Powertrax 4120 User Manual
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(and thrust block, if used) are in place and that the springs are
working properly.
When the above installation steps are completed, all
the parts should be in exactly the same positions as they were
when the installation began. The backlash and pre-load settings
should be unchanged from before and no further adjustments
will be needed. To be certain, rock the ring gear back and forth to
see if the backlash appears to be the same as it was prior to the
installation. If not, it will need to be reset with a dial indicator as
described in the shop manual. Rotate the ring gear one revolu-
tion to be sure that nothing is binding.
Third Member Installation
1. Clean the mating surface of the axle housing and the
mounting surface of the differential carrier.
2. Clean the inside of the axle housing to remove all
foreign material. This step is very important because metal
chips can interfere with the operation of your new LOCK-RIGHT.
3. Remove metal chips from the drain plug if it is mag-
netic.
4. Install a gasket and/or sealant as appropriate.
5. Lift the third member into the axle housing and
shove it into the studs.
6. Install and torque the hardware.
7. Re-install the axle shafts and finish the remaining
vehicle re-assembly steps.
Vehicle Final Assembly
Add gear oil. Note that we suggest using medi-
um-to-heavy oils as recommended by the manufacturer, unless
the vehicle will be used in very cold weather. Thicker oil, such
as 85-140, reduces the “clicking” noise sometimes heard during
tight turns and provides adequate lubrication when the assembly
becomes hot. Also see the section in the Vehicle Operators Man-
ual regarding temperature.