jcb JS300 Service Manual page 535

Testing
The expected fan speed for different engine coolant and
hydraulic coolant temperatures are given in the tables.
Important: The MECU sets the fan to the target speed for
the highest temperature. For example if the engine coolant
Engine coolant
temperature 0 C temperature
Less than 83
90
92
94
96
98
100
The 100% fan speeds for different engine speeds are
given in the table. These speeds are expected when there
is no PWM signal to the fan control solenoid.
Engine rpm
1900
1800
1700
1600
1500
1400
C-110
Hydraulic oil Expected fan speed rpm (H+
0 C power band selected)
65
70
72
73
74
79
84
Fan speed rpm
1372-1444
1300-1368
1227-1292
1155-1216
1083-1140
1010-1064
is 100 0 C and the hydraulic oil is 70
925 rpm not 740 rpm.
Use the fan test mode to test the fan and its solenoid
control valve. Refer to Machine Diagnostic Modes.
750
794
866
1011
1155
1300
1372-1444
9813/5100-1
Section C - Electrics
Engine and Power Control
Electro Viscous Fan
0 C the fan will run at
Required fan speed %
Idle
55
60
70
80
90
100
C-110