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MAINTENANCE
Hydraulic oil viscosity and adjustment of tempera-
ture switch units
If the new hydraulic oil has a different viscosity grade compared
with the drained oil it is necessary to adjust the temperature limit
values at switch units (K26, K39 and K100), illustration Z24089 in
accordance with the viscosity grade of the new hydraulic oil. The
switch units are located in the X2 switch box in the cab base.
Legend for illustration Z24089
K26 - Switch unit for hydraulic oil cooler fan speed control.
K39 - Switch unit for hydraulic oil temperature warning message
"Hydraulic Oil Temperature too high".
K100 - Switch unit for pre-load of hydraulic oil cooler circuit
Adjust switch units to the respective oil viscosity grade as
follows:
Oil viscosity grade
according to ISO
-K26- Adjust temperature
limit value to switching point
°C
-K39- Adjust temperature
limit value to switching point
°C
-K100- Adjust temperature
limit value to switching point
°C
Adjustment procedure for (K26, K39 and K100):
Adjust the temperature limit value at the cogwheel next to the
drum scale on switch unit front cover.
NOTICE
Turn the cogwheel sensitively. DO NOT turn beyond the
STOP marking, otherwise the internal potentiometer driver
pin will disengage resulting in wrong value transmission.
Refer to Service Bulletin No. AH02508b for functional test of
the switch unit.
REMARK
The switch unit (K8) is used for engine coolant temperature
warning message. DO NOT change the setting of this unit.
The switch units (K43) and (K182) are used for adjustment of the
pump distributor gear oil viscosity.
4.13 EVERY 2000 OPERATING HOURS OR YEARLY
VG 22
VG 32
VG 46
+32°
+41°
+50°
+58°
+69°
+79°
+9°C
+16°C
+25°C
VG
SHELL
VG 68
100
SL0851
+58°
+67°
+39°
+85°
+85°
+81°
+32°C
+39°C
+39°C
409
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