial plat-
forms is 45%. An actual gradeability of 45%, indicates that
in most normal working conditions the machine can be
driven on a slope with an angle of 24.2 degrees.
Electrical Power Outlet
The electrical outlets at the platform have 2, 3-prong, 110
volt AC electrical connectors. Their combined output is
limited by a 15 amp circuit breaker.
Power may be supplied to the outlet using an external
power source or by operating the optional AC generator.
To use the outlet, plug a source of power into the pow-
er-input connector on the right side of the chassis (refer
to Figure 8.7). Unplug the source of power before moving
the aerial platform.
Figure 8.7 – Power-Input Connector
AC Generator
The optional generator supplies power to the electrical
outlet only when the engine is running and the machine
is stationary. The machine functions will not operate when
the generator switch is in the generator position.
Caution
Cold hydraulic oil does not flow well and may produce
improper generator output voltage. Improper outlet
voltage may damage some electrical power tools and
equipment. Warm the hydraulic oil before operating
the generator.
Do not operate the generator unless the hydraulic oil is at
operating temperature. Refer to Cold Weather Start-Up
for a hydraulic oil warm-up procedure.
To supply power to the electrical power outlet, start the
engine and place the machine/generator switch (refer to
Figure 8.8) in the generator position.
Power-Input
Connector
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