TRUCK SERVICE MANUAL
(2) Inspect gear teeth for wear that may have
destroyed the original tooth shape. If this condition is
found, replace the gear.
Fig. 1-5 Method of measuring clutch plate cone
(3) Inspect the thrust face of gears for scores,
scratches, and burs. Remove such defects with a soft
(3) The amount of cone in clutch plates is
stone. If scratches and scores cannot be removed with a
determined by measuring the distance between the
soft stone, replace the gear.
inside diameter of the plate and a level surface (fig. 4-5).
Discard plates having excessive cone (refer to wear
limits, Section 8). When assembling a clutch pack, soak
j. Inspecting Splined Parts. Inspect splined parts f
friction-faced clutch plates in transmission fluid for at
or stripped, twisted, chipped or burred splines. Remove
least 2 minutes and make sure that each plate is installed
burs with a soft stone. Replace the part if other defects
so that its cone is in the same direction as the cone of
are found. Spline wear is not considered detrimental
the adjacent plates.
except where it affects tightness of fit of the splined
k. Inspecting Threaded Parts. Inspect parts for
burred or damaged threads. Remove burs with a soft
is evidence of looseness due to relative motion, the
stone or fine file. Replace damaged parts.
assembly should be replaced.
l. Inspecting Snaprings. Inspect all snaprings for
p. Inspecting Balls in Clutch Housings. Inspect all
nicks, distortion, and excessive wear. Replace snapring if
balls in rotating clutch housings for free movement. Any
any of those defects is found. The snapring must snap
restriction could prevent the ball from seating during
tight in its groove for proper functioning.
m. Inspecting Springs. Inspect springs for signs of
overheating, permanent set, or wear due to rubbing
4-6. REMOVING (OR INSTALLING) TRANSMISSION
adjacent parts. Replace the spring if any one of these
defects is found. Refer to the spring chart at end of
a. Drain Oil. Drain the oil from the transmission
before removal from the vehicle (para 3-7). For better
drainage, the transmission should be warm and allowed
n. Inspecting Clutch Plates
to drain over night. Since a p p i c a t i o n s will differ,
consult the vehicle service manual for s p e c if i c
(1) Inspect friction-faced steel plates (internal-
instructions for transmission removal and installation.
splined plates) for burs, imbedded metal particles,
b. Check Linkages and Lines. Make sure that all
severely pitted faces, excessive wear, cone, cracks,
linkages, controls, cooler lines, modulator actuator cable,
distortion, and damaged spline teeth. Remove burs,
temperature connection, input and output couplings, and
using a soft honing stone. Replace plates which have
mounting bolts are disconnected before transmission
removal (also, oil filler tube and other equipment such as
attached parking brake handle, etc). Oil lines should be
(2) Inspect steel plates (externaltanged plates) for
carefully placed out of the way of damage and all
burs, scoring, excessive wear, cone, distortion, imbedded
metal, galling, cracks, breaks, and damaged tangs.
Remove burs and minor surface irregularities, using a
soft-honing stone. Replace plates which have other