Blackmer Power Pumps GNX(H)3

Open the discharge valve and close the intake valve

Bleed air into the pump through the intake gauge plug hole or a larger 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

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 (clockwise)

Inspect the R/V cap gasket and replace if required

Reattach the R/V cap gasket and cap

Disconnect and lockout electrical power or engine drive before maintenance

Relieve system pressure before performing pump service or maintenance

Flush and decontaminate system if pumping hazardous or toxic fluids

Ensure grease relief fittings (76A) are functioning properly

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

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

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

Ensure sealed vents are activated to prevent excessive pressure build-up

Remove all anti-corrosive metal protectant from bare metal surfaces

Refill the reducer 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

Flush the pump per instructions in this 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 this manual

Remove the head capscrews (21) and gently pry the head away from the cylinder