TM 55-1930-209-14&P-13
2-16.4.1 Cleaning and inspection
a.
Make sure bridge crane assembly is electrically dead by opening (OFF) power panel 1 circuit breaker 6P5.
If one of the bridge cranes must be operational, open (OFF) and secure circuit breaker 6P5 and disconnect
voltage input cable at crane reel of bridge crane to be repaired. Then close (ON) circuit breaker 6P5 so
other bridge crane is operational.
b.
Wipe clean, except electrical components, with soapy damp cloth or remove grease with solvent.
c.
Wipe exterior of electrical components clean with cloth. Use vacuum cleaner or electrician’s brush to
clean inside of electrical components. Avoid using solvent to clean inside of motor controller.
d.
Visually inspect rails, jib rails, and other structural components for loose connections and securement.
Repair, replace, and/or tighten as necessary.
e.
Visually inspect rail components for loose connections, wear, damage, corrosion, and chipped or worn
paint. Remove rust and corrosion by wire brushing, chipping, or scraping. Immediately paint area with zinc
chromate primer and finish to match surrounding area in accordance with TB 43-0144. Do not paint
threads or labels.
f.
Visually inspect all stops and tighten bolts if required.
g.
Visually inspect drive tires for wear and slippage. If necessary, adjust all spring mounts uniformly at each
drive wheel.
h.
Visually inspect and test interlocks for alignment, proper clearances, and freedom of operation.
i.
Visually inspect electrical components for indications of burns, corrosion, loose connections, damaged
parts, or chipped paint. Clean corrosion from contacts or terminals, tighten loose connections, and replace
damaged parts. Clean electrical components with silver polish, fine sandpaper, or burnishing tool. DO
NOT use emery paper or steel wool. Vacuum to remove residue. Touch up paint according to TB 43-
0144. Do not paint threads or labels.
2-16.4.2 Testing
2-16.4.2.1 Load proof and function test and safety inspection. Perform and record an annual load proof and
function test and safety inspection of bridge crane assembly including jib rail, in accordance with TB 43-0144. All load
carrying members must be visually inspected upon completion of the load proof and function test for wear and cracks. If
visual inspection of painted members indicates possibility of cracks, perform the magnaflux or other accepted method to
find cracks not visible to the eye.
2-16.4.2.2 Electrical test and repair
WARNING
Shut down bridge crane system before attempting maintenance. Be sure to open (OFF) circuit
breaker 6P5 on power panel 1. Red tag circuit breaker with: “WARNING - DO NOT ACTIVATE.
REPAIRS BEING MADE.” If one of the bridge crane assemblies must be operational, disconnect
junction box-to-cable reel cable terminals at junction box to shut off electrical power to cable
reel.
a.
With circuit breaker 6P5 at power panel 1 closed (ON), check bridge crane input line voltage at junction
box (JP1) terminal pair A1 and A2, A1 and A3, and A2 and A3 for 440 Vac. If voltage across any terminal
pair is not 440 Vac, go to step b. If voltage across all terminal pairs is 440 Vac, go to step c.
b.
Check circuit breaker 6P5 output voltage across all three terminal pairs for 440 Vac. If voltage across any
terminal pair is not 440 Vac, circuit breaker or power source is at fault. If voltage across all terminal pairs
is 440 Vac, repair or replace power cable to circuit breaker 6P5 to junction box.
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