Snorkel TB120 2001 - Manual (Page 33)

6. CONTROLS
6 - 4 P/N 0191914
T
PLATFORM-CONTROL BOX
Controls for operating the TB120 from the
platform are located on the platform-control
box, with the exception of the yellow foot switch
which is on the platform floor.
NOTE: The number of each control below
corresponds to the control’s call-out on the
next page.
1. EMERGENCY STOP: Press the large red
button down at any time, under any conditions,
and the entire machine stops — the engine
turns off, the brakes automatically set, and
nothing moves. This switch must be pulled to its
up (or out) position if the TB120 is to be
controlled from the platform.
2. EMERGENCY POWER OPERATION: If the
engine stops and cannot be restarted, hold the
switch toward you and a small, battery-powered
hydraulic-pump comes on to supply power for
the machine. Boom movements will be slow
and have long lag times under EMERGENCY
POWER.
3. ENGINE THROTTLE: Leave this switch set
on LO unless you want to
drive at maximum
speed (see DRIVE RANGE below).
4. PLATFORM ROTATION: CW rotates the
platform clockwise (as seen from above)
relative to the end of the tip boom. CCW
rotates the platform counterclockwise.
5. PLATFORM LEVEL: UP rotates the platform
up relative to the end of the tip boom. DN
(down) rotates the platform down.
6. DRIVE RANGE: This switch works with the
HIGH RANGE SPEED SELECTOR VALVE that
is on top of the chassis near the rotation
bearing. Together with the position of the main
boom, the switch and valve determine how fast
the TB120 can travel along the ground. See the
DRIVE RANGE Table below for settings and
maximum speeds. Switching from LO to HI
changes the driving conditions from low speed
and high torque to the wheels to high speed
and low torque to the wheels.
C A U TIO N
Prolonged driving in HI (3 mph, 4.8 km/hr)
heats the hydraulic oil. Periodically check the
thermometer at the hydraulic-oil tank sight-
glass. Do not let the oil exceed 200°F (93°C).
Stop the engine and let the oil cool if
necessary.
DRIVE RANGE Table
MAX.
SPEED
DRIVE
RANGE
HRSS
VALVE
boom
position
3.0 mph
(4.8 km/h)
HI up stowed
1.5 mph
(2.4 km/h)
HI down stowed
0.75 mph
(1.2 km/h)
LO -- stowed
0.75 mph
(1.2 km/h)
-- -- extended but
below mid-
elevation
creep -- -- above mid-
elevation
NOTE: ENGINE THROTTLE, at the platform-
control box, must be set to HI for MAX. SPEED.
7. MAIN BOOM EXTEND/RETRACT: EXTEND
extends the booms. RETRACT retracts the
booms. Speed of movement is proportional to
how far you push the controller.
8. ANTI-RESTART MASTER SWITCH: This
switch works like an automobile ignition switch.
Hold it at START until the engine starts then
release it to ON. If the engine dies in ON, the
key must be turned to OFF before it will go
back to START. Turn the switch to OFF if the
platform is to stay in one position for a long
time, that will turn the engine off and save fuel.
9. HORN: See ”SAFETY DEVICES” chapter.
10. Foot Switch: You must step down on the
foot switch, and hold it down, any time you use
any platform control that causes the platform to
move. Stepping on the foot switch increases
the engine speed and activates other
switches/controls in preparation to do work.
(The foot switch is to the platform what the
GROUND OPERATION switch is to the ground-
control box.)