Hydraulic jack plate losing pressure?

[Z21 Tom]

Just installed a Bob's hydraulic jack plate and had it jacked up halfway. When I came back couple hours later it came all the way down.
I jacked it back up half way and I hear small pounding sound very 10 seconds coming from hyd. pump.
Pretty bummed out, any idea what's happening?

[Chisco]

Is the seal on pump leaking? May need to add fluid.

[kadas]

May need to bleed system?

[greg88]

I would definately bleed not being familiar with the newer Bob's if it has power up and down run it up and down a few times each direction should bleed it's self like that otherwise bleed per any instructions from Bob's.

[Z21 Tom]

I will run up and down a few times and see what happens

[alli ss]

Yep bleed it out however bobs says to do. Usually its going to the top or bottom and holding the switch for a few extra seconds and running it to the other end again

[Z21 Tom]

Well got the air out of the system, but still loses pressure slowly. Called Bob's and they said bad check valves or dirty valves. So I have to pull the pump back out of the bilge area clean or replace the check valves. I'm just going to replace to check valves. Not happy but only $15 bucks. So when buying a used hyd. jack plate might be a good idea to replace check valves first and consider it maintenance. The hyd. plate is a 2008 unit.