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Troubleshooting FAQ
This information may also be found in the General Service Manual

SYMPTOMS

  • Indexer is inaccurate.
  • Looseness in one dwell,
  • Looseness in each dwell.
  • Indexer is noisy.
  • Premature wear on cam followers.
  • Output is erratic and vibrating.


    INDEXER IS INACCURATE

    1. Check if unit stops in dwell. Generally, the center of dwell is on the opposite side of the input shaft from the cam. (See also "Cam & Limit Switch Functions" in the General Service Manual.) These drawings show the keyway location in the middle of the dwell period for the three types of indexers:
      ROLLER GEAR:
      Roller Gear dwell location
      RIGHT ANGLE:
      Right Angle dwell location
      PARALLEL: Parallel dwell location
    2. Is the output shaft backlash-free? Be sure to disconnect all other devices from the indexer output including a CAMCO overload clutch. All indexers must be backlash-free in dwell (See Looseness in one dwell and Looseness in each dwell.)
    3. How is the unit being checked? We use a computer controlled checking machine which checks each index against the theoretically perfect index. Contact Camco for assistance. We keep inpspection reports for Special Accuracy units (units which are required to be within closer tolerances than standard).

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    LOOSENESS IN ONE DWELL (ONE OUTPUT POSITION)

    1. Followers are worn and need replacing
    2. Follower wheel is damaged and needs rework or replacement

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    LOOSENESS IN EACH DWELL (ALL OUTPUT POSITIONS)

    1. Camshaft is loose in bearings. Check for endplay in input shaft. Adjust shims on bearings caps. See individual unit service manuals for preload setting procedures.
    2. Cam is loose on shaft. Usually repaired at Camco.
    3. Cam is broken. (This happens very seldom and is an indication of an overloaded application or a jam-up).
    4. Unit was very heavily overloaded and all bearings loosened up. Rework required
    5. All followers are worn. Rebuilding by factory is best remedy.
    6. Output shaft to follower wheel connection is loose. Factory repair is recommended.
    7. Customer output member connection is loose. Tighten output member and dowel in place.

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    INDEXER IS NOISY

    1. Check if output is backlash free in dwell.
    2. Check for excess looseness in motion. Cam or follower could be broken
    3. Is indexer noisy or could it be the reducer?
    4. Very often, variable speed DC controls cause the input to pulsate and create noise. Adjust the Internal Resistance Compensation within the control.
    5. Are input and output connections backlash free?
    6. Is the unit overloaded? Loads can change over a period of time due to wear.
    7. Is the unit support (base) rigid?
    8. The unit could be overheated and have loose preload.
    9. Is the unit filled with oil? Is oil used consistent with Camco specifications? See Indexer Oil Spec Sheet.

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    PREMATURE WEAR ON CAM FOLLOWERS

    1. Actual forces on the unit could be greater than calculated due to loose input or output.
    2. Lack of oil or wrong oil used. See the Indexer Oil Spec Sheet.
    3. Frequent or severe overloads.
    4. Improper input systems (where there is not a constant velocity input) will cause an erratic output or excessive output vibration. This will result in forces several times higher than calculated (see input recommendations).

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    OUTPUT MOVEMENT IS ERRATIC AND VIBRATING

    1. Input does not run at a constant velocity. The prime objective of a good input connection to an Index Drive is to maintain a constant shock-free velocity (see input recommendations). Motor running too slow could also cause an erractic input.
    2. Output connections are loose, flexing, or winding up. Check all connections (see recommended output connections).
    3. Excessive friction drag on output. Disconnect indexer and investigate friction torque.
    4. Unit is overloaded due to excessive speeds or loads. Contact your local Camco Sales Representative and check data sheet application loads and speeds. Decrease speed.
    5. Unit could be internally damaged. Check other symptoms.
    6. Unit support is not rigid. Check ridigity of index drive mount with indicator. Stiffen support or decrease speed.

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    Commercial Cam Co., Inc (CAMCO)
    1444 South Wolf Road · Wheeling, IL 60090
    Toll Free: 1-800-645-5207 · Phone: 847-459-5200 · Fax: 847-459-3064
    www.camcoindex.com · camco@destaco.com