It's very easy. Go to the website
http://epfindia.com [i]<link updated to site home></i>, select the State "Maharashtra" in the box, then select the Region/Office code corresponding to your account number MH/................/XXX (it would be mentioned in the area which I have kept blank). Once you click that, the website will lead you to a page where you need to furnish your details in the 3rd and the 5th box (the 3rd box is the area to put your establishment number and the 5th box is the space for putting your own PF Number (it's the xxx in MH/................/XXX which you have mentioned in your note). Fill in your name and mobile number, tick on the "I agree" box (after reading the declaration), and then click on submit.
You will receive the details regarding your PF balance on your mobile number. Try it out and let me know if it works.
Cheers, A.B.