Blackmer Power Pumps GNX(H)2

Ensure the discharge valve is open

Ensure the intake valve is 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

Repeat the initial flushing process to remove the flushing fluid

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

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 if required

Reattach the R/V cap gasket and cap

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

Ensure no excessive pressure build-up in the gear unit

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 in the gear unit

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

Check if inboard bearings of GNX(H) models are greased if gear reducer was not attached at factory

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