TM 5-3740-214-14
CONTROL PANEL MAINTENANCE (Continued)
(g) While holding the meter tube, complete the removal of the tube retainers and/or tube retainer and
control valve.
(h) Remove the meter tube from the meter frame and pull the tube caps from each end.
(i) From the outlet end of the meter tube, carefully remove the end plug from the tube. Depending
upon the selection of seal materials, this end plug may be either one solid part or a plug with an "O" ring. In either case,
inspect the parts for nicks or cuts that could be the possible source of a leak.
(j) With the tube in the vertical position, remove the outlet float stop. Then, with one hand over the top
of the tube, invert the meter to remove the ball float. Put the float aside so that it will not be damaged.
(k) From the inlet end of the meter tube, remove the end plug (as in step i) and the inlet float stop.
c. Clean flowmeter components. Clean insecticide from flowmeter components with hot soap and water such as
MIL-D-16791E. Clean electrical components with a lint free cloth dampened in dry cleaning solvent Federal
Specification P-D-680.
d. Inspect and test control panel components.
(1) Inspection. Check hoses for kinking, chafing, or cracking. Check hoses and fittings for leaks. Check
electrical insulation for cracks or chafing. Replace any damaged components.
(2) Testing.
(a) Thermometer. Place the thermometer in a glass of ice water with a calibrated thermometer. Check
the calibrated thermometer against the panel thermometer. If the temperature varies 10%, replace the panel
thermometer.
(b) Nozzle pressure gage. Check the panel gage against a calibrated gage. If the pressures vary more
than 2 psi, replace the panel gage.
(c) Flow meter. See calibration procedures in Chapter 2, Section III. If the flow meter is incorrect,
replace the meter tube.
e. Assemble and install flowmeter.
(1) Insert float ball in meter tube.
(2) Insert inlet and outlet float stops.
(3) Insert end plugs.
(4) Attach tube caps.
(5) Set meter tube in meter frame and tighten setscrews.
(6) Secure flowmeter spacer to meter frame with screw.
(7) Attach pointer to flowmeter.
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