Freightliner Columbia. Manual - part 10

If the fan clutch does not operate correctly, see
Group 20 of the Columbia® Workshop Manual
for troubleshooting and repair procedures.

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

Fig. 8

Using a wet finger or a soapy water solution,
check for a leak in the same areas.

If a leak is detected, remove the fan blade. In-
stall a new seal kit. See Group 20 of the
Columbia® Workshop Manual for repair proce-
dures.

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.

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 Columbia® Workshop
Manual.

f200581

05/30/2002

Fig. 8, Checking for Air Leaks (Horton DriveMaster)

Engine Cooling/Radiator

20/7

Title of Maintenance Operation (MOP)

MOP Number

Clutch Release Cross-Shaft Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–02

Eaton Fuller Clutch Release Bearing Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–01

Meritor Clutch Release Bearing Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–04

Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Sleeve Assembly Bronze Bushing Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–03

Clutch

Index, Alphabetical

Safety Precautions

DANGER

When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.

25–01 Eaton Fuller Clutch

Release Bearing
Lubrication

The standard clutch release bearing is not sealed,
and requires lubrication. If the vehicle is not
equipped with an optional sealed clutch release bear-
ing, lubricate the bearing as follows:

Park the vehicle on a level surface. Apply the
parking brakes, and chock the rear tires.

Remove the clutch inspection plate.

NOTE: Some clutch release bearings are
equipped with a lubrication extension that ex-
tends outside of the clutch housing. It is not
necessary to remove the clutch inspection plate
when the lubrication extension is used.

NOTE: For lubrication of the release bearing,
Eaton Fuller recommends a lithium-base high-
temperature grease that meets the NLGI grade
one or two specification.

Wipe any dirt away from the grease fitting. See

Fig. 1

. Using a pressure-type grease gun

equipped with the recommended grease, lubri-
cate the bearing until excess grease purges from
the rear of the release bearing (toward the
transmission).

CAUTION

Do not over-lubricate the clutch release bearing.
Over-lubrication could contaminate the clutch in-
ternally, causing clutch slippage and premature
failure. Do not use chassis grease or multipurpose
lubricants.

Wipe off excess grease and apply to both the
yoke finger and sleeve bushing contact points.
See

Fig. 2

Install the clutch inspection plate, then remove
the chocks.

f250081a

05/27/93

Fig. 1, Release Bearing Grease Fitting

08/10/2009

f250444

Sleeve Bushing Contact Point

Yoke Finger Contact Points

Fig. 2, Grease the Contact Points

Clutch

25/1

25–02 Clutch Release Cross-

Shaft Lubrication

The clutch release cross-shaft is equipped with two
grease fittings in the transmission clutch housing.
See

Fig. 3

and

Fig. 4

. Wipe any dirt from the grease

fittings, and lubricate with multipurpose chassis
grease.

25–03 Sleeve Assembly Bronze

Bushing Lubrication

Vehicles equipped with the sealed clutch release
bearing require lubrication of the bronze bushing lo-
cated between the clutch bearing housing and the
transmission input shaft. Use a pressure-type grease
gun equipped with high-temperature grease only, and
lubricate until grease flows from the release bearing
housing. Depress the clutch pedal a couple of times
before starting the engine.

25–04 Meritor Clutch Release

Bearing Lubrication

The standard clutch release bearing is not sealed,
and requires lubrication. If the vehicle is not
equipped with an optional sealed clutch release bear-
ing with a grease fitting, lubricate the bearing as
follows:

Park the vehicle on a level surface. Apply the
parking brakes, and chock the rear tires.

Remove the clutch inspection plate.

NOTE: For lubrication of the release bearing,
Meritor recommends a lithium-base high-
temperature grease that meets the NLGI grade
three specification.

Wipe any dirt from the grease fitting. See

Fig. 1

Using a pressure-type grease gun equipped with
recommended grease, lubricate the bearing until
excess grease purges from the rear of the re-
lease bearing (toward the transmission).

CAUTION

f250048a

10/19/93

Clutch Release Cross-Shaft

Grease Fitting

Fig. 3, Cross-Shaft Grease Fitting, Left-Side

f260146a

05/27/93

Fig. 4, Cross-Shaft Grease Fitting, Right-Side

Clutch

25/2

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