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1

2

3

4

5

6

7

10

11

12

13

14

15

16

17

19

A

B

 8

Sectional views of the services control valve with solenoid valves

[tractor with Dual Command (2 Speed Power Shift)]

A. Lever position with PTO synchronized with gearbox

engaged.

B. Lever position with electrohydraulic PTO 

commanded by flywheel engaged.

1. 4WD disengagement solenoid valve.
2. Front or rear differential lock engagement solenoid

valve.

3. Front or rear differential lock delivery union.
4. 4WD engagement line pressure gauge.
5. Oil flow cut−off lever to solenoid valve (14), flywheel

PTO clutch engagement, when engaged the PTO is

synchronized with gearbox.

6. Cam to adjust valve stroke (11).
7. 4WD engagement delivery union.
10 External plug on outlet line.
11 Oil delivery to solenoid valve (14) control valve rod.
12 Bolt retaining valve (11).
13 Valve seal and dust seal (11).
14 Solenoid valve for oil flow to PTO clutch or clutch brake.
15 Clutch brake delivery union.
16 PTO clutch engagement cylinder delivery union.
17 Outlet line to transmission casing.
19 Solenoid valve support delivery union.

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DESCRIPTION AND OPERATION OF ELEC-

TROHYDRAULIC PTO

The PTO installed on the tractor transfers motion to

the transported or towed implements. It can be con-

trolled:
a) directly by the flywheel;
b) synchronized with the gearbox.
The  electrohydraulically  engaged/disengaged  PTO

is available in three versions.

The description and operation is of the most complete

PTO, i.e.: the 540 − 750 − 1000, for the other two ver-

sions see page 19 of the TL series service manual

print 603.54.420.00.

The controls are located inside the cab on the right−

hand side to the rear of the driving position.

 9

a) PTO Independent electrohydraulically con-

trolled power takeoff (directly by flywheel)

To engage, proceed a follows:

1. Check that the knob (1, fig. 9) is in the STOP posi-

tion (A), equivalent to oil delivery solenoid valve

(1, fig. 12) de−energized.

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 10

2. Move  the  PTO  operation  selection  lever  (1,

fig. 10) onto (E). 

In this position the sleeve (2, fig. 11) is freed from

the toothed coupling of the gearbox gear (1), so

only the PTO connected to the flywheel via the

shaft (3) can work.

1

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2 3

 11

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Moving the lever (1, fig. 10) onto (E) acts, via the con-

trol  levers,  also  on  the  rod  of  the  control  valve (4,

fig. 12), which takes on the above−mentioned posi-

tion.
With the rod (4) in this position and the solenoid valve

(1) deactivated, the control valve hydraulic diagram

is as shown in fig. 12.
The line (11) receives pressurized oil from the pump

and the control valve (4) directs the pressurized oil to

the solenoid control valve (1).
With the solenoid valve (1) deactivated, the delivery

line to the PTO clutch engagement cylinder (2) dis-

charges and is connected to line (10), whereas the

delivery line to the clutch brake (3) remains pressur-

ized.
Under these conditions the PTO clutch is disengaged

and the clutch brake is engaged.
The  hydraulic  diagram  shown  in  fig.  20,  of  print

603.54.420.00, illustrates this phase.
In  this  phase  the  delivery  line  (7,  fig.  20)  is  dis-

charged, so the lubrication control valve (8) takes on

the position shown in fig. 20, permitting lubrication of

just the rear bearing of the clutch (3).
The pressurized oil from line (11, fig. 12) can also be

used for the services on lines (8) and (9).
The figure shows solenoid valves (5) and (6) deacti-

vated.
With solenoid valve (5) deactivated, the delivery line

(9) discharges and the 4WD engages.
With solenoid valve (6) deactivated the delivery line

(8)  discharges,  with  the  relative  disengagement  of

the front and rear differential lock.

Pressurized oil
Discharge oil

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2

3

6

5

4

7

8

9

10

11

 12

Service control valve hydraulic diagram (points 12 page 13)

1. Oil delivery solenoid valve to PTO clutch or clutch

brake (deactivated).

