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