Autool PT650 | Transmission Oil Pressure Tester
Warranty directly via AsTools
Warranty directly via AsTools
We handle warranty cases ourselves, quickly and without involving the manufacturer. Thanks to our own parts inventory and technical expertise, we can usually assist you immediately. Only in exceptional cases do we still send the product to the supplier.
2 years warranty on all products
2 years warranty on all products
All our products come with a 2-year factory warranty. This ensures you long-lasting quality and service.
Easy returns
Easy returns
You can easily request your return through your account. We will send you the return label by email. Return shipping costs are your responsibility.
Professional customer service
Professional customer service
Our experts are ready to help you quickly and professionally, both online and in our physical store. Questions? Feel free to contact us!
The Autool PT650 is a digital transmission fluid pressure tester for automatic transmissions with a measurement range of 0 to 29.4 bar. The PT650 measures oil pressure in an automatic transmission at the main pressure port of the gearbox housing. When a transmission shudders or slips, this measurement tells you whether the pump and control system deliver the pressure they should – saving you from opening the gearbox to investigate.
The device displays readings digitally and records the maximum and minimum values during measurement, along with the difference between them and the duration of the test. Connection is made using the supplied adapters: twelve adapter types. With the thread sizes found on automatic gearboxes: NPT 1/4″ and 3/8″, 1/8″-28 internal and external thread, M8×1.0 and M10×1.0, plus an oil-resistant extension hose.
KEY BENEFITS
POINTS TO NOTE
Application and functionality
An automatic transmission controls its clutches hydraulically. If the gearbox shudders or slips, the question is whether the pump and pressure regulator achieve the specified pressure. The PT650 measures that pressure at the main oil pressure port, with the engine running and in different gears, so you can compare the measured value against the manufacturer's pressure chart.
Because you shift during measurement, the tester must capture the peak values for each gear. These functions are included:
- Live reading: The pressure at that moment.
- Highest and lowest values: Pmax and Pmin are held throughout the measurement.
- Difference between them: ΔP, the difference between the highest and lowest value.
- Measurement time: How long the measurement has been running.
- Transmission adapters: NPT and 1/8″-28 thread sizes not typically found on engine blocks.
Where to connect it
The main oil pressure port. Located on the automatic gearbox housing; which adapter you need depends on the make.
How to perform the measurement
The sequence determines whether the measurement is worthwhile. This is the procedure Autool prescribes in the manual.
- Bring the transmission to operating temperature: Cold ATF produces different pressure than fluid at operating temperature.
- Remove the main pressure port plug: Unscrew the plug from the housing and thread in the matching adapter.
- Connect the tester: Position the hose so it stays clear of the exhaust and drivetrain.
- Run the engine and select gears: Read the pressure in different positions; Pmax, Pmin and the difference are recorded.
Where to use it
This measurement applies to faults where shift quality is a concern:
- Gearbox shifts harshly or late: Whether the control pressure in that gear meets what the chart specifies.
- Gearbox slips under load: Whether the pump maintains pressure as torque increases.
- After an automatic transmission fluid change: Verification that the level and pressure are correct.
- Before deciding to overhaul the gearbox: A pressure test is cheaper than dismantling.
Which pressure gauge you need
Autool offers seven pressure testers that look similar externally but have different sensors and adapter sets. The difference lies in which system you're measuring and how high the pressure rises in that system. You're currently viewing the PT650.
| Model | What it measures | Range | Adapters |
|---|---|---|---|
| PT520 | Air pressure and vacuum | −100 to +200 kPa | Seven adapter types |
| PT530 | Air pressure and vacuum | −100 to +300 kPa | Seven adapter types, with sizes from 4 to 20 mm |
| PT610 | Compression pressure of a petrol engine | 0 to 29.4 bar | Ten adapter types |
| PT620 | Engine oil pressure | 0 to 29.4 bar | Eighteen adapter types |
| PT630 | Fuel pressure in the low-pressure line | 0 to 29.4 bar | Comprehensive set with tapered nipples and hose couplings |
| PT640 GDI | Fuel pressure in a direct injection system | 0 to 360 bar | Three adapter types |
| PT650 (this product) | Oil pressure in an automatic transmission | 0 to 29.4 bar | Twelve adapter types |
Package contents
- 1x Autool PT650 transmission oil pressure tester
- 1x Adapter set: Twelve adapter types
- 1x Carry case
- 1x User manual
Technical specifications
| Specification | Description |
|---|---|
| Brand | Autool |
| Model | PT650 |
| Type | Transmission oil pressure tester |
| Measurement range | 0 to 29.4 bar (426.6 psi / 30 kg/cm²) |
| Accuracy | 0.5% of full scale |
| Resolution | 0.01 bar |
| Overload limit | 40 bar |
| Display | Digital display |
| Adapters | Twelve adapter types |
| Case | Included |
| Power supply | Four AAA batteries of 1.5 V |
| Operating temperature | −10 °C to +60 °C |
| Dimensions | 175 × 72 × 29 mm |
| Auto shut-off | After five minutes |
| Article number | PT650 |
