Blackmer Pump GNX(H)2.5A

Disconnect and lockout electrical power or engine drive before maintenance

Relieve system pressure before maintenance

Flush and decontaminate system if pumping hazardous or toxic fluids

Ensure pump is not running before lubrication

Remove the grease relief fittings (76A) from the bearing covers (27, 27A)

Slowly apply grease with a hand gun until grease begins to escape from the grease relief fitting port (76)

Ensure the discharge valve is open

Ensure the intake valve is closed

Run the pump with the discharge valve open and the intake valve closed

Bleed air into the pump through the intake gauge plug hole or through a larger auxiliary fitting in the intake piping

Pump air for 30 second intervals to clean out most of the pumpage

Run a system compatible flushing fluid through the pump for one minute to clear out the remainder of the original pumpage

Relief Valve Setting and Adjustment

Ensure safety precautions are in place

Remove the relief valve cap and gasket

Loosen the locknut, if equipped

Turn the adjusting screw inward, or clockwise

Inspect the R/V cap gasket and replace as required

Reattach the R/V cap gasket and cap

Check for a vent on the gear unit and remove the sealing plug if applicable

Remove all anti-corrosive metal protectant from bare metal surfaces

Drain the reducer and refill it with the proper type and amount of lubricant

Check the lubricant level and type to ensure the gear unit is filled correctly based on mounting position

Observe start-up and initial operation for issues

Replace disturbed or removed O-rings

Heat PTFE O-rings in hot water before installation

Mechanical Seal Inspection and Replacement

Is there excessive leakage from the tell-tale hole in the bearing cover?

Has the mechanical seal been leaking?

Replace the entire mechanical seal if leakage is detected

Refer to 'General Pump Troubleshooting' for possible causes of seal leakage