Operations On The Hydraulic Circuit During Maintenance; Hydraulic Circuit Emptying; Hydraulic Circuit Filling - WAGNER Unica 4-270 Translation Of The Original Operating Manual

EDITION 09 /2015
OPERATING MANUAL
6.3.1.1

OPERATIONS ON THE HYDRAULIC CIRCUIT DURING MAINTENANCE

If the pump is subjected to maintenance regarding the fl uid section which not implies the
disassembling of the diaphragm covers (parts nr. 16 given in the picture of Paragraph 8.5),
the hydraulic circuit system does not undergo any particular change and the following
operations are not necessary.
If the maintenance in the fl uid section concerns components whose access to or disas-
sembly of require the disassembling of the pump covers (picture Paragraph 8.5), then the
following operations (emptying and fi lling up the hydraulic circuit with working fl uid) are
necessary.
If the maintenance concerns the pneumatic motor or the hydraulic circuit itself, the fol-
lowing operations are necessary.
WARNING: the best possible performance of the vacuum system inside the hydraulic cir-
cuit is important to guarantee the longest possible life of the membranes. The following
operations are hence to be carried out only by Wagner authorised technicians.
6.3.1.2

HYDRAULIC CIRCUIT EMPTYING

Referring to the assemblying picture in Paragraph 8.4:
1. Get a container to collect the hydraulic fl uid and place it under the pump.
2. Disconnect hose nr. 17 from quick coupling nr. 10 and extract the hydraulic fl uid
collecting it in the dedicated container. Dispose of the fl uid in compliance with the
local law regulation.
6.3.1.3

HYDRAULIC CIRCUIT FILLING

After maintenance, remount the various pump sections except the outer protections (par-
ts 3 and 4 in the diagram in Paragraph 8.2), connect the pump to the compressed air sup-
ply line, see the picture given in Paragraph 8.4 and proceed as follows:
1. Unscrew caps nr. 11 and valve bodies nr. 12.
2. Fill the hydraulic circuit with working fl uid.
3. With the pump air pressure reducer completely closed,
open the motor air shut-off valve (parts C and D, diagram
in Paragraph 5.1.6).
4. Paying great attention to squirts, slowly open the air
pressure reducer and run one/two cycles of the pneumatic
motor. Then close the pressure controller. This operation
allows emptying the residual air in the hollows of the
hydraulic circuit.
5. Refi ll the hydraulic circuit with working fl uid.
6. Remount valves nr. 12.
7. Run the pump for about one minute, collecting the excess
hydraulic fl uid discharged by valves nr. 12 in the previously
used container.
8. Remount caps nr. 11 and the rest of the pump.
PART NO. ZZB028ENG
Unica 4-270 N
D
C
C_41_00020
.
11
12
36