Wanner Engineering Pump H-25-E

Change the oil according to the guidelines in Hours Between Oil Changes table. When changing, remove the drain plug cap (34) at the bottom of the pump so all oil and accumulated sediment will drain out.

NOTE: Minimum oil viscosity for proper hydraulic end lubrication is 16-20 cST (80-100 SSU).

NOTE: Use of an oil cooler is recommended when process fluid and/or hydraulic end oil exceeds 180°F (82°C) for Metallic Pump Head models or when hydraulic end oil exceeds 180°F (82°C) for Non-Metallic Pump Head models.

CAUTION: Do not turn the drive shaft while the oil reservoir is empty.;

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.

Inspect the diaphragm for the following issues

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

Smooth the surfaces and edges as necessary with emery cloth or a fine file.

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

Is the oil viscosity between 16-20 cST (80-100 SSU)?

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

Measure the oil level in the upper oil reservoir

Is the oil clean and uncontaminated?

Remove contaminated oil if discovered