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Replace a recessed lock

Most of the communication doors and entrance doors are composed of a cleat frame, an internal honeycomb structure and two faces of plywood or fibreboard, the assembly being held together by gluing. This is called an "isoplane" door. Their lock is embedded in the outer edge (it is called lock "to lard"). The replacement of this type of lock requires care and method.

Necessary material

  • Flat blade screwdriver
  • Phillips screwdriver
  • Hammer

Steps

  1. Dismantling the faulty lock
  2. Installation of the new lock

Dismantling the faulty lock

Dead hook

Dead hook

1. The recess bolt justifies the replacement of the lock, this defect is generally not repairable.

Undo the screws of the handle plate

Undo the screws of the handle plate

2. Undo the top and bottom screws of the handle plate. Avoid the use of an unscrewing machine which, by ripping, may damage the handle plate.

Clear the plate and the handle

Clear the plate and the handle

3. Release the plate and handle from the square rod. Collect the other handle plate, being careful not to drop the square.

Undo the screws on the edge

Undo the screws on the edge

4. Undo the upper fixing screw and then the lower fixing screw on the edge of the door.

Unlock the lock

Unlock the lock

5. Insert the screwdriver shaft into the hole in the square. Pull laterally to dislodge the top of the lock. Do the same at the key hole to disengage the lock from its slot from below.

Extract the lock

Extract the lock

6. Unlock the lock and pull it straight out of the slot.

Installation of the new lock

Engage the lock

Engage the lock

7. Engage the new lock in its housing.

Lock the lock

Lock the lock

8. Make a few hammers on the edge of the lock to fit it.

Tighten the fixing screws

Tighten the fixing screws

9. Tighten the upper fixing screw and then the lower fixing screw.

Engage the square rod

Engage the square rod

10. Engage the square rod mounted on the plate into the follower (square hole in the lock). Move the two handles closer together.

Reassemble the screws of the handle plate

Reassemble the screws of the handle plate

11. Reassemble the upper screw on the handle plate and the lower screw on the handle plate.

Lubricate the lock

Lubricate the lock

12. Tuck the bolt and lubricate the inside of the lock. Maneuver the handle a few times.

Wipe out oil overflows

Wipe out oil overflows

13. Wipe off excess lubricant and test the operation and resistance of the lock.

(photos / visuals: © DIY-Prod, except special mention)

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