Pump Valves And Diaphragms Renewal - Hardi NK SB Series Instruction Book

Pump Valves and Diaphragms Renewal

Valves
A. Loosen the 2 valve cover bolts (1).
B. Remove valve cover (2).
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ATTENTION! For 1303 pump only: Bolts (1) on centre valve cover
are shorter than the other valve cover bolts!
C. Change the valves (3). Note their orientation, so that they are
replaced correctly!
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ATTENTION! It is recommended to use new gaskets (4), when
changing or checking the valves.
Diaphragms
A. Loosen the 4 head bolts (10).
B. Remove the head (9).
C. Loosen the diaphragm bolt (8).
D. Remove the diaphragm washer (7) and the plastic disc (6).
E. The diaphragm (5) may then be changed. Note the orientation of the new diaphragm. The side that need to be faced
into the pump has written "DOWNWARD" close to diaphragm centre.
F. Check that the drain hole at the bottom of the pump is not blocked.
G. Apply a small amount of pump grease on the underside of the diaphragms (between diaphragm and conrod washer).
H. Reassemble pump with the following torque setting:
Valve
Pump Model cover
603 50 Nm
1203 80 Nm
1303 80 Nm
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ATTENTION! Before tightening the 4 bolts for the head (9), the
diaphragm must be positioned between centre and top to
ensure correct sealing between diaphragm pump housing and
diaphragm cover. Turn the crank shaft if necessary.
Lubrication After Assembly
After disassembling the pump (diaphragm renewal, etc.), the pump
MUST be lubricated into each lubrication point with:
• Model 603: 60 g.
• Model 1203: 90 g.
• Model 1303: 3x 35 g.
HARDI pump grease cartridge (400g): HARDI item no. 28164600
Overhaul Kit
Diaphragm pump overhaul kit (valves, seals, diaphragms etc.) can be ordered. Detect the pump model - the overhaul kit can
be ordered by your local dealer.
• Model 603: HARDI item no. 750656.
• Model 1203: HARDI item no. 750657.
• Model 1303: HARDI item no. 750658.
Diaphragm Diaphragm
cover bolt
50 Nm 25 Nm
80 Nm 80 Nm
80 Nm 80 Nm
6 - Maintenance
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