Disassembling the Powerhead

Loosen the swivel retaining bolts.
Remove the swivel.
Position the oil ports over a suitable container.
Pull the piston rod out until it stops.
Push the piston rod back.
The oil from the tool runs out through the ports.
Remove the endcap screws and the endcap.
Pull the piston rod out until it stops. Clamp the piston rod end in a vice.
Loosen the piston rod end with a socket and extension bar. Unscrew the piston rod end.
Withdraw the piston from the housing bore.