TM 55-1930-209-14&P-13 Table 2-2.  Bridge Crane Troubleshooting Condition Possible Cause Suggested Action 1 Crane does not operate when a Power panel 1 circuit a Close (ON) circuit breaker hand-held control buttons are breaker 6P5 open pressed (OFF) b Loose connection b Tighten connector or replace or damaged wiring damaged wiring c Electrical collectors worn c Replace collectors or adjust as or out of alignment required d Hand-held control d Replace hand-held control malfunctioning e Crane gearbox drive e Replace drive shaft shaft sheared f Crane drive wheels f Inspect drive wheels for warps slipping on "I" beam and foreign matter  Replace warped wheels and/or clean or remove foreign matter from "I" beam, as necessary 2 Bridge crane chatters or hums Brake improperly Troubleshoot brake assembly adjusted or worn in accordance with excessively manufacturer's instruction manual (Dings Co.) No BK4613, 60 3 Trolley hoist hook difficult to a Load to be hoisted a Reduce load to hoist capacity lower or raise exceeds hoist capacity b Hoist up-down chains b Straighten chain  Inspect for kinked or twisted damage c Hoist not properly c Lubricate in accordance with lubricated instructions in manufacturer's manual d Hoist internal brake has d Inspect and adjust brake as excessive clearance required e Load chain binding e Inspect chain for proper lubrication Lubricate chain as required 4 Trolley hoist makes scuffing a Rails worn or severely a Inspect rails Determine sound when rolling along rails pitted condition and repair as required b Trolley wheels improperly b Check trolley wheels for proper installed or worn installation and wear  Adjust or excessively repair as required 2-19