Occasional Maintenance; Safety Valve Activation - Hardi NK SB Series Instruction Book

6 - Maintenance

Occasional Maintenance

General Info
The maintenance and service intervals for the following components will depend very much on the conditions under which
the sprayer is operated, and therefore it is almost impossible to specify the intervals.
The operator must select appropriate intervals for the occasional maintenance. If in doubt, contact your local HARDI dealer.

Safety Valve Activation

To make the fluid system work perfectly over time, it is good practice to regularly provoke opening of the safety valve. This
is good practice for all sprayers; particularly for sprayers without optional equipment.
This prevents clogging and ensures proper function of the safety valve. Depending on valve system opening of the safety
valve is done as follows:
No Rinse Tank (no 3-way valves)
1. Close the main spray ON/OFF valve.
2. Engage pump at 540 rpm.
With Rinse Tank
1. Close the main spray ON/OFF valve.
2. Turn the suction valve to "Suction from Main Tank" and close the Agitation valve.
3. Engage pump at 540 rpm.
4. Turn the pressure valve to "Spraying".
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DANGER! BK operating unit together with Rinse Tank only: The pressure valve must not be closed when the pump is
running! Doing so causes a risk of contamination and injury from a pressure hose being "shot" off when pressurized!
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