1994 JEEP CHEROKEE oil

CONVERTERÐPUMP SEALÐDRIVE PLATE SERVICE
Drive Plate
The drive plate can be replaced or removed for service
access after the transmission is out of the vehicle (Fig. 2).
CAUTION: On YJ models with a 2.5L engine and
30RH transmission, special bolts are used to attach
the driveplate to the crankshaft. These bolts have a
smaller hex head for torque converter clearance.
DO NOT interchange these bolts with similar size
bolts for any reason.
Torque Converter
The torque converter can be replaced or removed
for service access after the transmission has been re-
moved (Fig. 2).
The torque converter is not a serviceable part. If
the converter is contaminated or damaged in any
way, it must be replaced as an assembly.Do not at-
tempt to flush a converter contaminated by
metal or clutch facing particles. Flushing will
not remove these contaminants.
A new torque converter and oil pump are used in
30RH/32RH transmissions built after the 1993
model year. The new converter has a different
style drive hub. The hub was changed to accept
the new design drive flats on the oil pump inner
gear. The drive flats replace the square lugs used
previously. If converter replacement should be-
come necessary, be sure to use the new style con-
verter. The new converter and oil pump are not
interchangeable with previous style parts.The oil pump seal is accessible and can be replaced af-
ter the transmission and torque converter are removed.
Use Remover Tool C-3981B to remove the seal
(Fig. 3). To use the tool, first start the tool into the
seal by hand. Next, thread the tool into the seal as
far as it will go. Use a wrench on the tool hex to turn
the tool. Continue tightening until all the tool
threads firmly grip the metal part of the seal. Then
tighten the tool puller screw to withdraw the seal
from the pump body.
Use Installer Tool C-4193 to install and seat the
seal (Fig. 4).
Be sure to lubricate the pump seal and converter
hub with transmission fluid before installation.
TRANSMISSION AND CONVERTER INSTALLATION
CAUTION: The transmission oil cooler and lines
must be reverse flushed if repair corrected a prob-
lem that generated sludge and/or debris. Sludge
and metal or friction particles from a gear or clutch
pack failure must be removed before reinstalling
the transmission. This is necessary to avoid re-con-
taminating the repaired transmission. Failure to re-
move sludge or debris from the cooler and lines
will result in a repeat failure and shop comeback.
Fig. 2 Typical Converter And Drive Plate
Fig. 3 Pump Seal Removal
Fig. 4 Pump Seal Installation
J30RH/32RH TRANSMISSION REMOVAL AND INSTALLATION 21 - 109

30RH/32RH TRANSMISSION OVERHAUL
INDEX
page page
Adapter Housing and Park Lock Component
Overhaul............................ 120
Front Clutch Overhaul.................... 125
Front Servo and Band Overhaul............ 136
Governor and Park Gear Overhaul.......... 121
Oil Pump Overhaul...................... 122
Overhaul Service Information............... 118
Overrunning ClutchÐLow-Reverse DrumÐRear
Support Overhaul...................... 118
Planetary Gear Train Overhaul............. 131Rear Clutch Overhaul.................... 128
Rear Servo and Band Overhaul............. 136
Transmission Assembly and Adjustment
Procedures........................... 146
Transmission Assembly Tips............... 146
Transmission Case Cleaning and Inspection . . . 118
Transmission Disassembly................. 112
Valve Body Assembly and Adjustment........ 144
Valve Body Disassembly and Inspection...... 138
TRANSMISSION DISASSEMBLY
(1) Clean transmission exterior with steam gun or
with solvent. Wear eye protection during cleaning
process.
(2) Remove throttle and shift levers from valve
body manual shaft and throttle lever shaft.
(3) Mount transmission in repair stand C-3750-B
(Fig. 1).
(4) Remove nuts attaching adapter, or extension
housing to transmission case.
(5) Remove adapter/extension housing and gasket
(Fig. 2).
(6) Remove rear bearing and snap ring, if
equipped.
(7) Remove park/neutral position switch and seal
(Fig. 3).
Fig. 1 Transmission Mounted On Typical Repair
Stand
Fig. 2 Adapter Housing Removal/Installation (4 x 4
Models)
Fig. 3 Park/Neutral Position Switch Removal/
Installation
21 - 112 30RH/32RH TRANSMISSION OVERHAULJ

