Valtra 6850 - Page 879

Figure 9. Lubrication system and clutch pressure pip-
ing up to tractor ser. no. 660070.
1. Servo valve block, ---660070 (on gearbox LH side)
2. PTO solenoid valve
3. Lubricating oil pipes (in gearbox housing)
4. Pressure to PTO clutch
5. Cushioning valve for engagement
6. Oil distributor piece
7. Lubricating oil to PTO clutch shaft
8. Lubricating oil to the PTO shaft
9. PTO clutch pressure
10. Pressure---test point
11. Pressure---test point
826
Model Code Page
46. Power take ---off
15. 5. 1993
6000--8750 460 12
1,8 MPa
11
10
3
7
6
9
1
2
4
5
8
Lubricating system
The PTO unit uses the same oil as the whole transmission/hy-
draulic system. In addition, pressure lubrication is directed
from the servo valve block via pipe (3) to the oil distributor
piece (6). From the distributor piece oil is directed to the PTO
clutch shaft bearings via pipe (7) and to the PTO shaft gear-
wheel sliding surfaces via pipe (8).
Note! Inside the lubricating oil pipe (12) is fitted the PTO
clutch pressure pipe (4).
PTO clutch pressure
Pressure oil to the PTO clutch is conducted from the servo
valve block (1) via cushioning valve (5) and pipe (4) inside the
gearbox housing.
Note! Lubricating oilpipe (3) and clutch pressure pipe (4)rear
ends have been sealed with o---rings against the oil distributor
piece (6).
Important! The piping has been changed with effect from
tractor serial number 659787. The new servo valve block is
fitted on tractors from ser. no. 660071 (see picture on the next
page).