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(1) This is how I set up the indicator to check the
backlash.
(Click on picture to see MPEG movie about 450K) |
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| (2) There was 10 thousandths and 6 tenths of backlash that was there after about 1 year on driving on the 4:75 gears |
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| I used a brush and lightly coated the pinion with Dykem Blue (high-spot blue) |
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| I used red lead on the ring gear |
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(3) After rotation back and forth this is what I got |
Click here to see a MPEG movie on how I got this pattern (about 1.1 meg) |
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| (4) Here is the pattern on the other side |
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| (5) Why is there a difference in the pattern from one side to the other? |
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| Mark each cap with a center punch (blue marks are for detail because they may get washed off when cleaning) |
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| Stone all mating surfaces with a sharpening stone soaked with WD-40 |
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| Without stoning the mating surface this would have been a high spot an the bearing cap may have worked loose |
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| Stone the caps also |
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| (5) I used a depth caliper to determine the pinion depth from the bearing half to the top of the pinion. |
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| (6) The pinion height was 3.003 inch (well maybe 3.0009) |
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| The pinion gear had some abrasion marks. Looks like some bearing particles have embedded into the gear |