Valtra 6550 - Page 891

838
Model Code Page
46. Power take ---off
1. 8. 1998
6000--8750 462 8
1. 1. 1995
2. PTO shaft seal and cushioning
valve
A. Changing PTO shaft/seal
1. Drain the oil from the transmission. Remove the PTO shaft
safety cap.
2. Remove the smaller circlip round the shaft and pull out the
PTO shaft. Also a spacer ri ng releases.
3. Fit a new PTO shaft and check and grease the o---ring on
it. Push the shaft fully home and fit the spacer ring and the cir-
clip.
4. Remove the larger circl ip behind the seal retainer and pry
out the retainer by using two screwdrivers.
5. Check/change the seal retainer o---ring in the PTO housing
bore.
IMPORTANT! Concerning tractors which have a new cas-
sette seal for the PTO shaft (H34332---), see picture on page
460/7 and the cassette seal fitting instruction on page
462/8A.
6. Pry out the old oil seal fit a new one with plate ETV 891 870.
7. Grease the seal lips and fit the seal retainer into its location.
Secure t he retainer with t he circlip behind it.
Note! There are shims between the seal retainer and the ball
bearing. Fit the same shims and fix them, if necessary, with a
little grease.
8. Fill the transmission with oil and check for leaks.
B. Cushioning v alv e for PTO engagement
1. The cushioning valve is fitted in the gearbox housing and
it is accessible when the small cover on the gearbox LH side
is removed.
Note! Before removing the cover, the gearbox oil must be
drained.
2
13
ø3,2
On tractors that have this cushioning valve (and the earlier
servo valve block), the PTO engagement can further be made
slower by fitting a ø 2 mm restriction into the gearbox housing
as follows:
--- remove the servo valve block and fit the ø 2 mm restriction
into the PTO clutch pressure passage in the gearbox housing.
The restriction remains a little above the gearbox housing sur-
face.
--- fit the valve block and check that it does not touch the
restriction, machine if needed.
Required parts:
--- Restriction, ø 2 mm 31742300...........
--- Gasket 32212400......................
Important! With effect from tractor serial number 660071 the
cushioning valve is fitted in the new servo valve block on t he
LH side of the gearbox, see the next page.