Sankyo 11AR manual Troubleshooting procedures, Play in Output Shaft

			Unit 11
			Repairs and maintenance
	10.2 Troubleshooting procedures (1)
	NATURE OF PROBLEM	ASSUMED CAUSE	CORRECTION
BACKLASH IN OUTPUT SHAFT
	Small amount along perimeter	Insufficient preload between cam	Adjust eccentric flange on input shaft
	of cam	and cam follower
	Large amount on certain	Cam flaking	Replace cams, reduce load on output
	part(s) of cam		shaft
	Large amount on certain	Cam follower flaking	Replace turret, reduce load on output
	part(s) of turret		shaft
	Large amount at one place on	Crack in outer diameter of cam	Replace turret, attach torque limiter on
	turret	follower	output shaft
	Large amount at one place on	Damaged cam follower	Replace turret, attach torque limiter to
	turret		output shaft
	Changes every index	Eccentric wear on outer diameter	Replace turret, increase oil viscosity by
		of cam follower	one grade
PLAY IN OUTPUT SHAFT
	Play in thrust direction only	Loose output flange	Apply loctite to screw threads and
			re-tighten
	Play in thrust and radial	Worn bearings	Check sealing device and lubrication
	directions
	Play in thrust and radial	Loose tightening nut	Tighten nut, review load in thrust
	directions		direction
	Play in thrust and radial	Creep wear on shaft	Enlarge tightening length, review
	directions		ambient temperatures
PLAY IN INPUT SHAFT
	Play in thrust direction only	Insufficient preload on bearings	Tighten flange on inside of eccentric
			flange
	Play in thrust and radial	Bearing has gap in thrust direction	Tighten flange on inside of eccentric
	directions		flange
	Play in thrust and radial	Worn bearings	Improve lubrication sealing device
	directions
	Play in thrust and radial	Creep wear on shaft	Enlarge tightening length, review
	directions		ambient temperatures
NOISE
	Loud noises, continuous	Noise from lip section of oil seal	Supply lubricant, replace sealing device
	Loud continuous noise caused		Check Servo Tuning section in Yaskawa
		Noise from entire unit	Drive manual, of contact Sankyo
	by vibration.
			America for assistance.
	Loud noises, intermittent	Roughly machined cam track	Correct cam, increase viscosity of
		surface	lubricating oil
	Loud noise, intermittent	Rotating components touch each	Check mounted component
		other
	Low noise, continuous	Worn input shaft bearings	Replace bearings, check lubrication
	Low noise, intermittent	Cam flaking	Replace cams, reduce load on output
			shaft
	Low noise, intermittent	Cam follower flaking	Replace turret, reduce load on output
			shaft
	Low noise, Intermittent	Loose rotating components	Check tightening section of mounted
			components

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