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Unit 11
Repairs and maintenance
3131
10.2 Troubleshooting procedures (1)
NATURE OF PROBLEM ASSUMED CAUSE CORRECTION
BACKLASH IN OUTPUT SHAFT
Small amount along perimeter
of cam
Insufficient preload between cam
and cam follower
Adjust eccentric flange on input shaft
Large amount on certain
part(s) of cam
Cam flaking
Replace cams, reduce load on output
shaft
Large amount on certain
part(s) of turret
Cam follower flaking
Replace turret, reduce load on output
shaft
Large amount at one place on
turret
Crack in outer diameter of cam
follower
Replace turret, attach torque limiter on
output shaft
Large amount at one place on
turret
Damaged cam follower
Replace turret, attach torque limiter to
output shaft
Changes every index
Eccentric wear on outer diameter
of cam follower
Replace turret, increase oil viscosity by
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
directions
Worn bearings Check sealing device and lubrication
Play in thrust and radial
directions
Loose tightening nut
Tighten nut, review load in thrust
direction
Play in thrust and radial
directions
Creep wear on shaft
Enlarge tightening length, review
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
directions
Bearing has gap in thrust direction
Tighten flange on inside of eccentric
flange
Play in thrust and radial
directions
Worn bearings Improve lubrication sealing device
Play in thrust and radial
directions
Creep wear on shaft
Enlarge tightening length, review
ambient temperatures
NOISE
Loud noises, continuous Noise from lip section of oil seal Supply lubricant, replace sealing device
Loud continuous noise caused
by vibration.
Noise from entire unit
Check Servo Tuning section in Yaskawa
Drive manual, of contact Sankyo
America for assistance.
Loud noises, intermittent
Roughly machined cam track
surface
Correct cam, increase viscosity of
lubricating oil
Loud noise, intermittent
Rotating components touch each
other
Check mounted component
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