DAILY MCA2014 4x4 ‒ BODYBUILDER INSTRUCTIONS
POWER TAKE-OFFS
4.1 GENERAL SPECIFICATIONS
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– Printed 603.95.994 – 1 Ed. - Base 05/2015
POWER TAKE-OFFS
4.1 GENERAL SPECIFICATIONS
Different types of power take-offs (PTO) for motion withdrawal can be mounted for operating auxiliary units. Depending on the
type of use and performance required, the application can be fitted to:
● the gearbox;
● on the transfer box.
The characteristics and performances are given in the paragraphs which follow and in the relevant documentation which will be
supplied upon request.
For the definition of the power necessary for the apparatus to be controlled, particularly when the values requested are high, the
absorbed power should also be considered during the drive transmission phase (5 to 10% for the mechanical transmissions, belts
and gears, and greater values for the hydraulic controls).
The choice of the transmission ratio for the power take-off should be made so that the power absorption occurs in a flexible en-
gine operating range; low speeds (below 1000 rpm) must be avoided to prevent irregular running.
The available power can be calculated in relation to the power take-off speed and the established torque.
P [CV] = M • n • i / 7023
P [kW] = M • n • i / 9550
P = Available power
M = Torque permitted for the power take-off
n =Engine revolutions per minute
i = Transmission ratio = PT output rpm / engine rpm
Type of use
The maximum torque take-off values refer to continuous usage of up to 60 seconds.
Torque take-off values exceeding the maximum values indicated for occasional, limited usage (less than 30 s), must be approved on
a case by case basis in relation to the type of application.
In the case of continuous usage exceeding 60 seconds, where the function is comparable to that of a stationary motor, the necessity
of reducing torque take-off in relation to other, peripheral conditions (such as engine and transmission cooling necessities) must
also be evaluated.
In the case of continuous usage which may lead to high oil temperatures, it is advisable to contact the PTO supplier to determine
whether the installation of a dedicated external oil circuit kit is necessary.
The scheduled take-off values are also applicable for uses which do not involve large variations of torque either in frequency or
magnitude.
In other cases, to avoid overload (e.g hydraulic pumps, compressors) it may be necessary to include the application of devices such
as clutches or safety valves.
▶ During prolonged use, the gearbox oil temperature must not exceed 110 °C and the water tem-
perature must not exceed 100 °C.
▶ Not all types of power take-offs are suitable for continuous use; always follow the specific instruc-
tions for the power take-off during operation (working times, breaks etc.).
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