b. Cleaning, Inspection, and Repair.
(1) Refer to figure 3-83, tag and disconnect
two electrical leads, remove two screws securing switch
(1) Clean all metal parts with an approved
to overspeed governor, then remove microswitch.
cleaning solvent and dry thoroughly.
(2) Install in reverse order.
(2) Visually inspect light for damage or
b. Cleaning, Inspection, and Test.
defect. Check that lamp is not burned out. Inspect red
lense for cracks or breaks.
(1) Clean microswitch with a soft cloth
(3) Repair by replacing a burned out lamp.
dampened in an approved cleaning solvent and dry
Replace a light that is defective or when lens is broken.
thoroughly.
(2) Visually inspect for corroded terminals
and damaged or weak arm contact.
3-152. Fuel Level Indicator
(3) Use a multimeter and test between
a. Removal and Installation (Model 855BG-2).
normally open and normally closed contacts for
(1) Refer to figure 3-128 and remove fuel
continuity. If continuity is shown, switch is defective and
level indicator.
must be replaced. Replace a damaged or defective
(2) Install in reverse order.
microswitch.
b. Cleaning, Inspection, and Repair.
(1) Clean indicator with a clean cloth
3-149. Ammeter
dampened in an approved cleaning solvent and dry
a. Removal and Installation.
thoroughly.
(1) Refer to figure 3-128 and remove the
(2) Visually inspect indicator for dents, broken
ammeter.
glass, or other damage. Inspect mounting hardware for
(2) Install in reverse order.
burs, stripped threads, or other defect. Inspect electrical
b. Cleaning, Inspection, and Test.
leads for fraying insulation, broken wire, or loose
terminals. Check indicator for operation in conjunction
(1) Clean ammeter with a soft cloth
with transmitter (para 3-153).
dampened in an approved cleaning solvent and dry
(3) Repair by replacing defective indicator,
thoroughly.
mounting hardware, or electrical lead.
(2) Visually inspect ammeter for corroded
c. Removal and Installation (Model 855BG-3).
terminals, cracked glass, and other damage or defect.
(3) Use a multimeter and check across
(1) Refer to figure 3-58, perform steps 3 and
terminals for continuity.
Replace a damaged or
4 and remove fuel level gage.
defective ammeter.
(2) Clean in an approved cleaning solvent
and dry thoroughly.
(3) Check that movement of float through its
3-150. Oil Pressure Indicator
arc gives a true indication of full or empty at limits of
a. Removal and Installation.
travel. Replace a defective fuel level gage.
(1) Refer to figure 3-128 and remove the oil
(4) Install by reversing procedure in (1)
pressure indicator.
above.
(2) Install in reverse order.
b. Cleaning and Inspection.
3-153. Transmitter Fuel Level
(1) Clean oil pressure indicator with a soft
(Not on Model 855BG-3)
cloth dampened in ,an approved cleaning solvent, and
dry thoroughly.
(2) Visually inspect indicator for broken glass
and remove fuel level transmitter. Install in reverse
or other damage. Inspect transmitter leads for good
order.
terminal connections at indicator. If transmitter checks
b. Cleaning, Inspection, and Repair.
out (para 3-90) but indicator does not operate, return to
(1) Clean transmitter in an approved cleaning
direct support for calibration.
solvent and dry thoroughly.
(3) Replace a defective oil pressure indicator
(2) Use a multimeter set on low ohm scale
or damaged mounting hardware.
across terminals then move float through arc to full
position. During float travel multimeter should indicate
3-151. Indicator (Warning) Light, Low Oil Pressure
increasing ohms. When increasing ohms are indicated,
a. Removal and Installation.
install electrical lead then check position of pointer on
indicator with position of float relative to distance
(1) Refer to figure 3-129 and remove the low
traveled.
oil pressure indicator (warning) light.
(2) Install in reverse order.
3-138
