6 - Maintenance
6.10
Drain valve seal replacement
If the main tank drain valve leaks, the seal and seat can be changed the
following way.
€
DANGER! Do not enter the inside of the tank - the parts can be
changed from the outside of the tank!
±
WARNING! Use eye / face protection mask when dismantling the
tank drain valve!
1. Make sure the tank is empty and clean.
2. The valve must be closed and the string loose.
3. Pull out the clip (A) and pull down connecting piece
(B). The entire valve assembly can now be pulled out.
4. Check cord and valve flap assembly (C) for wear, replace seal (D) and assemble again.
5. Assemble the valve assembly again using a new valve seat (E). Lubricate O-rings (F) before assembly.
6. Fit clip (A) again.
ATTENTION! Check function of valve with clean water before filling chemicals into the tank.
Nozzle tubes and fittings
Poor seals are usually caused by:
• Missing O-rings or gaskets
• Damaged or incorrectly seated O-rings
• Dry or deformed O-rings or gaskets
• Foreign bodies
In case of le
aks:
DO NOT overtighten. Disassemble, check condition and position of O-
ring or gasket. Clean, lubricate and reassemble.
The O-ring must be lubricated ALL THE WAY AROUND before fitting on
to the nozzle tube. Use non-mineral lubri
cant.
For AXIAL connections, a little mechanical leverage may be used.
For RADIAL connections only hand-tighten them.
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