Thomas SAF-T-LINER C2, Maintenance Manual

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3. Using a wrench or a socket, loosen the desiccant
cartridge bolt. Then separate the desiccant car-
tridge from the end cover.
4. Pull the cartridge bolt out of the end of the cover
and remove the cartridge.
Do not attempt to disassemble the desiccant
cartridge assembly. Parts for the assembly are
not available and the cartridge contains a 150 lb
spring that cannot be mechanically caged.
5. Remove and discard both O-rings from the des-
iccant cartridge bolt.
6. Using a clean rag, wipe the inside of the end
cover clean. Clean the cartridge bolt bore in the
end cover and the sealing surfaces for the large
and small diameter desiccant cartridge sealing
rings.
7. Inspect the end cover for physical damage, then
inspect all air line fittings for corrosion, and re-
place as necessary.
8. Inspect the bolt, paying attention to the threads
and O-ring grooves. Clean the bolt.
IMPORTANT: Use only the grease supplied with
Bendix replacement kits.
9. Lubricate the O-rings, bolt O-ring grooves, the
sealing rings, and the cartridge grooves. Lubri-
cate the end cover bore for the bolt.
10. Install both O-rings on the cartridge bolt and,
using a twisting motion, insert the assembled
desiccant cartridge bolt in the end cover.
11. Install the desiccant cartridge on the end cover,
making sure that the cartridge is properly seated
and flush on the end cover.
NOTE: It may be necessary to rotate the car-
tridge slightly until the anti-rotation lugs are
properly aligned and allow the cartridge to rest
flush against the end cover.
12. Using a wrench or socket, tighten the desiccant
cartridge bolt to 70 lbf·ft (95 N·m). Do not over-
torque.
13. Before placing the vehicle into service, perform
the testing listed below.
13.1 Close all reservoir drain cocks.
13.2 Build the system pressure to governor
cutout and note that the AD-IP air dryer
purges with an audible escape of air.
13.3 Fan the service brakes to reduce system
air pressure to governor cut-in. Note that
the system once again builds to full pres-
sure and is followed by a purge at the
AD-IP air dryer exhaust.
13.4 Check for excessive leakage around the
head of the desiccant cartridge where it
contacts the end cover. With the com-
pressor in loaded mode (compressing
air), apply a soapy solution to these areas
and observe that any leakage does not
exceed a one-inch bubble in one second.
If leakage exceeds this measure, remove
and re-install the desiccant cartridge.
42–02 Governor D–2A
Checking
IMPORTANT: Review the warranty policy before
performing any intrusive maintenance proce-
dures. An extended warranty may be voided if
intrusive maintenance is performed during this
period.
Every 12 months perform the operational tests as
listed below.
f420544a
1 & 9
2
3
4
5
6
7
8
09/20/94
Fig. 2, End Cover to Housing Torque Pattern
Brakes
42
Saf-T-Liner C2 School Bus Maintenance Manual, November 2020
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