201
Model Code Page
6000--8750
13440
44. Quick---shift gear, reverse shuttle
and 4WD clutch
1. 11. 1998
1. 9. 2002
Servo valve block with Delta Powershift and with mechanical shuttle (valve block with HiTech
Shuttle, see page 440/24)
Pressure---limiting valve, low pressure circuit
Safety valve for oil cooler
Picture 5. Valve block (on the LH side of the gearbox)
Y1=Solenoid valve of diff. lock.
Y2=Solenoid valve for PTO
Y3=Solenoid valve of front wheel drive
Y4=Solenoid valve for quick ---shift gear foremost clutch
(lowest ratio)
Y6=Solenoid valve for quick---shift gear middle clutch (inter -
mediate ratio)
S16=Transmission oil temperature sensor (warning light)
S17=Transmission oil pressure sensor (warning light). Modi-
fied, 670582 ---, see page 420/20.
P=Pressure oil inlet from the low pressure pump
1.Pressure---testpoint(ValmetHPR)
2. Oil inlet from the working hydraulic return oil
3. If plug 3 is to be removed, note its position by counting
opening turns or measure the plug depth from the valve sur-
face before removing the plug. Ensure that the punch mark is
at the plug groove. A valve spool behing the plug (3) directs
pressure oil to the planetary gear multi ---disc clutch when
both solenoid valves Y4 and Y6 are energized. Apply Loctite
242 onto the plug (3) th reads. The plug (3) has been re-
moved on the latest models and a locking plate has been
fitted in place, see page 420/20.
The different ratios are engaged with push buttons in the
speed gear lever knob:
I=lowestratio
II = intermediate ratio
III= highest ratio
When the so l eno id valve Y4 is energized, pressure oil affects
the quick---shift gear foremost clutc h C1.
When both solenoid valves Y4 and Y6 are energized. Pressure
oil affects in all three multi disc clutches. When pressure oil
does not affect the planetary carrier multi disc clutch, the
planetary gear is locked by the clutch Belleville springs.
When the solenoid Y6 is energized, pressure oil affects the
quick---shift gear clutch C2
Note! When the solenoid valve is energized, the nut at the end
of the valve becomes magnetic which can be verified with e.g.
a screwdriver. Concerning electric system of DPS, see section
31 code 310 (wiring diagrams), 311 (AC II) and 312 (AC 2.1)
Important! Concerning removal of the valve block, see page
420/20. With effect from ser. no. 668103, on 8200 and 8400
tractors (transmission 460) the DPS gear ratios have been
changed, see pages 440/14---15. Transmission 650, see
pages 440/15A and B.
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