ALLISON-OM1334EN
ALLISON AT, MT, HT SERIES ON-HIGHWAY TRANSMISSIONS
OPERATOR'S MANUAL
2000
ALLISON-OM1334EN - Page 30 of 48
25
PERIODIC INSPECTIONS
The ALLISON AUTOMATIC requires minimum maintenance. Careful attention to
the fluid level, selector linkage, and throttle (modulator) linkage is most important.
For easier inspection, the transmission should be kept clean. Report any abnormal
condition to your maintenance personnel.
Inspect the transmission for the following.
• loose bolts (transmission and mounting components)
• transmission fluid leaks*
• shift linkage freely positioned by transmission detent
• for mechanical modulator valve actuators:
— full (and ease of) movement of mechanical modulator linkage
— vacuum or air line and modulator for leaks
• for electrical modulator valve actuators: proper connections, wire routing and
operation
• damaged or loose hydraulic lines
• damaged or loose electrical harnesses
• worn or frayed electrical connections
• driveline U-joints and slip fittings
• speedometer cable and fittings
• PTO linkage and driveline
Inspect the transmission fluid for the following.
• Check transmission and dropbox fluid levels regularly. Once consistent daily
hot level checks have been established and daily inspection shows no sign of
transmission leakage, less frequent checks could be made.
• Check the engine cooling system occasionally for evidence of transmission
fluid, which would indicate a faulty cooler.
* Transmission fluid leaks require immediate attention.
CARE AND
MAINTENANCE
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