2. Delivery line (discharging) to the PTO clutch engage-

ment cylinder.

3. Delivery line (pressurized) to the clutch brake.
4. Control valve stem position (4) when the lever 

(1, fig. 10) is in position E.

5. 4WD disengagement solenoid valve.

6. Front or rear differential engagement solenoid valve.
7. Control valve support.
8. Delivery lines discharging

(front and rear differential disengaged).

9. Delivery line discharging (4WD engaged).
10. Outlet line to transmission casing.
11. Delivery line from the pump to the services control

valve (7).

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3. After having carried out operation (2, page 13),

turn the knob (1, fig. 13), onto (B), equivalent to

solenoid valve (1, fig. 15) energized.

This transfers movement from the flywheel, via

shaft (12, fig. 21, of the TL service manual print

603.54.420.00)  and  clutch  (3),  to  the  PTO

grooved terminal.

For the hydraulic operation derived from operations 2

and 3, see the description on page 16.

 13

With operations 2 and 3 (previously described) the

independent  PTO  is  electrohydraulically  engaged

and directly controlled from the flywheel.

Power takeoff speed selection lever

Proceed as follows.

1. Turn the knob (1, fig. 13) onto the STOP position

(A) in order to disengage the clutch (3, fig. 21, of

the TL service manual print 603.54.420.00) of the

power take−off.

2. Pull the stop knob (1, fig. 14) upwards and move

the  lever  (2)  onto  sector  (3)  on  the  selected

speed;  this  operation  acts  on  parts  (7  and  8,

fig. 4,  of  the  TL  service  manual  print

603.54.420.00)  and  on  the  speed  engagement

sleeve forks (9).

3. Turn the knob (1, fig. 13) onto (B) to re−engage

the PTO clutch.

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DESCRIPTION AND OPERATION

With  lever  (1,  fig. 10)  on  E  and  solenoid  valve  (1,

fig. 15) energized, the hydraulic diagram of the con-

trol valve is the one shown in the figure 15.
The line (11) receives pressurized oil from the pump

and the control valve (4) directs the pressurized oil to

the solenoid control valve (1).
With the solenoid valve (1) activated, the delivery line

to the PTO clutch engagement cylinder (2) is pressur-

ized, whilst the delivery line to clutch brake (3) dis-

charges and is connected to line (10).
The PTO clutch is therefore engaged and the clutch

brake is disengaged.
The hydraulic diagram shown in fig. 21, of the TL ser-

vice  manual  print  603.54.420.00,  illustrates  this

phase. In this phase the delivery line (7, fig. 21) is

pressurized, so the lubrication control valve (8) takes

on the position shown in the figure, permitting lubrica-

tion of the clutch front/rear bearings and the clutch.
The pressurized oil from line (11, fig. 15) can also be

used for the services on lines (8) and (9).
The figure shows solenoid valve (5) and (6) activated.
With the solenoid valve (5) activated, the delivery line

(9) is pressurized and 4WD is disengaged.
With the solenoid valve (6) activated, the delivery line

(8) is pressurized and the front and rear differential

lock is engaged.

Pressurized oil
Discharge oil

MDE0047A

1

2

3

6

5

4

7

8

9

10

11

 15

Services control valve hydraulic diagram (points 2 and 3 pages 13 and 15)

1. Oil delivery solenoid valve to PTO clutch or clutch

brake (energized).

2. Delivery line (pressurized) to the PTO clutch engage-

ment cylinder.

3. Delivery line (discharging) to the clutch brake.

4. Position of the control valve rod (4, fig. 15) when the

lever (1, fig. 10) is in position A.

5. 4WD disengagement solenoid valve.

6. Front or rear differential engagement solenoid valve.
7. Control valve support.
8. Pressurized delivery lines 

(front and rear differential engaged).

9. Delivery line pressurized (4WD disengaged).
10. Outlet line to transmission casing.
11. Delivery line from the pump to the services control

valve (7).