CHEVROLET C/K 2003 Owners Manual

6-47 Electric Air Compressor (If Equipped)
Your vehicle may be equipped with an electric air
compressor. This compressor is used to run options that
require pressurized air, such as an air horn, air seat,
exhaust restrictor or an exhaust brake.
This air compressor is used when vehicles are not
equipped with an air brake system.
The air supply for this
system must be maintained
by releasing the drain
valve to eject any moisture
that may have built up in
the system.
It is recommended that this system be drained on a
weekly basis.
Clutch Pedal Free Travel
If you have a manual transmission, your clutch will need
adjustment when pedal free travel gets down to about
1/4 inch (32 mm), as measured at the clutch pedal pad.
You should have 1 1/2 to 2 inches (38 to 51 mm) of
clutch pedal free travel. See ªMaintenance Scheduleº in
the Index for more information.
If your clutch ever needs service, be sure to use only
genuine GM clutch replacement parts.
Chassis Lubrication
Your Maintenance Schedule provides all of the required
chassis lubrication intervals and identifies proper
lubricants to use. Be sure to see your Maintenance
Schedule before performing any chassis lubrication
service. To determine location of chassis lubrication
items, use the following charts.

6-48
Single Axle Models

6-49
ITEM NO. ITEM REMARKS
1
Brake Camshaft
One fitting each (apply sparingly).
2 Steering Column Slip Joint* One fitting.
3 Steering Drag Link Ends One fitting at each end.
4 Pivot Points and Hinges Apply chassis lubricant
5 Pivot Points and Hinges Apply chassis lubricant.
6
Slack Adjuster
One fitting.
7 Brake Cam Roller Pins at
interface of pin and shoe
Apply engine oil.
8 Front Steering Knuckles
One fitting each side, lower bushing (hand
-operated
grease gun only). Hand
-pack upper bearing.
9 Front Wheel Bearings
Hand
-pack or lubricate.
10 Steering Tie Rod Ends One fitting each end.
11 Spring Slip Pads*
(Multi
-Leaf Only)Apply chassis lubricant.

6-50
ITEM NO. ITEM REMARKS
12 Clutch Release Bearing* Cup or fitting.
13 Battery Terminal
(except ªSTº type)Keep coated with petroleum jelly.
14 Transmission Fill to level of filler plug.
15 Propshaft Slip Joints Lubricate with GM Part No. 1051344
Wheel Bearing Lubricant.
16 Parking Brake Clevis Pins$ Apply chassis lubricant.
17 Parking Brake Lever Pivot*$ Apply chassis lubricant.
18 Clutch Release Cross Shaft,
Master Cylinder$Apply chassis lubricant, Fill to 1/4, (6 mm) below opening.
19 Release Bearing,
Clutch Cross ShaftTwo fittings, Apply chassis lubricant
20 Clutch Release Fork Two fittings.
* Applies to some vehicles.

Applies to air brakes only.

Refer to Allison Transmission Operator's Manual.
$ Applies to hydraulic brakes only.

6-51
Tandem Axle Models
ITEM
NO. ITEM REMARKS
1 Brake Camshafts One fitting each.
2
Propshaft U
-JointOne fitting each joint.
Lubricate with
GM Part No. 1051344,
Wheel Bearing Lubricant.
4 Brake Shoe
Roller PinsApply engine oil at pin
to shoe joint only.
5 Rear Spring Pin One fitting each side.
6 Rear Axles Fill to level of filler plug.

6-52
Battery
Your new vehicle comes with one or more maintenance
free ACDelco
batteries. When it's time for a new
battery, be sure it has the replacement number shown
on the original battery's label. We recommend an
ACDelco battery.
WARNING: Battery posts, terminals and related
accessories contain lead and lead compounds, chemicals
known to the State of California to cause cancer and
reproductive harm. Wash hands after handling.
Vehicle Storage
If you're not going to drive your vehicle for 25 days or
more, remove the black, negative (
-) cable from the
battery. This will help keep your battery from running
down. (If your vehicle has more than one battery, be
sure to remove the negative (
-) battery cable from
each battery.)
CAUTION:
Batteries have acid that can burn you and gas
that can explode. You can be badly hurt if you
aren't careful. See ªJump Startingº in the Index
for tips on working around a battery without
getting hurt.
When you are ready to use the vehicle again, refer to the
engine starting procedure in the Index.
Contact your dealer to learn how to prepare your vehicle
for longer storage periods.

6-53
Windshield Wiper Blade
Replacement
Windshield wiper blades should be inspected at least
twice a year for wear or cracking. See ªWiper Blade
Checkº in the Index for more information.
Replacement blades come in different types and are
removed in different ways.
Here's how to remove the Shephard's Hook type:
1. Pull the windshield wiper arm away from the
windshield.
2. Push the release lever and slide the wiper assembly
toward the driver's side of the vehicle.
3. Install a new blade by reversing Steps 1 and 2.

6-54
Other Service Items
Fuel Filter (Gasoline Engines)
The steel fuel filter is located near the engine
compartment on the driver's side of the vehicle.
See your Maintenance Schedule for recommended
service intervals.If your vehicle is equipped with the optional Davco
spin
-on type filter, it is located on the driver's side
frame rail.
Fuel Filter (Diesel Engines)
If you have a diesel engine, your fuel filter is located in
the engine compartment on the driver's side of the
vehicle, or along the driver's side frame rail. See ªFuel
Filter Replacementº earlier in this section for further
information.
Also see your Maintenance Schedule for recommended
service intervals.

6-55 Primary Fuel Filter and Water Separator
(If Equipped)
If you have a diesel engine,
you may have this spin
-on
filter. It is located on the
driver's side frame rail.
It has a clear plastic drain bowl at the bottom. Check the
drain bowl occasionally for any water or particles.
To drain the bowl, do the following:
1. Shut off the engine.
2. Partially open the drain valve at the bottom of
the filter.
See ªEngine Oilº in the Index for proper disposal
procedures.
Secondary Fuel Filter and Water
Separator/Heater (If Equipped)
If you have a Caterpillar

diesel engine, you may also
have this spin
-on filter and
fuel separator/heater. It will
be mounted in the engine
compartment on the driver's
side of the vehicle.
It has a metal drain bowl at the bottom. Occasionally,
check the bowl for any water or particles.
To check or drain the bowl, do the following:

Shut off the engine.

Push up on the spring loaded drain valve until clear
fuel is flowing from the valve.
The particles or water will drain out first. See ªEngine
Oilº in the Index for proper disposal procedures.

6-56 Automatic Ether Injection System
(If Equipped)
If you have a Caterpillar
diesel engine, you may have
this feature. The ether
cylinder is located in the
engine compartment on the
driver's side of the vehicle.To change an empty ether cylinder, follow these steps.
1. Loosen the screw head on the cylinder
-to-bracket
clamp.
2. Spread the clamp apart.
3. Clean any dirt from the neck of the cylinder and the
top of the valve before you take out the cylinder.
4. Check the inside of the valve for any foreign matter.
Clean the valve as necessary.
5. Cover the valve to protect it from dirt and take out
the cylinder.
6. Install a new gasket whenever you take out the
cylinder. Use only one gasket and spread a light film
of clean oil on it before installation.
7. Put in the new cylinder. Turn it clockwise until it just
starts to contact the gasket.
8. Tighten the cylinder another half turn (180 degrees).
Don't over
-tighten.
9. Retighten the cylinder clamp.