Freightliner Business Class M2. Manual - part 9

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.

Inspect the electrical connections and wires to
the fan clutch solenoid. Secure the connection if
loose; replace wires and connectors if damaged.

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 assembly, and install it on the ve-
hicle.

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.

Check the fan belt for wear, tension, and align-
ment. Correct, if necessary.

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.

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® M2 Workshop
Manual for troubleshooting and repair proce-
dures.

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. 1

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
Business Class® M2 Workshop 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.

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® M2
Workshop Manual.

f200581

05/30/2002

Fig. 1, Checking for Air Leaks (Horton DriveMaster)

Engine Cooling/Radiator

Business Class M2 Maintenance Manual, August 2015

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20–04 Hybrid Electric System

Coolant Changing

Disconnect the 12-volt vehicle batteries to isolate
the high voltage power source.

Drain the hybrid radiator, as follows.

2.1

Place a large container under the hybrid
radiator.

2.2

Remove the cap from the coolant reser-
voir.

2.3

If equipped with a petcock, open it at the
bottom of the hybrid radiator to drain the
coolant.

2.4

Disconnect the lower radiator hose, and
drain the remaining coolant.

2.5

Close the petcock, if equipped.

Install the lower radiator hose.

Fill the system with a coolant mixture of 50 per-
cent ethylene glycol and 50 percent water.

Using ServiceRanger

, activate the HEV coolant

pump to purge any air that may be trapped in the
system. Run the cooling pump until the air
bubbles stop appearing in the reservoir tank.

Check the coolant level, and add coolant as
needed. The system should be filled to the mid
level of the reservoir.

1 ServiceRanger is a service and diagnostic software program available from
Eaton Corporation. See the Eaton website,

www.roadranger.com

for more

information.

Engine Cooling/Radiator

Business Class M2 Maintenance Manual, August 2015

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Title of Maintenance Operation (MOP)

MOP Number

Clutch Adjusting, Manually Adjusted Clutches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–05

Clutch Hydraulic Fluid Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–04

Clutch Hydraulic Fluid Level Checking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–03

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

Eaton Fuller Clutch Release Cross-Shaft Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–02

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–00

Clutch

Index, Alphabetical

Business Class M2 Maintenance Manual, August 2015

25–00 Safety Precautions

Safety Precautions in this section apply to all
procedures within this group.

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
Lubricating

The standard clutch release bearing is sealed, and
does not require lubrication. If the vehicle is not
equipped with a maintenance-free sealed clutch re-
lease bearing, 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 lubricating the release bearing,
Eaton Fuller recommends a lithium-base high-
temperature grease that meets the NLGI grade
one or two specification.

Wipe the dirt away from the grease fitting. See

Fig. 1

. Use a low-pressure-type grease gun

equipped with the recommended grease, and
lubricate 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 it to both the
yoke finger and sleeve bushing contact points.
See

Fig. 2

Install the clutch inspection plate.

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

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