2010 850xp awd - Polaris ATV Forum
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post #1 of 14 (permalink) Old 05-22-2019, 02:42 PM Thread Starter
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2010 850xp awd

Hey all, I'm new to Polais. Have had Artic cat's and can ams.
Anyway I got a problem with my AWD. Some times it works and sometimes it does not. I have a 3 position switch, 2wd, 4wd and 4wd hill assist. It only works occasionally in the 4wd hill assist.
Anyone out there with some ideas on possible issues that would be causing this?
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post #2 of 14 (permalink) Old 05-22-2019, 04:11 PM
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Originally Posted by [email protected] View Post
Hey all, I'm new to Polais. Have had Artic cat's and can ams.
Anyway I got a problem with my AWD. Some times it works and sometimes it does not. I have a 3 position switch, 2wd, 4wd and 4wd hill assist. It only works occasionally in the 4wd hill assist.
Anyone out there with some ideas on possible issues that would be causing this?
Dirty fluid and/or worn parts.
When have you changed the housing fluid?
When has the ADC fluid been changed and the system bled?
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post #3 of 14 (permalink) Old 05-22-2019, 04:12 PM
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If used much it needs change every 50 hrs. or less.
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post #4 of 14 (permalink) Old 05-23-2019, 03:10 AM Thread Starter
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I replaced all the fluids last week, front dif, trans, engine oil, Rear dif and break fluids.
Starting to think it's a electrical issue.
I'll play around with that before I pull the front dif and check for wear
post #5 of 14 (permalink) Old 05-23-2019, 07:08 AM
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Originally Posted by [email protected] View Post
I replaced all the fluids last week, front dif, trans, engine oil, Rear dif and break fluids.
Starting to think it's a electrical issue.
I'll play around with that before I pull the front dif and check for wear
Im sure someone else with more Knowledge will chime in here but, I have seen other Post's on this subject and you might want to check the Wiring in the Switch box as well as the Fuse's. I always start simple then head to the what could be a major fix.

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post #6 of 14 (permalink) Old 05-23-2019, 07:27 AM Thread Starter
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Quote:
Originally Posted by [email protected] View Post
I replaced all the fluids last week, front dif, trans, engine oil, Rear dif and break fluids.
Starting to think it's a electrical issue.
I'll play around with that before I pull the front dif and check for wear
Im sure someone else with more Knowledge will chime in here but, I have seen other Post's on this subject and you might want to check the Wiring in the Switch box as well as the Fuse's. I always start simple then head to the what could be a major fix.

Welcome!
thanks, hope so. I checked the fuses already. I started playing with the wiring last night from the switch to by the battery. tonight ill start at the diff and go up
post #7 of 14 (permalink) Old 05-23-2019, 08:39 AM
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What did the front diff. oil look like and how long had it been BEFORE last week? If really bad it may have to be changed several times to get it clean.
Did you also change the ADC oil? and bleed the ADC system?
Those early model ADC diffs are prone to failure and clutch pack wear if used often.
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post #8 of 14 (permalink) Old 05-23-2019, 12:41 PM Thread Starter
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What did the front diff. oil look like and how long had it been BEFORE last week? If really bad it may have to be changed several times to get it clean.
Did you also change the ADC oil? and bleed the ADC system?
Those early model ADC diffs are prone to failure and clutch pack wear if used often.
Front diff Oil was black but not mikey,
The rear was a bit milkey though.
I bought it used so not sure, the guy said it was recently serviced but who knows
And yes I changed and bleed the ADC oil, this looked pretty good during the change. I only bleed from 1 of the bleeder screws. Should I bleed from both?
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post #9 of 14 (permalink) Old 05-23-2019, 06:07 PM
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Yes you should bleed both bleeder screws. I had an intermittent problem with my awd on my 2010 850. Ended up being the sprague cage internal to the diff. The cage is plastic in the later model 2010s. The top sheared off.

I would at least inspect the wiring going into the front diff to make sure nothing is frayed or shorted to the case.
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post #10 of 14 (permalink) Old 05-23-2019, 06:08 PM
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Yes you should bleed both bleeder screws. I had an intermittent problem with my awd on my 2010 850. Ended up being the sprague cage internal to the diff. The cage is plastic in the later model 2010s. The top sheared off.

I would at least inspect the wiring going into the front diff to make sure nothing is frayed or shorted to the case.
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