Advertisement
Troubleshooting/Dialing Diagnostics
Model 6730, 6735, 6738, 6741 Mechanical Combination Lock
A guide to solving safe lockouts through
knowledge, rather than force
L
D
ockout
iagnostics
Between 80 and 90% of all safe lockouts can be overcome
without the need to penetrate a safe. A combination lock is a
finely tuned mechanical puzzle whose answer is known only to
those who possess the combination and can use it to correctly
and precisely align internal parts of the lock. Unfortunately,
even the tiniest misalignment of components can (and often
does) change the answer to the puzzle, or simply make the
puzzle more difficult to solve.
P
D
t
roPer
iaLing
echnique
A very high percentage of lockouts are due to the end user's
improper dialing of the combination lock. There is a simple,
definite procedure which must be followed to achieve consis-
tent success. An important point to remember is that there are
usually two index lines on a dial ring. The one at the twelve
o'clock position is used in dialing open the lock. The mark at
the eleven o'clock position (if present) is used only for chang-
ing the combination.
While performing any procedure involving dialing numbers into
the lock, it is important to view the dial and ring straight on.
This helps ensure the number you are entering will be aligned
directly under the index mark. If you dial past the intended
number even slightly, begin the entire dialing procedure again.
© Copyright 2006, Sargent & Greenleaf, Inc.
The procedure for a Sargent & Greenleaf three-wheel lock is
as follows:
1. Turn the dial left (counterclockwise), stopping the fourth
time the first number of the combination aligns with the
opening index.
2. Turn the dial to the right (clockwise), stopping the third
time the second number of the combination aligns with the
opening index.
3. Turn the dial to the left (counterclockwise), stopping the
second time the third number of the combination aligns
with the opening index.
4. Turn the dial to the right. Some resistance should be felt
as the mark representing "5" comes under the opening
index, and the dial should reach a positive stop near "95."
The lock is now open, and any other action necessary to
open the safe should be performed.
During the dialing process, it is normal to feel more resistance
each time the dial is turned a complete revolution. Each turn
of the dial engages another part of the mechanism, creating
more resistance to dialing.
The procedure for a Sargent & Greenleaf four-wheel lock is as
follows:
1. Turn the dial to the right (clockwise), stopping the fifth
time the first number of the combination aligns with the
opening index.
2. Turn the dial left (counterclockwise), stopping the fourth
time the second number of the combination aligns with the
opening index.
3. Turn the dial to the right (clockwise), stopping the third
time the third number of the combination aligns with the
opening index.
4. Turn the dial to the left (counterclockwise), stopping the
second time the fourth number of the combination aligns
with the opening index.
5. Turn the dial to the right (clockwise). Some resistance
should be felt as the mark representing "5" comes under
the opening index, and the dial should reach a positive
stop near "95." The lock is now open, and any other action
necessary to open the safe should be performed.
9
Advertisement
