SY235 Excavator Unable to Start After Long-Term Parking

Item	Details
Fault Type	Engine Fault
Equipment Code	SY023BBHA7938
Model	SY235
Business Unit	Heavy Machinery Business Unit
Product Group	28/Excavator/Excavator
Operating Hours	5298H
Shutdown Fault	Yes
Location	United States of America
Public Status	Display
Service Order	—

Fault Description

SY235 excavator cannot start after being parked for a long time.

Fault Phenomenon

No response when starting.

Fault Cause

Starter motor damaged. Long-term non-use caused corrosion and internal seizure; drive gear failed to return and kept rotating with the engine, resulting in overheating and ablation.

Troubleshooting Process

1. Onsite inspection showed engine oil, hydraulic oil and coolant were at normal levels.
2. Turned ignition switch to ON; battery relay operated normally. Battery voltage was low, and no response occurred with external power supply.
3. Measured 24V at starter positive terminal; negative ground connection was normal.
4. With key at START position, 24V was present on 12# wire to starter relay, ruling out starting circuit fault. Starter motor was confirmed faulty.
5. Disassembled starter and found drive gear stuck with ablation; starter was unusable.
6. Replaced with new starter motor; fault eliminated.

Troubleshooting Experience

Long-term parked equipment should be operated regularly for rust prevention.