DAF CF65/75/85 PTO

32 PTO
’REQUEST’ PTO 1 (= SWITCH ON)
When the PTO operation switch (C750) is
operated, a voltage is applied to connection
point 11 of A068 (engine speed application
connector) and connection point 27 of
connector 595 of D900 (VIC) through fuse
E091, wire 1240, contacts 5 - 1 of switch
C750 and wire 4594. This means that a
’request’ to use the PTO has been made.
This ’request’ is carried out depending on the
condition programmed in the VIC. A condition
might be that the parking brake must be
engaged. In this case, a voltage is applied to
connection point 1 of parking switch control
switch F000 through fuse E035 and wire
1211. This voltage is also on connection point
1 of connector 596 of D900 (VIC). If parking
brake control switch F000 is closed
(connection between contacts 1 - 2), this
voltage is also on connection point B22 of
D814 (UPEC electronic unit) and on
connection point 26 of connector 595 of D900
through wire 3402.
OPERATION
When the ’PTO request’ is carried out, the
following takes place:
A voltage is applied from connection point 23
and connector 593 of D900 to connection
point 1 of E570 (clutch - PTO N10 pneumatic
switch) (if present) and to connection point 3
of relay G259 (PTO-operation takeover relay)
(if present) through wire 4596. When switch
E570 (clutch - PTO N10 switch) is operated
by depressing the clutch pedal, (connection
between contacts 1 - 2), a voltage is applied
to connection point 1 of relay G259 and to
connection point 1 of B245 (PTO operation
valve). Relay G259 is energised and, as a
result, a connection is made between contacts
3 - 5 of relay G259. Relay G259 now remains
energised irrespective of E570 (this is a
’memory’ function). B245 is also activated and
this switches the PTO on.
The VIC checks that the PTO is actually
switched on. This takes place as follows:
When the PTO has been switched on, F087 is
operated mechanically. Contacts 1 - 2 of F087
close. Connection point 14 of VIC connector
593 is now connected to earth.
The VIC then sends a message to the DIP
and the “PTO active” warning is activated. In
the event that the PTO does NOT switch on,
F087 is NOT operated and connection point
14 of connector 593 is NOT connected to
earth. After a period of time programmed in
the VIC a ’message’ is sent to the DIP and the
“PTO fault” warning symbol is activated.
’CANCEL’ PTO 1 (= SWITCH OFF)
Breaking contacts 5 - 1 of C750 switches the
PTO off. This interrupts the voltage from
connection point 27 of connector 595. One of
the switch on conditions for operation of the
PTO is now absent. The VIC responds to this
by removing the voltage on connection point
23 of connector 593. The voltage on relay
G259 is interrupted and, as a result, the coil is
no longer energised. Contacts 5 - 3 open and,
as a result, the voltage on connection point 1
of B245 is lost. The valve is no longer
energised and the PTO is switched off.

SWITCHING ON PTO 2
A voltage is applied to connection point 5 of
C751 (PTO operation switch) through fuse
E091 and wire 1240. When this switch is
operated (connection between contacts 5 - 1),
voltage is applied to connection point 1 of
valve B246 (PTO operation valve) through
wire 4595. This valve is activated following
which the PTO switches on.
When the PTO is switched on, F088 (PTO
gearbox control switch) is operated
mechanically. A voltage is now applied to
connection point 1 of D094 (PTO 2 (orange)
warning light) through fuse E091 and wire
1240. Connection point 2 of D094 is
connected to earth through switch F088
(connection between contacts 1 - 2) and wire
3668. D094 is activated.
SWITCHING OFF PTO 2
Breaking contacts 5 - 1 of C751 switches off
PTO 2.
This interrupts the voltage on connection point
1 of C751. Valve C751 is no longer energised
and the PTO is switched off.
Switch F088 is re-opened (connection
between contacts 2 - 1 no longer exists). The
earth connection with D094 is interrupted and
the light goes out.
VARIANTS
Location
7 Option
26 Connection if there is no N10 PTO
clutch switch present.
32, 35, 44, 47:
Connector 626: only applicable for
FA type vehicle.
35, 44 Connector 650: only applicable if the
vehicle has an Allison gearbox.

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