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Old 03-21-2009, 03:32 AM   #1
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Default filling diffs up with oil, locking up????? HELP

would filling up the diffs with oil all the way to the rim of the cup, then bolting down the top until bolts are tight, would that cause the diff to lock up?? whats the proper way to do this? (filling diffs up with oil) thanks
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Old 03-21-2009, 03:55 AM   #2
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I have always been told that you do not fill them up anymore than half way or, just over the top of the cross pins.
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Old 03-21-2009, 06:28 AM   #3
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You might check and make sure you have the flat spots in the pins lined up together correctly.

If you don't and you tighten everything down it will make the diff feel "locked"... because the gears are actually bound up.
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Old 03-21-2009, 06:47 AM   #4
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You might check and make sure you have the flat spots in the pins lined up together correctly.

If you don't and you tighten everything down it will make the diff feel "locked"... because the gears are actually bound up.
yeh i checked that, i was just asking coz when it had no oil its fine, but when i filled it with oil, it was locked up.
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Old 03-21-2009, 07:35 AM   #5
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Filling it to the rim with oil will not lock up the diff. Be sure the sun gears are fully seated on there shafts. My Losi diffs have this problem. Once fully seated the diffs work fine. Took a while to figure out what was causing the problem. The gear was only about .010" from seated, but it made a huge differance. I could feel and see that the shaft was not seated quite as far as the other side. Still can't belive that the pressure of tightening the case didn't seat the gear.
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Old 03-21-2009, 05:38 PM   #6
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Filling it to the rim with oil will not lock up the diff. Be sure the sun gears are fully seated on there shafts. My Losi diffs have this problem. Once fully seated the diffs work fine. Took a while to figure out what was causing the problem. The gear was only about .010" from seated, but it made a huge differance. I could feel and see that the shaft was not seated quite as far as the other side. Still can't belive that the pressure of tightening the case didn't seat the gear.
ohh ok, i will check this again then

thanks for all your replys

this is my truggys front diff btw
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Old 03-21-2009, 06:55 PM   #7
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are you by chance using the HD diffs.....If so there is a Specific way to install the pin retainer's....the 90degree edge to the outside of the case....the warning that goes with the cases stated the diffs can and will lock up if you install the plates backwards......this might be the issue.
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