DAF CF65, CF75, CF85 Series . Manual — part 413
©
200416
7-1
Engine brake, XE/PE engine
DIAGNOSTICS
ΧΦ65/75/85 series
4
1
7. ENGINE BRAKE, XE/PE ENGINE
7.1 INTRODUCTION
If there is a fault in the system, it is usually
detected by the electronic unit in the form of a
fault code. This fault code can be read out using
DAVIE. The fault-finding table contains possible
causes of symptoms not detected by the
electronic unit.
DIAGNOSTICS
7-2
©
200416
Engine brake, XE/PE engine
1
ΧΦ65/75/85 series
4
7.2 FAULT-FINDING TABLE
SYMPTOM: EXHAUST BRAKE DOES NOT ENGAGE
Possible cause
Remedy
Compressor delivers insufficient air pressure
Check the operation of the compressor
Air leak in the air pipe from air dryer to exhaust
brake valve
Check air pipe
Butterfly valve stuck in butterfly valve housing
Check free movement of butterfly valve
Electrical fault
Check electrical circuit
SYMPTOM: EXHAUST BRAKE REMAINS ENGAGED
Possible cause
Remedy
Butterfly valve stuck in butterfly valve housing
Check free movement of butterfly valve
Electrical fault
Check electrical circuit
SYMPTOM: DEB DOES NOT ENGAGE
Possible cause
Remedy
Electrical fault
Check electrical circuit
Engine oil pressure too low
Check engine oil pressure
SYMPTOM: DEB REMAINS ENGAGED
Possible cause
Remedy
Electrical fault
Check electrical circuit
Solenoid valve mechanically blocked
Check solenoid valve
Damaged solenoid valve sealing rings
Replace all solenoid valve sealing rings
SYMPTOM: DEB OPERATES IRREGULARLY
Possible cause
Remedy
Electrical fault
Check electrical circuit
Incorrect setting of DEB clearance
Check the DEB clearance
Main piston stuck in DEB housing
Check free movement of main piston
Operating piston stuck in DEB housing
Check free movement of operating piston
Damaged solenoid valve sealing rings
Replace all solenoid valve sealing rings
Solenoid valve oil strainer is blocked
Clean solenoid valve oil strainer
Control valve stuck in DEB housing
Check free movement of control valve
Defective control valve
Check the operation of the control valve
Lubricating oil too thick
Run the engine at operating temperature
Lubricating oil diluted with fuel
Check lubricating oil for dilution
©
200416
7-3
Engine brake, XE/PE engine
DIAGNOSTICS
ΧΦ65/75/85 series
4
1
Air bubbles in the oil
Check the engine's oil level/oil specification
Oil duct sealing plugs in DEB housing
Clean/replace sealing plugs
SYMPTOM: DEB OPERATES IRREGULARLY
Possible cause
Remedy
DIAGNOSTICS
7-4
©
200416
Engine brake, XE/PE engine
1
ΧΦ65/75/85 series
4
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