1217
Model Code Page
90. Working hydraulics
1. 11. 1998
6250--8950 910 9D
Working hydraulics on HiTech trac-
tors
See picture 2C.
1. Oil tank
2. Suction strainer (125 m)
2a. Pressure---limiting valve 0,2 MPa
3. Twin gear pump, 25+11 cm
3
/r
4. Safety valve 23 MPa.
5. Pressure---test point (Valmet HPR)
6. Pressure filter (filtration grade: β25=75).
--- by---pass valve, 0,40 MPa.
6a. Indicator lamp switch, blocked filter
7. Priority valve
8. ---
9. Steering valve (125 cm
3
/r).
--- s a f et y v a l v e 1 4 M Pa
10. Steering ram
13. End flange (inlet side)
--- p re s su re --- l im i t in g va l v e 1 9 M Pa
19. Control valve (Bosch)
--- s h oc k v al v e 20 MPa
20. Lifting rams
21. Liftin rams+transmission breather (filtration grade:
β10=75).
23. Servo valve block (safety valve 0,4 MPa + pressure---limi-
ting valve 1,8 MPa)
36. Return oil connection, auxiliary hydraulics
37. Oil cooler
The function of the working hydraulics is the same as shown
on page 910/9.
Note! ThedifferentservovalveblocksontheLHsideofthe
gearbox, see under code 420 pages 420/17 ---20C.Various
valve blocks and low pressure hydraulics are described
under code 440. In addition, HiTech tractors’ pressure ca-
librations are shown under code 370 (Autocontrol V).
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