258
Model Code Page
91. Hydraulic system
1. 11. 1998
6000--8750 911 4
1. 9. 2002
D. Removing hydrauli c p ump
1. Drain the oil from the transmission.
2. Remove the PTO housing (see Op. 462 1A).
A
A
3. Remove the RH side brake cylinder. Disconnect the con-
nectors from the pressure pipes. Slacken the sealing pieces
(A) and unscrew the pressure pipes from the pump.
2434
4.Slackenthepumpsuctionpipeclip.
Note! The differential can be in place because it does not pre-
vent removal of the pump.
5. Unscrew the pump fixing bolts and remove the pump from
the gearbox housing.
E. Fitting hydraulic pump
1. Fit the pipe clip (screw upwards) onto the suction pipe. Fit
the pump coupling sleeve into the pump drive mechanism (if
removed).
2. Fit a new pump. Turn the pump clockwise and tighten the
fixing bolts to 40 ---50 Nm.
Check, that the pump goes fully home by hand and the main
axle of the pump is not pressed axially. There should not be
gap between flange of the pump and frame of the gearbox.
3. Push the pressure pipes through the sealing pieces and
screw the pipes into the pump thread to a torque of 60 Nm.
4. Apply sealing compound Hylosil RTV Grade 102 Black be-
tween the gearbox and sealing pieces. Apply Loctite 542 to
the sealing piece screws and tighten them.
5. Connect the pressure hoses to the pressure pipes. Fit the
brake cylinder.
6. Tightenthesuctionpipecliptoatorqueof 2Nm.
7. Fit the PTO unit (see Op. 462 1G).
8. Fill the transmission with oil and test--- drive the tractor. Make
sure that the new pump is functioning by measuring hydraulic
pressures.
Note! For the pump is available a seal kit no. 32664100. The
high pressure pump safety valve (and separate parts) are
available as a spare part. During warranty period the pump is
changed as a complete unit.
Important! From ser. no. H19317 incl. (in transmission 650)
there is a Bosch---make pump in the hydraulic system. From
ser. no. H18329 incl. the pum p pressure pipe lead---in plates
and their seals have been changed in transmissions 650, 300
and 390.
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).
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