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MAINTENANCE INSTRUCTIONS
4.8
5 Begin assembly of the locking mechanism by lightly coating all components with MIL-G-23827B (or
C), MIL-PRF-23827C, (or equivalent radiation resistant grease authorized by QSA Global, Inc.). Treat
all screw thread ends with Vibratite™ or Locktite™ thread sealant.
Mount the locking mechanism plate horizontally in a vise or fixture with the plunger lock and retainer
at a 12 o’clock position. (Note: Carefully mount the mounting plate in a vise or fixture so hands are
free for the assembly procedure and no damage to the mounting plate will occur.)
The narrow end of the lock slide slot must be located at the 3 o'clock position. Locate the lock slide
and return spring into the mating slot of the selector body.
Place the selector ring with the word CONNECT at the 12 o'clock position, over the selector body.
Push the lock slide inward during placement of the selector ring for clearance. Doing so will allow the
selector ring to rest flush on the selector body. Insert the anti-rotation lug springs at the top and
bottom of the selector body. Place the anti-rotation lugs over the springs.
Place the tungsten sleeve with the large diameter facing downward, on the center of the lock slide.
Place the compression spring over the sleeve.
Install the selector ring retainer into the selector ring. Verify that the three non-threaded holes line up
under the word CONNECT located on the selector ring. Depress the selector ring retainer into the
selector ring until it is flush with the top of the selector ring. Hold the selector ring retainer firmly
against the mounting plate until the 10-32 x 1¼ in screws are installed.
While firmly holding the locking mechanism against the mounting plate, turn the plate over to expose
the back side of the mounting plate. Install the four 10-32 x 1¼ in socket head screws to secure the
mechanism to the mounting plate. Torque the socket head screws to 30 in/lb (3.39 Nm) ± 5 in/lb (0.57
Nm) using a calibrated torque wrench.
6 Perform functional safety testing of the Posilok locking mechanism by the following:
Mount the locking mechanism plate vertically in a vise or mounting fixture with the plunger lock at the
12 o'clock position.
Insert the ‘U- tool’ into the top and bottom holes of the selector assembly and rotate the selector ring
toward the OPERATE position. Push the lock slide until the sleeve snaps into place.
While in the OPERATE position, wind out a short length of control cable and pass it through the front
of the selector assembly. Attach a mock source assembly or the test jumper connector to the control
cable connector and withdraw it into the selector assembly.
Pull on the section of control cable and confirm that the lock slide automatically secures the
connector. The lock slide must snap shut in a fast and smooth motion when triggered. Verify the
securement action of selector mechanism by attempting to both push and pull the mock source
assembly out of the selector mechanism while in the EXPOSE, LOCK and CONNECT positions.
Rotate the selector mechanism back to the OPERATE position and push in the lock slide to ensure
smooth operation and positive engagement. Attempt to push the lock slide towards the SECURED
position to test for a positive engagement of the sleeve in the lock slide. If a smooth operation is not
attained and/or the lock slide can be forced into the secured position by testing for positive
engagement, disassemble and thoroughly re-inspect for faulty components.
Thoroughly inspect all components for rough edges or burrs, etc. which could cause jamming or
irregular operation. Replace parts as necessary, re-lubricate and reassemble the selector assembly.
Repeat the functional safety testing to verify smooth and safe operation of the selector mechanism.
Do not install the serviced back plate (lock mechanism) module to the exposure device at this point.