660
Model Code Page
41. Clutch
6000--8750 411 12
1. 4. 1997
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! Thereisanaccessholeonthesideofthesteering
wheel console, through which t he adjusting screw can be
turned.
Time
Pedal movement
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 clutc h fluid level. Raise the t r actor 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
restr iction 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 wor king cylinder piston rests
against the damping piston. Tractor wheels must not ro tate.
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
thekneepoint.
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.
Knee point
adjusting
screw
Restriction spindles
6. If necessary, adjust the position of the knee point
(adjusting s crew 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 (restrictio n
(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 bet ween certain
limits according t o his own choic e. However, the cab side
restriction must always be open at least 1 tur n, to prevent
excess wear of the clutch disc.
9. Chec k the function of the c lutch. Drive under and over 4
km/h and check that the engagement o ccurs 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 le aks.
--- damping cylinder filling valve leaks.
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