Jeep XJ. Manual — part 388
AUTOMATIC TRANSMISSION—30RH
TABLE OF CONTENTS
page
page
DESCRIPTION AND OPERATION
30RH AUTOMATIC TRANSMISSION. . . . . . . . . . . 89
FLUID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
TORQUE CONVERTER . . . . . . . . . . . . . . . . . . . . 97
OIL PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
VALVE BODY . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
ACCUMULATOR . . . . . . . . . . . . . . . . . . . . . . . . . 117
PISTONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
FRONT CLUTCH . . . . . . . . . . . . . . . . . . . . . . . . 120
REAR CLUTCH . . . . . . . . . . . . . . . . . . . . . . . . . 121
OVERRUNNING CLUTCH . . . . . . . . . . . . . . . . . 122
PLANETARY GEARSET . . . . . . . . . . . . . . . . . . . 122
BANDS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
SERVOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
GOVERNOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
GEARSHIFT MECHANISM . . . . . . . . . . . . . . . . . 124
CONVERTER DRAINBACK VALVE . . . . . . . . . . . 125
BRAKE TRANSMISSION SHIFT INTERLOCK
MECHANISM. . . . . . . . . . . . . . . . . . . . . . . . . . 125
DIAGNOSIS AND TESTING
AUTOMATIC TRANSMISSION DIAGNOSIS. . . . . 126
EFFECTS OF INCORRECT FLUID LEVEL . . . . . 126
CAUSES OF BURNT FLUID . . . . . . . . . . . . . . . . 126
FLUID CONTAMINATION . . . . . . . . . . . . . . . . . . 127
PRELIMINARY DIAGNOSIS . . . . . . . . . . . . . . . . 128
PARK/NEUTRAL POSITION SWITCH . . . . . . . . . 128
GEARSHIFT CABLE . . . . . . . . . . . . . . . . . . . . . . 128
THROTTLE VALVE CABLE . . . . . . . . . . . . . . . . . 129
ROAD TESTING . . . . . . . . . . . . . . . . . . . . . . . . . 129
ANALYZING ROAD TEST . . . . . . . . . . . . . . . . . . 129
HYDRAULIC PRESSURE TEST . . . . . . . . . . . . . 129
AIR TESTING TRANSMISSION CLUTCH AND
BAND OPERATION . . . . . . . . . . . . . . . . . . . . . 131
DIAGNOSIS. . . . . . . . . . . . . . . . . . . . . . . . . . . 132
DIAGNOSIS CHARTS . . . . . . . . . . . . . . . . . . . . . 133
SERVICE PROCEDURES
FLUID LEVEL CHECK . . . . . . . . . . . . . . . . . . . . 141
FLUID AND FILTER REPLACEMENT . . . . . . . . . 141
TRANSMISSION FILL PROCEDURE. . . . . . . . . . 142
CONVERTER DRAINBACK CHECK VALVE
SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
OIL PUMP VOLUME CHECK . . . . . . . . . . . . . . . 142
FLUSHING COOLERS AND TUBES . . . . . . . . . . 143
ALUMINUM THREAD REPAIR . . . . . . . . . . . . . . 144
REMOVAL AND INSTALLATION
TRANSMISSION. . . . . . . . . . . . . . . . . . . . . . . . . 144
TORQUE CONVERTER . . . . . . . . . . . . . . . . . . . 146
YOKE SEAL REPLACEMENT . . . . . . . . . . . . . . . 147
EXTENSION HOUSING BUSHING . . . . . . . . . . . 147
ADAPTER HOUSING . . . . . . . . . . . . . . . . . . . . . 147
SPEEDOMETER ADAPTER . . . . . . . . . . . . . . . . 148
PARK/NEUTRAL POSITION SWITCH . . . . . . . . . 149
GEARSHIFT CABLE . . . . . . . . . . . . . . . . . . . . . . 150
BRAKE TRANSMISSION SHIFT INTERLOCK . . . 150
VALVE BODY . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
OUTPUT SHAFT REAR BEARING . . . . . . . . . . . 153
GOVERNOR AND PARK GEAR . . . . . . . . . . . . . 153
PARK LOCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
DISASSEMBLY AND ASSEMBLY
GOVERNOR AND PARK GEAR . . . . . . . . . . . . . 154
VALVE BODY . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
TRANSMISSION. . . . . . . . . . . . . . . . . . . . . . . . . 163
OVERRUNNING CLUTCH/LOW-REVERSE
DRUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
FRONT SERVO PISTON . . . . . . . . . . . . . . . . . . 176
REAR SERVO PISTON. . . . . . . . . . . . . . . . . . . . 177
OIL PUMP AND REACTION SHAFT SUPPORT. . 177
FRONT CLUTCH . . . . . . . . . . . . . . . . . . . . . . . . 180
REAR CLUTCH . . . . . . . . . . . . . . . . . . . . . . . . . 181
PLANETARY GEARTRAIN/OUTPUT SHAFT . . . . 185
CLEANING AND INSPECTION
GOVERNOR AND PARK GEAR . . . . . . . . . . . . . 191
EXTENSION HOUSING AND PARK LOCK . . . . . 191
VALVE BODY . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
TRANSMISSION. . . . . . . . . . . . . . . . . . . . . . . . . 194
OVERRUNNING CLUTCH/LOW-REVERSE
DRUM/OVERDRIVE PISTON RETAINER . . . . . 195
FRONT SERVO . . . . . . . . . . . . . . . . . . . . . . . . . 195
REAR SERVO . . . . . . . . . . . . . . . . . . . . . . . . . . 195
