Wanner International Hydra-Cell Pump H-25-E

Diaphragm Removal and Inspection

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

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

Remove components from the center of the diaphragm

Inspect diaphragm for damage or wear

Inspect plunger for rough surfaces or edges and smooth as necessary.

Install new diaphragm or reinstall old diaphragm if in good condition, ridge side out.

Clean screw (19) and apply medium-strength threadlocker.

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

Disassemble Pump Housing and Cylinder Housing

Remove pump head and diaphragms as outlined in Fluid-End Service Section.

Remove cap and drain oil from pump housing.

Set hydraulic end of pump face-down on cylinder housing.

Check cam assembly shaft for sharp burrs and smooth any burrs.

Remove four socket head screws and washers that secure cylinder housing to pump housing.

Inspect cam assembly and bearings. Contact Wanner Engineering if bearings are pitted or binding.

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

Ensure you have the necessary tools: 3/8-in (10-mm) hex Allen wrench and 3/16-in (5-mm) hex Allen wrench.

Verify that the pump drive shaft is not turned during the procedure.

Manifold and Valve Plate Removal

Remove all bolts and lockwashers around manifold

Ensure four bolts (26) through back of pump housing are not removed.

Remove centerbolt (1) and washer (2) in center of manifold using 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.