MAINTENANCE MANUAL
Speedster
page 31
Procedure
1.
Close water mains to machine.
2.
Put brewing lever in middle position to depressurise the coffee water system.
3.
Turn machine “off” and brewing lever in upper position.
4.
Remove left and right side panels first and then upper body panel.
5.
Unscrew outer nut from expansion valve with a 16 mm spanner. Retain expansion
valve with 21 mm spanner. Let drain hose with short copper tube and nut dangle
to side.
6.
Remove outer part of expansion valve with 21 mm spanner. Retain expansion
valve with suitable spanner since outer part of expansion valve is sealed with
Loctite. Inside you will find a set screw, spring and plunger, the sealing disk is
mounted in the plunger (see figure 18).
Figure 18. Exploded view of expansion valve showing plunger, spring set screw, and
replacement sealing disk. There is no need to remove the expansion valve from the
machine when replacing the disk.
7.
Clean threads on expansion valve and inside the outer part.
8.
Carefully remove sealing disk from plunger with small screw driver, do not
damage the plunger.
9.
Put a little silicon grease on both plunger and sealing disk.
10.
Mount sealing disk back on plunger, make sure that you push out possible air
between plunger and disk.
11.
Mount plunger and spring back into the expansion valve (disk inwards).
12.
Apply a few drops of Loctite to the threads of the expansion valve (or a few
windings of Teflon tape).
13.
Screw outer part back on the expansion valve, retain the valve with a suitable
spanner.
14.
Adjust opening pressure of expansion valve (see previous paragraph).
15.
Re-mount the hose to expansion valve. Wiggle the tube a little when fastening the
nut, do not over-tighten the nut.
16.
Re-mount upper body panel first, then side panels.
17.
Open water mains to machine.
plunger
set screw
replacement
sealing disk
clean
threads
clean
threads
