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EDITION 09 /2015
OPERATING MANUAL
6.3
PUMP REPAIR
Before carrying out any maintenance operation:
1. Possibly wash the pump fl uid section (see Paragraph 5.2.3)
2. Release the pressure inside the pump following the procedure described in Paragraph
5.2.2.
3. Disconnect the pump from the compressed air supply line and disconnect the fl uid
section from the external suction and service circuits.
4. Remove the pump from the installation site and take it to a suitable place for the
maintenance work.
How to carry out a repair
Ordinary and extraordinary maintenance is to be carried out according to the schemes and
procedures given in this manual for Use and Maintenance,
In all cases:
1. Refer to a Wagner authorised technician.
2. Use only Wagner original spare parts.
3. Before assembling parts, make sure they are clean and, if necessary, lubricated.
4. Avoid damaging gaskets' sealing surfaces during maintenance.
5. Whenever the pump is assembled, replace all o-rings in the fl uid section which have
already been subject to previous tightening.
6. Avoid using silicone-based or silicone-contanining lubricants.
6.3.1
MAINTENANCE OF THE HYDRAULIC CIRCUIT
The Unica 4-270 N pump includes a fl uid-mechanical conservation system granting the
best possible performance of the diaphragms under normal working conditions.
The hydraulic circuit is normally full of working fl uid fi lled in the factory. The safety card of
the working fl uid can be supplied on request.
Before carrying out any maintenance involving the hydraulic circuit, the working fl uid has
to be removed as described in Paragraph 6.3.1.1.
The quantity of working fl uid necessary to fi ll the circuit is about 1 l. It is advisable to use
only Wagner spare fl uid:
Order number
Hydraulic fl uid Unica 4-270 N pump (1-litre bottle)
The fl uid-mechanical system inside the hydraulic circuit needs no maintenance and the
circuit doesn't usually need disassembling. The need to disassemble it may arise in case it
is necessary to replace parts inside the pump which are subject to maintenance.
If lacking Wagner spare fl uid after carrying out the maintenance, it is possible to tempo-
rarily fi ll the hydraulic circuit with water; however, it is advisable to replace it with Wagner
working fl uid as soon as possible. For further information please refer to a Wagner autho-
rised technician.
An explanatory picture is given below.
The assembling diagram of the hydraulic circuit is given in Paragraph 8.4.
PART NO. ZZB028ENG
Unica 4-270 N
Z126.00
.
34
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