Jeep Grand Cherokee WK. Manual — part 1394
LOW/REVERSE CLUTCH
The Low/Reverse clutch is hydraulically applied in park, reverse, neutral, and first gear, only at low speeds, by pres-
surized fluid against the Low/Reverse clutch piston. When the Low/Reverse clutch is applied, the input annulus
assembly is held or grounded to the transmission case.
ASSEMBLY-INPUT CLUTCH
DESCRIPTION
Input Clutch Assembly - Part 1
1 - INPUT CLUTCH HUB
11 - UD CLUTCH
2 - O-RING SEALS
12 - PLATE
3 - SEAL
13 - CLUTCH RETAINER
4 - SNAP-RING
14 - SEAL
5 - SNAP-RING
15 - OD/REV PISTON
6 - UD BALANCE PISTON
16 - BELLEVILLE SPRING
7 - SNAP-RING
17 - SNAP-RING
8 - UD PISTON
18 - SEAL RINGS
9 - SPRING
19 - INPUT SHAFT
10 - DISC
20 - LUBRICATION CHECK VALVE AND SNAP-RING
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Three hydraulically applied input clutches are used to drive planetary components. The underdrive, overdrive, and
reverse clutches are considered input clutches and are contained within the input clutch assembly.
The input clutch assembly also contains:
•
Input shaft
•
Input hub
•
Clutch retainer
•
Underdrive piston
•
Overdrive/reverse piston
•
Overdrive hub
•
Underdrive hub
OPERATION
The three input clutches are responsible for driving different components of the planetary geartrain.
Input Clutch Assembly - Part 2
1 - THRUST BEARING NUMBER 3
10 - SNAP-RING (SELECT)
2 - OD HUB/SHAFT
11 - PLATE
3 - SNAP-RING (WAVE)
12 - DISC
4 - REV/OD REACTION PLATE
13 - OD CLUTCH
5 - THRUST BEARING NUMBER 4
14 - SNAP-RING (TAPERED)
6 - SNAP-RING (FLAT)
15 - UD/OD REACTION PLATE
7 - REVERSE HUB/SHAFT
16 - SNAP-RING (FLAT)
8 - REVERSE CLUTCH
17 - UD HUB/SHAFT
9 - REVERSE REACTION PLATE
18 - THRUST BEARING NUMBER 2
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UNDERDRIVE CLUTCH
The underdrive clutch is hydraulically applied in first, second, second prime, and third (direct) gears by pressurized
fluid against the underdrive piston. When the underdrive clutch is applied, the underdrive hub drives the input sun
gear.
OVERDRIVE CLUTCH
The overdrive clutch is hydraulically applied in third (direct), fourth, and fifth gears by pressurized fluid against the
overdrive/reverse piston. When the overdrive clutch is applied, the overdrive hub drives the reverse carrier/input
annulus assembly.
REVERSE CLUTCH
The reverse clutch is hydraulically applied in reverse gear by pressurized fluid against the overdrive/reverse piston.
When the reverse clutch is applied, the reaction annulus gear is driven.
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DISASSEMBLY
1. Remove the reverse reaction plate selective snap-ring (10) from the input clutch retainer (13).
2. Remove the reverse reaction plate (9) from the input clutch retainer (13).
3. Remove the reverse hub (7) and reverse clutch pack (8) from the input clutch retainer (13).
4. Remove the number 4 thrust bearing (5) from the overdrive hub (2).
5. Remove the overdrive hub (2) from the input clutch retainer (13).
6. Remove the number 3 thrust bearing (1) from the underdrive hub (17).
7. Remove the OD/reverse reaction plate snap-ring (6) from the input clutch retainer (13).
8. Remove the underdrive hub (17), overdrive clutch (13), and overdrive reaction plate (15) from the input clutch
retainer (13).
Input Clutch Assembly - Part 2
1 - THRUST BEARING NUMBER 3
10 - SNAP-RING (SELECT)
2 - OD HUB/SHAFT
11 - PLATE
3 - SNAP-RING (WAVE)
12 - DISC
4 - REV/OD REACTION PLATE
13 - OD CLUTCH
5 - THRUST BEARING NUMBER 4
14 - SNAP-RING (TAPERED)
6 - SNAP-RING (FLAT)
15 - UD/OD REACTION PLATE
7 - REVERSE HUB/SHAFT
16 - SNAP-RING (FLAT)
8 - REVERSE CLUTCH
17 - UD HUB/SHAFT
9 - REVERSE REACTION PLATE
18 - THRUST BEARING NUMBER 2
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