Insert dial into dial ring and hold snug.
h) Carefully thread the dial spindle onto the drive cam until snug.
DO NOT FORCE DIAL.
i) Measure the excess spindle length, unscrew, remove, and
carefully cut off excess, leaving 1/16 inch (2 mm) above drive cam. Remove
j) Rethread the dial spindle onto the drive cam until snug and back
off until the keyways in the spindle and drive cam line up.
k) Insert the spline key. Drive the spline key in carefully. If
the spline key becomes loose, the lock will not function properly. Make
certain that the spline key is tight.
1) Attach the back cover using the cover mounting screws.
is now ready to have the new combination set.
Maintenance Recommendations. Periodic servicing will extend the
life of the lock and is essential for maintaining proper security. Each time
the combination is changed, inspect the lock for wear, metal filings, drilled
holes, cracks, or any other visual signs of attempts to defeat the lock by
forced entry techniques. The inspection process should include removal of the
back cover of the lock, and visual examination of each wheel part as well as
the cam and lever assembly to make sure nothing is worn or damaged. If
lubrication is required, use molybdenum-disulfide (powder). NEVER use oil- or
petroleum-based lubricants on combination locks.
Each time the back cover is removed, the combination should be
reset. Remember to check the combination at least three times before locking
Any maintenance other than changing the combination and inspecting
the lock should be referred to a qualified locksmith.
MRK 302-402. The Mosler MRK 302-402 Groups 1 and 1R combination
locks have a unique manipulation-resistant cam mechanism. Two audible im-
pulses can be heard when the dial is turned past the zero area. The purpose
of this feature is to defeat manipulation by the use of audio instruments.
When the MRK 302-402 was first introduced, the dial and dial ring remained the
same as the MR 302-402 Hand-Change lock (i.e., one index on the face of the
lock used for opening the lock and changing the combination). If your MRK
302-402 has only one index, refer to paragraphs 18.104.22.168 and 22.214.171.124 of this
handbook for opening and combination changing procedures. The more recent MRK
302-402 has both an opening index and a changing index on the face of the
lock. The difference between the MRK 302 and the MRK 402 is that the 302 has
three wheels and a three-number combination whereas the 402 has four wheels
and a four-number combination. There is no dial torque