General Control Operation; Driving And Stopping Procedures; 2-4.1 Standard Travel; 2-4.2 Creep Travel - Big Joe PPT 45 Series Operation, Maintenance, Repair Parts

2-3. GENERAL CONTROL OPERATION

The speed control (Figure 2-1), located on each side of
the control head, provides fingertip control for driving
the truck. Rotating, or pressing the speed control
downwards moves the truck in the FORWARD
direction. As the speed control is pressed, it closes
electrical contacts for first speed, or creep, in the
forward direction. Pressing the speed control farther
increases the speed of the truck. The speed control is
infinitely variable, which means that the farther the
control is pressed, the faster the truck will move.
NOTE: The truck is equipped with a High Speed
Cutout Switch, located on the control head,
higher travel speeds will be available. With this
switch in the OFF position, standard travels
speeds are available. Place the switch in the
ON position to enable the highest travel
speed.
Rotating or pressing the speed control upwards moves
the truck in the REVERSE direction. The upper portion
of the speed control controls the reverse speeds in the
same manner.
The pushbutton switches, located behind the belly
button switch guard, activate the lift-lower controls and
the horn.
The brake is applied by lowering or raising the steering
arm. When the steering arm is lowered or raised
approximately half way the brakes are partially applied.
When the steering arm is raised completely vertical,
the brakes are fully applied. (See Figure 2-2) All
traction control power is shut off when the brake is
engaged. When the steering arm is in the upright
position, the brake acts as a parking brake. Deadman
braking occurs when the handle is released and spring
action raises it to the upright position.

2-4. DRIVING AND STOPPING PROCEDURES

2-4.1 Standard Travel

1. If equipped, turn on the key switch. Grasp the grips
of the steering arm so that the speed control can
be comfortably operated by either thumb.
2. Lower the steering arm to a comfortable position
above horizontal to disengage the brake and to
energize the electrical circuits.
3. To move forward (with load trailing), slowly press
the speed control downwards. Press the forward
speed control farther to increase speed. If
engaged, the High Speed cutout switch will disable
the highest travel speeds.
2-2
4. To slow down or stop, release the speed control
and lower or raise the steering arm to the
horizontal or vertical position. In those positions,
the brake pads apply pressure to the brake disc
slowing or stopping the truck.
NOTE: Procedures for movement in reverse are
the same as in the forward direction.
5. To travel in reverse, lower steering arm to a
comfortable position above horizontal and slowly
press the speed control upwards.

2-4.2 Creep Travel

1. Creep, or the slowest travel speed, is available in
both forward and reverse.
2. Lower the handle from the vertical position until
you hear a "click" which indicates that the controls
are energized. See Figure 2-2.
3. Rotate the speed control for either forward or
reverse travel.
IMPORTANT
With the control handle in the creep position, creep
speed will be the only speed available no matter how
far the speed control is rotated.
Brake Dis-engaged,
Forward/Reverse
Creep Speed Enabled,
All Controls Energized
Brake Dis-engaged,
All Controls Energized
Brake Fully Engaged
Controls De-energized
Figure 2-2. Brake Arm Actuation
Brake Fully Engaged
Controls De-energized
I-7004
PPT0104-901336