Ulma HWS, User Manual, Page: 61 / 66

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HYDRAULIC WINDSHIELD SYSTEM HWS
6.3.2. MAINTENANCE OF THE HWS SYSTEM

Before assembling any system part, check that it is in
good working condition (rust, deformation, etc.).

Before the first climbing stage and at each
subsequent stage, check that:
- All hydraulic connections are correct.
- The hydraulic system HWS works properly.
-
The Heads HWS and Climbing heads HWS work
properly.
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Check monthly:
-
The correct state of the heads HWS and
climbing heads HWS ensuring their proper
working. Lubricate the joints of the climbing
heads.
-
Check the correct arrangement and working of
bolts, pins, wedges and joint components, in
general.
- State of hydraulic hoses (without holes or
brittle rubber due to ageing, etc.) and tight
connections of the hoses at the power unit and
the cylinders.

Special care is taken when handling (especially at
assembly) the hydraulic cylinders, hydraulic power
units, heads and climbing heads.

All parts which get in contact during the climbing
stage of the HWS system, should be properly
lubricated to minimise the friction between mobile
system parts, and consequently, possible live
overloads in the system. The mobile components to
be lubricated on the contact surfaces are:
-
Masts.
- Climbing heads HWS.
-
Heads HWS.

No alteration or change neither to the system
components nor to the assembly of the HWS system
is made without the approval and under the
supervision of personnel of ULMA.

All welding which affects the operation of the HWS
system are carried out under the supervision of
personnel of ULMA.
6.3.3. MAINTENANCE OF THE HYDRAULIC EQUIPMENT
Preventive maintenance should be carried out on all
equipment and accessories connected to the hydraulic
power units in order to prevent possible breakdowns
that could result in significant damage:

Visually check all hose and tube connections to
detect possible hydraulic fluid leaks.

Verify that the equipment is capable of working at
maximum pressure . The standard equipment
working pressure is 160bar, being its maximum
190bar.

Check there are not any leaks in the pressure
gauges.
General maintenance frequency is described next:

External Cleaning:
- Monthly.
- Enables an easy leak location and a quick
intervention.

Air filter review:
-
Monthly. Eventual cartridge change.
- Cartridge Reference: MPFILTRI A7L10

Hydraulic fluid filter review (return):
- Weekly.
- Cartridge should be changed when indicator
gauge passes its limit (red zone) or once a year.
- Cartridge Reference: MPFILTRI MF1003A10HB

Hydraulic fluid filling:
- Tank must be fulfilled when the level drops to
the minimum. The use of different types of
hydraulic fluid can cause some inconvenience.