8.
With the air system charged to 120 psi (827
kPa), and with the fan solenoid connector halves
separated, check the fan clutch for audible air
leaks, using a suitable listening device.
9.
If a leak is detected, remove the fan blade. Using
a soapy water solution, check the fan clutch at
the following locations to locate the source of the
leak. Install a new seal kit. See
Group 20
of the
Century Class Trucks Workshop Manual
for re-
pair procedures.
9.1
Check for a leak at the bleed hole on the
fan pilot. Air leakage means that the car-
tridge assembly (
, Ref. 16) or face
seal (Ref. 17) is damaged.
9.2
Check for air leaks between the air cham-
ber and the piston friction disc. Air leak-
age means that the large O-ring (Ref. 14)
is damaged.
9.3
Check for air leaks around the safeguard
hole on the piston friction disc. Air leak-
age means the small O-ring (Ref. 18) is
damaged.
9.4
Check for air leaking from the System
Sentry® fuse. Leaking air means the
clutch has gotten so hot the lead alloy in
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 the fan clutch operation as follows:
f200194a
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
23
22
24
03/30/95
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
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
17. Face Seal
18. Small O-Ring
19. Air Chamber
20. Socket-Head Capscrew
21. Stud Bolt
22. Lockwasher
23. Hexnut
24. Piston Assembly
Fig. 8, Horton Advantage Fan Clutch Components
Engine Cooling/Radiator
20
Century Class Trucks Maintenance Manual, January 2016
20/6
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