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Fav 900
Electrics / Starter motor system
Troubleshooting table for M011 - starter, 24 V starter motor
B
Faults
07.08.2001
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Troubleshooting table for M011 - starter, 24 V starter motor
Text-module
Note:
UB30 for S002 - switch, ignition see
Chapter 9000 Reg. C - Electric circuit diagrams (power UB)
Note:
Chapter 9000 Reg. A - Terminal designation to DIN 72 552
Text-module
Fault: when switching on, starter shaft does not rotate or rotates too slowly
Cause
Remedy
F028 fuse in X050 defective
Change fuse (40 amps)
G001, G003 - battery discharging
Charge battery
G001, G003 - battery defective
Test with battery tester, fit new battery if necessary
Battery cable clamps are loose, oxidised, poor
earth connection.
Tighten cable clamps, clean terminal head cable
clamps and grease with acid-proof grease.
Starter terminals or brushes have short-circuit to
earth.
Eliminate short-circuit to earth.
Starter carbon brushes are not in contact with com-
mutator, are jammed in their guideways, are worn,
broken, oil-covered or soiled.
Inspect, clean or fit new carbon brushes; if neces-
sary, clean guideways in brush holders.
S002 - switch, S012 - switch, K008 - relay, K018 - re-
lay damaged. (Components loose so switch or re-
lay does not switch on, burned-out)
Check switch, relay; fit new one, if necessary.
Relay of M011 - starter damaged
Have starter repaired in specialist workshop.
Voltage drop in cables excessive, cables damaged,
cable connections loose. Terminals and plug-and-
socket connections oxidised.
Inspect starter cables and their connections.
Fault: rotor rotates, but pinion does not engage
Cause
Remedy
Pinion bearing clogged
Clean bearing point and lightly oil.
Mechanical damage to pinion or gearwheel, burrs File burrs down; if necessary, fit new pinion and ge-
arwheel.
Fault: when switching on, starter rotor rotates, pinion engages properly, but engine does not
turn over
Cause
Remedy
G001, G003 - battery insufficiently charged
Charge G001, G003 - battery
Inadequate carbon brush pressure
Inspect, clean or fit new carbon brushes.
Starter relay or K018 - relay defective
Check relay for continuity.
Excessive voltage drop in cables
Inspect cables and their connections.
Freewheeling clutch slipping
Have freewheeling clutch repaired in specialist
workshop.