91
6 - Maintenance
Occasional maintenance
Replacing the 321 valves and diaphragms
Diaphragms
Dismantle the crankcase (4). Now, the diaphragm (5) can be replaced.
Grease the pump if the liquid has leaked to the inside. Make sure that
the draining hole is not obstructed. Reassemble the pump again.
Torque settings for the 321 are:
Crankcase: 60 Nm / 44.4 lbft.
Crankshaft: 70 Nm / 51.8 lbft.
Diaphragm screws: 60 Nm / 44.4 lbft.
WARNING! Before assembling the covers, turn the shaft with the
hand and make sure that the connecting rods are ascending
and descending respectively. If not change the position of the
4 connecting rods. The fi rst connecting rod must be assembled
towards the right-hand side.
SV operating unit
The SV operating unit open and close via a pilot line as in picture A, a
small piston activated by the solenoid , opens up a small hole, hereinafter
the liquid pressure opens op the larger diaphragm B in the valve, and
allows the liquid to fl ow to the nozzles.
The pilot line can block due to sedimentation of chemicals.
Unscrew the 4 Allen bolt, lift up the piston as in picture A, rinse out and
reassemble.
1
5
4
3
2
A
B
