TM 5-3895-354-14&P
Section H. GAUGES
78. General
There are four indicating gauges on the hot oil heater. Three are used to indicate conditions regarding the heat
transfer oil. The hot oil pressure gauge and hot oil temperature gauge indicate actual operating pressure and
temperature of the transfer oil. The cold seal tank temperature gauge indicates the temperature of the transfer oil in
the cold seal tank. The fourth indicating gauge, the fuel oil pressure gauge, indicates the pressure of the fuel coming
out of the fuel supply pump. The fifth gauge is the liquid level sight gauge which indicates the liquid level of oil in the
expansion tank.
79. Hot Oil Pressure Gauge, Lines and Fittings
a. Removal.
1. Refer to Fig. 67 and shut off 14 " bar stock valve. Close by turning handle counterclockwise. Do not remove
valve.
2. Remove the hot oil pressure gauge by turning gauge counterclockwise
3.
Remove line from piping tee and bottom of pressuretrol by placing wrench on fittings and turning
counterclockwise. Drain oil into a container. This will be a small amount.
b. Cleaning and Inspection.
1. Clean the hot oil pressure gauge with a cloth dampened with an approved cleaning solvent and dry thoroughly.
2. Clean the bar stock valve body and line to pressuretrol with an approved cleaning solvent and dry thoroughly.
Blow pressuretrol lines clean with compressed air.
3. Inspect the hot oil pressure gauge for cracked or broken glass or dial, defective threads, or other damage.
4. Inspect the line and fittings for cracks, breaks, signs of leakage, res trictions, and damaged threads.
5. Replace all defective parts.
c. Installation.
1. Refer to Fig. 67 and install the hot oil pressure gauge, lines and fittings. Replace in reverse order of removal.
2. Open bar stock valve.
80. Hot Oil Temperature Gauge
a. Removal. Refer to Fig. 67 and locate the hot oil temperature gauge. Remove by attaching wrench to bottom of
gauge and turning gauge counterclockwise.
b. Cleaning and Inspection.
1. Clean the hot oil temperature gauge with a cloth dampened with an approved cleaning solvent.
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