Kozo K-27 Axle Driven Pump

A few parts to start the construction of the axle driven pump. The cylinder will form the vertical column of the pump. The flat brass will be the eccentric strap that connects the eccentric to the pump plunger. The pin will connect the strap to the pump plunger. December 18, 2022.

The brass piece is the horizontal section of the axle pump. The shiny piece is the pump plunger made of 303 stainless that has been polished. December 26, 2022.

These are the three main parts of the axle pump body that will be soldered together before further machining can occur. December 27, 2022.

A small  bushing that will be used to attach the pump outlet water line which will feed the boiler. December 27, 2022.

The four brass components after soldering and cleaning up in an acid bath. There will be lots of lath work to come to machine the three legs and then the small piece behind the mounting plate will be cut off. December 27, 2022.

The upper fitting will fit at the bottom of the pump and attach the water supply line. The lower fitting will cap off the top of the pump to hold in the spring and ball for the check valve. December 28, 2022.

The 1/16" carbide cutters came in so the slot in the pump plunger was cut. There is also a cross drilled hole to attach the eccentric strap. December 30, 2022.

The eccentric strap is still bolted to the fixture that was mounted in the lathe chuck to bore the hole (about 1.5" diameter). The outer profile will need to be machined next. December 31, 2022.

The completed eccentric strap for the pump that will be driven off of the eccentric on axle three. January 1, 2023.

All of the legs of the axle driven pump have been finished to size. Each of them required drilling and boring operations with two of them having threads. Jan 7, 2023.

The phosphor bronze bushing for the pump plunger. Jan 8, 2023.

The axle pump components prior to being installed on the K-27. A total of ten individual pieces that had to be machined. A custom bit was also made to cut the check valve seat in the top leg of the pump. January 8, 2023.

The axle pump is bolted to the frame member just behind driver set four and is driven by the eccentric on driver set three. January 8, 2023.