Blackmer Power Pumps GNX(H)2.5

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

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)

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

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

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