Wanner Engineering Pump G-25-X

Measure the inlet pressure or vacuum with a gauge

Is the vacuum at the pump inlet exceeding 7 in. Hg (180 mm Hg)?

Check the inlet piping system for blockages if vacuum exceeds 7 in. Hg (180 mm Hg)

Check if the pump inlet is located above the supply tank

Replenish the fluid supply if too low

Inlet and Outlet Valve Inspection

Replace worn spring retainer (16)

Replace valve spring (14) if shorter than a new spring

Replace excessively worn valve poppet (13)

Inspect valve seat (12) for wear and replace if necessary

Install new O-ring (11) on valve seat (12)

Clean valve ports and shoulders with emery cloth

Lubricate valve ports and shoulders with lubricating gel or petroleum jelly

Measure the oil level in the upper oil reservoir

Is the oil clean and uncontaminated?

Remove contaminated oil if discovered

Is there any external oil leakage?

Lift the diaphragm by one edge and turn the pump shaft until the diaphragm pulls up.

Insert an Allen wrench through one of the holes to hold the diaphragm up.

Diaphragm Removal and Inspection

Remove the screw (19), O-ring (20), and follower (21) in the center of the diaphragm.

Remove the diaphragm and inspect it carefully for damage.

Inspect the diaphragm for the following issues

Inspect the plunger (23) for any rough surfaces or edges.

Ensure all safety precautions are taken for safe handling of the fluid being pumped.

Provide adequate catch basins for fluid drainage.

Use appropriate plumbing from drain ports when flushing the pump and system with antifreeze.

Shutdown Procedure During Freezing Temperatures

Adjust the discharge pressure regulating valve so the pump runs under minimum pressure.

Open any draincocks in system piping and collect drainage.