Wanner Engineering Pump H-25-I

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.

Measure the oil level in the upper oil reservoir

Is the oil clean and uncontaminated?

Remove contaminated oil if present

Ensure the pump is turned off and cooled down

Gather necessary tools and materials for oil change

Remove the drain plug cap (34) at the bottom of the pump

Allow all oil and accumulated sediment to drain out

Measure the inlet pressure or vacuum with a gauge

Does the vacuum at the pump inlet exceed 7 in. Hg (180 mm Hg)?

If vacuum exceeds 7 in. Hg (180 mm Hg)

Check the inlet piping system for blockages

If the pump inlet is located above the supply tank

Is the fluid supply level too low?

Replenish the fluid supply if too low

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.