Chevrolet 70 1969 Series, Shop Manual

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LUBRICATION 0-15
scoring and wear, good stability in storage and
service, and give good resistance to corrosion.
Suppliers should assure these characteristics, and
be responsible for the quality and satisfactory per­
formance of their products.
VISCOSITIES
R O C K W E L L A X L E S
In Rockwell axles, S .A .E . 140 should be used
the year around except in cases of extremely low
temperatures. If trucks are parked in temperatures
below + 20°F ., or operated in temperatures con­
sistently below 0 °F ., it is advisable to use S .A .E . 90.
O T H E R UNITS
S .A .E . 90 may be used the year around. If
truck is operated in temperatures consistently be­
low 0 °F ., use S .A .E . 80. If the truck is operated in
consistently high temperatures (over 100°F.),
S .A .E . 140 may be used.
REAR AXLE
C H E C K IN G L E V E L
Remove filler plug and if necessary, add suf­
ficient lubricant to bring level up to filler plug
Figure 14— Drain and Level Plugs— Typical Transmission
level. Install and tighten plug. On the forward rear
axle with torque divider, be sure that vehicle has
stood for at least 5 minutes before checking level;
than check level A T A X L E O N L Y .
D R A IN IN G A N D F IL L IN G
Check lubricant level every 6,000 miles.
Drain lubricant every 24,000 miles. If the truck is
operated in exceptionally heavy work or at con­
tinuous high speed, the lubricant should be changed
every 12,000 miles.
At specified intervals remove plug at bottom
of axle housing, also at bottom of torque divider
or inter-axle differential housing on tandem bevel
axles. Drain when unit is hot, preferably immed­
iately after operation. Reinstall drain plugs.
Fill axle to level of filler plug opening. On
tandem axles with torque divider, add specified
quantity through filler plug on side of case or add
two pints of lubricant at top of inter-axle differen­
tial housing.
S PECIAL A X L E LU B R IC A T IO N
Special lubrication is required on all 2-speed
and double reduction axles as follows: (1) when
axle has not been operated for a long period (2) has
been out of normal position or (3) after overhaul.
Add 1 pint of lubricant through plug opening in
top of pinion cage or differential carrier. Recheck
lubricant level at filler plug.
TRANSMISSION
Synchromesh (Incl. Auxiliary)
C H E C K IN G L E V E L (Fig. 14)
Every 6,000 miles or oftener under severe
operating conditions remove filler plug at side of
case and, if necessary, add sufficient recom­
mended lubricant to bring lubricant level up to
level of opening. Install and tighten filler plug.
Allison Automatic Transmission
Every 6,000 miles the fluid level should be
checked and fluid added as described below when
CHEVROLET SERIES 70*80 H EAVY DUTY TRUCK SH O P M A N U A L