2002 CHEVROLET C3500 HD Owners Manual

4-37 When You Are Ready to Leave After
Parking on a Hill
1. Apply your regular brakes and hold the pedal down
while you:

start your engine,

shift into a gear, and

release the parking brake.
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the chocks.
4. Stop and have someone pick up and store the chocks.
Maintenance When Trailer Towing
Your vehicle will need service more often when you're
pulling a trailer. See the Maintenance Schedule for
more on this. Things that are especially important
in trailer operation are automatic transmission fluid
(don't overfill), engine oil, axle lubricant, belts, cooling
system and brake system. Each of these is covered in
this manual, and the Index will help you find them
quickly. If you're trailering, it's a good idea to review
these sections before you start your trip.
Check periodically to see that all hitch nuts and bolts
are tight.
Trailer Wiring Harness
Power Winches
If you wish to use a power winch on your vehicle,
only use it when your vehicle is stationary or anchored.
NOTICE:
Using a power winch with the transmission in gear
may damage the transmission. When operating
a power winch, always leave the transmission
in NEUTRAL (N).
Use the regular brakes, set the parking brake, or block
the wheels to keep your vehicle from rolling.

4-38 Power Take-Off (PTO) Engine Speed
Control (If Equipped)
NOTICE:
If you have a PTO that will exceed 35 hp
installed on your vehicle, it could damage the
transmission. When having a PTO installed
on your vehicle, make sure that it will not
exceed 35 hp.
Before using a PTO, refer to the manufacturer's or
installer's instructions.
NOTICE:
Using a PTO while operating in one place
before the vehicle has reached normal operating
temperature can damage the transmission.
If you will be using the PTO while operating in
one place, drive and warm up the vehicle before
using the PTO.
To engage PTO for stationary applications
(manual transmission):
1. Hold the clutch pedal down.
2. Set the parking brake.
3. Shift the transmission into NEUTRAL.
4. Engage the PTO. Refer to the manufacturer's or
installer's instructions on electrically engaged PTOs.
5. For mobile operations, shift the transmission into the
gear you want, apply the regular brakes and release
the parking brake. For stationary operations, leave
the parking brake applied.
6. Release the clutch and regular brakes as you
normally would. When the clutch is released,
the PTO will start.
7. Turn the PTO rotary switch to ON.

4-39
NOTICE:
Using a PTO for more than four hours without
driving your vehicle can damage the transmission.
If using a PTO for more than four hours without
driving your vehicle, drive your vehicle for a while
to allow the transmission to cool.
Preset Mode: PTO speed control mode is used for
stationary applications. This mode provides a default
standby speed of 850 rpm (800 rpm with automatic
transmission) and two default PTO operation speeds
which follow:
1. PTO Set Speed of 1250 rpm, or
2. PTO Resume Speed of 1700 rpm.
The standby speed (800/850 rpm) is not to be used
as a PTO control speed. Vehicles not equipped with
cruise control will not have the resume speed capability.Using PTO speed control in Preset Mode
(Factory Setting):
1. Engage the PTO.
2. Select PARK (P) or NEUTRAL (N) range.
Apply the parking brake if NEUTRAL (N)
is selected.
3. Make sure your foot is off the brake pedal
(and off the clutch on vehicles equipped with
a manual transmission). Select the desired
engine speed for PTO operation. Be sure to
read the following Preset Mode information
regarding operation.
To engage PTO for mobile applications
(manual transmission):
If you are going to drive the vehicle, shift the
transmission into the gear you want, apply the
regular brakes and release the parking brake.
Release the clutch (and the regular brakes) as you
normally would. When you release the clutch,
the PTO will start.

4-40
To engage a PTO while the vehicle is moving:
1. Hold the clutch pedal down.
2. Shift the transmission into NEUTRAL.
3. Engage the PTO.
4. Shift the transmission into the gear you want.
5. Release the clutch as you normally would.
When you release the clutch, the PTO will start.
Variable Mode: PTO speed control mode can be used
for both stationary and mobile applications. This mode
allows PTO to be controlled in a fashion similar to how
cruise control sets vehicle speed. The operator can set an
rpm (between 800 and 2200) with the cruise control
feature or with the SET position on the PTO switch.
The operator is then able to increase rpm in increments
of 100, or ªtap,º with the resume position on the
cruise control. Or, the operator can decrease rpm in
increments of 100 with either of the SET switches on
the PTO or the cruise control. Vehicles not equipped
with cruise control will not be able to increase in
100 rpm increments.Using PTO speed control in Variable Mode:
1. Engage the PTO.
2. Make sure your foot is off the brake pedal
(and off the clutch for vehicles equipped with
a manual transmission).
3. Select the desired engine speed (with the foot pedal)
and select SET on the PTO switch or with the
cruise control.
Engine speed will be governed to the PTO maximum
engine speed (2,200 rpm) while in either the preset or
variable PTO modes. All engine speed values listed
above are factory preset values. With the exception of
the ªtapº increment (100 rpm), all of these values are
programmable and can be adjusted by your GM dealer
or body upfitter. If the PTO software settings do not
match the settings shown here, then they may have
already been altered in order to satisfy the requirements
of the installed PTO system and body equipment.

