Wanner International Hydra-Cell Pump H-25-X

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.

Remove Manifold and Valve Plate

Remove bolts and lockwashers around manifold

Remove centerbolt and washer in center of manifold

Remove manifold and support plate

Inspect manifold for warping or wear around inlet and outlet ports

Remove three socket-head cap screws

Inspect valve plate for warping

Inspect plastic valve plates and manifolds for cracks

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.

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

Ensure all oil and accumulated sediment have drained out

Is the oil viscosity within the acceptable range?

Prime Hydraulic Cells on Standard Pumps

Remove oil cap and fill reservoir with correct Hydra-oil

Use catch basin for oil leaks and dispose of properly

Force air out of oil in hydraulic cell by turning shaft and pumping piston

Wipe excess oil from cylinder housing and diaphragms

Ensure oil is 1 inch (25 mm) from top of fill port

Prime Hydraulic Cells on Kel-Cell Pumps

Method #1 (with system head pressure less than 2 psi)