34
HTEC-500
6. Remove the pump wash port connectors. If
your machine was purchased before June
2006, you do not need to use the wrench as
shown in the picture. Instead, you can pull out
the connectors carefully using a set of pliers. In
both cases, these connectors will be used
again.
7. Remove the nuts using an Allen wrench.
8. Pull the pump head mount (made of stainless
steel and held by fingers in the picture below)
straight out after removing all the screws,
being careful not to break or scratch the
piston. Do not lose the back-up ring. This is a
khaki-colored part which supports the piston
seal from the back side of the pump head.
Please do not forget to put back this part
during reassembly. Sometimes, the pump
head mount holds the back-up ring.
9. When you look at the piston you will notice it
has screw threads. To understand the
structure of the piston and how it is mounted
on, please look at your new piston first. Please
insert the piston exchange tool into the hole
on the stainless steel part of the piston (as
shown in the picture) and turn it
counterclockwise. Now you can remove the
piston.
