TESTING & TROUBLESHOOTING

GENERAL

Tests and adjustments should be performed periodically to ensure the power unit is operating at maximum ef- ficiency. Stanley Circuit Tester (part number 04182) is recommended. This tester can be used to isolate prob- lems in both the engine and hydraulic system prior to any power unit disassembly.

TESTING THE HYDRAULIC CIRCUIT

The following tests can be performed to ensure that the hydraulic pump is supplying the correct flow and pres- sure and that the system relief valve is operating prop- erly.

During these tests, make sure the engine is warm and operating smoothly. If test results are not as specified, refer to the troubleshooting table in this section for pos- sible causes.

TESTING THE 5 GPM OR 10 GPM CIRCUIT

To test the circuit, proceed as follows:

1.Set the flow selector switches to the OFF (center) po- sition.

2.Set the throttle control switch to AUTO-OFF position.

3.Connect the Stanley Circuit Tester across two hose ends (where the tool would normally be connected).

4.Fully open the tester restrictor valve (counterclock- wise).

5.Start the engine and allow it to run until warm.

6.Switch the flow selector switch to 5 or 10 gpm de- pending on which flow you are testing.

7.With the engine at the programed speed, the test flow gauge should read 4-6 gpm/15-23 lpm or 9-11 gpm/34- 41.6 lpm.

8.Slowly turn the restrictor valve clockwise while watch- ing the pressure gauge. The flow rate should stay at 4-6 gpm/15-23 lpm or 9-11 gpm/34-41.6 lpm as the pressure gauge reaches 2100-2200 psi/148-155 bar.

9.At 2100-2200 psi/148-155 bar, the relief valve should be- gin to open. The pressure at which the relief valve just be- gins to open is commonly referred to as the "cracking pres- sure". At the "cracking pressure," the flow rate should start to drop because the relief valve is allowing fluid to bypass to the hydraulic reservoir. The "cracking pressure" is preset at the factory and if it is not within the above range, the relief valve must be re-set as follows:

a. The relief valve is located on the right side of the unit just behind the dash panel. It putrudes out from the manifold as- sembly. Use a open end or box end wrench to loosen the nut on the relief valve.

b. Use an Allen wrench to adjust the relief valve. Turn clock- wise to raise the pressure and counterclockwise to reduce the pressure.

c. Tighten the nut and retest.

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Stanley Black & Decker GTR20 user manual Testing & Troubleshooting, General, Testing the Hydraulic Circuit
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GTR20 specifications

The Stanley Black & Decker GTR20 is a versatile and robust tool designed for professionals and DIY enthusiasts alike. Engineered with cutting-edge technology, the GTR20 stands out in the realm of power tools, particularly for those requiring precision and reliability in their projects.

One of the key features of the GTR20 is its powerful motor, which delivers exceptional torque and performance across various applications. This motor enhances the tool's capacity to handle tough materials, making it ideal for both heavy-duty construction tasks and intricate home improvement projects. The ergonomic design adds to user comfort, allowing for extended usage without causing fatigue.

Another significant characteristic of the GTR20 is its advanced battery technology. Equipped with a high-capacity lithium-ion battery, the GTR20 ensures long run times and quick recharge capabilities. This means that users can work for extended periods without the need for constant interruptions, greatly enhancing productivity on the job site. The battery life indicator is a thoughtful addition, providing users with real-time feedback on battery status, thus preventing unexpected shutdowns.

The GTR20 also boasts a sophisticated electronic speed control system, which allows users to adjust the speed according to different materials and tasks. This feature provides greater versatility, enabling more efficient cutting, drilling, or fastening. The tool's variable speed settings cater to various applications, making it a preferred choice for multiple trade professionals.

Durability is another hallmark of the GTR20. Constructed with high-quality materials and designed to withstand demanding conditions, this tool is built to last. The robust casing protects internal components from debris and damage, ensuring longevity even in the toughest environments.

Safety features are also paramount in the GTR20's design. The integrated safety lock and anti-slip grip contribute to user safety, minimizing the risk of accidents during operation. These attributes are essential for maintaining control and ensuring a secure hold, particularly in challenging projects.

Additionally, the GTR20 is compatible with a range of accessories, broadening its functionality. Users can switch between various bits and attachments, allowing for seamless transitions from one task to another.

In summary, the Stanley Black & Decker GTR20 is a high-performance tool that combines power, efficiency, and user-centric design. With its robust motor, advanced battery technology, electronic speed control, and durability, it appeals to a wide audience while meeting the demands of rigorous work environments. Whether tackling professional jobs or embarking on personal projects, the GTR20 is a reliable companion that delivers impressive results every time.
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