Condition Possible Causes Correction
Gear Teeth Broke 1. Overloading. 1. Replace gears. Examine other
gears and bearings for possible
damage.
2. Erratic clutch operation. 2. Replace gears and examine the
remaining parts for damage. Avoid
erratic clutch operation.
3. Ice-spotted pavement. 3. Replace gears and examine
remaining parts for damage.
4. Improper adjustments. 4. Replace gears and examine
remaining parts for damage.
Ensure ring gear backlash is cor-
rect.
Axle Noise 1. Insufficient lubricant. 1. Fill differential with the correct
fluid type and quantity.
2. Improper ring gear and pinion
adjustment.
2. Check ring gear and pinion con-
tact pattern. Adjust backlash or pin-
ion depth.
3. Unmatched ring gear and pin-
ion.
3. Replace gears with a matched
ring gear and pinion.
4. Worn teeth on ring gear and/or
pinion.
4. Replace ring gear and pinion.
5. Loose pinion bearings. 5. Adjust pinion bearing pre-load.
6. Loose differential bearings. 6. Adjust differential bearing pre-
load.
7. Mis-aligned or sprung ring gear. 7. Measure ring gear run-out.
Replace components as necessary.
8. Loose differential bearing cap
bolts.
8. Inspect differential components
and replace as necessary. Ensure
that the bearing caps are torqued
tot he proper specification.
9. Housing not machined properly. 9. Replace housing.
HYDRA-LOKT
(1) Park the vehicle on a level surface or raise
vehicle on hoist so that the vehicle is level.
(2) Remove the axle fill plug.
(3) Verify that the axle fluid level is correct. The
fluid level is correct if the fluid is level with the bot-
tom of the fill hole.
(4) Drive the vehicle in a tight circle for 2 minutes
at 5mph to fully prime the pump.
(5) Block the front tires to prevent the vehicle
from moving.
(6) Shift the transmission into the neutral.
(7) Raise both the wheels of rear axle of the
ground.
(8) Rotate the left wheel by hand at a minimum of
one revolution per second while an assistant rotates
the right wheel in the opposite direction.
(9) The left wheel should spin freely at first and
then increase in resistance within 5 revolutions until
the wheels cannot be continuously rotated in opposite
directions.
(10) The Hydra-Lokt differential has engaged
properly if the wheels cannot be rotated in opposite
directions for a moment. After the wheels stop rotat-
ing for a moment, the fluid pressure will drop in the
differential and the wheels begin to rotate once
again.
(11) If the system does not operate properly,
replace the Hydra-Lokt differential.
STANDARD PROCEDURE - DRAIN AND REFILL
(1) Drive the vehicle until the differential lubri-
cant is at the normal operating temperature.
(2) Raise vehicle on hoist.
3 - 14 REAR AXLE - 226RIA ZB
REAR AXLE - 226RIA (Continued)
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