Samoa DC20 Serie Guía De Servicio Técnico Y Recambio página 11

REPAIR AND MAINTENANCE PROCEDURES
BALL VALVES REPLACEMENT
1. Close fluid valves.
2. Drain the fluid from inside the pump. Anticipate a drainage of fluid from
inside the pump.
3. Loosen the screws to remove the directional valve. Take special care with
the O-ring seals and the orientation of the directional valve.
4. Remove the inlet and outlet manifolds. Take note of the orientation of the
manifolds.
5. Install a new set of valves and/or seats according to the assembly drawing.
Once the seats and seals are mounted, the seals should be visible.
6. Tighten the manifold screws following the tighten sequence according to
the table:
IMPORTANT: Always approximate manifold screws before final
tightening.
PP body PP conductive body
5 N·m
7. Assemble the directional valve checking all O-rings seals are placed and
tighten the screws with a maximum torque of 44 lbf.in (5 N.m).
AIR SENSOR (ONLY FOR MODELS WITH DIRECTIONAL VALVE)
The air sensors are on the inside part of the diaphragm covers. To access
them, follow the procedure for "Replacing diaphragms".
Once removed the covers following procedure:
1. Remove the two screws that secure the air sensor to the top.
2. Remove all components of the sensor. Clean the area.
3. Introduce new components in the order shown and tigh the two screws
sensor with a torque 1.5 N·m.
4. Fit the cover on the pump and tighten the screws to the body of the pump
according to the table:
PP body PP conductive body
5 N·m
SAMOA Industrial, S.A. · Pol. Ind. Porceyo, I-14 · Camino del Fontán, 831 · 33392 - Gijón - Spain · Tel.: +34 985 381 488 · www.samoaindustrial.com
POM conductive body
4.2 N·m 5 N·m
POM conductive body
4.2 N·m 5 N·m
PUSHING ROD
Remove the side cover on the right of the fluid inlet as shown in the figure,
following the procedure to "Replace diaphragms".
Once the shaft is visible, use the following procedures:
1. Remove the shaft from its housing by pulling it from one end.
The Teflon sleeve is threaded into the body. To remove use snap ring
®
pliers in the two holes indicated in the figure.
2. Once the cap has been removed, remove the quad ring inside the pump body.
3. Replace the kit following the correct order shown in the assembly drawing.
Reassemble the pump in reverse order.
6 1 3
4 2 5
IMPORTANT: When doing
pump maintenance that implies
manifold disassembling and pump
is fitted with PTFE o-rings (white
colour), they must be replaced by
new ones in order to avoid fluid
leakages".
a
R. 11/18 855 835
EN
11