TM 5-3805-264-14&P
Table 4-3. Unit Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
MCS (M917A1 W/MCS)
1.
MCS GATE WILL NOT OPERATE.
Step 1.
Check for air leaks throughout vehicle (chassis) air system.
Tighten or replace leaking or damaged air system components (TM 9-2320-363-20).
Step 2.
Check for leaking air hoses, fittings, or valves on MCS tailgate.
Tighten or replace leaking or damaged air hoses and fittings (paragraph 4-59).
Step 3.
Check for leaking or damaged MCS air reservoir.
Replace MCS air reservoir (paragraph 4-55)
Step 4.
Check for leaking or damaged MCS air cylinder.
Replace or repair MCS air cylinder (paragraph 4-56, 4-57. or 4-58).
2.
MCS GATE WILL NOT OPERATE WITH DRIVER’S CONTROLS.
Step 1.
Check for air leaks throughout vehicle (chassis) air system.
Tighten or replace leaking or damaged air system components (TM 9-2320-363-20)
Step 2.
Check MCS tailgate for leaking or damaged air system components
Tighten or replace leaking or damaged components (paragraphs 4-55 thru 4-59).
NOTE
For assistance in troubleshooting an MCS electrical malfunction, refer to wiring diagrams
(paragraph 4-49).
Step 3.
Check MCS fuse for continuity.
Replace damaged fuse (TM 9-2320-363-20).
Step 4.
Check driver’s MCS control unit switches for voltage and continuity.
Replace damaged switches (paragraph 4-42).
Step 5.
Check truck-to-MCS tailgate wiring harness for voltage and continuity.
Repair or replace damaged truck-to-MCS tailgate wiring harness (paragraph 4-47).
Step 6.
Check MCS tailgate wiring harness and air cylinder solenoids for voltage and continuity.
Repair or replace damaged MCS tailgate wiring harness (paragraph 4-48).
Replace damaged MCS air cylinder solenoids (paragraph 4-57).
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