TM 5-3810-231-12
53. Hoist Shaft Gears Noisy
Probable cause
Possible remedy
Worn gear teeth ................................ ............................... Report to direct support maintenance.
Worn or scored bearing ................................ .................... Report to direct support maintenance.
Bent shaft ................................ ................................ ......... Report to direct support maintenance.
54. Crane Boom or Hoist Operation Rough
Probable cause
Possible remedy
Broken shaft ................................ ................................ ..... Report to direct support maintenance.
Worn or defective shaft bearings ................................ ...... Report to direct support maintenance.
Defective clutches ................................ ............................ Replace or repair clutch (para. 115).
55. Cables Tend to Flatten
Probable cause
Possible remedy
Sheave channel clearance too great ................................ Replace sheaves (para. 142-146).
Defective cables ................................ .............................. Replace cables (para. 42).
Incorrect cable size ................................ .......................... Install correct cable (para. 4).
56. Revolving Frame Teeters or Will Not Swing
Probable cause
Possible remedy
Hook rollers out of adjustment ................................ .......... Adjust rollers (para. 110).
Worn rollers ................................ ................................ ..... Replace hook rollers. Report to direct support maintenance.
Swing clutch out of adjustment ................................ ......... Adjust swing clutch (para. 116).
Worn roller shaft ................................ .............................. Replace roller shaft. Report to direct support maintenance.
Worn or loose roller bushing ................................ ............. Replace bushings. Report to direct support maintenance.
56A. Machine Fails to Swing in Either Direction
Probable cause
Possible remedy
Circuit breaker tripped ................................ ...................... Remove cover from control cabinet and reset circuit breaker
With engine "off" check for open circuit In regulator coil circuit.
Remove all leads from terminal "C" (fig. 3) on the regulator.
At terminal "C" to "D" on regulator reading with ohmmeter
should be about 37 to 45 ohms. If not replace voltage
regulator plug-in unit (para. 150).
Remove leads from terminal "A" (fig. 3) on voltage regulator
chassis. Reading measure from terminal "A" to "B" should
be 40 ohms. If not replace regulator plug-in unit (para. 150).
Alternator field open or shorted ................................ ........ Check continuity of alternator field with an ohmmeter.
disconnect the leads at the alternator field terminals.
Reading should be 23 to 25 ohms.
If not replace brushes and clean slip-rings (para. 116). If
trouble persists repair or replace the crane alternator (para.
Crane alternator belts loose or broken .............................. Adjust or replace belts (para. 39 and 96).
56B. Machine Fails To Swing in One Direction But is Normal in Other Direction
Probable cause
Possible remedy
Moveable contacts in the controller "R" or "L" (fig. 3)
not making contact with the stationary contact .................. Replace badly burned or worn contacts (para. 149).
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