Blackmer Power Pumps GNX(H)4

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

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

Drain the reducer and refill 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 grease relief fittings (76A) for proper function

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

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

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