Wanner International Hydra-Cell Pump G-25-S

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

Install new or reinstall old diaphragm

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

Measure the oil level in the upper oil reservoir

Is the oil condition acceptable?

Is the oil contaminated or discolored?

Remove contaminated oil from the pump housing

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.

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)

Install valve plate without outlet valves and tighten screws

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.

Refill reservoir. If oil appears milky, repeat flushing procedure until oil appears clean.