LOCKING HUBS
1993 Mitsubishi Montero
1993 Drive Axles - Locking Hubs
Ram-50, Montero & Pickup
DESCRIPTION
Montero is equipped with an automatic locking clutch. Locking
clutch engages, providing full time AWD operation, when 4WD (4H) is
selected at transfer case, at speeds up to 62 MPH. Selecting center
differential lock position (4HLc or 4HLLc), while in AWD at 4 MPH or
less, provides 4WD operation. Center differential lock disengages when
4H or 2H are selected. Locking clutch disengages when 2H is selected.
On Pickup and Ram-50, automatic locking hubs are engaged by
rotational force of axle shaft when 4WD is selected at transfer case.
Locking hubs disengage when 2WD is selected or vehicle is driven in
Reverse. Cams, brakes and springs are used to lock or unlock locking
hubs.
Engagement is accomplished through gears and spring actions
within hub. When hub is locked, hub brake engages inner hub, which is
connected to axle shaft by inner splines of hub. Hub brake is
connected to hub body by outer splines.
REMOVAL & INSTALLATION
AUTOMATIC LOCKING HUBS
Removal & Installation (Montero)
1) Remove right side inner shaft for automatic locking clutch
removal. See INNER SHAFT & BEARING in DIFFERENTIALS & AXLE SHAFTS -
FRONT article. With inner shaft removed, remove locking clutch engage
switch. See Fig. 1.
2) Remove 4 inner shaft tube-to-differential mounting bracket
bolts. Pivot differential mounting bracket. Remove 4 inner shaft tube-
to-differential carrier assembly mounting bolts. Pull inner shaft tube
and automatic locking clutch out of differential carrier assembly.
3) To install, reverse removal procedure. Tighten inner shaft
tube bolts to 65 ft. lbs. (90 N.m) and locking clutch engage switch to
26 ft. lbs. (36 N.m).
Fig. 1: Removing Automatic Locking Clutch (Montero)
Courtesy of Mitsubishi Motor Sales of America.
Removal (Pickup & Ram-50)
1) Hub must be unlocked. To unlock hub, place transfer case
lever in 2H position, and move vehicle in Reverse approximately 4-6
feet.
2) Remove cover from locking hub. If hub cover cannot be
loosened by hand, wrap shop towel around cover, and use an oil filter
wrench to loosen cover.
3) Raise and support vehicle. Remove wheel assembly. Using
snap ring pliers, remove snap ring and shim from end of axle. Remove
locking hub retaining bolts. Remove locking hub.
Installation (Pickup & Ram-50)
1) To install, reverse removal procedure. Apply sealant to
contact areas between locking hub assembly and rotor assembly. DO NOT
apply sealant on outer areas of rotor assembly, toward brake contact
areas.
2) Align locking hub assembly key with steering knuckle key
way. Loosely install locking hub assembly on rotor assembly. Ensure
locking hub assembly fully contacts rotor assembly.
3) Install locking hub retaining bolts and tighten to 36-43
ft. lbs. (49-58 N.m). Using spring scale attached to wheel stud,
measure turning resistance required to rotate hub assembly.
4) Turning resistance should not exceed 3.1 lbs. (1.4 kg). If
turning resistance exceeds specification, check for incorrect
installation of locking hub assembly or components.
5) Install shim and snap ring on drive axle. Rotate drive
axle until maximum end play is obtained. Using a dial indicator, check
drive axle end play.
6) Drive axle end play should be .008-.020" (.20-.51 mm). If
axle end play is not within specification, adjust end play by changing
axle shaft shim. Install hub cover. Tighten hub cover bolts to 13-25
ft. lbs.(18-34 N.m).
OVERHAUL
NOTE: Locking clutch overhaul procedure for Montero is not
available from manufacturer. See Fig. 2 for exploded view of
locking clutch.
Fig. 2: Exploded View Of Locking Clutch (Montero)
Courtesy of Mitsubishi Motor Sales of America.
Disassembly (Pickup & Ram-50)
1) Remove locking hub. AUTOMATIC LOCKING HUBS under REMOVAL &
INSTALLATION. Push brake "B" in hub housing, and remove housing "C"
ring. See Fig. 3. Using Adapter (MB990811-01), lightly press drive
gear assembly, and remove "C" ring from retainer "B". Slowly release
drive gear assembly.
2) Remove drive gear assembly, slide gear assembly and return
spring. Remove slide gear "C" ring. Remove shift spring.
Fig. 3: Exploded View Of Locking Hub
Courtesy of Mitsubishi Motor Sales of America.
Inspection (Pickup & Ram-50)
1) Check drive gear and slide gear splines for damage. Check
cam portion of retainer "A" for wear or damage. Check cam for wear and
damage. Check slide gear and housing tooth surfaces for damage. Check
retainer "B" and housing contact surfaces for wear and damage.
2) Check brake assembly thickness. See Fig. 4. Assemble brake
"A" and brake "B". Using slide calipers, measure thickness of
assembled brake at both brake "A" lugs.
3) Standard thickness is .413" (10.49 mm). Minimum thickness
is .378" (9.60 mm). If measured thickness is less than minimum
thickness, replace brake "A" and brake "B".
4) Measure length "A" of return spring. See Fig. 5. Ensure
length "A" is 1.38" (35.1 mm). If length "A" is not as specified,
replace return spring.
5) Measure length "B" of shift spring. See Fig. 5. Ensure
length "B" is 1.18" (30.0 mm). If length "B" is not as specified,
replace shift spring.
Reassembly (Pickup & Ram-50)
Pack grooves of retainer "B" with multipurpose grease, and
apply grease to attaching surfaces of all components. To complete
assembly, reverse disassembly procedure.
Fig. 4: Measuring Brake Assembly Thickness
Courtesy of Mitsubishi Motor Sales of America.
Fig. 5: Measuring Lengths Of Return Spring & Shift Spring
Courtesy of Mitsubishi Motor Sales of America.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS TABLE
Application Ft. Lbs. (N.m)
Hub Cover ........................ 13-25 (18-34)
Locking Hub Bolts ................ 36-43 (49-58)