OIL PUMP AND REACTION SHAFT SUPPORT. . 195
FRONT CLUTCH . . . . . . . . . . . . . . . . . . . . . . . . 196
REAR CLUTCH . . . . . . . . . . . . . . . . . . . . . . . . . 196
PLANETARY GEARTRAIN/OUTPUT SHAFT . . . . 197
ADJUSTMENTS
GEARSHIFT CABLE . . . . . . . . . . . . . . . . . . . . . . 197
BRAKE TRANSMISSION SHIFT INTERLOCK
CABLE ADJUSTMENT . . . . . . . . . . . . . . . . . . . 198
TRANSMISSION THROTTLE VALVE CABLE
ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . 198
FRONT BAND ADJUSTMENT . . . . . . . . . . . . . . . 199
REAR BAND ADJUSTMENT . . . . . . . . . . . . . . . . 200
VALVE BODY . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
SCHEMATICS AND DIAGRAMS
HYDRAULIC SCHEMATICS . . . . . . . . . . . . . . . . 201
SPECIFICATIONS
30RH AUTOMATIC TRANSMISSION . . . . . . . . . . 212
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
SPECIAL TOOLS
30RH TRANSMISSIONS . . . . . . . . . . . . . . . . . . . 213
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AUTOMATIC TRANSMISSION—30RH
XJ
DESCRIPTION AND OPERATION
30RH AUTOMATIC TRANSMISSION
DESCRIPTION
The 30RH automatic transmission is used with the
2.5L engine (Fig. 1). The 30RH is three speed trans-
missions with a lock-up clutch in the torque con-
verter. The transmissions contain a front and rear
clutch which function as the input driving compo-
nents. They also contain the kickdown (front) and the
low/reverse (rear) bands which, along with the over-
running clutch, serve as the holding components. The
driving and holding components combine to select the
necessary planetary gear components, in the front
and rear planetary gear set, transfer the engine
power from the input shaft through to the output
shaft. The transmissions contain a governor that is
mounted on the output shaft and supplies pressure
to the valve body based on the output shaft speed.
The valve body is mounted to the lower side of the
transmission and contains the valves to control pres-
sure regulation, fluid flow control, and clutch/band
application. The oil pump is mounted at the front of
the transmission and is driven by the torque con-
verter hub. The pump supplies the oil pressure nec-
essary for clutch/band actuation and transmission
lubrication. The 30RH transmission is cooled by an
integral fluid cooler inside the radiator.
XJ
AUTOMATIC TRANSMISSION—30RH
21 - 89
Fig. 1 30RH Automatic Transmission
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AUTOMATIC TRANSMISSION—30RH
XJ
DESCRIPTION AND OPERATION (Continued)
TRANSMISSION IDENTIFICATION
Transmission identification numbers are stamped
on the left side of the case just above the oil pan gas-
ket surface (Fig. 2). Refer to this information when
ordering replacement parts.
TRANSMISSION GEAR RATIOS
Forward gear ratios are:
• 2.74:1 (first gear)
• 1.54:1 (second gear)
• 1.00:1 (third gear)
OPERATION
The application of each driving or holding compo-
nent is controlled by the valve body based upon the
manual lever position and governor pressure. The
governor pressure is a variable pressure input to the
valve body and is one of the signals that a shift is
necessary. First through third gear are obtained by
selectively
applying
and
releasing
the
different
clutches and bands. Engine power is thereby routed
to the various planetary gear assemblies which com-
bine with the overrunning clutch assembly to gener-
ate the different gear ratios. The torque converter
clutch is hydraulically applied and is released when
fluid is vented from the hydraulic circuit by the
torque converter control (TCC) solenoid on the valve
body. The torque converter clutch is controlled by the
Powertrain Control Module (PCM). The torque con-
verter clutch engages in third gear when the vehicle
is cruising on a level plane after the vehicle has
warmed up. The torque converter clutch will disen-
gage momentarily when an increase in engine load is
sensed by the PCM, such as when the vehicle begins
to go uphill or the throttle pressure is increased. The
torque converter clutch feature increases fuel econ-
omy and reduces the transmission fluid temperature.
Fig. 2 Transmission Part Number And Serial
Number Location
1 – PART NUMBER
2 – BUILD DATE
3 – SERIAL NUMBER
XJ
AUTOMATIC TRANSMISSION—30RH
21 - 91
DESCRIPTION AND OPERATION (Continued)
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