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insures the positive alignment of these bushings and their shafts
as well as the proper mesh of the gears.
Because of the high degree of accuracy to which these parts are machined, they
will not be serviced separately and can only be purchased as part of the gear
assembly.
In checking these bushings for wear a new shaft and a narrow feeler gauge of
the proper thickness should be used. The proper clearance between the gear and
its shaft should be .002" to .004".
Reassembly of Transmission
In reassembling the transmission it is very important that cleanliness be observed. It is also good practice to first put together the sub-assemblies that are a part of the transmission, so that all arbor press work is completed before going to the bench for reassembling the unit.
To replace the spline shaft bearing in the universal joint ball
retainer, expand the snap ring with a wedge-shaped tool and tap
the bearing into place.
Assemble the second speed gear front thrust washer and retainer
to the spline shaft. Assemble the second speed gear and the rear
thrust washer
Fig. 126— Method of Assembling Rear Thrust Washer
to the spline shaft with the grooves in the washer towards the
second speed gear. Fig. 126. Assemble the spline shaft and second
speed gear assembly into the bearing in the universal joint ball
retainer. It is important that the inner race of the rear bearing
be supported during this operation to prevent damage to the bearing.
Assemble sliding clutch sleeve to the spline shaft.
Press the bearing onto the main drive gear and lock it in place
with the snap ring. It is important that this bearing be supported
on its inner race to prevent damage to it during this operation.
Place idler gear in case with the chamfered gear to the rear of
case. Assemble the idler gear shaft, lining up the hole in the
shaft with the screw hole
55in the case and assemble the idler gear shaft lock screw. Assemble
the expansion plugs to both ends of the case.
Lubricate the countershaft gear thrust washer with heavy oil and
assemble it to the rear end of the case, lining up the raised part
with the cut in the case and assemble the counter gear to the case.
Assemble the countershaft from the rear end of the case and drive
into position.
Assemble the main drive gear bearing and retainer to the transmission.
Drive the bearing on the outer race and not on the end of the gear.
Driving on the end of the gear may drive the gear through the bearing
and result in a noisy bearing.
Dip the spline shaft pilot bearing in transmission lubricant and
assemble it to the inside of the main drive gear. Insert the first
speed gear into the transmission case with the fork channel to
the front. Assemble the spline shaft and torque ball retainer assembly
into the transmission and first speed gear. Bolt retainer securely
in place.
Place transmission in two gears at once to keep the gears and shafts
from turning and assemble the universal joint to the end of the
spline shaft. Assemble the universal joint ball and collar. Place
the gears in neutral position and assemble the gear shift guide
plate assembly in place. Assemble the top cover with the gear shift
lever to the trans-mission and check operation of the transmission.
Replacement in Chassis
When replacing the transmission in the chassis the operations are
just the reverse of the removal operations.
TRANSMISSION
(Master 1 Ton Trucks)
Construction
The four speed transmission used on the 1 1/2 -Ton Trucks is of
sturdy construction and is de-signed and built to operate with
the minimum amount of trouble in service. It is strictly a truck
type transmission with four speeds forward and one reverse.
The case is made from cast iron and all of the gears are machined
from drop forged steel gear blanks. The shafts are machined and
closely ground from the best grade of steel obtainable.
The main drive gear is supported by a heavy duty type New
Departure ball bearing. The main drive gear end of the spline shaft is supported
and runs in a Hyatt roller bearing while the rear end of the spline
shaft is supported on a New Departure ball bearing. Both ends of
the counter gear shaft are supported and run in heavy duty type
Hyatt roller bearings.
