7-50
Published 01-29-2014, Control # 496-00
POWER TRAIN TMS800E SERVICE MANUAL
• Air System and Connections. Check for leaks, worn
air lines, loose connections, and capscrews.
• Clutch Housing Mounting. Check all capscrews in the
bolt circle of the clutch housing for looseness.
• Clutch Release Bearing. Remove the hand hole cover
and check radial and axial clearances in the release
bearing. Check the relative position of the thrust surface
of the release bearing with the thrust sleeve.
• Clutch Pedal Shaft and Bores. Pry upward on the
shafts to check wear. If excessive movement is found,
remove the clutch release mechanism and check the
bushings in the bores and wear on the shafts.
• Gear Lubricant. Change at the specified service
intervals. Use only gear oils as recommended.
• Filler and Drain Plugs. Remove the filler plugs and
check the level of lubricant at specified intervals. Tighten
the filler and drain plugs securely.
The following check can be made with the drive line dropped.
• Universal Joint Companion Flange Nut. Check for
tightness. Tighten to recommended torque.
The following checks can be made with the universal joint
companion flange removed.
• Output Shaft. Check splines for wear from movement
and chucking action of the universal joint companion
flange.
• Main Shaft Rear Bearing Cover. Check oil seal for
wear.
TRANSMISSION SHIFT AIR SYSTEM
Description
The shift air system controls the selection of the transmission
ranges and is comprised of an air valve, air regulator, air
filter, range control valve, a range shift cylinder, and the
necessary connecting piping.
The range control valve is located on the shift lever in the
cab, and the other valves and cylinders are mounted on the
transmission.
Theory of Operation
The range control valve has two positions HIGH (button up)
and LOW (button down). There are two air lines connected
between it and the air valve. One of these is the supply line
from the regulator, while the other is the air return to the air
valve.
When the range control valve is in the LOW position, air is
exiting the range control valve and enters the slave air valve
where it shifts the piston. This allows the air from the
regulator to exit the bottom port of the air valve, enter the low
range air port of the auxiliary shift cylinder, and shift the low
speed gear.
When the range control valve is in the HIGH position, air is
prevented from exiting the range control valve. This allows
the air entering the slave air valve from the regulator, to
move the piston routing the air out of the valve to the high
range port of the auxiliary shift cylinder. This moves the shift
bar shifting the high speed gear.
In addition to the range control button, a LO-LO button is
incorporated to select two extra low gears.
Reference Only
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