TM 55-4920-414-13&P
Section III. Repainting AND Refinishing INSTRUCTIONS
b. Remove grease, fungus, and ground-in dirt with cloth
dampened with dry-cleaning solvent (item 6, App D).
Observe all cautions and warnings on containers
c. Remove moisture with a dry cloth.
when using consumables. When applicable, wear
necessary protective gear during handling and
use. If a consumable is flammable or explosive,
MAKE CERTAIN consumable and its vapors are
kept away from heat, spark and flame. MAKE
4-7. Repainting and Refinishing instructions.
CERTAIN equipment is properly grounded and
NOTE
firefighting equipment is readily available prior to
use.
Refer to TB 746-10, Field Instructions for Paint-
4-6. Cleaning instructions.
ing and Preserving Electronics Equipment.
a. Remove dust and loose dirt with a clean, low-lint cloth
a. Repaint test set case (exterior) with two coats of yellow
(item 4, App. D).
baked enamel (item 1, App D).
Section IV. MAINTENANCE
4-8. Scope.
The scope of corrective maintenance is the replacement of
lamps and lens, knobs, three-way valves, shut off valve, pres-
sure reducer, SAS pressure switch, thermal relief valve, pilot
assist hydraulic module, male quick-disconnect couplings, and
female quick-disconnect couplings.
4-9. Test Box Maintenance.
4-10. indicator Lamps/Lens Replacement.
a. Make certain POWER DC and AC switches are OFF.
b. Remove lens cover (Figure 4-1).
c. Remove lamp.
d. Install new lamp.
e. Install new lens cover.
4-11. Knob Replacement.
a. Loosen setscrews holding knob to shaft (Figure 4-1).
b. Slide knob off shaft.
c. Place new knob on shaft, making certain knob is fully on
shaft and indexed correctly.
d. Tighten setscrews.
4-12. Test Fixture Maintenance.
4-13. Three-way and Shut-off Valve
Replacement.
To keep dirt from Pilot Assist Hydraulic Module
assembly, make sure Pilot Assist Hydraulic Mod-
ule assembly is clean before maintenance. Replace
three-way valves and shut off valve only in a clean
place. Have replacement valve ready for installa-
tion before malfunctioned valve is removed. It is
not necessary to remove Module assembly from
manifold on Test Fixture.
a. Make certain POWER DC and AC switches are OFF and
hydraulic test stand is off.
b. Disconnect electrical connector from malfunctioned valve.
4-8
