18
Service and Maintenance
Transmission Operating Angles
If the transmission operating angle is more than 12 degrees, improper lubrica-
tion will occur. The operating angle is the transmission mounting angle in the
chassis plus the percent of upgrade (expressed in degrees).
For operating angles over 12 degrees, the transmission must be equipped
with an oil pump or cooler kit to insure proper lubrication.
Operating Temperatures with Oil Coolers
The transmission must not be operated consistently at temperatures above
250°F. However, intermittent operating temperatures to 300°F do not harm the
transmission. Operating temperatures above 250°F increases the lubricant's
oxidation rate and shortens its effective life. When the average operating tem-
perature is above 250°F, the transmission can require more frequent oil
changes or external cooling.
The following conditions in any combination can cause operating tempera-
tures of over 250°F:
• Operating consistently at slow speed.
• High ambient temperatures.
• Restricted air flow around transmission.
• Exhaust system too close to transmission.
• High horsepower operation.
External oil coolers are available to reduce operating temperatures when the
above conditions are encountered.
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