Monroe Auto. Locking Hub

Fig. 7 Exploded view of Monroe automatic locking hub:

Description
This automatic locking hub, Fig. 7, when placed in four wheel drive, directs power to the front wheels. The front axle turns the axle shaft, activating the tri-cam mechanism, which then moves the drive gear outward into engagement with the ring gear.
When two wheel drive is selected, disengagement is accomplished by the reverse movement of the wheels, which causes the drive gear and tri-cam to rotate to the disengaged position, moving the drive gear out of mesh with the ring gear.



Removal
1. Remove tire and wheel assembly, hubcap and hub lock.
2. Remove spring retainer, then the loose spring.
3. Carefully pull hub lock assembly from wheel. If hub lock assembly will not slide out freely, rotate wheel to facilitate removal.

Disassembly
1. Position hub lock assembly with plastic bearing side facing downward.
2. Pry inboard spring from assembly, then remove spindle lock, thrust bearing and tri-cam assembly.
3. Clean adapter housing assembly. If any part of this assembly is worn, replace as necessary.
4. Slide ring gear from adapter housing, then remove the six ring gear springs.
5. Remove ring gear spring retainer.

Assembly
1. Install ring gear spring retainer.
2. Position the six ring gear springs into adapter housing.
3. Grease outside surface of ring gear, then install into adapter housing. Ensure gear teeth are closest to springs.
4. Insert and install ring gear retaining ring. Ensure ring gear springs are properly seated in adapter housing.
5. Grease tri-cam assembly, then install into adapter housing.
6. Install thrust bearing, spindle lock and inboard snap ring. Rotate spindle lock tangs in both directions to check for free movement.

Installation
1. Install hub lock by first sliding hub onto axle shaft spline, then guide hub into wheel hub spline. When hub lock bottoms out, rotate entire wheel while pressing inward on hub until hub lock tangs engage wheel bearing locknut. Allow hub lock to seat itself. Hub lock should not protrude more than 3/8 inch from face of wheel hub.
2. Install spring, then unlock hub lock by rotating wheel hub while applying force to drive gear spring.
3. Install spring retainer and spring.
4. Install hub cap.