2. Clutch Installation and Maintenance
15.5 Easy Pedal and Heavy Duty Solo

3. 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

4. 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™

5. Driven Discs “Dampers”
Torsional damper “Soft Rate”
Number of springs
Number of facings
7-Spring
V.C.T. ™

6. Clutch Brakes 1-3/4 and 2.00” Single piece “Torque Limiting”
Two piece - non torque limiting

7. How They Work Together

8. How They Work Together

9. What Wears and Why Adjust for It?

10. 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

11. 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.™

12. 15 1/2” Two Plate Angle spring/Easy Pedal Plus
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”.

13. 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.

14. 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.

15. 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.

16. 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).

17. 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).

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

19. Spicer Solo Product Family
15.5” HD Eaton
Spicer Solo
14” MD Eaton
Spicer Solo

20. Spicer Solo Heavy-Duty

21. Spicer Solo Medium-Duty

22. How It Works Cam Spring Release Bearing Bracket Cams Shipping Bolt
Plate
Spacer
Pressure Plate

23. How It Works
Controlled Gap
Plate Spacer
Pressure Plate
Cams

24. Wear Indicator

25. How a MD Solo Works Front Driven Disc Pressure Plate Engine Flywheel
Retainer
Rear Driven Disc
Release Bearing
Intermediate Plate
Pressure Spring
Adjusting ring

26. Clutch Failure analysis

27. Yoke Bridge Rubbing into Cover
Worn or missing clutch brake.
Excessive wear on release bearing pads.
Improper setup of linkage system.

28. 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).

29. Bent/Broken Kwik-Adjust Mechanism
From not releasing the load from the pressure plate before making an adjustment.

30. Release Bearing Assembly Broke Away from Release Sleeve
Due to lack of periodic lubrication.
Failure to fully release or ride clutch pedal.

31. Oil Soaked Ceramic Disc
Leaking transmission and or leaking rear main engine seal.

32. Broken Drive Pin Missaplication of the clutch.
Unequal loading of the drive pins.

33. Non-Eaton Spicer Material

34. Input Shaft (drive gear) Spline Wear
Engine torsionals/vibration.

35. Rear Disc Interfering with the Retainer Assembly
Adjusting the clutch externally with the linkage.

36. Keystone Wear Pattern
Normal wear pattern.

37. 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.

38. Cracked Dampener Cover
Allowing the transmission to hang unsupported in the driven disk during installation.
Misalignment between engine and transmission.