(8) Remove oil pan bolts and remove pan and gas-
ket (Fig. 4).
(9) Remove hex head valve body attaching bolts
(Fig. 5).
(10) Disconnect solenoid wire from case connector
(Fig. 6).
(11) Lift valve body upward, guide park rod out of
case opening and remove valve body (Fig. 7).
(12) Remove accumulator spring and piston (Fig.
8).(13) Remove front band pivot pin access plug (Fig.
9). Plug is accessible through converter housing. Use
1/4 inch drive extension to remove plug as shown.
(14) Loosen front band adjusting screw locknut 4-5
turns. Then tighten band adjusting screw until band
is tight around front clutch retainer. This prevents
front/rear clutches from coming out with pump and
possibly damaging clutch or pump components.
Fig. 4 Oil Pan Removal/Installation
Fig. 5 Valve Body Attaching Bolt Locations (Typical)
Fig. 6 Solenoid Wire Connection
Fig. 7 Valve Body Removal/Installation
Fig. 8 Removing/Installing Accumulator Piston And
Spring
Fig. 9 Removing/Installing Front Band Pivot Pin
Access Plug
J30RH/32RH TRANSMISSION OVERHAUL 21 - 113

(15) Remove oil pump bolts.
(16) Thread bolts of Slide Hammer Tools C-3752
into threaded holes in pump body flange (Fig. 10).
(17) Bump slide hammer weights outward to re-
move pump and reaction shaft support assembly from
case (Fig. 10).
(18) Loosen front band adjusting screw until band
is completely loose.
(19) Squeeze front band together and remove band
strut (Fig. 11).
(20) Remove front band reaction pin with pencil
magnet. Pin is accessible from converter housing side
of case (Fig. 12).
(21) Remove front band lever (Fig. 13)
(22) Slide front band rearward and onto driving
shell. Band will not be removed until after front/rear
clutch removal.
(23) Remove front and rear clutch units as assem-
bly. Grasp input shaft, hold clutch units together and
remove them from case (Fig. 14).(24) Lift front clutch off rear clutch (Fig. 15). Set
clutch units aside for disassembly, cleaning and over-
haul.
Fig. 10 Removing Oil Pump/Reaction Shaft Support
Fig. 11 Removing/Installing Front Band Strut
Fig. 12 Removing Front Band Reaction Pin
Fig. 13 Removing/Installing Front Band Lever
Fig. 14 Removing Front/Rear Clutch Assemblies
21 - 114 30RH/32RH TRANSMISSION OVERHAULJ

