Excelsior-HENDERSON HCX 1999, Service Handbook

Page: 309 / 474

9. PRIMARY DRIVE
6999-0003 7/15/99
9-1
SERVICE INFORMATION
GENERAL
The primary drive transfers power from the engine, through the torsional compensator, and into the clutch and
transmission. The outer primary cover, torsional compensator, and inner primary cover are the main components of
the primary drive. The torsional compensator uses a combination of ramps and springs to smooth the shock of
engine combustion pulses before they reach the clutch and transmission. The primary drive ratio is 1.75:1.
For design efficiency reasons, parts of other systems are on and around the primary drive. Starter drive and
alternator components mount to the crankshaft on each end of the torsional compensator. The alternator stator and
the clutch slave cylinder are held in position by the outer primary cover. The clutch and transmission input shaft also
reside between the primary drive covers.
• For additional Starter service information (see Chapter 17. STARTER) .
• For additional Alternator service information (see Chapter 16. BATTERY/CHARGING SYSTEM) .
• For additional Clutch service information (see Chapter 10. CLUTCH) .
Caution
Cleanliness is essential when servicing hydraulic clutch components. Always ensure hands, tools, and work
surfaces are clean to avoid contamination.
• For Transmission service information (see Chapter 11. TRANSMISSION) .
TORQUE VALUES
Outer primary cover insert screw . . . . . . . . . . . . 8 ft-lbs
Outer primary cover screw . . . . . . . . . . . . . . . . . 8 ft-lbs
Clutch hose banjo bolt . . . . . . . . . . . . . . . . . . . 18 ft-lbs
Clutch cover screw . . . . . . . . . . . . . . . . . . . . . . . 8 ft-lbs
Torsional compensator spring retainer . . . . . . .
80 ft-lbs
Inner primary cover screw. . . . . . . . . . . . . . . . . . 8 ft-lbs
TOOLS
Torsional compensator socket . . . . . . . . EH-6999-0041
TROUBLESHOOTING
Excessive noise
• Worn or damaged compensator springs
• Worn compensator splines
• Worn, damaged, or missing gear teeth
• Worn compensator ramp faces
SERVICE INFORMATION . . . . . . . . . . 9-1
TROUBLESHOOTING . . . . . . . . . . . . . 9-1
OUTER PRIMARY COVER . . . . . . . . . 9-2
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . 9-2
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . 9-2
INSPECTION . . . . . . . . . . . . . . . . . . . . . . 9-3
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . 9-3
INSTALLATION . . . . . . . . . . . . . . . . . . . . 9-3
TORSIONAL COMPENSATOR . . . . . . .9-4
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . 9-4
INSPECTION . . . . . . . . . . . . . . . . . . . . . . 9-5
INSTALLATION . . . . . . . . . . . . . . . . . . . . 9-6
INNER PRIMARY COVER . . . . . . . . . . .9-6
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . 9-6
INSPECTION . . . . . . . . . . . . . . . . . . . . . . 9-7
INSTALLATION . . . . . . . . . . . . . . . . . . . . 9-7