Cone Check/Replacement For Pressure Regulation Valve - Hardi NAVIGATOR 3000 Instruction Book

6 - Maintenance
Pump valves and diaphragms replacement
Model 1303 pumps:
Diaphragm pump overhaul kit (valves, seals, diaphragms etc.) can be
ordered. Model 1303: part No. 750658
Valves
Remove valve cover (1). Before changing the valves (2) - note their
orientation so they are replaced correctly! It is recommended to use
new O-rings (3) when changing or checking valves.
Diaphragms
Remove the diaphragm cover (4). Remove the diaphragm bolt. The
diaphragm (5) may then be changed. If fluids have reached the
crankcase, re-grease the pump thoroughly. Also check that the drain
hole at the bottom of the pump is not blocked.
Reassemble with the following torque setting.
Valve cover: 45 Ft/lb (60 Nm)
Diaphragm cover: 50 Ft/lb (70 Nm)
Diaphragm bolt: 45 Ft/lb (60 Nm)

Cone check/replacement for pressure regulation valve

If it becomes difficult to build up sufficient pressure or if pressure
fluctuations occur, it may be necessary to replace cone and cylinder.
1. Remove 4 x screws (A) and remove the housing.
2. Remove 4 x screws (B).
3. Replace cylinder (C) and O-ring (D).
4. Loosen the nut (E), remove and replace the cone (F).
5. Reassemble in reverse order.
6.8