5-
5-1
Section 5 Problems on the Road
Here you'll find what to do about some problems that can occur on the road.
5
-2 Hazard Warning Flashers
5
-2 Other Warning Devices
5
-3 Jump Starting
5
-9 Towing Your Vehicle
5
-9 Engine Overheating (Gasoline Engine)5
-13 Cooling System (Gasoline Engine)
5
-21 Engine Fan Noise
5
-21 If a Tire Goes Flat
5
-22 Changing a Flat Tire
5
-23 If You're Stuck: In Sand, Mud, Ice or Snow

5-2
Hazard Warning Flashers
Your hazard warning flashers let you warn others. They
also let police know you have a problem. Your front and
rear turn signal lamps will flash on and off.
The hazard warning flasher
button is located at the top
of the steering column.
Your hazard warning flashers work no matter what
position your key is in, and even if the key isn't in.
Press the button to make the front and rear turn signal
lamps flash on and off. Press the button again to turn the
flashers off.
When the hazard warning flashers are on, your turn
signals won't work.
Other Warning Devices
If you carry reflective triangles, you can use them to
warn others. Set one up at the side of the road about
300 feet (100 m) behind your vehicle.

5-3
Jump Starting
If your battery (or batteries) have run down, you may
want to use another vehicle and some jumper cables to
start your vehicle. Be sure to follow the steps below to
do it safely.
CAUTION:
Batteries can hurt you. They can be
dangerous because:

They contain acid that can burn you.

They contain gas that can explode or ignite.

They contain enough electricity to
burn you.
If you don't follow these steps exactly, some or all
of these things can hurt you.
NOTICE:
Ignoring these steps could result in costly damage
to your vehicle that wouldn't be covered by
your warranty.
The ACDelco battery in your vehicle has a
built
-in hydrometer. Do not charge, test or jump
start the battery if the hydrometer looks clear
or light yellow. Replace the battery when there
is a clear or light yellow hydrometer and a
cranking complaint.
Trying to start your vehicle by pushing or pulling
it won't work, and it could damage your vehicle.
1. Check the other vehicle. It must have a 12-volt
battery with a negative ground system.
NOTICE:
If the other system isn't a 12-volt system with a
negative ground, both vehicles can be damaged.

5-4
If your vehicle has more than one battery, use the
battery that's closer to the starter
-- this will reduce
electrical resistance.
2. Get the vehicles close enough so the jumper cables
can reach, but be sure the vehicles aren't touching
each other. If they are, it could cause a ground
connection you don't want. You wouldn't be able to
start your vehicle, and the bad grounding could
damage the electrical systems.
3. To avoid the possibility of the vehicles rolling, set
the parking brake firmly on both vehicles involved in
the jump start procedure. Put an automatic
transmission in PARK (P) or a manual transmission
in NEUTRAL before setting the parking brake.
NOTICE:
If you leave your radio on, it could be badly
damaged. The repairs wouldn't be covered by
your warranty.
4. Turn off the ignition on both vehicles. Unplug
unnecessary accessories plugged into the cigarette
lighter or accessory power outlets. Turn off the radio
and all lamps that aren't needed. This will avoid
sparks and help save both batteries. And it could
save your radio!
5. Open the hoods and locate the batteries. Find the
positive (+) and negative (
-) terminal locations
on each vehicle. On vehicles equipped with dual
batteries, make any battery connections to the
primary battery located on the passenger's side of the
vehicle. See ªEngine Compartment Overviewº in the
Index for more information on location.
CAUTION:
If your vehicle has air conditioning, the auxiliary
electric fan under the hood can start up even
when the engine is not running and can injure
you. Keep hands, clothing and tools away from
any underhood electric fan.