Doosan AD158TI, Operation & Maintenance Manual

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Main accessory parts - 53 -
5.2. Front Power Take Off
Refer to Service and Operation manual of AP Power Take Off company for detail operation and maintenance.
5.2.1. PTO Description and operation
Below figure shows a section view of a typical multiple-plate PTO.
A driveshaft(1) is carried in a cast iron housing(2). The tapered roller bearing(4) locates in the flywheel(5)
(various types of bearing can be specified) to support the input end of the drive shaft. The body(6) is pressed
on the drive shaft and retained by a key(28). External (male) splines on the body are mated to internal
splines on the pressure plate(7). With double and triple plate PTO there are intermediate pressure plates(8)
which also slide on the body.
Between the body and pressure plates are the friction facings(9) which (as shown on the lower figure) are
molded with gear teeth along the outside diameter. The gear teeth on the facings engage with gear teeth on
the drive ring(10) which is in turn bolted to the engine flywheel.
Power flow is from the engine flywheel to the drive ring, through the drive ring gear teeth to the friction fac-
ings. With the PTO engaged, the facings are clamped between the pressure plates and transmit power
through the splines on the pressure plates to the body. Finally, power is transmitted to the drive shaft through
the key(28).
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