TM 9-2320-362-14&P
Table 3-2.
Unit Troubleshooting (Cont’d)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
HOURMETER IS NOT FUNCTIONING
Step 1.
Start engine (TM 9-2320-280-10) and let engine come to
normal idle speed of 650 RPM (± 25 RPM).
Step 2.
Check hourmeter after 6 minutes.
If hourmeter advances 1/10 of an hour, procedure is
completed.
If hourmeter fails to advance 1/10 of an hour, go to
step 3.
Step 3.
Remove tach/hourmeter box cover.
Check hourmeter leads
for tight connections.
Tighten leads as necessary.
Replace tach/hourmeter
box cover and repeat Step 2.
If hourmeter fails to advance 1/10 of an hour, replace
hourmeter (para 3-19).
END OF TESTING
4.
WITH PARKING BRAKE NOT SET, PARKING BRAKE DASH LIGHT IS OFF, AND STATUS
INDICATOR ALARM AND LIGHT DO NOT COME ON (REFER TO FIGURES 3-1 THRU 3-
3)
NOTE
l
When measuring voltage, measure against ground.
l
When measuring +28 VDC, use ± 2 VDC for tolerance.
Step 1.
Disconnect cable W64 from connector 12J1 on tach/
hourmeter box.
Step 2.
Using multimeter, measure voltage at connector 12J1,
pin
" G " ,
on tach/hourmeter
If multimeter displays
If multimeter does NOT
step 5.
box. -
about +28 VDC, go to step 3.
display about +28 VDC, go to
3-13
