ALLISON-OM1334EN
ALLISON AT, MT, HT SERIES ON-HIGHWAY TRANSMISSIONS
OPERATOR'S MANUAL
2000
ALLISON-OM1334EN - Page 37 of 48
32
FLUID AND FILTER CHANGE INTERVALS
Fluid and filter change frequencies are determined as follows.
• Table 3 is a general guide. The fluid must be changed whenever there is
evidence of dirt or high temperature indicated by discoloration or strong odor.
More frequent changes may be required when operations are subject to high
levels of contamination or overheating.
• Fluid change intervals can be optimized by monitoring fluid oxidation
according to the tests and limits in the Fluid Contamination section of this
manual.
Table 3. Fluid and Filter Change Intervals
Transmission
Application
Fluid Change
Internal Sump
Filter
Governor
Filter
External
Auxiliary Filter**
AT 500
and 1500 Series
(On-Highway)
(Light-Duty)
(School Bus,
Motorhome, and
One-Way Rental)
Paper Filter:
25,000 miles
(40 000 km)
or 12 months*
Brass Filter:
50,000 miles
(80 000 km)
or 24 months*
Paper Filter
in Shallow
Pan (4.0 in.) or
Deep Pan (5.3 in.):
25,000 miles (40 000 km)
or 12 months*
Brass Screen Filter
in
Shallow Pan (4.0 in.) or
Deep Pan (5.3 in.):
50,000 miles (80 000 km)
with no time limit
At overhaul
After first 5000 miles
(8000 km) and at
25,000 miles
(40 000 km) or
12 months, thereafter
AT 500,
AT 500R,
and 1500 Series
(On-Highway)
(Heavy-Duty)
25,000 miles
(40 000 km)
or 12 months*
Paper Filter
in Shallow
Pan (4.0 in.) or Deep Pan
(5.3 in.): 25,000 miles
(40 000 km) or
12 months*
Brass Screen Filter
in
Shallow Pan (4.0 in.)
or Deep Pan (5.3 in.):
50,000 miles (80 000 km)
with no time limit
At overhaul
After first 5000 miles
(8000 km) and at
normal fluid change
intervals, thereafter
AT 500
and 1500 Series
(Off-Highway)
1000 hours
max
or 12 months*
Paper Filter
in Shallow
Pan (4.0 in.), or Deep Pan
(5.3 in.): at each oil
change interval
Brass Screen Filter
in
Shallow Pan (4.0 in.) or
Deep Pan (5.3 in.): at each
oil change interval*
At overhaul
After first 500 hours
and at normal oil
change intervals,
thereafter
MT 600 Series
(On-Highway,
Non-MT 643R)
25,000 miles
(40 000 km)
or 12 months*
Paper Filter:
25,000 miles (40 000 km)
or 12 months*
Stainless Steel Screen:
At overhaul
25,000 miles
(40 000 km)
or 12 months*
After first 5000 miles
(8000 km) and at
normal oil change
intervals, thereafter
(cont’d on next page)
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