Lukas LZR 12-700 EN - Manual (Page 10)

10
9 Dismantling of the device / Stop after operation
9.1 Rescue ram
After each use retract the piston rod until it protrudes only a few mm. This hydraulically and
mechanically relaxes the device.
9.2 Hydraulic Power Package
As soon as the rescue work is finished, the power package must be switched off, and the
hoses must be disconnected from the ram.
Remark: While being stored, the piston of the ram might advance slightly due to changes of the
ambient temperature. The reason for the piston movement is that the oil volume in the piston chamber
and the rod chamber would expand its volume differently when exposed to temperature changes.
Therefore, the storage compartments for rescue rams (e. g. inside the truck) must be built in such
a way that the piston may advance by approx. 30 mm without damaging the compartment wall.
10 Maintenance
10.1 Rescue ram
After each operation a visual check has to be accomplished, at least once per annum. Every 3
years or if there are doubts about security or reliability, an additional funtional test has to be
accomplished.
(clean them first if necessary)
Visual inspection
• Ram and piston rod without damages and deformations.
• Claws in the right position and jammed tight,
• Claws in a good condition (breaks),
• No leakages,
• Easy operation of the star grip,
• Handle existing and fast,
• Identification plate and position plates legible,
• Quick connect couplings can be connected easily,
• Dust covers in the right position.
Hoses
• Check according safety instructions for hoses (see item 5)
• Check for oil leakage
Function testing
• Piston stroke can be retracted and extended to the full length (see technical data 13),
• Perfect opening and closing with star grip standard version.
11 Repairs
11.1 General
Servicing must be carried out only by the device manufacturer or by personnel trained by the
manufacturer or the authorised LUKAS dealers.
For replacement on all components, use only genuine LUKAS spare parts as specified in the spare
parts list, as here possibly required special tools, mounting information, safety aspects, testing
must absolutely be taken into account. See Section 4.
Protection of the device against hydraulic overload
If the short hoses of the tool are not connected with the power pack, pressure can be built up
unintentionally in the cylinder due to temperature increase. Therefore, the return hose (0,5m / blue)
of the tool is equipped with a safety coupling (quick connect plug, colour yellow). Unintentional
overpressure (approx. 1.5 MPa) is released through this plug: oil comes out.