Jeep Grand Cherokee WK. Manual — part 90
DIFFERENTIAL-ELSD
OPERATION
A gerotor pump (1) creates oil flow through the filter
(4) whenever left and right wheels spin at different
speeds and the solenoid valve is activated. The oil
flow is restricted by a Pressure Regulating Valve
(PRV) to build oil pressure. Pressurized oil is then fed
to a piston (2) chamber. The piston compresses the
clutch pack (3) providing additional torque to the lower
speed wheel.
When the antilock brakes are activated the differential
solenoid is switched off and pressure is bleed off the
clutch pack.
DIAGNOSIS AND TESTING
DIFFERENTIAL-ELSD
HYDRAULIC
CONDITION
POSSIBLE CAUSES
CORRECTION
No Lock Up
1. Pump Seals Leaking
1. Replace Differential
2. Clutch Worn
2. Replace Differential
3. Solenoid Valve
3. Replace Solenoid
4. Pluged Filter
4. Clean Filter
5. Final Drive Control Module
5. Replace Control Module
Raise vehicle and rotate tires in the opposite direction at the same time. This will make any oil left in the piston
chamber apply pressure to the clutch and create some drag on the wheels. The wheels will not lock because the
differntial solenoid is not activated.
SOLENOID
With solenoid disconnected resistance across the solenoid should be 13.5 to 14.5 ohms at 25°Celsius (77° Fahr-
enheit). To replace the solenoid diconnect wire connector then squeeze the retension clip and pull solenoid up.
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REAR AXLE - C213RE
WK
REMOVAL
1. Remove differential cover.
2. Remove axle shafts.
3. Remove ABS sensor from housing.
4. Remove solenoid valve connector (1) from ELSD
solenoid valve (2).
5. Mark differential housing and bearing caps (3) for
installation reference.
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REAR AXLE - C213RE
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6. Remove bearing adjuster lock bolt (3) from bearing
caps.
7. Loosen differential bearing cap bolts.
8. Loosen differential bearing adjusters through the
axle tubes (1) with Wrench C-4164 (3).
9. Hold differential case while removing bearing caps
and adjusters.
10. Remove differential case and tag differential bear-
ing cups and adjusters to indicate location.
11. Clean housing cavity with flushing oil, light engine
oil or a lint free cloth.
NOTE: Do not use steam, kerosene or gasoline to
clean the housing.
INSTALLATION
1. Apply a coat of hypoid gear lubricant to differential
bearings, bearing cups and threaded adjusters.
NOTE: Grease can be used to keep the adjusters
in position.
2. Install differential assembly into the housing.
3. Install differential bearing caps in their original loca-
tions.
4. Install bearing cap bolts and tighten upper bolts to
14 N·m (10 ft. lbs.). Tighten lower bolts finger-tight
until the bolt head is seated.
5. Perform differential bearing preload and adjustment
procedure.
6. Tighten bearing cap bolts (2) to 135 N·m (100 ft.
lbs).
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REAR AXLE - C213RE
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7. Install adjuster locks (3) on bearing caps and tighten bolts to 11 N·m (8 ft. lbs.).
8. Install axle shafts (1).
9. Install solenoid valve connector (1) to ELSD sole-
noid valve (2).
10. Install differential cover.
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REAR AXLE - C213RE
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