Meritor Transmission Lubricant Capacities
Transmission Model
Refill Capacity
*
in Quarts (liters)
–115A/B/C/R (all) 10.0 (9.5)
–125A/B/C/R (all)
–135A/B/C/R (all) 10.25 (9.7)
–145A/B/C/R 10.25 (9.7)
–155A/B/C/R (all)
–165A (all)
Meritor 13-Speed RMO Series
RMO13–145A 11.0 (10.4)
*
Quantities listed are approximate. Fill the transmission until the lubricant
is level with the bottom of the fill hole, with the vehicle in normal operating
position.
Table 3, Meritor Transmission Lubricant Capacities
CAUTION
Operating a manual transmission with the oil level
higher or lower than recommended can result in
transmission damage. Do not overfill the transmis-
sion; overfilling will force oil out of the case
through the main shaft openings. Oil overflow
may also drain onto the clutch or clutch brake,
causing additional problems.
IMPORTANT: Do not mix types of oil, because
of possible incompatibility. Do not use multi-
viscosity oils or EP (Extreme Pressure) gear
oils. Do not use oil additives or friction modifi-
ers. If switching from a petroleum based lubri-
cant to a synthetic, all areas of each affected
component must be thoroughly drained. Switch-
ing to a synthetic lubricant, when a petroleum-
based lubricant has been used for 50,000 miles
(80 000 km) or longer, may affect transmission
performance. Monitor all seal areas for the first
10,000 miles (16 000 km) after changing to a
synthetic from a petroleum-based lubricant.
NOTE: The correct oil level is established by
checking the fill plug opening.
2. Clean the fill plug, then install it in the gear case.
Tighten the plug as follows:
• 25 to 35 lbf·ft (34 to 48 N·m) for Eaton
Fuller transmissions with 3/4-inch pipe
threads.
• 60 to 75 lbf·ft (81 to 102 N·m) for Eaton
Fuller transmissions with 1-1/4-inch pipe
threads.
• 35 to 50 lbf·ft (48 to 67 N·m) for all Meritor
transmissions.
• 42 lbf·ft (57 N·m) for all Mercedes-Benz
transmissions.
26–03 Allison, Eaton Fuller,
and Meritor
Transmission Breather
Checking
Transmission housing breathers must remain clear. A
plugged breather could result in pressure build-up,
which could cause oil leakage.
If the breather is plugged, clean or replace it. See
Fig. 2. Check more often if the vehicle is operating
under very dusty conditions.
f260007a
05/27/93
Fig. 2, Transmission Breather (Eaton Fuller shown)
Transmission26
Business Class Trucks Maintenance Manual, February 200326/4
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