Parking; Draw Bar Pull (Dbp), Definition; Automatic Electric Park Brake; Towing This Vehicle - Taylor-Dunn RE-380-36 Operator's And Service Manual

SAFETY RULES AND OPERATING INSTRUCTIONS

Parking

Before leaving the vehicle:
•
Set the parking brake.
•
Set the forward-off-reverse switch to the ` "OFF"
position.
•
Rotate the start switch to the "OFF" position.
In addition:
•
If parking this vehicle on an incline, turn the wheels
to the curb, or block the wheels.
•
Do not block fire aisles, emergency equipment,
stairways, or exits.

Draw Bar Pull (DBP), definition

DBP is a measure of pulling force required to move a
load. The load may be a trailing load or a pushed load. It
is normally expressed in pounds or Newtons.
The DBP of a tow tractor is the horizontal force exerted
on a load at its coupler while towing or pushing a load.
To measure the DBP, a scale would be connected in line
with the tractor coupler and the load. The scale will
directly read the DBP as the tractor tows the load.
Tow tractor DBP specifications, definition:
Normal DBP: Highest DBP that can be sustained for a
given duty cycle.
Ultimate DBP: Also referred to a Maximum DBP. Highest
DBP achieved while travailing at a minimum speed of
approximately 0.5 mph (0.8 kph)for a minimum of 30
seconds. This specification is used in calculations for
getting a load moving.
Notes:
Tow tractor DBP specifications are based on:
•
Road surface consisting of level dry clean asphalt,
brushed concrete or equivalent.
•
Maximum battery weight installed per tow tractor
battery specification.
Towing a load up any grade will significantly affect the
DBP required.
Most paved roads and parking lots have a drainage grade
to allow water to run off. When operating a tow tractor at
or near its maximum capacity, this drainage grade will
greatly affect DBP required to pull the load and may
exceed the tractor specifications.
Safety Rules
Page 12
This vehicle is equipped with regenerative
braking. Follow these steps before towing this
vehicle.
1. To tow this vehicle the start switch must be
in the "OFF" position.
2. Place the forward/reverse switch in the
center "OFF" position.
Failure to follow these instructions may result
in damage to the vehicle.
The park brake should be disabled for servicing
or towing procedures only. Do not operate the
vehicle while the automatic park brake is
disabled. Operating the vehicle with the
automatic park brake disabled could lead to
severe bodily injury and/or property damage.

Automatic Electric Park Brake

This vehicle may be equipped with an automatically
applied electric parking brake. Under normal driving
conditions, the parking brake will be applied when the
start switch is turned off or the operator leaves the driver
seat. It will also be applied if the control system loses
power such as when the emergency battery disconnect
switch (if equipped) is activated.
NOTE: The vehicle will come to an abrupt stop if the
start switch is turned off or the operator
leaves the driver seat while the vehicle is in
motion.
The parking brake is powered by the vehicle battery. It
will be applied whenever the batteries are disconnected.
It may be applied if the batteries are severely discharged.
If the vehicle power system fails and applies the brake,
the can be released by disconnecting the electric brake
from the control system and connecting a 20 to 24 volt
DC source (1.5A) to the electric brake.

Towing This Vehicle

To tow this vehicle, attach a tow strap to the front bumper
tow-bar.
NOTE: If the vehicle is equipped with the automatic
electric park brake, do not tow the vehicle
with the drive wheels on the ground.
Use another driver to steer this vehicle while it is being
towed. Be sure the driver uses the brakes when the
towing vehicle slows or stops. Do not tow the vehicle
faster than 5 m.p.h. or its maximum designed speed,
whichever is lower.
If at all possible, this vehicle should be placed on a carrier,
rather than towing.