Usage:
7271 Marine Transmissions
Reference: OPERATION OF EMERGENCY LUBRICATION SYSTEM: The design of 7271 Marine Transmissions permits a separate oil pump to be connected into the lubrication system for emergency operation if there is a failure of the standard pump. To do this, the suction line of the separate pump is connected to an opening in the oil strainer, and the discharge line is connected to an opening in the transmission housing as shown. When the separate pump is used for emergency operation, the lines to the standard pump must be blocked (closed) to control the flow of oil. This prevents a bypass of the system, caused by a return flow back through the standard pump. The method used to block (close) the lines to the standard pump for control of oil flow during emergency operation has been changed.
Description of Change: A new pump outlet elbow and a plate are now used to control the flow of oil during operation of the emergency lubrication system on 7271 Marine Transmissions. The new plate fits between the outlet elbow and the pump at the discharge opening. It is a double-end plate, with an opening at one end to permit a normal flow of oil, and no opening at the other end. When a separate pump is connected to the system for emergency operation, it is necessary to remove the bolts and slide the plate so the end with no opening closes the line. This prevents any return flow of oil back through the standard pump, and also keeps pressure oil out of the pump during operation with the emergency system. Formerly, a manually operated ball valve was used in the pump inlet line to prevent return flow.
Adaptable To: All earlier 7271 Marine Transmissions equipped with the former valve.
Location of components for emergency lubrication system.