Checking Parts Subject To Wear; Minor Problems: Causes And Solutions; Disposing Of Motor Pumps; Electrical Connection - Zenit GRS Manuel D'utilisation Et D'entretien

- Fill the chamber completely with biodegradable oil, CASTROL HYDROIL P46 or similar, and once full remove 20-25
cc to ensure a sufficient air cushion in the chamber;
- When finished tighten the plug and re-install the motor pump.
If none of the above is available, exceptionally, common vaseline oil can be used. For maintenance, contact our
nearest service centre.
Any repairs to the motor pump must be carried out by the manufacturer or by specialist personnel. If this is not
respected, the guarantee will be invalidated and the machine may become unsafe.

5.2 CHECKING PARTS SUBJECT TO WEAR

Before inspection and maintenance operations carefully read and apply the safety procedures indicated in
paragraphs 1.2 and 1.3
During programmed maintenance or at any time in which the performance of the motor pump should be reduced or if
vibrations and noise should increase, the hydraulic parts subject to wear must be checked. Original spare parts only
should be used. If the hydraulic part should be partially or totally blocked it should be cleaned thoroughly with a jet
of high pressure water. If necessary dismantle the hydraulic part referring to the exploded view in fig. 2 - 2/a on page
79-80.
To restore the hydraulic characteristics of the motor pump use the appropriate hexagonal spanner on the grub screws
inside the inlet hole which regulate the distance between the impeller and the shimming plate, which must be between
0.3 and 0.5 mm.

6. MINOR PROBLEMS: CAUSES AND SOLUTIONS

FAULTS
motor does not turn
motor functions normally but no
water is pumped
pump has reduced flow rate
thermal protector has cut in

7. DISPOSING OF MOTOR PUMPS

In the event that is not considered economically viable to repair a worn or damaged motor pump, the motor pump
and motor must be disposed of in full compliance with local regulations.
To dispose of a motor pump proceed as follows:
- remove any oil in the chamber and dispose of in a specialised collection centre;
- separate the parts in plastic and rubber and dispose of in a specialised collection centre;
- arrange for the break-up of the metal parts.
Do not dispose of any motor pump component in the environment.

8. ELECTRICAL CONNECTION

8.1 SINGLE PHASE ELECTRIC MOTOR CONNECTION

Single phase model APS - APE motor pumps equipped with Shuko plugs are connected by inserting the plug into a
suitable electrical socket. For plugless single phase model APS - APE motor pumps connect the yellow-green lead to
earth and supply power to the leads attached to the motor pump. For single phase model GRS – GRI – GRE
motor pumps, connect the yellow-green lead to earth and supply the leads exiring from the capacitor/circuit
breaker box. For single phase model
breaker box should be disconnected, reconnect the motor pump output leads as follows: BLACK lead to a line
connector; blue lead to the other line connector or to a capacitor connector;BROWN lead to the other capacitor
connector.
POSSIBLE CAUSE
no voltage
automatic switch tripped
impeller jammed
thermal protection cut in
check valve jammed
blocked pipeline
impeller, valve or pipelines obstructed
liquid level too low
incorrect supply voltage
wrong direction of rotation (three phase motor)
impeller jammed
temperature of liquid too high
GRS – GRI – GRE motor pumps, if the leads from the capacitor/circuit
check the power supply line
reset the switch and establish the cause
establish the cause of the trouble and
remove it
resets
versions)
clean the valve and check its operation
identify the obstruction and remove it
identify the obstruction and remove it
turn the pump off immediately
match
indicated on the data plate
invert any two phases
identify the cause of the trouble and
remove it
contact your nearest zenit dealer
12
SOLUTION
automatically (not on
the voltage to the values
-EX