
178
4.9.2 Additional Power Takeoff
Power is taken from the main shaft of the transfer box through flexible clutch 2 (see Fig-
ure 147) and is used for winch drive.
Additional Power Takeoff operation is possible at any gear of the transfer box, neutral
including. To lubricate gear bearings and transfer box shafts in the additional Power Takeoff
crankcase a plunger-type pump is installed.
1-Crankcase; 2-clutch; 3-shaft; 4-shaft bushing; 5-selector chamber housing; 6-selector rod; 7-fork; 8-
spring; 9-cover; 10-diaphragm; 11-seal; 12-flange; 13-gasket; 14-cover; 15,23-ball bearings; 16-pump side
rod; 17-piston; 18,21-pump valves; 19-plug; 20-safety valve; 22-pump casing
Figure 146 - Additional Power Takeoff
The pump consists of the piston 17 with pressure valve 18, of safety valve 20 and the
casing 22. The piston with the side rod is mounted on the shaft 3 cam, and when it rotates, the pis-
ton translates. To avoid excess pressure and rpm increase, differential suction valve is designed
with a coil spring. Oil is sucked through the tube connected to the transfer box oil bath, and is fed
to the gear bearings from the pump through channels made in the shaft 3 and the transfer box
main shaft. Some oil leaks through backlashes and lubricates shaft bearings.
Information of Additional Power Takeoff control is given in paragraph 4.2.4 “Transfer
Box”, clause 4.2.4.4 “Transmission Devices Control”.
Содержание 4320M
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