That one looks electic. You can take it apart and redo the seals on the inside. I think there are 3 piston like seals and 3 o-rings. The red cap on top hold the oil. They need to be burped. I worked for TruGreen for 5 yrs and have done lots of those pumps! The blue elctric side and the main pump body come apart and that is where the seals are. Check the oil and the seals. The electic motor part of it might be bad.
Pretty easy once you get into it....