OVERHAUL SERVICE INFORMATION
Inspect the transmission bushings during overhaul.
Bushing condition is important as severely worn, or
scored bushings contribute to low pressures, clutch
slip and accelerated wear of other components.How-
ever, do not replace bushings as a matter of
course. Replace bushings only when they are
actually worn, or scored.
Use recommended tools to replace bushings. The
tools are sized and designed to remove, install and
seat bushings correctly. The bushing replacement
tools are included in Bushing Tool Set C-3887-B. The
tool set is manufactured by Miller Tool Co. and is
available through the dealer tool program.
Pre-sized service bushings are available for replace-
ment purposes. Only the sun gear bushings are not
serviced. Low cost of the sun gear assembly makes it
easier to simply replace the gear and bushings as an
assembly.
Heli-Coil inserts are recommended for repairing
damaged, stripped or worn threads in aluminum
parts. These inserts are available from most automo-
tive jobbers. Stainless steel inserts are preferred.
The use of crocus cloth is permissible where neces-
sary. When used on valves, use care to avoid round-
ing off sharp edges. Sharp edges are vital as they
prevent foreign matter from getting between the
valve and valve bore.
Do not reuse oil seals, gaskets, seal rings, or O-
rings during overhaul. Replace these parts as a mat-
ter of course. Also do not reuse snap rings or E-clips
that are bent or distorted. Replace these parts as
well.
Lubricate transmission parts with Mopar ATF
Plus, Type 7176 transmission fluid during overhaul
and assembly.Use petroleum jelly to hold parts like thrust wash-
ers in place during assembly. Use Ru-Glyde, Door
Eze, or similar products to lubricate piston seals and
O-rings to ease installation. Petroleum jelly can also
be used to prelubricate parts during reassembly if de-
sired.
TRANSMISSION CASE CLEANING AND
INSPECTION
Clean the case in a solvent tank. Flush the case
bores and fluid passages thoroughly with solvent.
Dry the case and all fluid passages with compressed
air. Be sure all solvent is removed from the case and
that all fluid passages are clear.
Do not use shop towels or rags to dry the case
(or any other transmission component) unless
they are made from lint-free materials. Lint will
readily adhere to case surfaces and transmission
components and will circulate throughout the
transmission after assembly. A sufficient quan-
tity of lint can block fluid passages and interfere
with valve body operation.
Inspect the case for cracks, porous spots, worn
bores, or damaged threads. Damaged threads can be
repaired with Helicoil thread inserts. However, the
case will have to be replaced if it exhibits any type of
damage or wear.
Lubricate the front band adjusting screw threads
with petroleum jelly and thread the screw part-way
into the case. Be sure the screw turns freely.
Remount the case in a repair stand after cleaning
and inspection.
OVERRUNNING CLUTCHÐLOW-REVERSE
DRUMÐREAR SUPPORT OVERHAUL
DISASSEMBLING OVERRUNNING CLUTCH/
LOW-REVERSE DRUM
If the clutch assembly came out with the low-re-
verse drum, thread two clutch cam bolts into the
cam. Then lift the cam out of the drum with the bolts
(Fig. 30). Rotate the cam back and forth to ease re-
moval if necessary. Remove the clutch roller and
spring assembly from the race afterward.
CLEANING AND INSPECTION
Clean the overrunning clutch assembly, clutch
cam, low-reverse drum and rear support in solvent.
Dry them with compressed air after cleaning.
Inspect condition of each clutch part after cleaning.
Replace the overrunning clutch roller and spring as-
sembly if any rollers or springs are worn or dam-
aged, or if the roller cage is distorted, or damaged.
Replace the cam if worn, cracked or damaged.
Replace the low-reverse drum if the clutch race,
roller surface or inside diameter is scored, worn or
damaged.Do not remove the clutch race from the
Fig. 29 Compressing Rear Servo Spring
21 - 118 30RH/32RH TRANSMISSION OVERHAULJ

GOVERNOR AND PARK GEAR OVERHAUL
GOVERNOR/PARK GEAR DISASSEMBLY
(1) Loosen bolts attaching governor to park gear.
(2) Remove governor snap ring and locating snap
ring from output shaft (Fig. 39).
(3) Remove E-clip securing governor valve shaft
and remove shaft and valve from governor body.
(4) Slide governor and park gear off output shaft.
(5) Remove governor retaining bolts and separate
governor from park gear.
(6) Remove governor filter from park gear. Keep
filter with governor body.
(7) Remove governor weight snap ring and remove
weight assembly from governor body. Remove inner
snap ring and separate governor weights.
GOVERNOR/PARK GEAR CLEANING AND
INSPECTION
Clean the governor and park gear components in
solvent and dry with compressed air.
Examine the governor components carefully (Fig.
39). Discard any snap rings or E-clips if distorted, or
worn. Be sure the governor weights operate freely in
the bores and do not bind. Also verify that the gov-
ernor valve slides freely on the shaft and in the bore.
Minor scratches, or burrs on governor components
can be cleaned up with oil-soaked crocus cloth. How-
ever, do not attempt to salvage components that are
severely worn or scored.
The governor valve used in 30RH/32RH trans-
missions built starting with the 1992 model year,
is now made of aluminum. In addition, the out-
put shaft has been spotfaced to accept the newaluminum valve (Fig. 39). The aluminum valve
must not be used in prior transmissions. The
valve can only be used with an output shaft that
has been spotfaced for valve end clearance. In
addition, the governor body and output shaft
must be properly indexed during reassembly. Be
sure to index these components as described in
the Transmission Assembly and Adjustment pro-
cedures.
Check condition of the park gear seal rings, ring
grooves and gear teeth (Fig. 40). Replace the gear as
an assembly if the teeth or ring grooves are worn, or
damaged.
Replace the park gear front and rear seal rings if
cracked, or worn. The production style front ring is a
plain type and the rear ring is a hook style. If re-
placement rings are both hook-style, be sure the ring
ends are properly hooked together.ASSEMBLING GOVERNOR AND PARK GEAR
(1) Coat governor body bores and valves with
transmission fluid.
(2) Assemble governor weights and springs. Then
install weight assembly in governor body but do not
install valve and shaft at this time. These parts are
not installed until after governor and park gear are
in place on output shaft.
(3) Install new seal rings on park gear if neces-
sary.
(4) Insert filter screen in park gear and position
governor body on park gear.
Fig. 38 Correct Position Of Sprag And Spring
Fig. 39 Governor Components
J30RH/32RH TRANSMISSION OVERHAUL 21 - 121

