Hishift - Valtra 6000 Workshop Manual

41. Clutch

6. HiShift

A. Adjustment
Note! Adjustment has been done in the factory and HiShift
does not normally require any adjustment. In connection
with repair works the adjustment can be done according to
this instruction.
Note! There is an access hole on the side of the steering
wheel console, through which the adjusting screw can be
turned.
Time
1. Pedal up 4. Driving speed < 4 km/h
2. Pedal down 5. Driving speed > 4 km/h
3. Knee point 6. Clutch slips and engages
1. Check the clutch fluid level. Raise the tractor on axle
stands. Start the engine and use the HiShift several times
so that air is removed from the system.
2. Close the cab side restriction spindle. The foremost
restriction spindle should be open 2 turns.
3. Depress the clutch pedal by using the push button.
Select e.g. gear F/M/1. Adjust engine revs to 800---1000
r/min (greater than 1500 r/min if the tractor has a fluid cou-
pling, i.e. Hi ---Trol models).
4. Release the button at which time the pedal rises up to the
knee point (3), in which the working cylinder piston rests
against the damping piston. Tractor wheels must not rotate.
5. Open the cab side restriction a little, at which time the
pedal starts to rise slowly. The wheels must start to rotate
before the pedal has risen 10 mm (ideal value 5 mm) from
the knee point.
Note! On account of possible small leakage of the restric-
tion spindle the pedal can start to rise slowly before the
restriction spindle is opened. The knee point (3) can,
however, be observed from change of rising speed of the
pedal.
1. 4. 1997
Restriction spindles
6. If necessary, adjust the position of the knee point
(adjusting screw at the end of the damping piston). Screw
outwards=point rises and vice versa.
7. When the knee point has been adjusted, close the cab
side restriction and then open it 1+1/4 turns. The foremost
restriction should be open 2 turns (factory setting). Lock the
restriction spindles.
8. In a test---drive with driving speeds under 4 km/h the
pedal rises up slower (4) (restriction 1+1/4). With speeds
over 4 km/h the pedal rises up faster (restriction
(1+1/4)+(2)). When the shuttle lever button is used , the
pedal always rises slower regardless of the driving speed.
Note! Tractor driver can adjust the Hi Shift between certain
limits according to his own choice. However, the cab side
restriction must always be open at least 1 turn, to prevent
excess wear of the clutch disc.
9. Check the function of the clutch. Drive under and over 4
km/h and check that the engagement occurs softly. Ensure,
that the pedal hinge functions. Check for leaks.
Fault tracing.
If the clutch pedal in paragraph 4 rises direct to the upper
position:
--- the cab side restriction spindle leaks.
--- solenoid valve Y15 does not function or leaks.
--- damping cylinder filling valve leaks.
660
Model Code
6000-- 8750 411
Knee point
adjusting
screw
Page
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