ALLISON-OM1334EN
ALLISON AT, MT, HT SERIES ON-HIGHWAY TRANSMISSIONS
OPERATOR'S MANUAL
2000
ALLISON-OM1334EN - Page 31 of 48
26
PREVENT MAJOR PROBLEMS
Minor problems can be kept from becoming major problems if you
notify
maintenance personnel
when any of these conditions occur:
• Overheating
• Shifting feels odd
• Transmission leaks fluid
• Unusual transmission-related sounds (changes in sound level caused by
normal engine thermostatic fan cycling while climbing a long grade with a
heavy load have been mistaken for unusual transmission-related sounds).
IMPORTANCE OF PROPER FLUID LEVEL
Because the transmission fluid cools, lubricates, and transmits hydraulic power, it is
important that the proper fluid level be maintained at all times. If the fluid level is too
low, the converter and clutches will not receive an adequate supply of fluid. If the level
is too high, the fluid will aerate, the transmission will overheat, and fluid may be
expelled through the breather or dipstick tube.
Transmission Cross-Section Showing Internal Components
LOCKUP
CLUTCH
MODULATED
LOCKUP
VALVE
(OPTIONAL)
CONVERTER-DRIVEN
POWER
TAKEOFF
DRIVE
GEAR
MT 653DR
OIL
FILTER
CONTROL
VALVE
BODY
GOVERNOR
DRIVEN
GEAR
SPEEDOMETER
DRIVE
GEAR
LOW
CLUTCH
FIRST
CLUTCH
SECOND
CLUTCH
THIRD
CLUTCH
FOURTH
CLUTCH
FORWARD
CLUTCH
TORQUE
CONVERTER
V01960
Back to Top
