Maintenance of a Pump Head with Seal Wash

Place the pump head on a flat surface. Loosen the lock screw (two turns).

While holding the lower half of the assembly (piston housing), carefully pull the pump housing away from the piston housing.

Remove the seal holder and the seal wash support rings from the piston housing.

Remove the seal holder from the support ring assembly.

Lift the housing away from the pistons.

Check the piston surface and remove any deposits or layers: clean the piston surface with abrasive paper and rinse with 2-propanol. Replace piston if scratched.

Using the steel side of the insert tool, carefully remove the seal from the pump housing.

Using the plastic side of the insert tool, insert new seals into the pump head.

Using the steel side of the insert tool, remove the seal wash gasket and the wash seal from the support ring.

Using the plastic side of the insert tool, press the new wash seal (spring pointing upwards) into the recess of the support ring.

Place a seal wash gasket in the recess of the support ring. Use a matching orientation of gasket and support ring. Put the seal holder on top of the gasket.

Place the support rings on the piston housing. Note the correct position of the pins on the support ring.

Place the pump housing onto the piston housing.

Insert the pistons and carefully press them into the seals.

Tighten the lock screw.

Install the pump head, see Reinstall the Pump Head Assembly.