# Hydraulic Schematic First Read

Learn a first-pass method for reading hydraulic schematics: source, actuator, valve, flow path, pressure limit, and safe stop.

## Outcome
Explain what a basic hydraulic circuit is trying to do before touching equipment.

## Safe first step
Identify the energy source and stored-energy hazards before tracing the circuit.

## Ladder steps
### 1. Find the source
Start with pump, tank, and pressure supply.

Check: You can point to where energy enters the circuit.

### 2. Find the actuator
Cylinder or motor motion is usually the visible work.

Check: You can name what moves and in which direction.

### 3. Trace valve states
Valves change flow paths.

Check: You can explain normal, actuated, and blocked paths.

### 4. Find pressure protection
Relief and checks affect safety and failure behavior.

Check: You can identify where pressure is limited or trapped.

## Examples
### Read a directional valve flow path
```sh
Trace P to A and B to T
```
Expected signal: Pressure and return paths are identified

### Predict actuator direction
```sh
Mark cylinder extend and retract ports
```
Expected signal: Movement matches the active flow path

### Find pressure protection
```sh
Locate relief valve symbol
```
Expected signal: A pressure limit path returns to tank

## Common traps
- Treating a schematic like a wiring diagram.
- Ignoring stored pressure.
- Changing valves before understanding the current state.

## Practice task
On a simple cylinder circuit drawing, mark pump, tank, valve, actuator, relief, extend path, and retract path.

## Next steps
- Learn common hydraulic symbols.
- Learn pressure vs flow.
- Learn lockout and stored energy basics.

## Related
- [Electronics first checks](/learn/microcontroller-wiring-first-checks/)