Freightliner Business Class. Manual — part 13
8.
Start the engine.
Horton DriveMaster
®
Fan Clutch
NOTE: If any part of the fan clutch needs to be
repaired or replaced after performing the checks
below, see Group 20 of the
Business Class
®
Trucks Service Manual.
1.
Disconnect the batteries at the negative termi-
nals. Drain all air from the air system. If
equipped with an air starter, drain the air starter
reservoir.
WARNING
Make sure the batteries are disconnected, and if
applicable, the air starter reservoir is drained be-
fore checking the fan clutch. If the engine starts
during this procedure, the fan could engage,
which could result in serious personal injury.
2.
Inspect the electrical connections and wires to
the fan clutch solenoid. Secure the connection if
loose; replace wires and connectors if damaged.
3.
Clean the fan clutch air solenoid valve filter, if
equipped.
3.1
Unscrew the fan clutch solenoid valve air
filter assembly and remove the filter ele-
ment.
3.2
Clean the filter element with cleaning sol-
vent.
3.3
Using a clean, lint free cloth, wipe off any
excess solvent.
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. 6, Horton Advantage Fan Clutch Components
Engine Cooling/Radiator
20
Business Class Trucks Maintenance Manual, August 2003
20/6
3.4
Reassemble the clutch valve solenoid air
filter assembly and install on the vehicle.
4.
Visually check the fan for bent, cracked, or dam-
aged blades. Replace if damaged. Check for ad-
equate clearance between the fan and other
components.
5.
Check the fan belt for wear, tension, and align-
ment. Correct, if necessary.
6.
Check for wear on the friction facing. Replace
the friction facing if it is worn to a 3/16-inch (4.8-
mm) thickness or less. Also check the facing for
signs of oil contamination or burn marks. If evi-
dence of oil or burn marks are found, replace the
friction facing.
7.
Connect the battery cables. Start the engine, and
charge the air system to 120 psi (827 kPa).
Manually engage and disengage the fan clutch.
Check the fan and the fan clutch from a dis-
tance. Look for vibration, fan blade contact, fan
clutch slippage, and overall fan clutch operation.
If the fan clutch does not operate correctly, see
Group 20 of the
Business Class
®
Trucks Service
Manual
for troubleshooting and repair proce-
dures.
8.
With the air system charged to 120 psi (827
kPa), check the fan clutch for audible air leaks,
using a suitable listening device.
Check at the solenoid valve, the air filter assem-
bly, and the air hoses and fittings. See
Using a wet finger or a soapy water solution,
check for a leak in the same areas.
9.
If a leak is detected, remove the fan blade. In-
stall a new seal kit. See Group 20 of the
Busi-
ness Class
®
Trucks Service Manual
for repair
procedures.
10. Check the fan drive for discoloration or any other
signs of slipping or overheating.
NOTE: The fan clutch may slip if the air supply
pressure is below 70 psi (483 kPa) or if there is
a leak inside the fan clutch. Any leak must be
remedied.
11. Check the fan clutch bearings.
11.1
Turn the fan in both directions and feel
for worn hub bearings.
11.2
If possible, remove the drive belt and
check for worn sheave bearings by turn-
ing the sheave in both directions.
f200237a
1
2
3
4
5
6
05/27/93
A
With the fan clutch engaged, measure the distance at
A;
measure it again with the fan clutch disengaged.
1.
Bearing Housing
2.
Retaining Plate
3.
Fan Pulley
4.
Air Inlet (from solenoid
valve)
5.
Air Cylinder
6.
Fan
Fig. 7, Kysor K22RA Fan Clutch Lining Wear Checking
f200581
05/30/2002
Fig. 8, Checking for Air Leaks (Horton DriveMaster)
Engine Cooling/Radiator
20
Business Class Trucks Maintenance Manual, August 2003
20/7
11.3
If either the hub or sheave bearings are
worn, replace them, using a Horton Drive-
Master Super Kit.
For instructions and kit part number, see
Group 20 of the
Business Class
®
Trucks
Service Manual
.
Engine Cooling/Radiator
20
Business Class Trucks Maintenance Manual, August 2003
20/8
Title of Maintenance Operation (MOP)
MOP Number
Clutch (Pull-Type) Inspecting and Adjusting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–02
Clutch Release Bearing and Release Cross-Shaft Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–01
Hydraulic Fluid Level Checking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–03
Hydraulic Fluid Replacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–04
Clutch
25
Index, Alphabetical
Business Class Trucks Maintenance Manual, June 2002
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