Sentry made safes with 3- and 4-number combinations. The pattern is related to the left/right/left but you have to spin the dial more than 360 degrees on some numbers in the combination. The pattern to unlock the safe for the 3- number combination models is: turn the knob to the left so that 0 passes the pointer three times before you stop at the first number. Turn the knob to the right and stop the second time that the pointer aligns with the second number. Then turn the knob to the left again and stop the first time the third number lines up with the pointer.
For the 4-number combination safes, you start turning the knob so that 0 passes the pointer four times before you stop at the first number. Turn the knob to the right and stop the third time the second number aligns with the pointer. Turn the knob to the left again and stop the second time the third number aligns with the pointer. Finally turn the knob to the right and stop the first time the final number aligns with the pointer.
Sentry has the manuals for many of their safes on their support site: https://www.sentrysafe.com/support/product-manuals . The direct link to the manual for the 1310 is currently https://cdn.masterlock.com/sentrysafe/resources/pdf/manuals/Sentry-SLS-Old-Models-Instructions.pdf .
Answers & Comments
Sentry made safes with 3- and 4-number combinations. The pattern is related to the left/right/left but you have to spin the dial more than 360 degrees on some numbers in the combination. The pattern to unlock the safe for the 3- number combination models is: turn the knob to the left so that 0 passes the pointer three times before you stop at the first number. Turn the knob to the right and stop the second time that the pointer aligns with the second number. Then turn the knob to the left again and stop the first time the third number lines up with the pointer.
For the 4-number combination safes, you start turning the knob so that 0 passes the pointer four times before you stop at the first number. Turn the knob to the right and stop the third time the second number aligns with the pointer. Turn the knob to the left again and stop the second time the third number aligns with the pointer. Finally turn the knob to the right and stop the first time the final number aligns with the pointer.
Sentry has the manuals for many of their safes on their support site: https://www.sentrysafe.com/support/product-manuals . The direct link to the manual for the 1310 is currently https://cdn.masterlock.com/sentrysafe/resources/pdf/manuals/Sentry-SLS-Old-Models-Instructions.pdf .
I hope this helps.
Cindy Wells