Figure 19. Servo valve block, --- 660070
4. Safety valve for oil cooler
3. Pressure---limiting valve, low pressure circuit
(opening pressure can be adjusted with shims)
TO
QUICK
--- S H I F T
GEAR
PRESSURE ---
TEST POINT
190
Model Code Page
42 Gearbox
15. 5. 1993
17A420
6000--8100
1. 9. 2002
Servo hydraulics and lubrication
TheservovalveblockisfittedontheLHsideofthegearbox
(see figures 17 and 19). The low pressure pump supplies oil
to the servo valve block, which has a pressure---relief valve
(1,8 MPa) and pressure ---test point.
There are solenoid valves for 4WD, PTO and diff. lock on the
servo valve block (solenoid valve for the quick---shift gear is
fitted on the gear).
On the valve block there is a transmission oil temperature sen-
sor (warning lights comes on at +93˚±3˚C) and oil pressure
senso r (warning light comes o n at 20---50 kPa).
Connections to/from the valve block:
--- inlet connection from pump (on front side)
--- outlet connection to diff. lock (on rear side)
--- outlet connection to 4WD clutch (on front side, external
pipe)
--- outle t connection to PTO clutch (on rear side)
--- outlet connectio n to quick---shift gear (on front side, exter-
nal pipe). From this connection has also been drawn a hose
to the priority valve
--- outlet /inlet connect ions to/from oil cooler (on front side).
Fro m the inlet connection has also been drawn a hose via
pressure ---limiting valve (0,2 MPa) to the pump suction side.
--- outlet connection to lubrication of transmission (on rear
side)
In addition, on the valve block there is a safety valve (0,4 MPa),
which protects the oil cooler. The lubricating oil pressure---li-
miting valve ( 0,2 MPa) is fitted at the rear end of the suction
strainer housing on the gearbox.
90-110Nm
72-88 Nm
20-50 k Pa
9-11 Nm
Loctite 542
18-22 Nm
90-96°C
45-55 Nm
4-5 Nm
15 Nm
60-80 Nm
DIFF. LOCK
PRESSURE
PRESSURE
TEST POINT
OIL COOLER
40-50 Nm
ø2mm
1,8 MPa
0,4 MPa
s= 0,2
0,5
1,0
2,0
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