Changing ND series keycams

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To convert from a ND95 to a ND75 remove the outside keycam and replace it with the N123-009 keycam.
To convert a Schlage ND80 to a ND70 you can replace the keycam or chassis and use your existing trim. Ordering Instructions: Keycam only: N123-010 Chassis and springcages: ND70LD LLL 626 LL...
A design change occurred in 2001 to address a locking/unlocking issue with the discontinued D73 lever locks.  This included modifying the cam and plug, spindle and using a different plung...
 The Schlage ND75 and ND95 locks require the chassis to be assembled and timed correctly for operation.  If the chassis has to be disassembled for any reason please refer to the Assembling Schlage ...
The keycam may have failed, example here, the latest design keycam can be easily identified as the colored changed to black. Replace either the keycam or chassis as needed to r...
 This could also happen if the tailpiece isn't installed in a KIL, FSIC, or SFIC cylinder.  The FSIC driver also could have come loose from the core in the spindle.
See here for standard ND Keycam part numbers and what functions they belong to.See here  for special ND Keycam part numbers and what functions they belong to. 
The ND40 does not have this option.  You will need to look at a mortise lock, L9496, or a deadbolt such as the B571.
1 1/8" mortise cylinders fit the 650 series keyswitch.  The 650 series keyswitch when ordered with the cylinder, will come complete with the correct cylinder, cam, and any required blocki...
If blocking rings (PN 36-079) are needed, specify dimensions when ordering. See below for blocking ring (PN 36-079) dimensions.  Blocking Ring  Specify Dimension  1//8" ...