Milton Roy Dosing Pump GB60 (PP)

Unscrew the ball guide (424) from the liquid end

Remove and discard the O-Rings (419)

Carefully clean any parts to be reused

Do you suspect that the check valve may be damaged or worn?

Replace the entire check valve assembly if damage or wear is suspected

Ensure all shut-off valves are closed and all pressure has been bled from liquid end.

Drain oil from the pump by unscrewing the drain plug (20) and O-Ring (19).

Set the stroke adjusting knob to 100%.

Disconnect the suction and discharge piping.

Unscrew the six diaphragm head bolts.

Remove the diaphragm head assembly from the pump body.

Turn the motor fan by hand until the end of the diaphragm assembly (261) is fully forward, and unscrew the diaphragm from the connecting rod (60).

Drop the ball into the curved inner chamber end of the ball guide.

Place a new gasket on the rim of the ball guide, and sit the seat on top of the ball guide, trapping the ball and gasket between the seat and ball guide.

Position the connection (435) onto the correct end of the ball guide with a gasket trapped between the two metal surfaces.

Position the check valve assembly onto the liquid end, trapping a gasket between the two metal surfaces. (Seat and pump head).

Slide the valve clamp (437) over the connection (435) and screw into the liquid end using the three screws (441,442) and their split washers (439).

Unscrew the ball guide (424) from the liquid end

Screw the union nut part way onto the end of the ball guide

Sit the ball guide/union nut onto a flat surface with the union nut down

Insert a thin, blunt instrument into the small center hole

Tap screwdriver gently with a hammer until the ball and seat are released from the ball guide

Carefully remove the O-Rings from the ball guide and seat

Carefully clean any parts to be reused

Ensure all shut-off valves are closed and all pressure is bled from the liquid end.

Disassembly (Refer to Figures 7 and 8)

Set the stroke adjusting knob to 100%.

Disconnect the suction and discharge piping.

Unscrew the six diaphragm head bolts.

Remove the diaphragm head assembly from the pump body.

Turn the motor fan by hand until the end of the diaphragm assembly is fully forward, and unscrew the diaphragm assembly from the connecting rod.

Reassembly (Refer to Figures 7 and 8)