19/28
NT 1004-C00 03 18 SLC12 i - SLC18 i - SLC12 i HT - SLC18 i HT e
• With the help of a hub puller, extract the piston
301
.
• Remove the cylinder
201
and the seals
113
and
306
.
6.2 Checking of parts
The piston
301
and the cylinder
201
are active parts
(wearing parts).on which the pump's efficiency directly
depends. It is therefore advisable to regularly check the
pump's efficiency and replace the cylinder / piston if it
decreases.
In addition, as using a cylinder / piston that is too worn
may damage the pump's transmission system, it is advi-
sable to replace the cylinder / piston if the maximum
acceptable wear dimensions defined in the table below
are reached.
As changes in the pump's efficiency depend on the
conditions of use (pressure, rotation speed, liquid pum-
ped, etc.), MOUVEX recommends that users define the
monitoring ranges and the preventive maintenance
schedule according to their own experience.
When controlling the piston and even if it has not reached
its minimum dimensions, it may show following aspects,
especially on abrasive liquid pumping or low viscosity :
• Triangular shape on top of piston wall (A),
• Small steps at piston wall base (B).
Before putting back the piston on the pump, eliminate
these asperities by filing and finishing with fine sandpaper
(No 320 grain or equivalent), taking care of not scratching
any other surface around. Piston must then look as follows :
Do not retouch any other surface of the piston by
any mean as it can degrade pump performance and
reliability. In particular, do not round or attenuate
disc wall edges.
Even if it shows wearing signs, do not retouch any
surface of the cylinder by any mean as it can degrade
pump performance and reliability.
Piston
301
mm
(inch)
Cylinder
201
mm
(inch)
SLC12
New dimension
9
(0,354)
50
(1,969)
Minimum wear dimension
acceptable
6
(0,236)
47
(1,850)
SLC18
New dimension
9
(0,354)
70
(2,756)
Minimum wear dimension
acceptable
6
(0,236)
67
(2,638)
301
201
6. OPENING OF THE PUMP (continued)
