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102D SERIES MAINTENANCE MANUAL
INDICATOR
LAMPS
Figure. 10-Speed Auto-Shift
OPERATION
To convert the constant high-speed, high-torque,
rotational energy of the engine into a variable speed,
higher torque low-inertia rotation that can be used to
move the coach, the transmission must be able to be
shifted from one gear range to another. Gear shifts are
accomplished through an arrangement of four fork
actuated sliding clutch gears positioned along the
mainshaft of the transmission.
Input shaft rotation is transmitted to twin countershafts
either side of the mainshaft. The countershafts are fitted
with gears that continuously rotate and rotate a mating
gear on the mainshaft. Rotating mainshaft gears are not
directly coupled to the mainshaft, therefore, shaft rotation
is achieved only by engagement of the slide clutch gears.
Each sliding fork of the shift bar housing is attached to
one of the sliding clutch gears. As a shift fork is indexed
for a specific speed via the remote shift control, the clutch
gear moves to engage the inner gear of the adjacent front
or rear mainshaft floating gear. Engagement into the
rotating mainshaft gear causes the slide gear to rotate
and turn the mainshaft and output shaft. The selection
and engagement of a specific gear thereby increases or
decreases the output shaft speed of the transmission.
The RTLO-14610-A uses a splitter air cylinder to shift
the slide clutch gear that either engages or disengages
the the splitter gear, which in turn engages or disengages
the front box from the rear auxiliary box and countershaft.
Shifting
of
the
transmission is performed through the electronic lever or
touch pad shift selector module. into the "D" (drive) range
will allow the electronic control system ECU to
automatically upshift or downshift the transmission as
13 ---TRANSMISSION
GEAR SELECT
LEVER DETENT
BUTTON
RTAO-1470-B-AS
auto
needed. The clutch must be used (disengaged) when
shifting into the "D" range from any other previously
selected gear. This electrically shifted transmission also
utilizes and control the air actuated range cylinder
operations for range shift functions.
PERIODIC INSPECTIONS
Every 5,000 miles (8,000 km) or 150 operating hours
C0383
clean the exterior of the transmission and make the
following inspections:
1. Check all transmission to engine mounting
fasteners.
2. Check for any loose electrical harnesses or air line
connections.
3. Remove filler plug or dipstick and check lube oil
level. Check for any oil leaks.
4. Check for correct adjustment and operation of
clutch release mechanism.
5. Clean al dirt, dust and foreign objects off the shift
selector module. Keep foreign objects and liquids away
from shift console.
LUBRICATION
The transmission is designed so that all internal parts
including gears, bearings and shafts are either splash
lubricated, or operate in an oil bath that is circulated by
the motion of the gears and shafts. Always maintain
proper lube oil levels to assure a protective oil film on all
loaded surfaces of gears and bearings. If fluid level is too
low, metal to metal contact which causes scoring,scuffing
and seizure could occur.
NOTE: If the level is too high, oil may be forced out of
the case through the mainshaft openings.
shift
Initial Service Interval
The initial "factory fill" lubricant should be drained
between the first 3,000 to 5,000 miles (4,827 to 8,045 km).
August 2000
13A2-3
MAINTENANCE
Date
Page
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