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Figure 1-20. Instrument Panel
Figure 1-22.   Troubleshooting Aid

TM-9-2320-366-34-1 M1078 Series 2 1/2-Ton 4x4 Light Medium Tactical Vehicles (LMTV) Manual
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TM 9-2320-366-34-1 1-14.   ELECTRICAL SYSTEM (CONT) Figure 1-21. Material Handling Crane (MHC) System h.  Material  Handling  Crane  (MHC).  The  primary  electrical  components  of  the  MHC  System  are  the  REMOTE CONTROL UNIT (1, Figure 1-21), junction box (2), overload shutdown box (3), tension load cell (4), left and right side jack cylinder proximity sensors (5) and several function and lockout solenoids.   When the operator selects an MHC function using the REMOTE CONTROL UNIT, electrical current is sent through the junction box and to the appropriate solenoid.   When energized from the REMOTE CONTROL UNIT, the function solenoid controls hydraulic pressure to the function selected by the operator.  When the function solenoid is de-energized, hydraulic pressure is removed and the function stops. The overload shutdown system controls the lockout solenoids.   The lockout solenoids prevent operation  of  certain  MHC  functions  when  an  overload  condition  is  sensed.    Overload  conditions  are  sensed,  in combination, by the tension load cell and a microprocessor inside the overload shutdown box which monitors boom angle and extension.  When an overload condition is sensed, the boom up/boom down, hoist up, telescope out functions are locked out.   The hoist down and telescope in functions will still operate and allow the operator to safely lower the load to the ground.   When the power switch on the remote control box is used as an emergency shutdown, all MHC functions are locked out.  The left and right side jack cylinder proximity sensors prevent operation of the MHC until both jack cylinder outrigger pads are lowered fully to the ground. 1-28







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