Blackmer Pump GNX(H)2A

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 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)

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 it with the proper type and amount of lubricant

Check the lubricant level and type in the gear unit

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

Turn the shaft by hand until a vane comes to the top (12 o'clock) position of the rotor; Remove the vane

Install a new vane, ensuring that the rounded edge is UP, and the relief grooves are facing towards the direction of rotation; See Figure 4

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 and note them here