Cletrac BD help

[merlin]

Hello to all. I am knew to the forum and need some help. I am looking at an unknown year Cletrac BD dozer. Looks to be in pretty good shape and the seller says it runs and works. He did say that a couple of the injectors leak as does the hydraulic pump. How difficult/expensive would these items be to fix? I have small parcel and would use it for clearing fences and smaller work like that. I plan to look at it this weekend and would like to be armed with knowledge. I will try to attach a photo. Thanks in advance for the help.