Maintenance and Care

Maintenance and Care
8.8.5 Installation instructions for pipe and hose lines
The individual components of Hydraulic units are connected together by pipes and moving components by hoses.
It is imperative that the following steps be carried out prior to disconnecting hose couplings and fittings or before
replacing hoses and pipes:
1. The boom assembly is to be placed on the ground.
2. The machine (chassis) is to be placed on level ground.
3. Shut down engine and activate ignition. The hydraulic system has to be made zero-pressure by activating the
control lever and opening the hydraulic tank screw-cap (hydraulic tank is pretensioned).
4. Suitable containers must be positioned to collect the oil
Warning !
Escaping fuels and lubricants
• Can result in death or severe injuries.
• Always wear goggles and protective clothing.
Possible causes for faulty seals on fittings are:
1. Fitting is loose.
2. Fitting is deformed.
3. Fitting or line is damaged.
4. Sealing element (seal, edge, seal edge ring, O-ring) is damaged.
5. Connecting seal surface (flange fitting) not working freely.
Each time the compression nut is undone it must be retightened without using excessive force.
With correctly jointed and mounted lines and fittings, retighten the compression nut if there is a leak. If the leak
persists, the fitting must be opened and examined to see if it is deformed, cracked, or if the pipes are misaligned
or show signs of grooving. If the seal can not be achieved after the apparent fault has been remedied the fitting
must be replaced.
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