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Page Title:
TACHOMETER/HOURMETER MAINTENANCE. |
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 TM5-4210-224-14&P
4-34. TACHOMETER/HOURMETER MAINTENANCE.
This task covers:
a. Removal
c. Calibrate
b. Installation
INITIAL SET-UP
Tools
Equipment Condition
General Mechanics Tool Kit
Para.
Condition Description
Calibrated Test Gauge
Hose Bed Floors Removed
Hose Rollers Removed
Hose Bin Dividers Removed
Compartment Light Removed
Materials/Parts
Roof Panel Removed
Tachometer/Hourmeter (7AIH-24042)
General Safety Instructions
Engine OFF
Transmission in (N) neutral.
Parking brake and micro-brakelock set.
Batteries disconnected.
REMOVAL
a. Pull socket (1) from tachometer
(2).
b. Remove nuts (4) and lockwashers
(5) from terminals (6). Tag and
remove terminal wires (7) from
back of tachometer (2). Do not
lose round washer (8).
c. Remove nuts (9) and mounting
bracket (10).
INSTALLATION
a. Position mounting bracket (10) and
place tachometer (2) holding
screws through openings in bracket.
b. Insert nuts (9) and tighten firmly.
CALIBRATE
c. Place round washer (8), terminal
a. Position calibrated test gauge to
wires (7), lockwasher (5) and nut
tachometer test port on engine
on terminal and secure.
panel.
d. If necessary, replace bulb (3) in
b. Start engine and check tachometer
socket (1).
against test gauge.
e. Install socket (1) in tachometer
c. Tachometer reading should match
(2).
test gauge. If not matched, ad-
just tachometer accordingly.
4-65
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