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Mechanical Combination Lock 

M-LOCKS BV

 

 

Tel: +31 (0)314 376 876 

Vlijtstraat 40  

ver. 1.2  2017 12 11 

Fax: +31 (0)314 376 878 

NL-7005 BN Doetinchem 

www.m-locks.com

 

4 x

 

Turn LEFT, pass first code number three times and stop exactly on the number on 
the 

Changing

 

Index

 the fourth time. 

 

3 x

 

Turn RIGHT, pass second code number twice and stop exactly on the number on 
the 

Changing Index

 the third time. 

 

2 x

 

Turn LEFT, pass third code number once and stop exactly on the number on the 

Changing Index

 the second time and stop. 

 
After the new Code is completely entered,

 turn change key LEFT and remove it.

  The new Code is 

installed. 
 
When turning the dial, if a number is passed, start over at the beginning. 
 

Try the new code several times (using Opening Index) before closing the door! 

 
DATA SHEET 
  

Mechanics 

Opening 

manually 

Locking 

manually 

Blocking element 

3 Wheels 

Mounting dimensions 

standard 

Certifications 

 

VdS 

Class 2 

EN1300, ECB-S, CNPP, 
A2P 

Class B 

UL 

Group 2M 

DNV 

158-2 Listed 

IMP 

Klasa B 

 
 

What if … 
…accidentally the cam got moved before installation? 

 
As long as the code has not been changed with the change key, the lock can be prepared for 
mounting following the steps below: 

1.  Hold the lock so that you look at the cover and the bolt is to the right. 
2.  Turn the cam clockwise minimum 4 complete turns and stop when the cam is lined up as 

shown in figure 1.  

3.  Turn cam counterclockwise until lock opens.  The cam should be lined up with the “LOCK 

OPEN” line on the cover (see figure 2). 

 

 
 
 

 
 
 
 
 
 

…the dial is hard to turn or the dial is rubbing on the dial plate? 

 
Loosen the screw that holds the shaft in the dial and pull out the dial slightly. Then tighten the screw 
hand tight.  Do not over tighten as that will pull the dial back in.  Use liquid thread-lock like Loctite™ if 
required.

 

 

 

 

4x 

figure 1 

figure 2 

Summary of Contents for ML6740

Page 1: ...TERISTICS The ML 6740 is a manipulation proof 3 wheel combination lock with new features making it very easy to mount VdS Kl 2 EN1300 Class B ECB S CNPP IMP DNV The lock has the standard foot print 66...

Page 2: ...t move the cam part with square hole or the bolt During installation the bolt must stay in retracted position and the cam lined up as shown left Only use the delivered 3 mounting screws 3x M6 with US...

Page 3: ...which the lock opened on the CHANGING INDEX Example If the lock opens at 49 4 x LEFT until 49 stops exactly at the Changing Index 1 Carefully insert change key on the inside of the safe door Slightly...

Page 4: ...pening manually Locking manually Blocking element 3 Wheels Mounting dimensions standard Certifications VdS Class 2 EN1300 ECB S CNPP A2P Class B UL Group 2M DNV 158 2 Listed IMP Klasa B What if accide...

Page 5: ...security lock when the safe is open Par example by a with a screws fixed interior cover The lock housing must be protected against destructive attacks from outside with suitable protective materials...

Page 6: ...S 2A spindle groove on 44 Assemble the ring so that the opening symbol is perpendicular above Cut spindle to length so that the spindle end levels with the cam Don t let spindle stick out Twist dial h...

Page 7: ...e correct code has not been dialed to the Changing Index on the dial Take out the key and dial the valid code again Now dial your new code using the CHANGING INDEX f e 10 20 30 see user instructions o...

Page 8: ...ECB S CNPP A2P Class B What if accidentally the cam got moved before installation As long as the code has not been changed with the change key the lock can be prepared for mounting following the step...

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