Valtra 6550 - Reconditioning 4 WD Clutch (Op. No. 443)

783
Model Code Page
443. 4WD clutch
6000--8750 443 1
15. 5. 1993
15. 6. 1992
Reconditioning 4WD clutch (Op. no.
443)
Note! In figures below an impulse disc can be seen which is
only on E ---models. Concerning tractors which have Delta
Powershift, see page 443/3.
A. Changing 4WD clutch discs/seals on
t r a c t o r s w h i c h h a v e 2 --- s t e p q u i c k --- s h i f t
gear
--- Split the tractor between the gearbox---fuel tank (see instr.
4411Aor instr. 423 1A).
--- r e m ov e t h e q u i c k --- s h if t gea r ( seeinstr.4411B)
--- remove the reverse shuttle (see instr. 442 A)
ETV 893 260
1. Fasten the 4WD outputshaft flange tothe vice. Unscrew the
shaft nut with socket spanner ETV 893 260.
Note! It is hard to open the nut because the cup springs press
the nut.
2.Removethespacerring,driveflangeando---ring.Tapatthe
shaft front end until it releases.
3. Remove the shaft front ball bearing from its location (re-
move first the oil seal, spacer ring and the circlip).
ETV 891 900
4. Fit a new bearing, circlip, spacer ring and oil seal into their
locations (sleeve ETV 891 900 can be used). Grease the seal
lips.
5. Detach the clutch cylinder and piston from the shaft by
knocking the shaft front end against the table.
Note! Thepistonisapressfit.
6. Remove the pressure plate on the disc pack. Remove the
friction and steel discs and fit new discs so that the steel disc
lugsareinlinewitheachother.
Note! The clutch discs are changed as a complete set. The
friction disc has worn out, if the grooves on it have disap-
peared.
ETV 890 830
7. Fit the pressure plate onto the disc pack. Drive the piston
onto the shaft with sleeve ETV 890 830.
8. Fit the cylinder onto the shaft. Before fitting it, check the pis-
ton and cylinder seals, and change them if necessary.