TM 5-3895-379-23-1
0035
MALFUNCTION
Wire 440-RD To Vibration Per Minute (VPM) Tachometer Faulty.
CORRECTIVE ACTION
NOTE
Wire 440 (part of instrument wiring harness) becomes wire 440-RD (part of main
wiring harness) at connector (R1/P1).
1.
Remove two shoulder screws, washers, and vandal guard from box assembly.
2.
Remove three screws and washers and lift box assembly up from operator station.
3.
Start engine and turn vibratory system on for not more than 10 seconds (TM 5-3895-379-10).
4.
Touch positive (+) probe of multimeter to terminal S (440-WH) of VPM tachometer.
5.
Touch negative (-) probe of multimeter to good ground.
6.
Multimeter should measure minimum of 2.4 VAC peaks.
7.
Turn engine start switch to OFF position (TM 5-3895-379-10).
If minimum 2.4 VAC peaks are not measured at terminal S (wire 440-WH), repair or replace
wire 440-WH/440-RD and connectors from VPM tachometer to speed sensor (WP 0195).
MALFUNCTION
No Power To Vibration Per Minute (VPM) Tachometer.
CORRECTIVE ACTION
1.
Set multimeter to measure VDC.
2.
Turn engine start switch to ON position (TM 5-3895-379-10).
3.
Touch positive (+) probe of multimeter to terminal + (wire 123-WH) of VPM tachometer.
4.
Touch negative (-) probe of multimeter to good ground.
a.
If 24 to 28 VDC are not measured at terminal + (wire 123-WH) and GAUGES fuse is good,
repair or replace wiring and connectors to GAUGES fuse holder (WP 0195).
b.
If 24 to 28 VDC are present at terminal + (wire 123-WH), replace VPM tachometer
0035-4
03/15/2011Rel(1.8)root(tswp)wpno(T00041)