Zenit GRS Series, Use And Maintenance Instructions

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- Unscrew the plug and drain off the oil into a suitable container, or use an oil aspiration device.
- If the oil is clean, then the mechanical seal is still in good condition and the chamber can be refilled with fresh oil.
- If a very small quantity of water is detected at the bottom of the mechanical seal chamber, this will be due to
condensation and is normal, not a sign of any fault with the mechanical seal.
- If a substantial quantity of water has entered the oil chamber and contaminated the oil, this indicates that the
mechanical seal needs inspecting, and perhaps replacing
- 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 POSSIBLE CAUSE SOLUTION
motor does not turn
no voltage check the power supply line
automatic switch tripped reset the switch and establish the cause
impeller jammed
establish the cause of the trouble and
remove it
thermal protection cut in
resets automatically (not on -EX
versions)
motor functions normally but no
water is pumped
check valve jammed clean the valve and check its operation
blocked pipeline identify the obstruction and remove it
pump has reduced flow rate
impeller, valve or pipelines obstructed identify the obstruction and remove it
liquid level too low turn the pump off immediately
incorrect supply voltage
match the voltage to the values
indicated on the data plate
wrong direction of rotation (three phase motor) invert any two phases
thermal protector has cut in
impeller jammed
identify the cause of the trouble and
remove it
temperature of liquid too high contact your nearest zenit dealer
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