GH5650 Mechanical Fuel Meter Manual

Manual applies to 1" 1.5" and 2" GH5650 meters 

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About This Manual

This manual is designed to provide you with comprehensive guidance on the installation, operation, and maintenance of your new GH5650 meter. Should you have any questions or require further assistance, please do not hesitate to contact our customer support team at service@walstonindustrial.com or (415) 710-4396. For additional resources and updates, visit our website: www.walstonindustrial.com.

Safety Information

WARNING: This product should not be used to transfer fluids into any type of aircraft.
WARNING: This product is not suited for use with fluids intended for human consumption or fluids containing water.

1. NEVER smoke near the meter, or use the meter near open flames when metering a flammable liquid! Fire can result!

2. Threaded pipe joints and connections should be sealed with the appropriate sealant or sealant tape to minimize leaks.

3. Storage tanks should be securely anchored to prevent shifting or tipping when full or empty.

4. To minimize static electricity, use only static wire conductive hose when metering flammable fluids, and keep the fill nozzle in contact with the container during the filling process.

5. DO NOT exceed 50 psi / 3.5 BAR line pressure.

6. DO NOT install additional foot valve or check valve without a pressure relief valve; cracking may result.

Installation

The meters are furnished for horizontal piping; left-to-right flow. Flow ports can be changed to any of four positions for horizontal or vertical piping and for either direction of flow. By unscrewing the 4 bolts on the back, take care—the meter chamber assembly may become exposed.

- Determine direction for fluid to flow.

- Install meter observing directional arrow on casting.

Maintenance

Your Walston Industrial GH5650 Meter should operate virtually maintenance-free. However, certain liquids can dry out inside the meter housing, causing the meter to stop or perform poorly. If this happens, clean the meter thoroughly.

Fluid Compatibility

The GH5650 Meter can be used with the following fuels: Diesel, Gasoline, Kerosene, Mineral Spirits, Heptane, and Hexane.
Meter should NOT be used with the following substances: Bleach, Ink, Hydrochloric Acid, Sulfuric Acid, or Salt Water.

Warranty

This product is backed by a 1-year limited warranty covering defects in materials and workmanship. Warranty does not cover labor, misuse, or damage caused by improper installation. For more warranty details, visit www.walstonindustrial.com.

Calibration Procedure

1. Fill a known-volume container (e.g., certified 5-gallon jug). Note GH5650 reading.

2. If the meter reads high (over-registering) or low (under-registering), locate and remove the CAL screw cap on the side.

3. Turn the screw clockwise to lower the reading or counterclockwise to raise the reading—adjust in 1/8 turns.

4. Repeat test and adjust as needed.

5. Re-cap calibration screw and record calibration date.

Assembly and Disassembly

1. Detach the reset knob by gripping and pulling it away from the body.

2. Unscrew the two fasteners securing the top and bottom of the front bezel, then lift off the bezel.

3. Unscrew the two fasteners to remove the counter face, then remove the internal counter unit.

4. Remove the four fasteners to separate the meter chamber halves.

5. To disassemble the gear train and seal: remove gear frame bolts, slide out gear cluster, washers, shaft, drive gear, and O-ring.

6. Reassemble by reversing these steps, lightly coating the O-ring with oil before reinstalling.

Contact Information

Email: service@walstonindustrial.com
Phone: (415) 710-4396
Website: www.walstonindustrial.com