12.5 Removing and disassembly of the by-pass relief valve.
(fig. 8)
❑
Remove the entire relief-valve assembly, unscrewing the screws (46) taking care
not to damage the gasket(s) (32). If there is damage, it/they must be replaced.
❑
Remove the cap (26), the basket (35) by loosening the lock nut (25).
Remove the cover (19), taking care not to damage the basket (34). If the basket
is damaged, replace it..
Remove the valve washer (22), the spring (23) and the valve (20).
Check the state of wear of the valve and of its seat on the by-pass casing (18).
If necessary, replace it..
❑
Check the spring and washer, replace if necessary.
Re-assemble the valve by proceeding in the opposite way.
Note:
For the pressure setting, see paragraph 11.1. Set the valve to 1 bar more
than the delivery pressure.
12.6 Disassembly of the magnetic joint
(fig. 7)
❑
Dismantle the pump casing (01) from the support axle bearing (350) by
unscrewing the appropriate screws (44).
❑
Dismantle the axle bearing support (350) from the lantern by means of the
appropriate screws (914.1). Remove the nut (920) and lift the internal magnetic
nucleus (847.2). Remove the footstep thrust bearing (317) and, therefore, the
axle bearings (545) and (529).
The axle bearings are usually made of very fragile synthesized material
and should, therefore, be handled with extreme caution.
❑
Remove the glass (151), unscrew the screws (914.3) and remove the support of
the bearings (381) of the lantern. (341).
❑
Loosen the screw (900.1) and withdraw the external magnetic nucleus (847.1);
remove the seeger (932.1) and the spacer (505), withdraw the primary shaft (213) with the relevant bearings (321.1) (321.2).
13 ASSEMBLY
The normal procedure involves the inverse of what is mentioned above.
13.1 Mounting the idler bush
❑
The bush of the idler should be mounted with the aid of a press. It is perfectly symmetrical and can, therefore, be mounted equally in either
direction. When mounting the idler in its position, apply continual force. In the V180 and V200 models, preheat the idler and the support-
flange to 80
°
C prior to introducing the bush. Wait for complete cooling and work the hole with a machine tool until the tolerance indicated
by Varisco is reached.
14 STORAGE
If the pump is to be stored for a certain period of time, it is advisable to empty and clean it. If necessary, wash it with an appropriate solvent.
Avoid using water. Pour some oil, fuel oil or rust preventer into the pump, grease the bearing and turn the pump over a few times. If the
pump is to be left out in the open, close the ports and cover with a waterproof piece of canvas. In order to avoid condensation, ensure that
ventilation holes are left.
15 SPARE PARTS
In order to order spare parts, indicate:
-
type of pump.
-
serial number of the pump.
-
the reference number and the designer of the part, as indicated in the spare parts sheet.
16 DISPOSAL
-
Do not abandon in the environment.
-
The metal parts can be recycled back to the raw material.
-
Grease and oil must be recovered and stored as indicated in the relevant legislation for disposal by approved bodies.
-
The elastomere gaskets are to be separated and forwarded to be scrapped.
11
fig. 8
