The device of the mechanism of automatic blocking of the hub (1983-98)
1, 11. Brake B; 2, 14, 21. Brake A; 3, 12.27. Thrust ring A; 4, 13, 26, 28. Cam; 5, 15. Mobile gear; 6, 20. Drive gear; 7, 10. Body; 8, 16. Shear spring; 9, 17. Return spring; 18, 23. Wheel unlocked; 19, 24. Blocked; 22. The tongue of the thrust ring A; 25. Cam in engagement with the tongue of the thrust ring
Hub parts with automatic locking mechanism
1. Cap; 2. Retaining ring; 3. Washer; 4. Front brake; 5. Bolts; 6. Locking mechanism; 7. Washer; 8. Lock washer; 9. Locknut; 10. Front hub
Details of the automatic hub lock mechanism
1. Cap; 2. Ring; 3. Housing; 4, 9. Split ring; 5. Brake B; 6. Brake A; 7. Brake spring; 8. Retaining ring; 10. Pinion block; 11. Mobile gear block; 12. Return spring; 13. Thrust sleeve B; 14. Bearing; 15. Pinion retaining ring; 16. Thrust ring A; 17. Drive gear; 18. Travel gear ring; 19. Cam; 20. Holder; 21. Spring; 22. Travel gear
Disassembly and assembly
1. Unlock the hub, to do this, move the transfer case lever to the 2H position and back up 1–2 m.
2. Remove the front wheels.
3. Remove the hub cap, if necessary, release the cap with an oil filter wrench, wrapping it with a rag.
4. Remove the retaining ring from the axle shaft and remove the washer.
5. Turn away 6 bolts and remove the mechanism of an unblocking.
6. Using a thin, flat tool, remove the split ring by depressing the brake (IN).
7. Remove brake A, brake B and spring.
8. Remove the retaining ring of the mechanism housing.
9. Using a press MB990811-01, slightly depress the drive gear and remove the split ring of holder B (the stroke of the press must be at least 40 mm, i.e. the length of the straightening of the spring, and the force should not exceed 20 kgf).
10. Slowly release pressure and remove pinion gear, vane gear, and spring. First make sure that the thrust ring A is not stuck on the bushing B.
11. Remove thrust bushing B and bearing.
12. Remove retaining ring (to be replaced), remove thrust ring A and drive gear.
13. Remove the travel pinion retaining ring. To do this, press the cam and, with the spring depressed, remove the ring.
14. Next, remove the cam, spring retainer, spring, and sliding gear.
15. Assembly is carried out in the reverse order, taking into account the following.
16. Lubricate thrust bush B and brake B with SAE J310A or NLGI N3 grease.
17. Before installing the assembled locking mechanism, use a dynamometer hooked to the wheel stud to check the force of turning the hub.
18. Lubricate the contact points of the lock mechanism housing and hub with 3M ART N 8661 or N 8663 sealant or equivalent.
19. Install the housing, aligning the protrusion on the brake B with the groove on the knuckle trunnion (1 - groove, 2 - ledge, 3 - brake B).
20. Tighten the hub bolts with a torque of 50–60 N·m, and again measure the hub turning force. The force difference must not exceed 1 Nm, otherwise disassemble and reassemble the locking mechanism.
21. Tighten the connections to the required torque.
22. Tighten the cap with a torque of 18–35 Nm.