Hardi NK MB Series, Instruction Book

Page: 97 / 122

6 - Maintenance
97
Nozzle Tubes and Fittings
Poor sealings are usually caused by:
•
Missing O-rings or gaskets
•
Damaged or incorrectly seated O-rings
•
Dry or deformed O-rings or gaskets
•
Foreign objects
In case of leaks:
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 it
on to the nozzle tube. Use a non-mineral lubricant.
For AXIAL connections, a little mechanical leverage may be used.
For RADIAL connections, only tighten by hand.
Adjustment of 3-Way Valve
The large ball valve (type s93) can be adjusted, if it is too tight to
operate - or if it is too loose (= liquid leakage).
•
Correct setting is when the valve can be operated smoothly by one
hand.
Use a suitable tool and adjust the toothed ring inside the valve as shown
on the drawing.
μ
ATTENTION! The small ball valves (type s67) cannot be adjusted.