The Industrial Hydraulics Handbook
The Mobile Hydraulics Handbook by Brendan Casey
The Hydraulic Troubleshooting Handbook by Brendan Casey
The Hydraulic Maintenance Handbook by Brendan Casey
Insider Secrets to Hydraulics 2nd edition by Brendan Casey
Industrial Hydraulic Control by Peter Rohner
Preventing Hydraulic Failures by Brendan Casey
Pneumatic Control for Industrial Automation by Peter Rohner
Relay and PLC Logic For Hydraulic Technicians
Hydraulic Load Sensing Control: Everything You Need To Know
How To Read Hydraulic Schematics
How To Select the Correct Hydraulic Oil
The Hydraulic Troubleshooting App is a nifty tool to keep on your phone or tablet, so you can refer to it when needed. And you will need it at some point, that's for sure.
It's FREE. And it's available for download now from Google Play and Apple's App Store. So get yours today.