QED Environmental Systems Oil Pump AP4.0

Remove the bottom “spider” casting by unthreading it from the discharge tube.

Visually inspect the fluid discharge pipe for scale build-up or debris.

Visually inspect the float that slides up and down on the discharge tube for scale build-up or debris.

Remove the float from the discharge tube by removing the small steel hairpin from the bottom spring cup.

Clean the fluid discharge tube using a damp cloth. If necessary, soak the discharge tube in vinegar or use scour pads made for non-stick cookware.

Clean both the internal and external surfaces of the float using a damp cloth. If necessary, soak the float in vinegar or use scour pads made for non-stick cookware.

Remove the float end plates to ease cleaning. After cleaning, replace the plates on the same end of the float from which they came.

Clean the white plastic square control rod using an abrasive pad or a razor or utility knife.

Clean the outer casing using a three-stone honing tool. Move the hone in and out a half dozen times or so, through each end of the casing.

Disconnect the air supply from the pump

Remove the bolt at the bottom of the pump which holds the inlet screen in place (bottom loading pumps only)

Remove the three bolts at the bottom of the pump which hold the inlet in place

Remove the inlet from the pump’s casing by pulling it out

Twist and slide the casing down off the pump’s frame