DS 19 OPERATION No. US 312-3 :, Overhauling a clutch assembly. Op. DS 312-3 166
TOOLS
NOTE - Each rectification of the clutch driving plate surface causes loss of pressure on the clutch disc. To
compensate for this loss of pressure, fit steel washers to the springs, equal in thickness to the amount removed
from the clutch driving plate.
In order to obtain the thickness of these washers, take the dimension “c”, see fig. 3, which was originally
0
13– mm.
0.3
If the dimension “c” is less than 12 mm, the driving plate cannot be rectified and must be replaced.
6 Test the springs (use the fixture 2420-T, see Pl. 6):
+4. 5
6 springs, marked white : length 29.7 mm under a load of 64 kg.
0
+3.5
3 springs, marked green: length 29.7 mm under a load of 52 kg.
0
NOTE - If the testing fixture is not available, it is advisable to replace the springs at each overhaul . . . . . . . . . . Fixture 2420-T
7 Hook the springs (8) on the toggle carrier plate (2).
8 Put the clutch springs (6) on the bosses of the clutch driving plate (I), placing a spring marked white between two
springs marked green in the group of three between two toggles. Place on each spring, the cup (7), insert if
necessary, between the spring and the cup, the distance washers indicated in paragraph 5.
Offer up the carrier plate (2) on the cups corresponding to the marks made when dismantling, put the toggles (5)
under the springs (8). Put the screws (4) in position. Compress the assembly, put the washers (9) on the toggle
screws. Tighten the nuts (3).
9 To adjust the mechanism.
Put the clutch assembly on a fixture (use fixture 1701-T, see Pl. 43). Tighten the nuts (3) in order to bring the
toggles (5) into contact with the underside of the central pivoting lug (C) of the fixture (see Pl. 43, fig. 3).
In these conditions (clutch in the engaged position), the dimensions obtained should be “a” = 37 mm between
the toggles and the plate and “b’ = 17. 8 mm between the plate and the toggle carrier plate (see Pl. 43, fig. 2).
Operate the clutch and adjust the toggles. Lock the nuts by driving the metal. of the nuts into the slot of the
screw (4) using a chisel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 mm spanner
NOTE - If the fixture 1701-T is not available, the simplified fixture MR-3457-100 (see Pl. 44) can be used. In order Fixture 1701-T
to check the positioning of the toggles, operate the clutch with the aid of the press, before locking the nuts. Finger, ring and clamp
1704-T
On this assembly, the dimension ‘c” between the top of the toggles and the face plate is 57 mm Fixture MR-3457-l00
IMPORTANT - The clutch can only be adjusted in the engaged position. Using the fixtures shown on Pl. 43 and
44 automatically puts the clutch in this position.
The dimensions indicated can only be checked on these fixtures. When the clutch is released from the fixture,
the toggles rest on an uneven surface and it is impossible to obtain a correct dimension.
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