GMC T Series 1994 Repair Manual page 723

HYDRA-MATIC 4L80-E
CLUTCH PLATE APPLICATION CHART
DIRECT CLUTCH
NO. OF NO. OF
DISHED
FLAT STEEL
M O D ELS PLATES PLATES
2.32MM 1.37MM
THICKNESS
(.0915") (.054")
ALL MODELS 5
Figure 47 Direct Clutch Plate Chart
625 627
604 SEAL, CLUTCH (OUTER)
605 SEAL, CLUTCH (INNER)
607 SPRING AND RETAINER ASSEMBLY
608 RING, SNAP
609 PLATE, CLUTCH (.054 DISHED)
611 PLATE ASSEMBLY, CLUTCH
616 RING, SNAP (6.24 O.D. X .062)
617 PLATE, DIRECT CLUTCH BACKING
618 PLATE, CLUTCH (.0915 FLAT)
619 PISTON, DIRECT CLUTCH
622 SEAL, CLUTCH (CENTER)
623 HOUSING, DIRECT CLUTCH
624 SPRAG ASSEMBLY, INTERMEDIATE CLUTCH
625 RACE, INTERMEDIATE CLUTCH (OUTER)
626 RETAINER, INTERMEDIATE CLUTCH
627 RING, EXTERNAL LOCKING
Figure 48 Direct and Intermediate Sprag Clutch
Assembly
| ^ | Measure
F ig u re 4 9
1. Place direct clutch assembly (623) on center
support (640) for air check operation.
2. Place indicator onto piston (619).
3. Air applied to reverse passage will escape from
direct passage. This condition is normal. Apply
80 psi of air pressure to direct passage to actuate
piston and move clutch plates.
4. Piston travel should be 3.07 to 4.72 mm (0.121
to 0.186 inch).
5. Remove direct clutch assembly (623).
NO. OF PISTON
COMPOSITION TRAVEL
PLATES CHECK
2.03MM
(.080")
3.07-4.27MM
(0.121-0.186")
1 5
RH0143-4L80-E
624 626
RH
A DIRECT CLUTCH FLUID PASSAGE
B REVERSE CLUTCH FLUID PASSAGE
623 HOUSING, DIRECT CLUTCH
640 SUPPORT & RACE ASSEMBLY, CENTER
Figure 49 A ir Checking Direct Clutch
INTERMEDIATE CLUTCH ASSEMBLY AND
FRONT BAND
| y | Inspect
1. Clutch plates (631 and 632) for:
• Wear, pitting, flaking or cracks in lining.
• Discoloration, scoring or cracks.
2. Backing plate (630) for:
• Burrs and dirt.
3. Front band (628) for:
• Wear, pitting, flaking or cracks in lining.
FORWARD CLUTCH ASSEMBLY
Figures 50 through 57
Tools Required:
J 23327 Spring Compressor
J 21664 Adapter
J 38732 Seal Protector (outer)
J 21362 Seal Protector (inner)
J 8001 Dial Indicator Set
|<$»| Disassemble
Figures 50 and 51
1. Snap ring (616) and direct clutch driving hub
(615) from forward clutch housing (602).
2. Forward clutch hub (613).
3. Thrust washers (614 and 612).
4. Clutch plates (610 and 611).
5. Dished plate (609).
6. Snap ring (608), spring and retainer assembly
(607) using J 23327.
7. Piston (606), and seals (604 and 605).
8. Seal (603) from forward clutch housing (602).
45 4 80
RHo i - L -E