hydraulic leak on a Z20E

[dumper]

Put it on the deck get it looked at by someone who knows cherry pickers 

[doobin]

Sounds like a sensor or pump pressure issue if it works fine with no load. 
 

be careful with the sight glass. Once they get old and crazed they can be very hard to read. If you’ve put three gallons into it with no visible change on the sight glass then there’s a fair chance it’s overfilled and the problem lies elsewhere. 
 

What symptoms do you get when you are in it and it refuses to lift any further?

Edited August 1, 2021 by doobin

[Conor Wright]

Make, model etc would help. Or a picture. As stated above, dont trust the glass eye.

An older machine could have a knackered seal/ cracked hose/blocked valve/ worn out pump? Something newer could have a sensor issue, has it got outriggers? load sensing valve? 

If you dont know what you're at I'd get someone qualified to look at it. You dont want to end up taking the quick route to the ground.

You need to give better information to have a hope of getting a correct answer.