Lukas Double-acting Rope-lift cylinder - Manual (Page 10)

10
11.2 Hydraulic system leakage
- Check equipment for oil loss and replace any defective seals.
Important:
Carry out the following procedures over an oilpan; dispose of used oil in accordance with
regulations.
11.3 Cylinder components
Remove any oil remaining in the piston chamber and piston ring zone by fully unscrewing the two
quick-connect couplings from the connecting blocks of all lifting cylinders and carefully draining the
oil.
Flush and fill up with new hydraulic oil. Screw in the couplings tightly and tighten to a torque of
M
A
=45 Nm Vent cylinders in accordance with Chapter 6.
Note:
Please note that the filled oil must be fully drained and replaced by another type if the operating
conditions (ambient temperatures) change significantly. Also refer to the chapter below.
11.4 Oil recommendation
Oil for LUKAS hydraulic devices: mineral oil in accordance with DIN 51524 and others
Recommended range of viscosity: 10 ... 200 (mm
2
/s).
12 Problems / trouble-shooting
Index: P = Problem S = Symptom
P: Rope-lift cylinder pistons do not retract
S: Red hose to the cylinder piston side is pressurised.
——> Quick-stop function on the lifting cylinder is effective; clear by briefly pressing "HEBEN"
(lifting) and slowly opening the corresponding switch control valve for "SENKEN" (lowering)
P: Hoses on the cylinder cannot be connected
S: Red hose to the piston side is pressurised
——> Hoses were incorrectly disconnected when pressurised.
- Slacken the union nut on the hose fitting; cover the fitting against oil spray.
- Hose becomes depressurised; pay attention to oil spray.
- Retighten the union nut (M
A
= 35 Nm).
Contact an authorised LUKAS dealer or the LUKAS Customer Service Department directly if the
malfunctions cannot be rectified. The address of the LUKAS Customer Service Department is:
LUKAS Hydraulik GmbH, Weinstraße 39, D-91058 Erlangen; PF 2560, D-91013 Erlangen;
Service tel.: +49 9131-698348; Fax +49 9131-698353.
Oil temperature range Viscosity rating Comments
A - 24 ... + 30 °C HL 5
B - 18 ... + 50 °C HLP 10
C - 8 ... + 75 °C HLP 22
D + 5 ... + 80 °C HLP 32
E - 8 ... + 70 °C HF - E 15 Biodegradable oil