Backstops; Starting-Up - Rexnord HANSEN P4 Manuel D'entretien

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T R A N S M I S S I O N S
7.2.1. Water-oil coolers
Refer to certified drawing for connection of the water-oil 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).
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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

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Backstops are safety devices and have to be inspected at regular time
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intervals .
The periodical inspection is to be carried out by authorised personnel and
according to the instructions described in the specific service leaflet supplied
with the gear unit .
Carefully read these service and inspection instructions before starting any
intervention on the backstop.
The frequency of the inspections depends on the type of application.
The following table lists the maximum interval between 2 inspections for a
number of applications, other applications require at least one inspection
every year.
Application
Hoist drives
Conveyors
Elevators
Cooling towers (QVP.2)
Cooling towers (QVR.2)
Screw pump drives
In case of transport of people: the user has to follow local legislation re.
inspection of safety devices.
An inspection 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
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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 unwanted
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.
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Maximum time interval
Every year
Every two years
Every two years
Every two years
Every five years
Every two years
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 erection.
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.
On gear units equipped with backstops, 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 are automatically disconnected when oil tempera-
ture is above 15°C (60°F).
Temperature of oilbath will rise with increased load. Continuous operating
temperature of 95°C (200°F) is allowable for a standard gear unit filled with
mineral oil.
9.2. GEAR UNITS WITH FORCED FEED
LUBRICATION
For the different parts of the lubrication system, refer to service manual of the
lubrication and cooling equipment and/or the technical leaflets concerning
the specific components.
9.3. GEAR UNIT DRIVEN BY A TWO SPEED MOTOR
When switching from the higher to the lower speed, first decelerate so that
the motor must accelerate when switched on at the lower speed. In this way
high synchronisation peak torques can be avoided.
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to the instructions
direction, before
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