My guess is you just need a new seal kit. In your case it looks like an internal type of seal and I would suggest the viton type, better with heat and chemicals than buna. If you are using the pump for high temperatures like knock out, whirlpool and cip, then you are lucky to get 1 year out of a seal set. We always kept an extra set around. We recently replaced our pump with one that has an external seal as the manufacturer thought it would withstand the temperature better. Hope this helps.