196
Model Code Page
42 Gearbox
20420
6000--8750
15. 5. 1996
1. 9. 2002
Servo valve block on tractors which have 3---step quick ---shift gear 660071---, (Delta Powershift)
Picture 21. Servo valve block on tractors which have Delta
Powershift, 660071 --- (compare with picture 20 on previous
page).
Y1=Solenoid valve for diff. lock
Y2=Solenoid valve for PTO
Y3=solenoid valve for 4WD
Y4=Solenoid valve for reduction gear
Y6=Solenoid valve for overdrive
S16=Transmission oil temperature sensor (warning light)
S17=Transmission oil pressure sensor (warning light)
Note! Sensor S17 in the picture above is fitted on the valve
block up to ser. no. 670581.Fromser.no.670582 incl. there
is a new sensor , which has two wires (earth and supply) and
the pressure values a re 10 ---50 kPa. Apply Loctite 542 to the
threads of the sensor.
P=Oil supply from low pressure pump
V1=Valve spool for direct ratio of Delta Powershift
7= Pipe connector for connecting return oil side of working
hydraulics
8) Restriction/counter valve (Ø 1,6 mm restriction hole). This
valve is located in the 4WD pressure outlet, and in connection
with 650 DPS, also in C3 multi ---disc clutch pressure outlet.
9) Valve slide
9a) The adjustment of the valve slide has been done in the fac-
tory (grinding it so, that the clearance 9a and the correspon-
ding clearance at the left boring comes true).
Normally there is no need of adjustment. The slide is available
as spare part, when needed, adjustment by grinding.
Earlier model: The position of the adjusting screw i s marked
with a punch point.
New model: The adjusting screw has been replaced with a
plug. in this way the possible faulty adjustments can be
avoided.
10) Temperature sender unit for Agrodata --- display (option).
In this servo valve block the pressure---limiting valve (section
A---A)isthesameasshowninfigure
20B on previous page.
Also the oil cooler safety valve (section B---B) and the 4WD re-
striction/counter valve ( s e c t i o n C --- C ) a r e t h e s a m e .
Theservovalveblockabovehaspartswhichareneededfor
3---step quick---shift gear (Delta Powershift). Otherwise the
construction of this servo valve block corresponds to the valve
block presented in picture 20B on previous page.
Important! I f r e p a i r w o r k c o n c e r n s t h e 3 --- s t e p q u i c k --- s h i f t
gear (Delta Powershift), see section 44 page 440/13.
Also this valve has the cushioning valve for the PTO clutch,
see also section 46.
Important! If the valve block should be removed, push with
a large screwdriver the lubricating oil pipe (see picture 23
point 2 on page 420/22) towards the gearbox. Push the
screwdriver through the oil cooler lower pipe connector.
Otherwise the lubricating o il pipe lower end can loosen from
the distribution pipe.
Note! With effect from tractor ser. no. 665536 the valve block
has been changed. The modified valve block can be fitted in
place of the earlier block. When fitting the latest valve block,
t h i c k e r ” O ” --- r i n g s ( KH 4070) must be fitted between the gear-
box and the valve block.
Note! The threaded plug (1) has been removed and has been
replaced with a lockin plate which is fastened on the valve
block with a screw. In this case the valve spool does not need
any adjustment, but it is in the correct position when the lock-
ing plate is fitted.
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