F 350 4WD Pickup V8-7.3L DSL Turbo VIN F (1994)
Wheel Hub (Locking): Pinpoint Tests
Pinpoint Test
PINPOINT TEST A: RATCHETING OR BUZZING NOISE FROM FRONT AXLE WHILE ENGAGING IN FOUR WHEEL DRIVE
A1 VERIFY LUBRICANT
Verify front axle differential lubricant is 1.66 Litres (56 oz) of 4x4 Gear Oil F1TZ-19580-A (WSL-M2C191-A).
NOTE: There is no equivalent for FlTZ-19580-A (WSL-M2C191-A). Do not substitute any other lubricant.
Is lubricant to specifications?
Yes
-
GO to A2.
No
-
REPLACE differential lubricant with 1.66 litres (56 oz) of 4x4 Gear Oil F1TZ-19580-A (WSL-M2C191-A). GO to A2.
A2 VERIFY IIUB LOCKS ARE OPERATIONAL
Verify that the hubs lock and unlock using procedure in this section.
Do hub locks work properly?
Yes
-
Road test vehicle. GO to A3.
No
-
INSPECT nght and left side hub locks and REPLACE as necessary. INSPECT associated camming and REPLACE camming if damaged. Repeat
A2. If hub lock is satisfactory, GO to A3.
A3 VERIFY OUTPUT OF TRANSFER CASE CLUTCH
While road testing vehicle, push 4x4 button.
Does vehicle shift to 4x4 mode with no buzzing or ratcheting noise?
Yes
-
Repair is complete.
No
-
REPLACE clutch coil, housing, lock up collar, lock up fork, return spring and sleeve spring. Repeat road test procedure.
