Blackmer Pump GNX2A

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 the mounting position

Observe start-up and initial operation for issues

Ensure maintenance is performed by qualified technicians only

Follow the appropriate procedures and warnings as presented in the manual

Flush the pump per instructions in the manual

Drain and relieve pressure from the pump and system as required

Remove the head assembly from the outboard (nondrive) side of the pump according to steps 5 - 8 in the 'Pump Disassembly' section of the manual

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 maintenance is performed by qualified technicians only

Ensure pump is not running before lubricating bearings

Check if inboard bearings of GNX(H) models are greased if shipped without gear reducer

Ensure grease relief fittings (76A) are functioning properly after painting

Open the discharge valve and close the intake valve

Bleed air into the pump through the intake gauge plug hole or auxiliary fitting

Pump air for 30 second intervals

Run a system compatible flushing fluid through the pump

Run the flushing fluid for one minute

Repeat initial flushing procedure to remove the flushing fluid