59. Primary Drive Chain Excessively Noisy
Probable cause
Possible remedy
Defective chain ................................ ................................ ... Replace chain (para. 594)
Worn sprocket ................................ ................................ .... Replace sprocket (para. 594).
Improper adjustment ................................ .......................... Adjust primary drive chain (para. 196).
60. Crane Hoist Gears Noisy
Probable cause
Possible remedy
Worn gear teeth ................................ ................................ . Replace gear (para. 590-592).
Worn or scored bearings ................................. ................... Replace bearings (para. 590-592).
Bent hoist shaft ................................ ................................ .. Replace hoist shaft (para. 590-592).
61. Crane Swing Gear Noisy or Pulsations in Operations
Probable cause
Possible remedy
Worn gear teeth ................................ ................................ . Replace gear (paras. 606 and 610).
Worn or scored bearings ................................ .................... Replace bearings (paras. 606 and 61 ).
Bent swing shaft ................................ ................................ . Replace swing shaft (para. 610).
62. Crane Boom or Hoist Operation Rough
Probable cause
Possible remedy
Bent drive shaft ................................ ................................ .. Replace drive shaft (paras. 594-596).
Inner boom gear binding ................................ .................... Replace bear bushing (paras. 590-592).
Broken shaft bearings ................................ ........................ Replace shaft bearings (paras. 590-592).
Broken shaft ................................ ................................ ....... Replace shaft (paras. 590-592).
63. Cables Tend to Flatten
Probable cause
Possible remedy
Sheave channel clearance too great ................................ .. Replace sheaves (paras. 204 and 205).
Defective cables ................................ ................................ Replace cables (para. 11).
Incorrect cable size ................................ ............................ Install correct cable (paras. 11 and 12).
64. Revolving Frame Teeters or Will Not Swing
Probable cause
Possible remedy
Conical rollers out of adjustment ................................ ........ Adjust rollers (paras. 199 and 200).
Worn rollers ................................ ................................ ....... Replace hook rollers (paras. 199 and 200).
Swing clutches out of adjustment ................................ ....... Adjust swing clutch (paras. 187-188).
Worn roller shaft ................................ ................................ Replace roller shaft (paras. 199 and 200).
Worn or loose shaft bushing ................................ ............... Replace bushing (paras. 199-200).
Worn or scored bushings ................................ .................... Replace bushings (paras. 199-200).
Defective ring or pinion gears ................................ ............. Replace gears (paras. 610 and 622).
65. Continuous Humming Noise or Noisy Front Axle When Driving
Probable cause
Possible remedy
Wheel bearings too light ................................ ..................... Inspect and adjust wheel bearings (para. 225).
Lack of lubrication or use of improper grade of lubricant
Check lubricant for correct amount and proper grade
in universal joints, wheel bearings, transmission,
as specified in LO 5-3810-227-15.
transfer case.
Broken axle ................................ ................................ ........ Replace axle (paras. 547-549).
Worn or broken differential or pinion gears ......................... Replace gears (paras. 551-553).
Worn or broken differential or pinion bearings..................... Replace bearings (paras. 551-553).
Worn splines on axle shaft ................................ ................. Replace axle shaft (paras. 547-549).
Worn splines on pinion shaft ................................ .............. Replace pinion shaft (paras. 551-553).
66. Steering Assembly Cracks When Turning
Probable cause
Possible remedy
Knuckle bearing rollers and cups scored or worn ................ Inspect and lubricate (LO 6-3810227-15), as necessary.
Wheel bearing rollers and cups scored or worn................... Inspect wheel bearings and replace as necessary (para.
Defective shock absorbers................................ .................. Replace shock absorbers (para. 229).
AGO 6819A 70
