Volvo D11 series, Installation Manual

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Power take-off
90
Power take-off positions
Accessories such as water pumps, steering pumps,
etc can be driven from various PTO positions on the
engine. These positions will vary, depending on en-
gine type, but generally accessories can be:
. Mounted on the engine, and belt driven from a
PTO groove on the crankshaft pulley. If the acces-
sory is mounted remotely from the engine, provi-
sion must be made for engine movement, e.g. by
use of a spring loaded jockey pulley.
2. Mounted on the front or back of the timing case,
and gear driven from the timing gears.
Belt driven power take-off
Crankshaft pulley, front end
The amount of power available from the crankshaft
pulley depends on the distance of the PTO pulley
from the face of the cylinder block, and the direction
of the resultant loads acting on the pulley.
It also depends on the pulley diameter and engine
speed.
Crank pulleys are available for each engine type,
some with an integral PTO groove, and some accept-
ing a "bolt-on" PTO pulley.
Tightening Torque
If the crankshaft pulley type is changed, it must be
ensured that the correct tightening torque for that pul-
ley is applied.
The tightening torque values are specified in the
Workshop Manual for each engine type.
V-belt transmissions
V-belt transmissions are easily adaptable for different
ratios (by using differently sized pulleys). This type of
transmission provides a flexible transmission, it has a
low noise level and is relatively free of maintenance.
The alignment, however, must be done carefully and
the V-belt tension must be easy to adjust.