655
Model Code Page
41. Clutch
6000--8750 411 7
1. 11. 1998
1. 4. 1997
3. Hydraulic coupling (Hi---Trol)
Note! See figure 4 on page 410/6 (Vo ith) or figure 5 on page
410/7 (Transfluid).
Hi---Tr ol---models have a hydraulic coupling between the fly-
wheel and the mechanical clutch.
Removing hydraulic coupling Voith (---658205, 666066 ---):
--- split the tractor at t he clutch (see instr 411 1A)
--- remove the mechanical clutch and its fixing plate
--- drain the oil from the hydraulic coupling through the drain-
ing plug.
--- unscrew the bolts on the outer sphere of the coupling. If
necessary, use extractor screws (there are threaded holes for
this purpose).
When fitting the hydraulic coupling the screws must be tigh-
tened evenly to 25 Nm.
Note! 0,2 litre oil remain in the later V oith coupling (666066---)
when the coupling is emptied through the draining hole while
the coupling is attached to the flywheel. The draining plug can
be removed and fitted via the hole in the tractor frame when
the plug is in theupper positio n.For instanceoil checking and
topping up is poss ible without splitting the tractor frame.
Reconditioning hydraulic coupling Transfluid
(658206---666065), see pages 411/8 and 9.
Oil quality and oil volume in hydraulic couplings, see page
130/4.
A. Checking function of hydraulic coup-
ling
Normally the hydraulic coupling does not need any mainten-
ance or adjustments. If there is doubt that the coupling does
not function properly, it can be checked as follows:
1.Warm up the engine tonormal workingtemperature by driv-
ing the tractor about 15---30 min (not any stall---test)
2. Check the pulling power (crawling) of the coupling at en-
gine idling speed (750 r/min). The pulling power of the coup-
ling is determined so that when gear H1 is engaged the tractor
is stationary when brake pedals are pressed lightly.
B . S t a l l --- t e s t
--- apply the parking brake
--- engage the highest gear H4
--- declutch and move the hand throttlelever tomax revs (front
position) and check the resultant R.P.M. Max stall---testperiod
is 10 seconds. The right value is 1100 ---1250 r/min (Voith) or
950---1250 r/min (6800: over 1200 r/min) (Transfluid).
Note! Do not repeat a new stall---test immediately after the
previous test because this will cause overheating on the hy-
draulic coupling and also the stall value becomes faulty
The hydraulic coupling characteristics can be changed by
changing oil level in the coupling. The coupling becomes
softer when oil is reduced and vice versa. Too high stall value
indicates that there is not enoughoil in the hydraulic coupling.
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