Maintenance Manual of 4M11 Series Diesel Engine For Land Power Generators
107
voltage. The alternator regulator, rectifier bridge,
stator, or internal connection may be malfunctioned
and need repair or replacement.
b) Low charging voltage
Malfunction 2: Low charging voltage
Vehicle symptom Fault Detection Solution
The battery is frequently
charged insufficiently, with
low charging voltage, and its
voltage drops significantly
when being loaded.
Understand whether the
alternator output power is
reasonably matched with the
electric devices of vehicle.
The measurement of alternator terminal B+
voltage shall be at 27.8~28.4V. If the
voltage is normal, it indicates that the
voltmeter or voltmeter sampling point is
malfunctioned and needs to be repaired or
replaced.
Check voltmeter for damage.
Check the alternator speed.
It’s recommended that the no-load idling
speed of alternator is higher than 1600RPM.
When the alternator is working under high
power load condition (for instance, the air
conditioner is switched on), the alternator
speed shall be ≥2000rpm or the voltage
shall be approximately 27V.
Check the drive belt quality and
tension for alternator and related
gear system.
Check the quality of belts for alternator and
relevant pulley systems and replace any
burnt, ruptured, distorted belt or the belt
with tooth breakage or the belt dropping to
the bottom of groove.
Re-tension the alternator and relevant
pulley systems.
★
Notice: For the systems with double
drive belt, replace both belts in event of
replacement.
Check alternator pulley. Tighten if loosened.
Check wires for reasonable use
and measure voltages at
alternator and battery terminals.
If the voltage difference is higher than 1V
(high voltage drop due to thin wires) under
heavy-load condition, replace the wires.
S≥6mm
2
within 35A S≥12mm
2
within 70A
S≥20mm
2
within 100A S≥25mm
2
within
150A
If the wire or connector has clear
temperature rise under heavy-load working
condition, replace the wire or connector.
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