8.5. Lock and drive of the lock of a door of a back

Possible malfunctions of the lock of a door of a back, their reason and ways of elimination

Fig. 8.20. Installation of the lock of a door of a back: 1 – back door lock; 2 – draft; 3 – lock switch lead; 4 – hook; 5 – key; 6 – lock switch; 7 – bolt of fastening of a hook; 8 – the washer is gear; 9 – a bolt of fastening of the lock 10 – a lamellar spring; 11 – spring


The lock of a door of a back of fork type, consists of actually lock connected through draft to the drive (fig. 8.20). Opens outside the same key, as side forward doors.

Replacement of a spring of the lock of a door of a back
1. Open a back door.
2. Disconnect draft 2 (see fig. 8.20) from a switch lead, having pulled draft on themselves.
3. Turn out two bolts of the 9th fastening of the lock to a door and remove the lock together with draft.
4. Exempt the lock from the remains of an old spring.

Fig. 8.21. Back door lock: 1 – doggie assembled; 2 – lock spring; 3 – washer; 4 – fork; 5 – lock case; 6 – case cover; 7 – axis; 8 – plug


5. Establish a new spring of 2 (fig. 8.21).
6. Check operation of the lock.
7. Push draft 2 (see fig. 8.20) through an opening in the internal panel of a door of a back and connect draft to a lead 3 switches of the lock.
8. Check operation of the lock with draft from a key 5, holding with a hand the lock on the place of its fastening.
9. Wrap two bolts 9 and carry out a final inspection of operation of the lock.

Replacement of a spring of the drive of the lock
The back door lock drive on a design is similar to the drive of locks of forward doors. You make replacement of a spring of the drive of the lock in such sequence.
1. Open a back door.
2. Disconnect draft 2 (see fig. 8.20) from a switch lead, having pulled draft on themselves.
3. Remove a lamellar spring 10 and take out the switch.
4. Beat out a pin of fastening of a lead to the cylinder of the switch and remove a lead 3.
5. Remove the spring remains from the switch case.
6. Install a new spring 11 on the case, without allowing overlapping of rounds and having provided gearing of its short moustaches with a cylinder groove.
7. Put on a lead the end of the cylinder, watching correctness of a relative positioning of a lead and the cylinder and press a pin.
8. Check correctness of operation of the switch, turning a key in the cylinder several times in different directions. At the same time the turned and lowered cylinder has to come back to a starting position under the influence of a spring.
9. Install into place the lock drive, having fixed it by a lamellar spring 10.
10. Connect draft 2 to a lead 3.
11. Check operation of the lock with the drive assembled.