Clutch Installation and
Maintenance
15.5 Easy Pedal and Heavy Duty Solo
Clutch Basics
Provide means to disengage engine
Provide torsional vibration protection
Three factors that determine Clutch
capacity
1) Friction material
2) Surface area
3) Clamp load
Cover Assemblies
ntains Pressure Plate
ermines plate load
ustable or Non-adjustable
ease bearing
es not affect torsionals
Easy-Pedal Plus® 14” and 15.5”
Heavy-Duty Solo™
Driven Discs “Dampers”
rsional damper “Soft Rate”
umber of springs
7-Spring
umber of facings
V.C.T. ™
Clutch Brakes
1-3/4 and 2.00”
Single piece “Torque Limiting”
Two piece - non torque limiting
How They Work Together
How They Work Together
What Wears and Why Adjust for
It?
When to Replace the Clutch
Eaton clutches should be replaced
when internal adjustment can not
correct for a loss of free-pedal or can
not compensate for a slipping clutch
NOT: When you think it may slip soon
When you think you have adjusted it
too much
When you think the lock strap wont
Easy-Pedal Plus - 15.5”
®
Industry standard clutch
Large application range
1050 to 2050 Lb-Ft
– 8-Spring
– 7-Spring
– 9-Spring
– 10-Spring
– V.C.T.™
Clutch adjustment
15 1/2” Two Plate Angle spring/Easy Pedal Plus
• Using the internal
adjustment of the
clutch Set the bearing
to clutch brake
clearance, 1/2 to
9/16”.
Clutch adjustment
•Check/set the clearance
between the yoke tips and
the bearing wear pads for
a minimum 1/8”
clearance, the truck
linkage is used to increase
or decrease the clearance.
Clutch adjustment
•Insert a .010” feeler
gauge between the
bearing and the brake,
depress clutch pedal
to the end of it’s
stroke to verify clutch
brake squeeze.
Clutch adjustment
•The clutch brake will
be squeezed if the total
pedal stroke exceeds the
1/8” and the 1/2”
settings.
•If not you will need to
gain more linkage
movement.
Clutch adjustment
If the brake is not being squeezed, do not
change the 1/2” and 1/8” settings.
•Check linkage for worn components.
•Verify linkage is reassembled in correct
hole locations.
•Increase pedal stroke (raising upper and
lowering lower pedal stops).
Clutch adjustment
•Measure and record the
free pedal in the cab-this
is the normal free pedal
for this truck (never use
the in-cab free pedal to set
up the clutch).
Clutch Lubrication
•In order to properly lubricate the
release bearing bushings, grease
must purge from the rear of the
release bearing.
Spicer Solo Product Family
15.5” HD Eaton
Spicer Solo
14” MD Eaton
Spicer Solo
Spicer Solo Heavy-Duty
Spicer Solo Medium-Duty
How It Works
Cam Spring
Release Bearing
Bracket
Cams
Shipping
Bolt
Plate
Spacer
Pressure Plate
How It Works
Plate Spacer
Cams
Controlled Gap
Pressure Plate
Wear Indicator
How a MD Solo Works
Front Driven Disc
Pressure Plate
Engine Flywheel
Retainer
Rear Driven Disc
Release Bearing
Intermediate Plate
Pressure Spring
Adjusting ring
Clutch Failure analysis
Yoke Bridge Rubbing into Cover
•Worn or missing clutch brake.
•Excessive wear on release bearing pads.
•Improper setup of linkage system.
This Clutch was Properly
Adjusted Internally
•By using the adjusting ring, because each of the 6 levers has more
than one witness mark (or lever fulcrum point).
Bent/Broken Kwik-Adjust
Mechanism
•From not releasing the load from the pressure plate before
making an adjustment.
Release Bearing Assembly
Broke Away from Release
Sleeve
•Due to lack of periodic lubrication.
•Failure to fully release or ride clutch pedal.
Oil Soaked Ceramic Disc
•Leaking transmission and or leaking rear main engine seal.
Broken Drive Pin
•Missaplication of the clutch.
•Unequal loading of the drive pins.
Non-Eaton Spicer Material
Input Shaft (drive gear) Spline
Wear
•Engine torsionals/vibration.
Rear Disc Interfering with the
Retainer Assembly
•Adjusting the clutch externally with the linkage.
Keystone Wear Pattern
•Normal wear pattern.
Grease on Buttons of Ceramic
Discs
•Failure to remove rust preventative from the flywheel.
•Greasing the splined areas of either the input shaft or
disk.
Cracked Dampener Cover
•Allowing the transmission to hang unsupported in the
driven disk during installation.
•Misalignment between engine and transmission.