I don't have a 1315, but I guess I would start and check all the lift arms - see if they're bent, assembled properly, ensuring they're all attached (are there any missing pins), etc. Next, be sure the pulley itself is correct and that it's not wobbling or loose. Check any springs. Like I said, I don't have a 1315 or any of that series. Sorry I can't be of more help.
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