(5) Tighten governor body attaching bolts finger
tight only. Bolts will not be final tightened until af-
ter governor and park gear are mounted on output
shaft.
OIL PUMP OVERHAUL
PUMP AND REACTION SHAFT SUPPORT
DISASSEMBLY
(1) Remove seal ring from housing and reaction
shaft support (Fig. 41).
(2) Mark pump housing and support assembly for
alignment reference.
(3) Loosen bolts that attach pump body to support
(Fig. 42).(4) Remove pump-to-support bolts and separate
support from pump housing (Fig. 43).
(5) Remove inner and outer gears from reaction
shaft support (Fig. 44).
(6) If pump seal was not removed during transmis-
sion disassembly, remove seal with punch and ham-
mer.
(7) Remove front clutch thrust washer from sup-
port hub (Fig. 45).
OIL PUMP AND REACTION SHAFT SUPPORT
CLEANING AND INSPECTION
Clean pump and reaction shaft support components
with solvent and dry them with compressed air.
Fig. 40 Park Gear And Seal Rings
Fig. 41 Removing Pump Seal Ring
Fig. 42 Loosening Pump Support Bolts
Fig. 43 Separating Pump Housing From Reaction
Shaft Support
Fig. 44 Pump Gear Removal
21 - 122 30RH/32RH TRANSMISSION OVERHAULJ

Inspect the pump housing and support components.
Replace the housing or support if the seal ring
grooves or machined surfaces are worn, scored, pit-
ted, or damaged.
Replace the pump gears if pitted, worn chipped, or
damaged. Inspect the thrust washer for wear or dam-
age. Replace the washer if necessary.Note that the
inner gear used in 1993 and later 30RH/32RH oil
pumps has a new design drive lug. The new de-
sign incorporates tapered drive flats instead of
the square lug used previously. The torque con-
verter hub has also been redesigned to accept
the new drive flats. If pump gear replacement is
necessary, be very sure to order and install the
correct style gears.
Inspect the pump and reaction shaft support bush-
ings. Minor bushing wear is acceptable. Replace the
bushings only if scored, or severely worn.
Install the gears in the pump housing and measure
end clearance with a feeler gauge and straightedge
(Fig. 46). Clearance should be 0.010 - 0.06 mm
(0.0004 - 0.0025 in.).
Measure clearance between the outer gear and the
pump body (Fig. 47). Clearance should be 0.08 - 0.19
mm (0.0035 - 0.0075 in.).
Measure gear tooth clearance with a feeler gauge.
Align one tooth of the outer gear in inner gear andmeasure clearance (Fig. 48). Clearance should be
0.08 - 0.19 mm (0.0035 - 0.0075 in.).
OIL PUMP BUSHING REPLACEMENT
(1) Remove pump bushing with Tool Handle
C-4171 and Bushing Remover SP-3551 (Fig. 49).
(2) Install new pump bushing with Tool Handle
C-4171 and Bushing Installer SP-5117 (Fig. 49).
Bushing should be flush with pump housing bore.
(3) Stake new pump bushing in two places with
blunt punch (Fig. 50). Remove burrs from stake
points with knife blade afterward.
REACTION SHAFT SUPPORT BUSHING
REPLACEMENT
(1) Assemble Bushing Remover Tools SP-1191,
Fig. 45 Oil Pump And Reaction Shaft Support Components (All)
Fig. 46 Measuring Pump Gear End Clearance
J30RH/32RH TRANSMISSION OVERHAUL 21 - 123