Nortrac XT20 Owner's Manual page 55

4.2.2 Adjustment of the clutch (double action)
In order to ensure the normal operation of the clutch,
the clearance between the master clutch disengaging lever
4 's working surface and the release bearing 5's end face
must be kept within 2 to 2.5mm; that between the end faces
of the slave clutch disengaging lever in 25-to-28 horse
power model and the release bearing 5 must be kept within
B=(10~10.5)mm (B=（10.5~11）mm for 30-to-32 horse
power model). Since the clutch friction plate constantly
abrades during its operation, the aforementioned clearance
will gradually diminish and even disappear. therefore, a
regular inspection and adjustment must be applied.
The adjustment method of the clutch pedal free
（1）
stroke is as follows:
First loosen the locknut (3) on the adjusting nut (2)
(as seen in Figure 4-3), then turn the adjusting nut (2) for
the adjustment, making the distance between the working
face of the three main clutch release lever (4) and the
working face of the
A=86.5+0.2mm for 25-28hp models; A=101.5+0.2mm for
30-32hp models; and finally lock the locknut (3). Loosen
the nut (7 and 8), turn the adjusting nut (8) to make the
distance between the working face of the auxiliary clutch
release lever (6) and the working face of the clutch
pressure plate (1) C=78.5+0.2mm for 25-28hp models;
C=93+0.2mm for 30-32hp models; and screw down the nut
(8). Adjust the clutch push rod control fork 4 (as seen in
Figure 4-2) to guaratee the free stroke of the clutch pedal is
(25-30)mm and lock the screw nut (5) after the adjustment
(see Figure 4-2).
(2) The adjustment method of the clutch pedal
working storke is as follows:
Loosen the screw nut (1) (as shown in Figure 4-2),
turn the stop screw (2) to make the working stroke below
the clutch rocker arm (3) 35–37mm and then lock the
screw nut (1).
Maintenance Instruction
clutch pressure plate
Figure 4-3 Double-action clutch
(1)
1. Clutch pressure plate 2. Set screw
4. Main clutch release lever 5. Release bearing
6.Auxiliary clutch release lever 7/8. Nut
49
3. Lock nut