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|  MIL-H-63192 (AR)
4. 5.3.8 Recoil mechanism testing.-Each howitzer subjected
to proof firing testing of 4.5.3.3 shall be examined for
compliance with the requirements of 3.3.15.1 through 3.3.15.4.
Failure of the howitzer to complY with the specified requirements
shall be cause for rejection.
Testing shall be as specified in
4.6.15.
4.5.4 Inspection equipment.-Unless otherwise specified
herein, responsibility for acquisition, calibration, maintenance
and disposition of acceptance inspection and test equipment on
List of Inspection Equipment Number EL 1201OOOO-I and for all
other inspection equipment required by applicable specifications,
shall be in accordance with MIL-I-45607.
4.6
Test
methods
4.6.1 Lunette assembly test.-Disengage the spring detent
by pulling out the lunette operating lever knob and rotating
the lever to the down position.
After moving the lunette to
the tow position, rotate the lunette operating lever to the
rear until the spring detent locks the lunette in place.
Repeat the procedure for placing the lunette in the down and
firing position.
4.6.2 Locking device test.-All locking devices shall be
tested for secure assembly and positive action.
4.6.3 Handbrake test.-The howitzer, in the travel lock
and towing position, shall be placed on a 15 degree slope with
the handbrakes applied.
The surface texture of the slope shall.
be such that the tires will not slip.
When the hand-brakes are
disengaged, the tires shall rotate freely.
The requirement may
also be checked by applying an 800 + 80 pound push or pull force
on the lunette with the weapon in the travel position on a level
surface, or by applying a 500 + 50 pound-foot torque to each
wheel.
4.6.4 Trunion adapter plate test.-A calibrated gunner's
quadrant and trunion adapter plate inspection equipment shall be
used to determine trunion cross-level and trunion adapter plate
to cannon tube parallelism.
4.6.5 Wheel actuator test.-With the howitzer in the travel
lock and towing position, release both handbrakes.
Disengage the
suspension travel lock by pushing down the travel lock release
lever.
If the travel lock does not move, turn the actuator crank
counter `clockwise to relieve the pressure on the travel lock.
15
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