Front Wheel not touching Idler wheel

Hello, how do you adjust the wheels on a Polaris 280. On the side where there are 3 wheels the back wheel is touching the idler but the front wheel on the drive shaft is not. Is there a way to adjust the idler or front wheel so that there is contact? Went to Leslie pools and they want to charge $250 advising that I need new wheels and bearings. Not sure why I need wheels as they are not worn. I know how to change the bearings but not how to adjust the wheels.

Thanks,
 
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