Chevrolet 30 Series 1967 Service Manual page 18

LUBRICATION 0-16
cylinder. Fill to plug level with Bendix Vacuum Cylinder
Oil or Delco shock absorber fluid or equivalent at 12,000
mile intervals or each six month period, especially prior
to the start of cold weather.
The Hydrovac assemblies are the diaphragm type.
CAUTION: These units do not require lubrica­
tion. Do not add oil of any type to diaphragm
chamber.
Vacuum brake air cleaner for frame mounted vacuum
boosters should be cleaned semi-annually.
STEERING GEAR
Conventional
Check lubricant level every 36,000 miles. If required,
add lubricant specified in Note 1 to level of filler hole.
On CA10, 20, 30, PA10 and GA10, 20 models, check
lubricant level in the following manner:
1. Remove the forward and outboard (lower and forward
on GA10, 20 models) steering gear cover attaching
screws.
2. On CA10, 20, 30 and PA10 inject lubricant specified
in Note 1 into forward cover attaching screw hole
until lubricant begins to come out of the outboard
screw hole. On GA10, 20 models, inject lubricant
into the lower hole until lubricant begins to come out
of forward hole.
3. Replace cover attaching screws.
On CA10, 20, 30 models equipped with power steering,
check steering gear lubricant in the following manner.
1. Remove the two inboard screws and remove the
power steering hose support bracket. Reinstall top
screw.
2. Remove outboard screw. Inject lubricant into cover
forward attaching screw hole until lubricant begins
to come out outboard hole.
3. Reinstall outboard screw and hose support bracket.
Power Steering
Service gear box in the same manner as prescribed
for the conventional steering gears. In addition, check
fluid in power steering pump reservoir - while hot and
wheels in full left turn position - make additions using
GM Power Steering Fluid or if not available use Auto­
matic Transmission Fluid - Type A with AQ-ATF-A
mark required to bring level to full mark on filler cap
dipstick.
PROPELLER SHAFT SLIP JOINTS
Propeller shaft slip joints should be lubricated every
6,000 miles with lubricant specified in Note 1.
UNIVERSAL JOINTS
Universal joints equipped with lubrication fittings,
should be lubricated every
specified in Note 1.
More frequent lubes may be required on heavy duty
or "off the road" operations.
miles with lubricant
6 , 0 0 0
BRAKE AND CLUTCH PEDALS
On Forward Control models the clutch pedal is lubri­
cated from a pressure gun lubrication fitting in the end
of the shaft and the brake pedal is also equipped with a
lubrication fitting.
On Forward Control models, the clutch idler support
is equipped with a lubrication fitting. Use lubricant
specified in Note 1 at these points.
SPEEDOMETER ADAPTER
On trucks so equipped, lubricate adapter at fitting with
lubricant specified in Note 1 every 6,000 miles.
PARKING BRAKE LINKAGE
Every 6,000 miles, clean and lubricate all parking
brake pivot points with lubricant specified in Note 1.
TACHOMETER-MECHANICAL
Lubrucate drive cable with lubricant specified in Note
every miles.
2 6 , 0 0 0
BODY LUBRICATION
Normal use of a truck causes metal-to-metal move­
ment at certain points in the cab or panel body. Noise,
wear and improper operation at these points will result
when a protective film of lubricant is not provided.
For exposed surfaces, such as door checks, door lock
bolts, lock striker plates, dovetail bumper wedges, etc.,
apply a thin film of light engine oil.
Where oil holes are provided in body parts, oil can
be safely used, but any lubricant should be used sparingly,
and after application all excess should be carefully wiped
off.
The seat adjusters and seat track, ordinarily over­
looked, should be lubricated with cup grease, graphite,
grease, chassis lubricant or oil - used sparingly.
There are other points on bodies which may occasion­
ally require lubrication and which are difficult to serv­
ice. Window regulators and controls are confined in the
space between the upholstery and the outside door panel.
Easy access to the working parts may be made by re ­
moving the trim . Door weatherstrips and rubber hood
bumpers should be lightly coated with a rubber lubricant.
DIESEL FUEL SPECIFICATIONS
The quality of the fuel oil used for high speed Diesel
engine operation is a dominating factor in satisfactory
engine life. Suitable fuel oil must be clean, completely
distilled, well refined, non-corrosive and be of low sul­
fur content.
DISTILLATION RANGE, CETANE NUMBER, and SUL­
FUR CONTENT are the three most important properties
of high-speed diesel engine fuel oils.
The following shows the specifications which must be
met in a suitable Diesel oil.
Engine operation at altitudes above 5,000 feet requires
use of next lighter class of fuel oil than would normally
be used.
CHEVROLET TRUCK SERVICE MANUAL