Description And Operation; 186 Fbi Axle; Lubricant - Jeep cherokee 2000 Service Manual

XJ
DESCRIPTION AND OPERATION (Continued)
OPERATION
The axle receives power from the transfer case
through the front propeller shaft. The front propeller
shaft is connected to the pinion gear which rotates
the differential through the gear mesh with the ring
gear bolted to the differential case. The engine power
is transmitted to the axle shafts through the pinion
mate and side gears. The side gears are splined to
the axle shafts.

186 FBI AXLE

DESCRIPTION
The 186 Front Beam-design Iron (FBI) axle con-
sists of a cast iron differential housing with axle
shaft tubes extending from either side. The tubes are
pressed into the differential housing and welded.
The integral type housing, hypoid gear design has
the centerline of the pinion set below the centerline
of the ring gear.
The axle has a fitting for a vent hose used to
relieve internal pressure caused by lubricant vapor-
ization and internal expansion.
The axles are equipped with semi–floating axle
shafts, meaning that loads are supported by the hub
bearings. The axle shafts are retained by nuts at the
hub bearings. The hub bearings are bolted to the
steering knuckle at the outboard end of the axle tube
yoke. The hub bearings are serviced as an assembly.
For vehicles with ABS brakes, the ABS wheel
speed sensors are attached to the knuckle assem-
blies. The tone rings for the ABS system are pressed
onto the axle shaft. Do not damage ABS tone
wheel or the sensor when removing axle shafts.
The stamped steel cover provides a means for
inspection and servicing the differential.
The 186 FBI axle has the assembly part number
and gear ratio listed on a tag. The tag is attached to
the housing cover by a cover bolt. Build date identi-
fication codes are stamped on the cover side of the
axle shaft tube.
TUBE, 181, AND 186 FBI AXLE
The differential case is a one–piece design. The dif-
ferential pinion mate shaft is retained with a roll
pin. Differential bearing preload and ring gear back-
lash is adjusted by the use of shims (select thick-
ness). The shims are located between the differential
bearing cones and case. Pinion bearing preload is set
and maintained by the use of a collapsible spacer.
OPERATION
The axle receives power from the transfer case
through the front propeller shaft. The front propeller
shaft is connected to the pinion gear which rotates
the differential through the gear mesh with the ring
gear bolted to the differential case. The engine power
is transmitted to the axle shafts through the pinion
mate and side gears. The side gears are splined to
the axle shafts.

LUBRICANT

DESCRIPTION
A multi–purpose, hypoid gear lubricant which con-
forms to the following specifications should be used.
Mopar Hypoid Gear Lubricant conforms to all of
these specifications.
• The lubricant should have MIL–L–2105C and
API GL 5 quality specifications.
• Lubricant is a thermally stable SAE 80W–90
gear lubricant.
• Lubricant for axles intended for heavy-duty or
trailer tow use is SAE 75W–140 SYNTHETIC gear
lubricant.
The 181 FBI axle lubricant capacity is 1.2 L (2.5
pts.). The 186 FBI axle lubricant capacity is 1.18 L
(2.5 pts.).
CAUTION: If axle is submerged in water, lubricant
must be replaced immediately to avoid possible
premature axle failure.
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