Can chlorine damage my pool pump?

Welcome to TFP! If your water is balanced properly with a decent FC-to-CYA ratio as noted on the FC/CYA Levels chart, chlorine is not the issue. If anything, a low pH can make the water very corrosive which can be problematic. That looks like your shaft seal failed allowing water to pass from the pump pot area to the dry (motor) side resulting in corrosion. That could've been a manufacturing defect and out of your control.

If you are still curious about your water chemistry and/or potential impact on pool equipment, I would encourage you to post a full set of water test results. We'll be happy to look them over.

SS,

That is not due to chlorine and your pool company is full of bull feathers.

It appears that you had a shaft seal leak and that led to water getting into the motor section.

Did you notice that under the pump is a slot where water is supposed to drain out when the seal leaks. Did you ever notice a pool of water under your pump?

Thanks,

Jim R.