ALLISON 1000 & 2000 PRODUCT FAMILIES
C2 CLUTCH PACK COMPONENTS
Inspect C2 drive hub interal, external and hub splines.
B. C2 Clutch Piston C. C2 Return Spring Assembly
H. C2 Clutch Balance Piston
Inspect P1 sun gear teeth and splines.
E. P1 Sun Gear G. C2 Drive Hub F. Thrust Washer A. C2 Clutch Pack D. P1 Drive Flange A. Inspect friction plate contact faces for excessive wear, embedded metal particles, cracking and distortion. Inspect the plate splines for burrs, cracks and damaged spline teeth. Replace the plate if spline damage cannot be repaired using a soft stone or crocus cloth. Minimum allowable friction plate thickness is 2.375 mm (0.0935 inch). Minimum allowable oil groove depth is 0.20 mm (0.008 inch). Maximum allowable coning is 0.225 mm (0.009 inch). NOTE: Anti-freeze (glycol) and/or
water will adversely affect the bonding agent between the friction material and steel core. Replace any friction plates which have been 46
ALLISON
TRANSMISSION
2005 General Motors Corporation.
exposed to water and/or glycol. Friction material which is loose or flaking indicates that the plates have been exposed to glycol and/or water. Reference SIL 18-TR-98, Rev. A for details.
any tangs are broken, bent or otherwise distorted. Minimum allowable plate thickness is 2.135 mm (0.0841 inch). Maximum allowable coning is 0.240 mm (0.0094 inch).
NOTE: Battered and worn spline
B. Inspect the C2 clutch piston for burrs, chips and cracks. Inspect the internal and external sealring grooves for burrs, chips and cracks. Replace the piston if damage cannot be repaired using a soft stone or crocus cloth.
teeth may be an indicator of driveline issues. Replace the clutch plates and check the driveline. Inspect reaction plate contact surfaces for chips, cracks, grooves, scoring and signs of discoloration. Inspect reaction plate tangs for chips, cracks and signs of battering. Replace the plate if damage cannot be repaired using a soft stone or crocus cloth. Replace the plate if TECHNICIANS’
GUIDE
C. Inspect the C2 clutch return spring plate for cracks, chips, burrs, bends and distortion. Replace the plate if damage cannot be repaired using a soft stone or crocus cloth. (continued)
