Whirlpool Dishwasher Wash arm Assembly?

Can someone tell me how to remove this WASH Arm assembly ?

I need to check the Chopper due to excesive noise. Theres a small plastic cap on the top but I dont want to break the thing by trying to loosen it.

Here is a link to the arm asssembly Lower washarm parts replacement parts for WHIRLPOOL GU2400XTPQ7 | AppliancePartsPros.com

Thanks

Tom

This may help
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/52521bdbd0ef763c85256cbc00520548/$FILE/8178022.pdf

[quote=denman;144574]This may help
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/52521bdbd0ef763c85256cbc00520548/$FILE/8178022.pdf[/quote]

Thanks. I got it apart and cleared some debree from around the chopper assembly. But when I got it back together its still making the same loud noises. I didnt remove the check valve though while I was in there.

You hay have to pull the motor to check that the bearings/seals/chopper are OK.