MOS-94P Multiple Launch Rocket System (MLRS) Repairer M142 HIMARS Download
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a. Manually extend the boom 3 to 4 feet. b. Remove the drive shafts from both actuators. c. Remove the forward support assembly to bracket. d. Remove the tube assembly from actuator. e. Rotate both ball nut drive assemblies to clear rear support on intermediate beam. f. Remove the actuator from cage. g. Remove the rear tube support and ball nut drive assembly. 3. Measure and record the distance from the ball nut drive to the edge of the actuator gear housing. 4. Install the boom extension actuator. a. Replace the bushing, sleeve, and seal. b. Install the ring on sleeve and secure with lock washer and spanner nut. c. Position the rear tube support and ball nut drive assembly. d. Secure the rear tube support to ball nut drive assembly. e. Rotate the ball nut drive assembly to position recorded during removal. f. Slide actuator to the rear until you install actuator to cage. g. Rotate both the ball nut drive assemblies to clear rear support on the intermediate beam. h. Slide the tube assembly through forward mount assembly and rear tube support. i. Install the drive shaft to actuator and motor and reduction gearbox. j. Secure the forward tube support to bracket. 5. Measure the gap between the forward pull collar and the support assembly. Manually retract the boom to full in position while checking that the boom travel is smooth and not binding. 6. Verify the boom extension actuator is operational. 7. Complete maintenance forms. 3-32 1 October 2014