Automatic Transmission Fluid - Symbol "S19; Power Steering System; High Temperature Grease - Symbol "S28; Stopmaster Brake Unit - GMC 4000 Series Service Manual

Sec. 0
Page 16
LUBRICATION
The fluid indicated by the symbol "S19" must
be an "Automatic Transmission Fluid," which has
been tested and approved and qualified to bear GM
trademark "DEXRON." DO NOT USE ANY OTHER
FLUID.

POWER STEERING SYSTEM

Power steering system reservoir is located on
power steering hydraulic pump (fig. 16). Reservoir
is marked with an "OIL LEVEL" mark. Use only
"Automatic Transmission Fluid GM DEXRON."DO
NOT USE HYDRAULIC BRAKE FLUID, SHOCK
ABSORBER FLUID, OR SIMILAR OIL.
Fluid level should be kept at "OIL LEVEL"
mark on reservoir. After cleaning reservoir and
cover, loosen cover bolt and remove. Using a clean
receptacle, pour fluid through a 200-mesh screen
- NOT A CLOTH STRAINER. Keep fluid clean and
free from water.
For cold weather preparation on steering link­
age refer to information under "Chassis Lubricant"
(Symbol "C") in this section.
Figure 16— Power Steering Fluid System Reservoir (Typical)
The lubricant indicated by the symbol "S28"
must be a water-proof, non-soap, smooth fibre
grease having a #1 N.L.G.I. stable consistency,
and must withstand extended high temperatures.
G M C S E R V I C E M A N U A L

AUTOMATIC TRANSMISSION FLUID

(SYMBOL "S I 9 '
HIGH TEMPERATURE
(SYMBOL "S28'
ON CHARTS)
BLEEDING SYSTEM
Whenever a line is disconnected or a pump is
replaced, the air that has entered the hydraulic
system must be bled out, otherwise noisy and un­
satisfactory operation will result.
ALLISON AUTOMATIC TRANSMISSION
Allison Automatic Transmission is filled with
GM DEXRON Automatic Transmission Fluid at the
factory. DO NOT MIX TYPES OF FLUID.
CHECKING FLUID LEVEL
Dipstick and filler tube are located at right
side.
1. Apply PARKING BRAKE FIRMLY AND
BLOCK WHEELS. Start engine and warm fluid to
operating temperature.
IMPORTANT: Do not operate retarder while
warming fluid. Move selector lever through all
speed ranges.
2. Run engine at "IDLE" speed with lever in
"N" (Neutral).
3. Clean dipstick and adjacent area, then re­
move dipstick, clean, re-insert, again remove and
note fluid level.
4. Add one quart of fluid when level reaches
"ADD" mark.
DRAINING AND FILLING
When new, or after overhaul, drain fluid and
change filter element after 3,000 m iles, thereafter
at recommended intervals. Drain while fluid is at
operating temperature.
1. Loosen acorn nut which secures filter cover
to oil pan.
2. When drainage is complete, remove acorn
nut, washer, cover, gasket, retainer, and filter
element.
3. Install new element in reverse order of
removal. Tighten nut to 8 to 10 foot-pounds torque.
4. Pour eight quarts of fluid into transmission
using clean container and spout, or funnel.
5. Start engine and check fluid level. Add fluid
as necessary to bring level up to markon dipstick.
DO NOT OVERFILL.
GREASE (SPECIAL)
ON CHARTS)

STOPMASTER BRAKE UNIT

At time of assembly after overhaul apply
above lubricant to areas indicated in "AIR BRAKES"
(SEC. 5B) of this manual.