Is it difficult to maintain a pump by ourselves?
It depends, if you are not a tech and just want to try fix the pressure pump, we could purchase a whole set of pump head with motor. It doesn’t require much work, as long as we pin point that it’s the pump which leads to the failure, we can fix the problem by replacing a new set of pump with motor. However, it cost most.
As you may know, the motor seldom goes wrong. The pump head, on the contrary, usually worn out easily. We can tell if the motor working or not by hearing, if the motor vibrates a little and generates a small noise, it’s working fine. Then we just need to replace the pump head.
If we really want to challenge ourselves, we can try fix the pump head by replacing the gear kits. The gear kits worn out and causing the pump fails to work, but it takes some experience to change a new set of gear kit.
L&S CIJ Codification Parts 