Disassembly And Reassembly; Periodical Checks And Maintenance - Salvatore Robuschi RN Serie Instructions D'utilisation

- when bearings are ready for the delivery are preliminarily greased
with high quality grease.
d) Oil lubricated bearings:
- pumps are delivered without any oil, therefore, before starting, it is
necessary to fill the bearing housing. Oil is checked by the level rod
which bears the highest-lowest notches.
- Turn over the glass bulb and pour oil into the pipette until it reaches
the level as indicated in the fig. 3: fill the glass bulb and put it into the
vertical position. Check that the level of the glass bulb remains
constant. The types of oil indicated in tab.1 are valid for temperatures
between -10° and 120°C.
e) Auxiliary fittings: connect, where necessary, flowing-, barring-
heating- or cooling- pipes.
If the pump is supposed to work with cold, warm or
dangerous liquid, cautions have to be kept to prevent any
possible accident
4. STARTING
1. Do not run the pump dry.
2. Start the pump only after filling completely with liquid through the
hole designed for this purpose (replace threaded plug after each
operation). When operating with positive suction head, fill the pump
by gradually and completely opening the inflow gate valve, while
keeping open the delivery gate valve to release air. Close completely
the delivery gate valve and check the suction head's pressure to
make sure the maximum final pressure is not higher than the one
tolerated by the pump.
3. If the pump is supplied with a packing gland, check that the gland
exerts the right pressure against the seal rings. in case of
mechanicals seals, check that the cover is perfectly closed against
the casing. Open the washing liquid's feeding of the packing or of the
mechanical seal and regulate the flow.
4. If seal chamber's cooling is provided, open the feeding of the
cooling water, regulating its circulation.
5. When the pump is provided with steam preheating chambers, the
steam must flow in from the upper connections.
6. Start the pump with the delivery gate valve closed. Then open
slowly the discharge gate valve, regulating the working point within
the limits indicated on the plate. Make sure the rotation's direction is
the one shown by the arrow on the pump casing. If rotation is in the
opposite direction, reverse the connections of two phases.
Stopping the pump.
Close the delivery gate valve, if a check valve is not fitted.
Close the suction gate valve, if a check valve is not fitted
Switch off the motor.

5. PERIODICAL CHECKS AND MAINTENANCE

Caution: disconnect the electrical power before any
servicing operation.
Make sure the pump works in conformity with the range of specified
performance levels and the absorbed current indicated on the plate is
not exceeded.
Pumps with mechanical seal.
Mechanical seals do not require maintenance. Except for possible
initial leak after the first stat-up, the mechanical seal on the shaft
must function without any loss of liquid. Do not run the pump dry.
When a leak occurs and increases gradually, the seal must be
replaced.
Packing gland.
Pumps with packing glands need a little dripping.
When dripping through the stuffing box becomes excessive and it
cannot tighten any further, change the seal rings. (see fig. 5 and tab.
3).
Bearing.
Pumps are delivered without oil, therefore, before starting, it is
necessary to fill the bearing housing (see tab. 1).
About every 3000 working hours, remove ball bearing oil.
To choose oil viscosity follow tab. 1.
For grease lubrication follow tab. 2.
Liquid temp. Viscosity cSt
-10+50°C 22
10+70°C 32
70+120°C 68
Tab.1 Oil characteristics
Suggested oil type
AGIP - OSSO, ESSO - TERESSO
IP - HYDRUS, SHELL - TELLUS
MOBIL - D.T.E.
5
Typ Grease Typ Grease
e [g] e
6207 5 -
6306 5 3306
6309 10 3309
6311 15 3311
Tab. 2 Grease characteristics

6. DISASSEMBLY AND REASSEMBLY

Before disassembling, close the suction and delivery gate valves.
See the sectional assembly drawing.
When working with dangerous
warnings.
7. SEALS REPLACEMENT
Packing gland
Use seal rings suitable for the liquid that should be pumped. Seal
rings have to be cut properly (fig. 5). It is necessary to alternate the
gasket slits, so that they don't fit each other.
d D
l
Fig.5 Packing gland
Seal Chamber
Diameter dimension
d D l
32 48 65
40 60 78
50 70 80
Tab. 3: Packing gland's dimensions
Mechanical seals.
Stationary part mounting: make sure that the bevel (or chamfer) and
the housing are absolutely clean and free from ragged edges and
traces of working. Damp the housing and the stationary gasket with
alcohol, glycerine or a compatible liquid. Press the stationary part into
the housing using a covered stopper, mounted on the spindle of a
sensitive drill or a small press.
Rotary part mounting: make sure that shaft is smooth, clean and free
from sharp edges. Polish the shaft if necessary with a fine abrasive
cloth (about 400 grains) even if it has been ground. After having
damped the shaft with alcohol, glycerine etc, mount the rotary part
turning the seal with a gentle motion opposite to the spring's winding.
Make sure that the two lapped faces come into contact. It is harmful
to put grease, oil, and other similar substances between the seal's
faces, which must be absolutely clean (tab.3, tab.4).
8. REASSEMBLY
General principles
This operation is carried out by reversing the disassembly
instructions.
In particular remember to:
a) replace worn out bearings with others of the same type (see tab. 4)
b) replace coupling blocks with others of the same type
Size
32-12, 32,16, 32-20, 40-12, 40-16, 40-20C,
50-12, 65-12E
40-20A-B, 40-25, 50-16, 50-20, 50-25, 65-
12A-C, 65-16, 65-20, 80-16
65-25, 65-31, 80-20, 80-25, 80-31, 100-20,
100-25, 100-31, 125-25
80-40, 100-40, 125-31, 125-40, 150-31,
150-40
Tab. 4 Bearings
Original instructions
N.L.G. Suggested grease
[g] I. type
- 3 ESSO – BEACON EP2
10 3 MOBIL – MOBILUX EP2
15 3 SHELL – ALVANIA EP
25 3 GREASER
liquids, follow the
L
Packing Rings n° with
ring packing ring
8 6
10 6
10 7
Standard
bearings
Seal dia
Lato gir. Lato mot.
6207 ZR 6306 ZR
32
6207 ZR
40 6309 ZR
50 6311 ZR
due
3306
3309 B
3311 B