1221
Model Code Page
90. Hydraulic system
1. 8. 2000
6000--8950 910 11B
15. 5. 1996
Hydraulic pump and suction pipes,
658900---
See picture 4A on previous page.
With effect from tractor ser. no. 658900 thetractorshavea
new hydraulic pump. The construction of the pump and the
suction pipes is similar compared with the earlier system (see
picture 4 on page 910/11). Pump technical values have been
changed a little, see Technical Data on page 910/3.
Note! Bec ause the new pump has different outerdimensions,
the gearbox housing has also been changed at the same
time. The new pump cannot be fitted into the earlier gearbox
housing.
1. Twin gear pump
2. Suction strainer housing on the gearbox. The suction
straines should be cleaned according to the maintenance
program (see Operator’ Manual).
3. Safety valve for high pressure pump. Opening pressure is
23 MPa.
4. Pressure limiting valve for lubricating oil. Opening pressure
is 0,2 MPa.
5. Sealing plates at pressurepipe lead---in points. Apply Hylo-
sil---silicone to the lower face of the plates.
Thepumpisremovedandfittedinthesamewayasearlier
according to instruction on page 911/4.
Important! From ser. no. H18329 incl. the pump pressure
pipe lead---in plates and their seals have been changed in
transmissions 650, 300 and 390.
From ser. no. H19317 incl. (in transmission 650) there is a
Bosch---make pump in the hydraulic system.
The new Bosch pump is replaceable with the earlier pump,
when the pump connection parts are changed (suction con-
nection is not necessary to change). A new part is fitted
between the pump and the suction connect ion, and the pres-
sure connection has been changed. The safety valve body
has been changed, the other parts as earlier. In connec t ion
with possible repair work new lead---in plates and seals must
be fitted.
Note! On HiTech tractors, the low pressure pump output is
greater than in earlier tractors , which have a mechanical
shuttle (25+11 cm
3
/r).
Note! From autumn 2000 there is the same hydraulic pump
as in HiTech models (25+11 cm
3
/r) in transmission 550.
Transmission 550 is in 6200---6550Hi tractors from ser. no.
K36112 incl. (6200---6400 from K41106---).
Low rev tractor 8350Hi has pump 32+11 cm
3
/r.
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