© HAMM AG 2009 57
MAINTENANCE
3.1.4 Use of biologic hydraulic oil
The hydraulic system of the machine is gener-
ally filled with mineral oil in factory. All mainte-
nance intervals given in these maintenance in-
structions are related to mineral oil.
The use of biological hydraulic oil is admissible
under the following circumstances:
• Only biological oil on the basis of special
synthetic saturated complex esters may
be used. The products used and recom-
mended by HAMM can be taken from the
lubricant indications 3.2.2. Other oils used
must correspond to the specifications of
the oil above mentioned. The neutralisa-
tion value (oil acid) may not be bigger than
2.
• When the hydraulic oil is changed (biologi-
cal oil replaces mineral oil or vice versa),
all filters in the oil circuit must be changed
after 50 operating hours. After that, the fil-
ter change intervals given in this instruc-
tions apply again.
• Used biological oil must be disposed at a
reliable place of disposal, just like mineral
oil.
3.1.5 Refrigerant conditioning
For liquid-cooled engines, special care must
be taken for the conditioning and the control of
the refrigerant; otherwise, corrosion, cavitation
and freezing can cause motor damage.
The conditioning of the refrigerant is performed
by adding a cooling system protection agent to
the refrigerant.
The cooling system requires constant monitor-
ing. Apart from the control of the refrigerant
level, this also implies the verification of the
concentration of the cooling system protection
agent.
The concentration of the cooling system pro-
tection agent can be done with commercially
available test devices (example: gefo
glycomat ®).
The concentration of the cooling system pro-
tection agent in the refrigerant should not ex-
ceed or fall short of the following values:
/i
The products used and recommended by
HAMM (free from nitrites, amines and phos-
phates) can be taken from the lubricant indica-
tions 3.2.2. The factory-filled refrigerant mix-
ture consist of 40 % cooling system protection
agent and 60 % water. This guarantees freez-
ing protection up to -25 °C (-13 °F). The cool-
ing system protection agent can be purchased
from the HAMM customer service, ordering
No. 313238.
The use of the cooling system protection agent
offers effective protection against corrosion,
cavitation and freezing.
Cooling system protection agent Water
max. 45 Vol. % 55 %
min. 35 Vol. % 65 %
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