If the pump motor sped and slowed down while up and down ---sort of like when you block a vacuum cleaner and the motor speeds up---you must have gotten air in the suction side of the pump---how? Don't know. Apparently air has displaced the oil and that extra volume had to go somewhere--out the vent.


My dump trailer uses one pump to drive one cylinder and has only power up or one-way (single) actuation.

Is your reservoir on the end of the pump or is it separate? Look fr a loose fitting or fitment which may where the air may be entering (if I'm correct).

Side bar: I removed the trailer hitch jack and replaced it with a single acting hydraulic cylinder with spring return and a valve. Now I can attach and unattach the trailer in seconds.

Anywho, an alternate diagnosis may be your pump may be shot (dirt got in the system) and is cavitating which may also create air in the system.

A new pump will run in the mid-to high $200.

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