Power Takeoff (PTO) Governor
Engine power takeoffs (PTO) are devices used to tap
into engine power to run auxiliary devices, such as
hydraulic pumps that power additional equipment.
The following instructions are general guidelines for
operating a PTO.
1.
Set the parking brake and put the transmission in
neutral.
2.
Press the dash-mounted PTO switch. Release
the switch when the amber light behind the
switch begins to blink.
When the light is steadily illuminated, the PTO is
engaged and ready to operate. In stationary
mode, the vehicle must remain in neutral with the
parking brake set.
3.
To activate the mobile mode, shift from neutral to
reverse, 1st, or 2nd gear. The clutch will open
and the PTO will disengage for a moment.
4.
Touch the throttle pedal to close the clutch and
engage the PTO in mobile mode. The PTO may
be operated with the transmission in reverse,
neutral, 1st, or 2nd gears only.
NOTE: Do not attempt to change gears while
the vehicle is moving. The transmission will ig-
nore the request.
5.
To end the mobile mode, bring the vehicle to a
stop. The clutch will open and shut down power
to the PTO.
6.
To resume stationary mode, shift to neutral. The
PTO will engage.
7.
To end stationary mode, press the dash switch.
When the light in the switch goes out, power to
the PTO is shut off.
Engine Braking
Each engine manufacturer uses a specific engine
brake for their engine. Regardless of the manufac-
turer, the engine brake is operated with the principles
outlined in this chapter. Refer to the engine manufac-
turer’s operation manual for details of their particular
engine brake product.
WARNING
To avoid injury from loss of vehicle control, do
not activate the engine brake system under the
following conditions:
•
on wet or slippery pavement, unless the
vehicle is equipped with antilock braking
system (ABS) and you have had prior expe-
rience driving under these conditions;
•
when driving without a trailer or pulling an
empty trailer;
•
if the tractor drive wheels begin to lock, or
there is fishtail motion after the engine
brake is activated.
Whenever vehicle braking is required on good road
conditions, the engine brake may be used in con-
junction with the service brakes. There is no time
limit for operation of the engine brake. However, an
engine brake does not provide the precise control of,
and is not a substitute for, service brakes.
WARNING
Usage of the engine brake as the primary braking
system can cause unpredictable stopping dis-
tances, that could result in personal injury or
property damage. Service brakes are the primary
vehicle braking system.
Two dash-mounted switches control the engine
brake:
•
The On/Off switch (ENG BRK), is used to turn
the engine brake on and off. See
When the engine brake is on, an amber light
will illuminate behind the switch.
•
The engine brake intensity switch (HI/MED/LO
or, in some cases, HI/LO) controls the amount
of engine braking. When the panel lights are
on, the ENG BRK legend is backlit in green.
10/17/2001
f610588
1
2
1.
Engine Brake On/Off
2.
Engine Brake Intensity Switch
Fig. 7.18, Engine Brake Switches
Engines
7.13
