ADJUSTMENTS AND MAINTENANCE
5-12
b) Torque-sensing drum variator [if
installed] -- Figure 24
The drum variator belt is tensioned automati-
cally according to the torque on the drum
shaft (“Torque-sensing drum variator”).
Checking variator adjustment
Start the engine and engage the threshing
mechanism. Move the drum variator to
MINIMUM. The variator arms J should be
against the frame. Stop the engine.
Distance X, which is the clearance between
the driven sheaves, should measure mini-
mum 1 mm.
Move the drum variator to MAXIMUM.
Distance Y, which is the clearance between
the drive sheaves, should measure mini-
mum 1 mm.
NOTE:
In both minimum and maximum position
the variator belt should not protrude more
than 3 mm beyond the variator sheaves.
Adjustment
(i) Variator on MINIMUM position:
Move pivot block D against the frame.
Adjust nut K until a belt depth of 105 mm
on the intermediate shaft pulleys is ob-
tained or distance X measures minimum
1 mm. The initial setting of nut K is 56
mm.
(ii) Variator on MAXIMUM position:
Move pivot block D towards nuts L and M
until a belt depth of 100 mm on the drum
shaft pulleys is obtained or distance Y
measures minimum 1 mm.
T ighten nut L and jam nut M against pivot
block D.
NOTE:
In both minimum and maximum posi-
tion the variator belt should not pro-
trude more than 3 mm beyond the va-
riator sheaves.
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