Preparing For Operation; Lower Controls; Envelope Restriction; Upper Controls - Snorkel TB42J Operato's Manual

Chapter 8 – Operation
Use cold weather hydraulic oil as recommended in the
machine General Specifications in temperatures of 10°F
(0°C) or below.

Preparing for Operation

Use the following procedure to prepare the aerial platform
for operation.
1. Perform a prestart inspection as described in Chap-
ter 7.
2. Place the battery disconnect switch in the on posi-
tion.
3. Close and latch the doors.
4. Before painting or sandblasting make sure the sand-
blast protection kit and the platform control cover are
properly installed. These options, when used prop-
erly will protect the control placards and cylinder rods
from paint overspray and abrasion while sandblast-
ing.

Lower Controls

The lower controls override the upper controls. This means
that the lower controls can always be used to operate
the platform regardless of the position of the upper con-
trol emergency stop button.
Boom, turntable, and platform functions may be oper-
ated from the lower controls. The lower controls may be
used for initial set up of the aerial platform, and for testing
and inspection.
Use the following procedure to operate boom, turntable,
or platform functions using the lower controls.
1. Place the emergency stop switch (refer to Figure 8.2)
in the on position and place the ground controls switch
in the on position.
2. Turn the start switch to on and pause a few seconds
while the alarm sounds to alert others that the ma-
chine is about to start. Turn the switch to start, then
release it to on. The engine will not start if the switch
is left in the on position for 30 seconds or longer
before turning it to start. The switch must be turned
back to off before the engine will start.
3. Let the engine warm to operating temperature.
4. Hold the ground controls switch in the on position
while operating the control toggle switches.
42
Emergency
Stop Switch
Emergency
Power Switch
Figure 8.2 – Lower Controls
5. Hold the appropriate toggle switch in the desired di-
rection.
6. Release the function toggle switch to stop movement.
7. Place the ground controls switch in the off position
when no functions are being operated.

Envelope Restriction

Boom movement is restricted in the lower portion of the
working envelope to ensure the design limits of the ma-
chine are not exceeded.
When extending the tip boom, if the main boom angle is
too low, the tip boom will not fully extend and the enve-
lope restriction light on the upper control panel will illumi-
nate. The light will stay on until the main boom is raised
enough to allow for farther boom extension.
When lowering the main boom, if the tip boom is ex-
tended too far, the main boom will not lower and the enve-
lope restriction light will illuminate. The light will stay on
until the tip boom is retracted enough to allow for farther
boom lowering.

Upper Controls

The upper controls may be used for driving the aerial plat-
form and positioning the booms and platform while on the
job.
Use the following procedure to operate machine func-
tions using the upper controls.
1. At the lower controls, place the emergency stop
switch in the on position and turn the start switch on.
Place the controls switch in the platform position.
2. Enter the platform and securely close the gate.
3. Attach the fall restraint lanyard to one of the anchor
points.
4. Pull the emergency stop button out (refer to Figure
8.3).
Controls Switch
Start Switch
Ground
Controls
Switch
TB42J – 0172310