Clutch Installation and Maintenance

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Clutch Installation and Maintenance
15.5 Easy Pedal and Heavy Duty Solo
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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

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Cover Assemblies

• Contains Pressure Plate
• Determines plate load
• Adjustable or Non-adjustable
• Release bearing
• Does not affect torsionals

Easy-Pedal Plus 14 and 15.5
Heavy-Duty Solo
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Driven Discs Dampers

• Torsional damper Soft Rate
• Number of springs
• Number of facings

7-Spring
V.C.T.
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Clutch Brakes

• 1-3/4 and 2.00
• Single piece Torque Limiting
• Two piece - non torque limiting

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How They Work Together
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How They Work Together
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What Wears and Why Adjust for It?
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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 hold the ring

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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.

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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.

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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.

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Clutch adjustment

• Insert a .010 feeler gauge between the bearing
  and the brake, depress clutch pedal to the end of
  its stroke to verify clutch brake squeeze.

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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.

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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).

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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).

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Clutch Lubrication

• In order to properly lubricate the release
  bearing bushings, grease must purge from the rear
  of the release bearing.

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Spicer Solo Product Family
15.5 HD Eaton Spicer Solo
14 MD Eaton Spicer Solo
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Spicer Solo Heavy-Duty
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Spicer Solo Medium-Duty
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How It Works
Cam Spring
Release Bearing
Bracket
Cams
Shipping Bolt
Plate Spacer
Pressure Plate
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How It Works
Controlled Gap
Plate Spacer
Pressure Plate
Cams
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Wear Indicator
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How a MD Solo Works
Front Driven Disc
Pressure Plate
Engine Flywheel
Retainer
Rear Driven Disc
Release Bearing
Intermediate Plate
Pressure Spring
Adjusting ring
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Clutch Failure analysis
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Yoke Bridge Rubbing into Cover

• Worn or missing clutch brake.

• Excessive wear on release bearing pads.

• Improper setup of linkage system.

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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).

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Bent/Broken Kwik-Adjust Mechanism

• From not releasing the load from the pressure
  plate before making an adjustment.

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Release Bearing Assembly Broke Away from Release
Sleeve

• Due to lack of periodic lubrication.

• Failure to fully release or ride clutch pedal.

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Oil Soaked Ceramic Disc

• Leaking transmission and or leaking rear main
  engine seal.

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Broken Drive Pin

• Missaplication of the clutch.

• Unequal loading of the drive pins.

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Non-Eaton Spicer Material
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Input Shaft (drive gear) Spline Wear

• Engine torsionals/vibration.

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Rear Disc Interfering with the Retainer Assembly

• Adjusting the clutch externally with the linkage.

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Keystone Wear Pattern

• Normal wear pattern.

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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.

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Cracked Dampener Cover

• Allowing the transmission to hang unsupported in
  the driven disk during installation.

• Misalignment between engine and transmission.