Changing The Ball Seat In Operating Unit; Nozzle Tubes And Fittings - Hardi Boss Series Instruction Book

Diaphragms
Remove the diaphragm cover 4. The diaphragm 5 may then be
changed. If fluids have reached the crankcase, re-grease the pump
thoroughly. Check also the drain hole at the bottom of the pump is not
blocked. Reassemble with the following torque setting.
1 Nm = 0.74 ft-lb

Changing the ball seat in operating unit

If the main ON/OFF valve does not seal properly
(dripping nozzles when main ON/OFF valve
is closed), the ball and seat should
be checked.
Remove the 2 bolts fixing
the main ON/OFF-pres-
sure valve unit to the
bracket, unscrew the
union nut A and pull the
valve away from the distribution valves.
Check the ball for sharp edges and scratches, and check the ball seat
for cracks and wear - replace if necessary.

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
20
Pump Valve cover
Model
1302
1202
Diaphragm
Nm cover Nm
45
70
50
70
A
Diaphragm
bolt Nm
25
60