Thomas SAF-T-LINER C2, Maintenance Manual

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26–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine or motor, set the parking brake, and chock
the tires. Before working under the vehicle, always
place jack stands under the frame rails to ensure
the vehicle cannot drop. Failure to follow these
steps could result in serious personal injury or
death.
26–01 Manual Transmission Oil
Level Checking
1. Park the vehicle on a level surface. Apply the
parking brake and chock the rear tires.
2. Clean the area around the fill plug, then remove
the plug from the side of the case.
3. Check that the oil is level with the lower edge of
the transmission fill opening. See
Fig. 1 .
IMPORTANT: A lubricant level close enough to
be seen or touched is not sufficient. It must be
level with the lower edge of the fill opening.
4. If needed, fill the transmission with oil until level
with the lower edge of the fill opening. See
Table 1 for approved lubricants.
For more information and a complete listing of
approved lubricants, refer to the Eaton website,
www.roadranger.com .
Eaton Approved Manual Transmission Lubricants
Lubricant Type
*
Temperature:
°F (°C)
SAE
Viscosity
Synthetic transmission
lubricant meeting Eaton PS-
386 lubricant specification
All —
Heavy-duty engine oil
meeting MIL-L-2104D or
Caterpillar TO-4 Specification
Above 10 (–12) 40 or 50
Below 10 (–12) 30
*
Lubricants listed in order of preference. Do not mix types of oil.
Table 1, Eaton Approved Manual Transmission
Lubricants
CAUTION
Operating a manual transmission with the fluid
level higher or lower than recommended can re-
sult in transmission damage. Do not overfill the
transmission; overfilling will force fluid out of the
case through the main shaft openings. Fluid over-
flow 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 oil addi-
tives or friction modifiers. Do not use multi-
viscosity oils or EP (Extreme Pressure) gear
oils. 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.
5. Clean the fill plug, then install it in the transmis-
sion. Tighten the plug as follows:
•
25 to 35 lbf·ft (34 to 48 N·m) for transmis-
sions with 3/4-inch pipe threads.
•
60 to 75 lbf·ft (81 to 102 N·m) for transmis-
sions with 1-1/4-inch pipe threads.
f260006b
10/05/94
A
B
A. Full B. Low
Fig. 1, Transmission Oil Level Checking
Transmission
26
Saf-T-Liner C2 School Bus Maintenance Manual, July 2020
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