EN – 46
Disassembling the pump
Disassembling
the motor block
(see page N-2)
Unscrew 4 nuts (
16
) and washers (
15
).
Remove motor assembly (
C
) and motor mounting plate (
22
). The coupling separates
into two halves, one (
2
) (
N-12
) on the motor side, the other (
1
) (
N-12
) on the pump
side.
Follow the chronological order of disassembling instructions.
See the drawings and their part lists in pages
N – 1
to
N – 13
Disassembling of the fan
Prevent fan (
17
) from rotating by wedging a wooden shim against the side of the frame
and two blades of the fan.
Remove elastomere coupling (
1
) (
N-12
).
Unscrew self-locking srew (
19
) (not reusable) and remove washer (
18
).
Using two M8 mm extraction screws, remove fan (
17
) and shim.
Remove screws (
26
) and washers (
27
).
Using two M8 mm extraction screws, remove cover (
13
) with double lip seal (
12
).
Removing pump from
system
The following steps are necessary to protect the pump as far as possible from the
effects of corrosion:
• Flush pump with a neutral gas (dry nitrogen) during half an hour to prevent toxic or
corrosive gases accumulating in the pump.
• C2 Model: Disconnect the nitrogen lines to the pump. If the sensors are connected,
disconnect them.
• Disconnect the pump from the system and seal off the inlet and exhaust ports. Bring
the pump to the maintenance area immediately.
• Drain pump (
see page 42
).
The first phase of disassembly is to disassemble the motor, the second is to disassemble
the pumping module.
In case of important pollution, roughly clean the pump with hot solvents under
pressure.
C2 Model
Dismantling gas ballast
(
see page N-10
)
Remove three screws (
22
) then (
23
), (
40
) and remove gas ballast assembly (
25
) and
O-ring (
26
).
Unscrew plug (
41
) (1/8“ NPT).
Remove PTFE tape from plug thread (
41
) and put new one when reassembling.
Remove the fastening screw (
19
) (C1 model) from the gas ballast knob (
20
) and
unscrew it completely, then remove the spring (
21
) (SD model) and the O-ring (
24
).
Remove the 3 screws (
22
) then (
23
), then remove the gas ballast assembly (
25
) and the
O-ring (
26
).
Valve (27)/valve support (28)/washer (29)/circlip (30) are not easy to
disassemble. All parts are available in an equipped gas ballast sub-assembly
(
see N-11
).
Do not store a pump in this condition for any length of time: once the
neutral gas has dissipated, the inside of the oil case will be in contact with
the ambient air laden with water vapor; this may react with the pumped
gases to form acids that may corrode the pump even at room temperature.
C2 Model
SD/C1 Model
Study the general precautions listed on Maintenance chapter page 37.
