Transmission appearance may differ, procedure is the same.
16
Timing
Timing Procedures
It is essential that both countershaft assemblies of the
front and auxiliary sections are "timed." This assures
proper tooth contact is made between mainshaft gears
seeking to center on the mainshaft during torque
transfer and mating countershaft gears that distribute
the load evenly. If not properly timed, serious damage
to the transmission is likely to result from unequal
tooth contact causing the mainshaft gears to climb out
of equilibrium.
Timing is a simple procedure of marking the
appropriate teeth of a gear set prior to installation and
placing them in proper mesh while in the
transmission. In the front section, it is necessary to
time only the drive gear set. And depending on the
model, only the LO range, deep reduction, or splitter
gear set is timed in the auxiliary section.
Front Section
A. Marking countershaft drive gear teeth.
1. Prior to placing each countershaft assembly into
the case, clearly mark the tooth located directly
over the drive gear keyway as shown. This tooth
is stamped with an "O" to aid identification.
B. Marking main drive gear teeth.
1.
Mark any two adjacent teeth on the main drive
gear.
2.
Mark the two adjacent teeth located directly
opposite the first set marked on the main drive
gear. As shown to the left, there should be an
equal number of unmarked gear teeth on each
side between the marked sets.
1
1
2