freightliner COLUMBIA CL112 Maintenance Manual page 47

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1. Mounting Bracket
2. Rear Sheave Bearing
3. Inner and Outer Bearing
Spacers
4. Forward Sheave Bearing
5. Sheave
6. Friction Facing
7. Journal Spacer
8. Socket-Head Capscrew
the fuse melted. This released the clutch
before the heat could damage the clutch
bearings. Before replacing the fuse, find
and repair the source of the heat.
10. If equipped with an override toggle switch on the
dash, check fan clutch operation as follows:
10.1 Connect the halves of the fan solenoid
connector.
10.2 Turn off the air conditioner.
10.3 Start the engine and charge the air sys-
tem to 120 psi (827 kPa). Tests must be
performed with the engine temperature
below 205°F (96°C) for Caterpillar en-
gines, and below 200°F (93°C) for Cum-
mins and Detroit Diesel engines.
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4
3
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9. Rear Hub Bearing
10. Bearing Spacer
11. Splined Hub
12. Forward Hub Bearing
13. Piston Friction Disc
14. Large O-Ring
15. Locknut
16. Cartridge Assembly
Fig. 6, Horton Advantage Fan Clutch Components
Engine Cooling/Radiator
8
7
14
15
13
12
24
17. Face Seal
18. Small O-Ring
19. Air Chamber
20. Socket-Head Capscrew
21. Stud Bolt
22. Lockwasher
23. Hexnut
24. Piston Assembly
10.4 Set the toggle switch to ON; the fan
clutch should engage.
10.5 Apply the foot brake, and release the
parking brakes.
10.6 Set the toggle switch to AUTO or OFF; air
should exhaust and the fan clutch should
disengage. Replace the switch if neces-
sary.
11. If the fan stays engaged at all times on a Detroit
Diesel engine, check the circuit breaker labeled
"engine fan."
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Columbia Maintenance Manual, January 2007
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