Transmission; Chassis Lubricant - Symbol " C; C" Chassis L U B R Ic A N T - GMC 4000 Series Service Manual

follows: (1) when axle has not been operated for a
long period (2) has been out of normal position or
(3) after overhaul.
Add one pint of lubricant through plug opening
in top of pinion cage or differential carrier. Re­
check lubricant.level at filler plug.

TRANSMISSION

CHECKING LEVEL (Fig. 13)
At specified intervals remove filler plug at
side of case and, if necessary, add sufficient rec­
ommended lubricant to bring lubricant level up to
level of opening. Install and tighten filler plug.
DRAINING AND FILLING (Fig. 13)
When transmission is new, or after overhaul,
it is recommended that lubricant be drained after
the first 3,000 m iles of operation, and thereafter
at recommended intervals. Draining at early m ile­
age removes fine metal or other foreign material.
At specified intervals, preferably immediately
after operation while unit is hot, remove plug to
drain lubricant. Clean drain plug, then reinstall
The lubricant indicated by symbol "C" on charts
should be a high grade pressure gun lubricant.
Good quality lithium soap multi-purpose grease
is recommended, especially for extreme operating
conditions - water, heat, etc.
UNIVERSAL JOINTS
At specified intervals, use pressure gun to
apply lubricant through fitting in universal joint
trunnion. Apply until lubricant is forced out around
all four trunnion seals (fig. 14). Good quality Lith­
ium soap multi-purpose grease is recommended.
APPLYING CHASSIS LUBRICANT
All lubrication fittings must be clean before
applying lubricant. Always be sure equipment used
in applying lubricant is clean. Every precaution
should be taken to prevent entry of dirt, grit, lint,
or other foreign matter into lubricant containers.
Fittings that have become broken or damaged
should be replaced with new part, and can be re­
moved with a wrench or suitable extracting tool.
COLD WEATHER PREPARATION
When hard steering is encountered as a result
of cold weather, the steering system should be lu­
bricated as follows:
G M C S E R V I C E M A N U A L
Filler P lu g
Figure 13— Transmission Drain and Level Plug (Typical)
and tighten securely. Refill to level of filler plug
opening as directed above. Use S.A.E. 90 the year
around in transm issions.
CHASSIS LUBRICANT
(SYMBOL "C" ON CHARTS)
Multi-Purpose Grease (N.L.G.I. #0) to lubricate
all steering linkage such as steering knuckles, tie
rod ends, and (if used) power steering booster cyl­
inder ends. In warmer weather, relubricatelinkage
with chassis grease previously recommended.
D ra in P lug
Use steering gear lubricant (Symbol "SG") or
U - J O IN T F IT T IN G
Figure 14— U niversal a n d Slip Joint Lubrication
Sec. 0
Page 13
LUBRICATION
TP M -8839
T-2451