TM 5-3825-229-14&P
4-11. CONTROL PANEL GAUGES
THIS TASK COVERS:
a.
Testing Tachometer
d.
Removal of Ammeter
b.
Testing Ammeter
e.
Installation of Tachometer
c.
Removal of Tachometer
f.
Installation of Ammeter
INITIAL SETUP:
Tools Required:
Equipment Materials Required:
Nomenclature:
Tags (Item 14, Appendix E)
General Mechanics
Equipment Conditions:
Tool Kit
Ref
Conditions
4-22
Battery cables disconnected
WARNING
Electrical shock hazard exists. Disconnect battery cables (para. 4-22).
a. Testing Tachometer.
(1)
Connect a calibrated 0-3000 RPM tachometer to the engine per the instructions supplied with
the tachometer.
(2)
Place remote control box having tachometer next to reference tachometer for comparison.
(3)
Reconnect battery cables.
(4)
Run engine at idle speed, 1,000 RPM and 2,000 RPM. If control box tachometer and reference
tachometer read identically at all three speeds, tachometer is good.
(5)
If control box tachometer reads different RPM than reference tachometer, the control box
tachometer must be adjusted or replaced.
(6)
Unscrew two screws on right side of panel. Open panel.
(7)
Adjust calibration potentiometer on back of control box tachometer and test again. If several
adjustments do not correct reading, replace control box tachometer.
4-17
