Cooling; Backstops; Starting-Up - Hansen P4 Manuel D'entretien

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T R A N S M I S S I O N S

7. COOLING

Heat generated in the gear unit due to friction and churning of the oil, must
be dissipated through the housing into the environment.
It is important not to decrease the heath dissipation capacity of the housing.
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Regularly clean the surface of the housing.
7.1. SEPARATE AIR COOLING
7.1.1. Fans
One or two fans may be mounted on gear unit shafts.
Warning
Do not run the gear unit without appropriate
protection covers
Check regularly that the air inlet and the air
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outlet are not obstructed.
Fans need no special maintenance, except occasional cleaning.
7.1.2. Air-oil coolers
The service manual of the lubrication and cooling system gives detailed
information about the air-oil cooler.
7.2. SEPARATE WATER COOLING
All water cooling systems must be connected to a non-calcareous water
supply. See also service manual on lubrication and cooling system and/or
technical leaflets on specific instrumentation. The use of seawater must be
specified with the order; coolers suited for use of seawater are available.
When unit is not operating and freezing temperatures may occur, water must
be drained from cooling system. Drain facilities have to be provided by end
user.
Unless otherwise stipulated, the water flow indicated on the dimensional
drawing is the required rate for water at 20°C (70°F).
According to load, ambient temperature and the water temperature a lower
rate will suffice. Adjust waterflow to obtain an oil working temperature bet-
ween 60 and 80°C (140 and 180°F).
7.2.1. Oil-to-water coolers
Refer to certified drawing for connection of the oil-to-water cooler to the
coolant.
The service manual of the lubrication and cooling system gives detailed
information about the water-oil coolers.
7.2.2. Cooling coils
Direction of waterflow is optional.
The cooling coils are suited for fresh as well as for seawater.
Maximum allowable water pressure : 0,8 MPa (8 bar, 116 psi).
Connection of cooling coil to water supply.
Warning: In order to avoid torsioning of cooling coil, hold premounted
connection with suitable wrench as shown in fig. 6 below.
cooling coil
FIG. 6

8. BACKSTOPS

Backstops are wearing parts and must be inspected or replaced at intervals
depending on operating conditions. The customer must take all necessary
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precautions to prevent that failure of the backstop could cause physical injury
and/or severe damage to the drive and/or application.
The time span between two inspections depends on the operating conditions
and the braking frequency, but should never exceed two years.
In case the backstop is part of a hoist drive which is subject to a periodical
safety inspection, the control of the backstop must be included in the inspec-
tion procedure.
In case of transport of people: the user has to follow local legislation re.
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inspection of safety devices.
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ENGLISH
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An inspection or replacement of the backstop is also required in the following
circumstances :
- In case of disassembly of the gear unit or one of its components
- In the event that abnormal wear or material break-out of gears, bearings or
any other component or pollution of the oil has been detected in the gear
unit, since this may have affected the condition of the sprags and raceways
of the backstop.
The outcome of the periodical inspection is to be reported in a log book.
Never loosen any part of the backstop while the
gear unit is loaded: loosening the backstop may
cause reversal of the drive and running back of
the load. Prior to loosening the backstop remove
the load and secure the drive against uninten-
tional movement.
8.1. STANDARD BACKSTOP INTEGRATED IN THE
GEAR UNIT
These backstops are lubricated by the oil bath of the gear unit and require,
apart from the regular inspections indicated above, no further maintenance.
8.2. EXTERNALLY FITTED BACKSTOP
In case the gear unit is equipped with an externally fitted backstop, please
refer to the corresponding additional Service Manual for maintenance and in-
spection. The above instructions for inspection remain valid.
Alteration of the direction of rotation of a
backstop may only be carried out by authorised
personnel and according
shown in the relevant instruction leaflet.

9. STARTING-UP

9.1. ALL GEAR UNITS
Before starting-up, check oil level with dipstick
and make sure that all points are lubricated.
Although all greasing points have been greased before delivery, it is
advisable to give a few shots with a grease gun before starting-up.
Check all fixation points between gear unit and foundation.
They may require retightening after some running time.
The alignment of the complete drive packages mounted on a bedplate has
been carefully checked before shipment. It is nevertheless required to check
that the bedplate has not been deformed during transport or installation.
Therefore check again alignment of couplings or other elements after final
installation.
Make sure that protection hoods and air guiding plates, if any, in case of fan
cooling are properly fitted.
Gear units may rotate in both directions except when direction of rotation is
indicated.
9.2. GEAR UNITS EQUIPPED WITH A BACKSTOP
The customer has to take the necessary precau-
tions to check and guarantee the good function-
ing of the backstop.
On gear units equipped with a backstop, check
whether direction of motor rotation corresponds
to backstop freewheeling
coupling motor to unit.
In case of complete drives, the direction of rotation of the motor has to be
checked by means of a phase meter.
Rotation of gear unit in reverse direction, even
momentarily, may damage the backstop, and
consequently is not allowed.
Units equipped with heaters must not be started before oil temperature is
above 5°C (40°F). Heaters have to be disconnected automatically when oil
temperature is above 15°C (60°F).
Temperature of oilbath will rise with increased load. Continuous operating
temperature of 80 to 85°C ( 175 to 185°F) is allowable for a standard gear
unit filled with mineral oil.
Occasional operating temperatures of up to 95°C (200°F) are acceptable.
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to the instructions
direction, before
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