Powewasher drive belt

I have one of the belt drive washers they sell on wcr. The belts went out today, and for the life of me can’t get the first two on. I can’t find a way to release tension. Is there a trick or something I’m missing ?

Sorry I was posting from my phone and it kept saying connection lost. Didn’t think it posted

Try loosening the pump, it should slide to get belt on

Just replaced on a landa cold water machine. I had to loosen the 4 bolts under the motor and there were 2 tension bolts on the side of the frame. I had to remove the oil fill plug to allow the motor to get close enough to the pump.