Installation
Ultima Hooklift 01/2020
37
4.8 Hydraulic oil
Before filling up the oil check the interior of the oil tank for impurities and rust. Fill the tank up
to the maximum level shown in the oil level gauge. Carefully operate all the hooklift cylinders
fully in and out 4 to 5 times to remove the air from the hydraulic system. Check the oil level and
fill up if needed. The sliding cylinder must be operated in when checking the oil level. The oil
level must not exceed the maximum level.
The Ultima hooklift is delivered tested and cylinders filled with ISO VG 22 mineral oil, which
meets ISO 11158HV and DIN 51524 part 3 HVLP requirements. Alternatively the hooklift is
tested with ISO-L-HEES biodegradable oil, which is mentioned with a label in the oil tank and
bracket of control valve.
Always use similar type hydraulic oil which meets the following requirements:
ISO6743/4 type HM and HV
DIN 51525 part H-LP
SMS norm for hydraulic oils (SS 15 54 34AV)
Oil quality according to ISO VG with max impurities 9 NAS 1638
The oil viscosity must be chosen according to ambient operation temperature, especially in
case of extremely low or high temperatures another ISO VG grade hydraulic fluid must be
used.
In case of environmental friendlier hydraulic fluid (known as Bio-oil) the oil type must be syn-
thetic bio oil. A vegetable oil is not permitted because of possible damages in seals and gas-
kets. When changing the mineral oil to bio oil the whole hydraulic system must be drained and
flushed several times thoroughly in order to achieve the required cleanliness. To obtain the
best results, the percentage of the mineral oil should not exceed 2% of the oil volume. Contact
factory for possible bio-oil options.
Procedure for changing the oil type and viscosity class is the following:
1. Drain the hydraulic system from existing oil.
2. Fill the system with new filtered oil to a level to run the hooklift. Take into consideration
that the whole system is empty. The oil volume must be enough to fill the system and
also the pump must be able to get oil without any problem. Run the oil up to normal tem-
perature and operate all functions 4 to 5 times.
3. Operate the main cylinders and sliding arm cylinder in.
4. Drain the system as empty as possible.
5. Fill the system with new oil. Operate the hooklift as in point 2.
6. Repeat 2, 3 and 4 until the amount of mineral oil is under 2% of total volume.
Change all oil filters to new ones.
7. Change all oil filters after max. 50 working hours.
The hydraulic oils, especially mineral oils, are hazardous and must be disposed of in proper
manner and according to local authority regulations. Polluted soil must always be collected and
disposed of according to local legislation.
The safety data sheet of the hydraulic fluid must be available to the people working with the
hydraulic system. Hydraulic oils can irritate the skin and this may cause a serious skin condi-
tions. Always use hand protection against grease and oil. Clean your hands after service and
use a hand cream to protect them. Remember also always to protect eyes against contamina-
tion.
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