6.2.1. Maintenance

Periodically remove a brake drum and check a condition of its working surface and degree of wear of brake frictional slips.
Clear blocks of dirt; when oiling surfaces of slips smooth out them a grinding skin.
Razzhimna periodically disassemble the mechanism, clear of dirt and put fresh lubricant, thus lubricant should not get on a drum and frictional slips.
Turn attention to correctness of gearing of a doggie and the sector of the lever of parking brake system and to a condition of their teeths.

Adjustment

Fig. 267. Drive of the parking brake mechanism: 1 – the drive lever with the sector; 2 – finger;
3, 13 – the forelock; 4 – switch of a signal of the parking brake system; 5 – nut; 6 – washer; 7 – drive cable; 8 – bolt; 9 – the washer is spring; 10 – adjusting screw; 11 – the spring is ottyazhny; 12 – spring arm; 14 – intermediate lever; 15 – draft of the drive; 16 – lock-nut; 17 – adjusting fork; 18 – drive lever; 19 – washer


You carry out adjustment when the working course of the lever 1 (see fig. 267) makes more than a half of the maximum course.
Increase in the course of the lever can happen for two reasons:
– because of big gaps between blocks and the brake drum. In this case adjust a gap;
– because of a drive cable pulling. In this case adjust a cable tension.
You carry out adjustment of gaps between blocks and the brake drum in the following order:
1. Install the lever of inclusion of the lowering transfer of the transfer case to neutral situation and switch off the forward bridge.
2. Move the lever 1 (see fig. 267) to extreme lower situation.
3. Lift a jack one of back wheels of the car.
4. Wrap the adjusting screw 10 clockwise so that the brake drum was not turned from efforts of a hand.
5. Unscrew the adjusting screw on 4–6 clicks (0,3–0,5 turns) that the drum was rotated freely without zadevaniye for blocks.
7 regulate a tension of a cable in the following order:
1. Put the lever of 1 drive in extreme lower position.
2. Turn off a lock-nut of the 16th adjusting fork 17, a rasshplintuyta and take out the finger connecting a fork 17 to the lever 18.
3. Screwing a fork on draft 15, choose all gaps in the drive; if there was not enough carving length on draft, it is necessary to rearrange the top tip of a cable 7 in an opening And.

Fig. 266. Parking brake mechanism: 1 – adjusting fork; 2 – lock-nut; 3 – draft of the drive; 4 – razzhimny cracker; 5 – cap; 6 – drive lever; 7 – adjusting screw; 8 – block support;
9 – pusher of the razzhimny mechanism; 10 – case of balls; 11 – case of the razzhimny mechanism; 12 – brake drum; 13,18 – blocks; 14 – coupling spring of blocks; 15 – cap; 16 – ball of the razzhimny mechanism; 17 – bolt; 19 – brake board; 20 – case of the adjusting mechanism; 21 – core; 22 – spring; 23 – spring cup; and – a view with the brake drum; – a look without brake drum


After the choice of gaps in the drive by effort of a hand combine openings in a fork 17 and the lever 18, implant a finger and check a free wheeling of the case of 10 balls (see fig. 266).
If the free wheeling is absent, then it is necessary to take out the finger connecting a fork 17 and the lever 18 (see fig. 267), to turn off a fork on 2–3 turns and again to connect a fork and the lever. At emergence of a notable free wheeling of the case of 10 balls (see fig. 266), a zashplintuyta a finger also tighten a lock-nut 16 (see fig. 267).
At the correct adjustment the working course of the lever 1 has to correspond to 3-4 clicks of a doggie of the lever.