Terex TA30 Maintenance Manual page 89

Fault MEANING OF CODE
Code possible reason for fault detection
(hex)
B3 K3
SLIPPAGE AT CLUTCH
TCU calculates a differential speed at closed clutch K3.
If this calculated value is out of range, TCU interprets
this as slipping clutch.
• low pressure at clutch K3
• low main pressure
• wrong signal at internal speed sensor
• wrong signal at output speed sensor
• wrong size of the sensor gap
• clutch is defective
B4 K4
SLIPPAGE AT CLUTCH
TCU calculates a differential speed at closed clutch K4.
If this calculated value is out of range, TCU interprets
this as slipping clutch.
• low pressure at clutch K4
• low main pressure
• wrong signal at internal speed sensor
• wrong signal at turbine speed sensor
• wrong size of the sensor gap
• clutch is defective
B5 KV
SLIPPAGE AT CLUTCH
TCU calculates a differential speed at closed clutch KV. OP-Mode: limp home
If this calculated value is out of range, TCU interprets
this as slipping clutch.
• low pressure at clutch KV
• low main pressure
• wrong signal at internal speed sensor
• wrong signal at turbine speed sensor
• wrong size of the sensor gap
• clutch is defective
B6 KR
SLIPPAGE AT CLUTCH
TCU calculates a differential speed at closed clutch KR. OP-Mode: limp home
If this calculated value is out of range, TCU interprets
this as slipping clutch.
• low pressure at clutch KR
• low main pressure
• wrong signal at internal speed sensor
• wrong signal at turbine speed sensor
• wrong size of the sensor gap
• clutch is defective
B7
OVERTEMP SUMP
TCU measured a temperature in the oil sump that is
TCU measured a temperature in the oil sump that is
over the allowed threshold.
B8
OVERTEMP RETARDER
TCU measured a temperature in the retarder oil that is
over the allowed threshold.
B9
OVERSPEED ENGINE
BA
DIFFERENTIAL PRESSURE OIL FILTER
TCU measured a voltage at differential pressure switch
out of the allowed range.
• oil filter is polluted
• cable/connector is broken or cable/connector is
contacted to battery voltage or vehicle ground
• differential pressure switch is defective
SM 1965 4-00
Transmission - Transmission and Mounting
TCU reaction Checks
•check pressure at clutch K3
TCU shifts to neutral
•check main press. in system
OP-Mode: limp home
•check sensor gap at internal
if failure at another
clutch is pending
•check sensor gap at output
TCU shifts to neutral
OP-Mode: TCU shutdown
•check signal at internal
•check signal at output
•replace clutch
•check pressure at clutch K4
TCU shifts to neutral
•check main press. in system
OP-Mode: limp home
•check sensor gap at internal
if failure at another
clutch is pending
•check sensor gap at turbine
TCU shifts to neutral
OP-Mode: TCU shutdown
•check signal at internal
•check signal at turbine
•replace clutch
•check pressure at clutch KV
TCU shifts to neutral
•check main press. in system
•check sensor gap at internal
if failure at another
clutch is pending
•check sensor gap at turbine
TCU shifts to neutral
OP-Mode: TCU shutdown
•check signal at internal
•check signal at turbine
•replace clutch
•check pressure at clutch KR
TCU shifts to neutral
•check main press. in system
•check sensor gap at internal
if failure at another
clutch is pending
•check sensor gap at turbine
TCU shifts to neutral
OP-Mode: TCU shutdown
•check signal at internal
•check signal at turbine
•replace clutch
•cool down machine
no reaction
•check oil level
OP-Mode: normal
•check oil level
OP-Mode: normal
•check temperature sensor
•cool down machine
TCU disables retarder
•check oil level
OP-Mode: normal
•check temperature sensor
retarder applies -
OP-Mode: normal
•check oil filter
no reaction
•check wiring from TCU to
OP-Mode: normal
•check differential pressure
Section 120-0010
Remarks
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
speed sensor
not used
differential pressure switch
switch (measure resistance)
Courtesy of Machine.Market
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