MAINTENANCE MANUAL
Mirage technical manual
page 27 of 65
Grease wands and check play between nut and ball
The ball shaped end of the steam and hot water wands is in direct contact with the conical nut and
should therefore be lubricated. The conical nut is made from bronze for that reason but still needs a
little grease every now and then. If not lubricated, the steel ball will erode the bronze nut and
eventually the wand may
“pop out” of the nut.
As long as the steam valve is kept closed and no hot water is dipensed, the machine can remain
operational. When the conical nut is removed, you may just as well grease the O-rings on the brass
plunger that presses against the ball.
Materials needed
Spanner, 22 mm
Heat resistant, food safe, grease
Loctite
Teflon O-ring between conical nut and valve, red silicone O-ring against ball, Viton O-rings on
valve plunger when necessary
Figure M 11. Use 22 mm spanner to loosen conical nut on steam valve (or hot water fitting). The rag is
used to prevent scratching.
Procedure
1. Make sure that valve is closed and valve temperature is such that it can be firmly gripped.
2. Turn conical valve nut with spanner 22 mm counter-clockwise to remove (see Figure M 11).
Beware that a spring inside the valve pushes a plunger against the ball end of the wand. Take the
plunger and spring out as well. A Teflon sealing O-ring will probably remain on the valve (or hot
water fitting).
3. Clean the threads on the valve, do not damage the Teflon O-ring.
4. When removed, slide the nut a little over the wand towards the tip. A (red) silicone O-ring inside
will be pushed out of the nut.
5. Apply grease to both sides of the ball end of the wand and a very small amount to the silicone O-
ring, the rounded end of, and the two Viton O-rings (replace when necessary) on, the brass
plunger in the valve (see Figure M 12).
6. Slide the spring and plunger back into the valve.
7. Slide the nut back over the wand, insert the red silicone O-ring (replace when necessary).
8. Replace the Teflon O-ring when necessary.
