Wanner International Hydra-Cell Pump G-25-E

Check 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

Check the fluid supply level if the pump inlet is above the supply tank

Replenish fluid supply if too low

Refer to the 'Shutdown Procedure' for freezing protection

Shutdown Procedure During Freezing Temperatures

Adjust the discharge pressure regulating valve to minimum pressure and stop the pump

Ensure you have a 3/8-in (10-mm) hex Allen wrench and a 3/16-in (5-mm) hex Allen wrench available.

Verify that the pump drive shaft is not turned while the manifold and valve plate are off, except when removing diaphragms or repriming the hydraulic cells.

Manifold and Valve Plate Removal

Remove all bolts and lockwashers around manifold

Do not remove four bolts (26) installed through back of pump housing (30).

Remove centerbolt (1) and washer (2) in center of manifold using a 3/8-in (10-mm) hex Allen wrench.

Remove manifold (7) and support plate (43, used on non-metallic pump only).

Inspect manifold for warping or wear around inlet and outlet ports.

Valve Plate and Manifold Installation

Install valve assemblies in valve plate (18)

Install valve plate (18) on cylinder housing (25) with three cap screws (39)

Reinstall O-rings (8, 9, and 10) between valve plate and manifold (7)

Reinstall manifold (7) onto valve plate (18)

Insert all bolts (5), washers (6), and nuts (31) around edge of manifold, and centerbolt (1) with washer (2). Hand tighten.

Torque Specifications for Model H-25

Alternately tighten opposite bolts (5) until all are secure

Measure the oil level in the upper oil reservoir

Is the oil condition acceptable?

Is the oil contaminated or discolored?

Remove contaminated oil if present

Flush Contaminant from Hydraulic End

Remove oil drain cap (34) and allow all oil and contaminants to drain out. Replace oil drain cap.

Remove oil cap (28) and fill reservoir with kerosene or solvent, manually turn pump shaft to circulate kerosene, and drain.

Repeat the kerosene or solvent flush.

Fill reservoir with fresh oil, manually turn pump shaft to circulate oil, and drain once again.

Is the oil milky after refilling the reservoir?

Repeat flushing procedure until oil appears clean, if necessary.