Troubleshooting
Safety, Operation and Maintenance Manual - Aug 2012
6-3
SY115C9/135C/155H Crawler Hydraulic Excavator
Item
Judgement value
Remedy
Lubricating
oil, coolant
1. Check fuel level and type of fuel
2. Check for impurities in fuel
3. Check hydraulic oil level
4. Check hydraulic oil strainer
5. Check swing drive oil level
6. Check engine oil level (in oil pan)
7. Check coolant level
8. Check dust indicator for clogging
9. Check hydraulic
fi
lter
10. Check
fi
nal drive oil level
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Add fuel
Clean, drain
Add oil
Clean, drain
Add oil
Add oil
Add water
Clean or replace
Replace
Add oil
E l e c t r i c a l
equipment
1. Check for looseness and corrosion of battery termi-
nal and wiring
2. Check for looseness and corrosion of alternator ter-
minal and wiring
3. Check for looseness and corrosion of start motor
terminal and wiring
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Tighten or replace
Tighten or replace
Tighten or replace
H y d r a u l i c ,
mechanical
equipment
1. Check for abnormal noise and smell
2. Check for oil leakage
3. Carry out air bleeding
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Repair
Repair
Bleed air
Electrics,
electrical
equipment
1. Check battery voltage (engine stopped)
2. Check battery electrolyte level
3. Check for discolored, burnt, exposed wiring
4. Check for missing wiring clamps and hanging wiring
5. Check for water leaking on wiring (be particularly
careful attention to water leaking on connectors or
terminals)
6. Check for blown or corroded fuses
7. Check alternator voltage (engine running at 1/2
throttle or above)
8. Check operating sound of battery relay
(when switch is turned ON/OFF)
20-30V
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After running for
several minutes:
27.5~ 29.5V
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Replace
Add or replace
Replace
Repair
Disconnect con-
nector and dry
Replace
Replace
Replace
6 TROUBLESHOOTING
6.1 Troubleshooting Preparation
6.1.1 Checks before troubleshooting
Table 6-1