Lukas Telescopic Rams - Manual (Page 10)

10
11.2 Hydraulic system leakage
- Check devices for oil loss and replace defective seals if necessary.
Important:
Carry out the following procedures over an oilpan; dispose of used oil!
11.3 Cylinder components
To remove the oil remaining in the piston main zone and piston ring zone, unscrew both couplings
from the connecting blocks if necessary and wait until all of the oil drains.
Then flush and fill up fresh hydraulic oil. Screw couplings in and tighten them to 45 Nm torque. Vent
cylinders acc. to chapter 6!
Remark:
Please note that the oil filling must be completely flushed and replaced by another type of oil if there
is a significant change in the operating conditions (ambient temperatures). Also refer to the
following chapter.
11.4 Oil recommendation
Oil for LUKAS hydraulic devices: Mineral oil in accordance with DIN 51524 and others
recommended viscosity range: 10 ... 200 (mm
2
/s).
12 Problems / Trouble shooting
Index: P = Problem; S = Symptom;
F: Cylinder pistons cannot be retracted
S: red hose on the piston side is pressurized
—> quick-stop has been activated;
switch selector vlave to "lifting" for a moment and carefully start lowering again.
P: Hose couplings cannot be connected
S: red hose on the piston side is pressurized
—> hoses are under pressure since they have accidentally been disconnected without being
depressurized
- open union nut on hose, cover against oil spray,
- Hose is depressurized; pay attention to squirting oil,
- tighten union nut again (M
A
= 45 Nm).
Range of oil temperature Viscosity rating Remarks
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