AERIAL DEVICE & UTILITY EQUIPMENT HYDRAULIC SYSTEMS – AD01

1. FUNDAMENTALS OF FLOW & PRESSURE
• What is cylinder force • What is motor torque
• Pump input horsepower
• Fluid power as energy transfer - Pascal’s Law and the Bernoulli Principle
2. RESERVOIRS & FILTRATION
• Seal and fluid compatibilities • Dielectric fluids
• Filter sizing & location
3. THREE BASIC SYSTEMS
• Constant flow systems - fixed displacement pumps
• Constant pressure systems - pressure compensated pumps
• Accumulator/closed center vs. pressure compensated/closed center
4. DIRECTIONAL CONTROL VALVES
• 3 position/4 way • Open center/open port
• 3 position/3 way • Closed center/closed port
• 2 position/4 way • Float position & motor spools
• 2 position/3 way • Power beyond
• Digger/winch servo valves • Open center/closed port
- Altec 900 series and others
5. ELECTRICAL/HYDRAULIC (REMOTE PILOT CONTROL) OR MANUAL BELOW ROTATION OVERRIDE
6. PRESSURE CONTROL VALVES
• Relief valves • Counter balance valves (holding valves)
• Sequence valves • Unloading valves
• Pressure reducing valves • Pilot operated check valves
7. FLOW CONTROL VALVES
• Meter-in, meter-out and bleed off
• Pressure compensated and non-pressure compensated
8. SPECIAL VALVES
• Purge valves • Combination valves
• Selector valves • Dump valves
9. PLUMBING
• SAE hose specification - sizing to reduce pressure drop and heat
• NPT, NPTF, SAE, JIC fittings - straight thread O-ring fittings
• Non-conductive hoses
10. ACTUATORS
• Cylinder & motor selection for force, speed, torque
- GPM - controls speed - PSI - determines force/torque
• Cylinder and motor failure analysis
11. USING SCHEMATICS TO IMPROVE TROUBLESHOOTING TECHNIQUES FOR
• Altec • Asplundh • High Ranger • Holan
• Teco • Telelect • Versal

AUTOMOTIVE TRAINING AUTHORITY

(800) 575-4282

3231 Business Park Dr C231, Vista, CA 92081, USA

©2018 by Automotive Training Authority.