the contact patterns of each gear mesh and to allow inspection of internal
features of the lubrication system.
2.8
LUBRICATION SYSTEM
2.8.1
General
The speed reducer shall be provided with an oil lubrication system that
will provide continuous lubrication to the gears, bearings, and oil
lubricated-type backstop. The system shall consist of an oil circulating
pump, [oil-to-water] [air] heat exchanger, piping, filters, and controls.
Each reducer shall be provided with its own system. The oil circulating
pump shall be driven directly from the speed reducer shaft. The maximum
oil sump temperature at rated speed and load shall be 70 degrees C 160
degrees F at an ambient temperature of 40 degrees C 100 degrees F. If a
hydrodynamic thrust bearing is used, its lubrication system may be part of
the gear reducer lubrication system, or a separate lubrication system may
be provided.
2.8.2
Oil Pumps
The oil pumps shall be positive displacement type. Each pump shall have a
relief valve which discharges to the sump. The pump shall be reversible so
it continues to function during a runaway condition.
2.8.3
Prelubrication Pump
**************************************************************************
NOTE: An electric motor-driven prelubrication pump
is recommended where hydrodynamic thrust bearings
will be used to ensure an optimum oil film is
developed prior to startup. Many applications with
hydrodynamic thrust bearings do not use electric
motor-driven pumps. The designer has the option of
omitting the requirement for an electric
motor-driven pump.
**************************************************************************
The reducer shall be prelubricated prior to startup. The prelubrication
pump shall be positive displacement, hand-operated type where antifriction
thrust bearings are used. Where hydrodynamic thrust bearings are used, the
prelubrication pump shall be an electric motor-driven positive displacement
type. The electric motor-driven pump shall deliver sufficient pressure to
lift the thrust bearing runner from the shoes. The pump shall operate in
manual and automatic modes. In automatic mode, the prelubrication pump
shall supply oil prior to reducer startup, shall continue operation at
least 30 seconds after reducer startup, then shall automatically shut down.
In manual mode, the prelubrication pump shall be started and stopped from
a local push button station. Available power for the pump and controls
will be 480 V, 3 Ph, 60 Hz and 120 V, 1 Ph, 60 Hz. The pump shall supply
oil through the lubrication system prior to reducer startup. The pump
shall utilize zero-leakage check valves to isolate it from the lubrication
system during operation of the reducer. The prelubrication system shall
not require valve operation to execute the prelubrication cycle or to
return to normal operation.
2.8.4
Oil and Breather Filters
The lubricating system shall have two oil filters on the pump outlet side.
SECTION 15005A
Page 14
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