3.
Disconnect the line from the air inlet of the air
cylinder. Connect a shop air hose to the inlet.
4.
Apply a minimum of 100 psi (690 kPa) air pres-
sure to the air cylinder—the bearing housing will
move backwards, disengaging the clutch. Again,
measure the distance from the back surface of
the retaining plate to the forward-most edge of
the fan belt pulley.
5.
Compare the two measurements; if the difference
between the two measurements exceeds 0.150
inches (3.8 mm), the clutch lining is worn and
must be replaced. See
Group 20
of the
Columbia® Workshop Manual
for clutch lining
replacement instructions.
6.
Release the air pressure, then disconnect the
shop hose from the air inlet of the air cylinder.
Connect the vehicle air hose to the inlet.
7.
Connect the battery cables. 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
Columbia® Work-
shop 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 before
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.
3.4
Reassemble the clutch valve solenoid air
filter, then install it on the vehicle.
4.
Check the fan for bent, cracked, or damaged
blades. Replace if damaged. Check for adequate
clearance between the fan and other compo-
nents.
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 fan clutch from a distance.
Look for vibration, fan blade contact, fan clutch
slippage, and overall fan clutch operation.
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 Check
Engine Cooling/Radiator
20
Columbia Maintenance Manual, September 2015
20/6
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