HOUR METER
TM 9-4940-568-20
2-197
Table 2-21. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CRANE HOUR METER IS INOPERATIVE
1. CRANE HOUR METER DOES NOT WORK.
NOTE
Make sure the FRS 24 VDC electrical system is functioning properly.
Crane MAIN POWER switch must be in the ON position for hour meter to work.
Test 1.
Loosen four screws and clamps and open crane junction box cover. Check for 24
VDC between black wire connector on hour meter and a known good ground.
If voltage is present, check for continuity between green wire connector on back of
hour meter and a known good ground. If continuity is not found, repair or replace
green wire from hour meter to power ground terminal strip. If continuity is found,
replace hour meter. Refer to paragraph 5-4 in this manual.
If no voltage is found, go to Test 2.
Test 2.
Check for 24 VDC between terminal strip position 5 and a known good ground.
If voltage is present, repair or replace black wire from terminal strip position 5 and
hour meter. Refer to paragraph 3-16 in this manual.
If no voltage is found, replace overland shutdown relay. Refer to paragraph 5-4 in
this manual.
