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ATTENTION: AT WIRE BREAKAGE IN THE CONTROL CHAIN OF FDA DRIVE
ELECTROMAGNET THE FDA DRIVE AUTOMATIC SWITCH ON, INDEPENDENT OF
THE SET MODE (INCLUDING MODE "FDA DRIVE IS SWITCHED OFF)!
3.13.3 Front PTO shaft control
The front PTO shaft is controlled by the electronic hydraulic system. The electronic
part of front PTO control system is a part of complex system of DL, FDA, PTO and gear
shifting control and consists of CECS unit 1(figure 3.13.1), located in cabin on panel to the
right of the driver, of discrete distributor 10 with electromagnet and of pressure sensor of
FPTO drive engaged condition 9, fixed on bracket for coupling drive control, of connecting
harnesses 14 with the plug socket 7 which is under the cabin.
The system is powered from onboard electric system through security and switching unit
2 according to electric circuit diagram of complex system of DL, FDA, PTO and gear shift-
ing control (Annex C). Supply voltage comes into system after turn of starter and instruments
switch in position "Instruments ON".
On face plate of CECS unit 1 there are buttons 24 and 25 of on/off switching of front
PTO drive, near to them are situated annunciators 22 for indication of set mode and be-
tween them is located annunciator 23 of FDA drive engaged condition (oil supply under
pressure in FDA drive clutch) and button 21 of emergency stop of front and rear PTO.
The distributor 10 controls oil flow, that is supplied to hydraulic cylinder of bend
brakes control mechanism of front PTO planetary reduction gear unit. The discrete pres-
sure sensor 9, that is active (contacts closing) under pressure above 0,6...0,8 MPa is in-
stalled in hydraulic line for oil supply from distributor 10 to hydraulic cylinder. From sensor
9 is active annunciator 23.
It is necessary to press button 24 to engage front PTO. In this case voltage is sup-
plied to electromagnet of distributor 10 and respectively oil is supplied into hydraulic cylin-
der chamber of front PTO control. Engagement of front PTO drive is displayed by annun-
ciator 23. It is necessary to press button 25 to disengage front PTO. In this case the elec-
tromagnet of distributor 10 is deenergized, the hydraulic cylinder chamber joints with drain,
annunciator 23 goes out and front PTO drive is disengaged.
At engine stop front PTO is automatically disengaged and after next engine start it
is necessary to press button 24 to engage front PTO.
3.13.4 Rear PTO shaft control
The rear PTO shaft is controlled by the electronic hydraulic system. The electronic
part of rear PTO control system is a part of complex system of DL, FDA, PTO and gear
shifting control and consists of CECS unit 1 (figure 3.13.1), located in cabin on panel to
the right of the driver, of distributor 6 with electromagnet and of pressure sensor of rear
PTO drive engaged condition 5, fixed on rear axle on the right and connected with CECS
unit 1 with harnesses 14.
The system is powered from onboard electric system through security and switching unit
2 according to electric circuit diagram of complex system of DL, FDA, PTO and gear shift-
ing control (Annex C). Supply voltage comes into system after turn of starter and instruments
switch in position "Instruments ON".
On face plate of CECS unit 1 there are buttons 27 and 26 of on/off switching of rear
PTO drive, near to them are situated annunciators 22 for indication of set mode and be-
tween buttons 27 and 26 is located annunciator 23 of rear FDA drive engaged condition
(oil supply under pressure in rear FDA drive clutch) and button 21 of emergency stop of
front and rear PTO.
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