TM 10-4520-259-13&P
5-6. GENERAL INSPECTION INSTRUCTIONS.
a.
General. Perform an inspection of all parts as soon as possible after cleaning. Instructions for specific
inspection procedures are included throughout the maintenance procedures for specific components.
b.
Visual Inspection. Visually inspect all machined and polished areas. Use a strong light to shine across
polished surfaces to inspect for scoring, cracks, breaks, or excessive wear.
c.
Electrical Parts.
(1)
Visually inspect wiring for frayed edges or damaged insulation.
(2)
Inspect all electrical parts such as solenoids, with power applied to observe actual operation.
5-7. GENERAL REPAIR INSTRUCTIONS.
a.
General. Repair the water vessel, skid, and base assembly by removing only the components necessary
to make the repair. The flame safeguard control and wiring, control box assembly, and ignition transformer
are tested or repaired while installed on the water heater. All other components of the water heater
needing repair are removed from the heater at the unit maintenance level. Repair these components,
make the necessary tests to ensure proper performance and return the components to supply for further
use.
b.
Thread Repair. Use the proper size tapping tool to repair tapped holes. Discard and replace all
components that have defective threads.
CAUTION
Do not press on outer race of bearings when installing on shafts.
c.
Press Fit Parts.
(1)
Bearings may require the use of a pneumatic or hand-operated arbor press.
(2)
Preheat all press-fit parts before reassembly. If necessary, use a lubricant to reduce abrasive action.
5-4
