Direct answer
If an excavator still overheats after cooler cleaning, record exactly what was cleaned and preserve the temperature warning and operating context. Cleaning one area does not verify the whole cooling system. The next step is a structured technical assessment, not automatically another radiator, thermostat or water pump.
Define the cleaning work and the remaining complaint
Keep the original service entry: which cooler surface was accessible, what procedure was used, whether any damage was recorded and when the warning returned. Distinguish an observed display warning from a technician-confirmed temperature measurement. Preserve the exact warning text and any available indication; do not substitute an assumed “normal” temperature from another machine.
What to record before a service or parts decision
| Record | What to include and why |
|---|---|
| Complaint | Exact warning, displayed value with units if available, and time first observed. |
| Work completed | Component/area cleaned, service date, approved method and any unresolved findings. |
| Operating context | Known ambient conditions, work/load and duration before the original event; avoid unsafe reproduction. |
| Cooling history | Fluid service, leaks or repairs already recorded; identify the engine and machine serial. |
| Next assessment | Technician findings on the relevant airflow, coolant-system and indication checks, with source and conditions. |
What the observations do—and do not—establish
Airflow condition, coolant-system condition and the validity of the indication are separate assessment questions. A clean exterior does not answer all three. The technician should decide which checks the installed system requires and record their basis. A change after cleaning is useful history, but it is not by itself proof of the underlying fault. Avoid ranking possible causes without evidence.
Turn the record into a clear service handoff
Ask the service team to document whether the complaint remains, what checks were completed and what remains unresolved. When a part is proposed, obtain the exact component identity and the evidence supporting replacement. Keep the cleaning history attached so the next person does not repeat the same work without knowing what it covered.
Safe limits for this guide
Follow the machine’s overtemperature response. Do not continue loading the machine to recreate the event, open a hot cap, remove guards around running equipment or handle pressurized coolant. Qualified personnel must define any controlled testing.
Machine and parts context
This is a general service-planning guide. The linked machine pages organize identification information; they do not make the workflow a model-specific repair procedure.
Frequently asked questions
Does a clean radiator rule out a cooling problem?
No. It describes only the work and area actually checked.
Should I replace the thermostat immediately?
A component decision needs evidence from the applicable assessment.
What is the correct temperature limit?
Use the specification and warning definition for the exact machine and engine; this guide gives no universal limit.
Sources and scope
- Komatsu parts and documentation access — Manufacturer route to machine-specific parts and service documentation. This portal does not supply the individual limits or application approval for this guide.
- Caterpillar engine summer maintenance — General cooling-component inspection background only; no Komatsu coolant specification, limit or interval is taken from this page.
The observation checklist is Danch Machinery editorial guidance. No customer case, measured result or technician sign-off is claimed. Published or updated 14 September 2026. Obtain the current documentation for the exact machine before any technical procedure.
Request a parts identification check
Send the complete model and serial, component position, exact number or clearly marked uncertainty, quantity and available service findings. Danch Machinery supplies genuine parts; a quotation does not replace a technical diagnosis.
About this guide
Published by Danch Machinery as general parts-identification and service-planning information. It is not a signed technical inspection or a machine-specific repair approval. Refer to the sources and scope stated in the article; confirm service procedures and fitment with the current manufacturer documentation for the exact machine.
Machine configurations and service requirements can differ by model, serial number and market. Confirm procedures and fitment with the current manufacturer documentation for your exact machine.
