Field case study · Grantsville, UT
John Deere 624K loader overheating — Grantsville, UT
Coolant loss and high engine temps on a wheel loader at a Grantsville aggregate yard.
Reported symptom
Engine temperature climbing above 210°F during normal loading cycles. Coolant reservoir low with visible seepage around the radiator area.
Diagnostic finding
Cracked radiator tank end-cap (plastic side tank). Debris buildup in the radiator core reduced airflow, causing the crack to expand under heat cycles.
Repair scope
Removed and recored the radiator with a new aluminum end-tank assembly. Pressure-tested the cooling system. Cleaned the radiator fins and A/C condenser core. Refilled with CAT ELC coolant and burped the system.
Reported result
Operating temperature stabilized at 190°F under full load. No coolant loss after 4 hours of test operation. Preventative cleaning schedule recommended for the dusty yard environment.
What this case helps clarify
This job is a useful example of why the first reported symptom is only the starting point. The machine type, brand, location, operating conditions, and observed diagnostic finding all shape the repair path. A similar complaint on another model may require a different test sequence or a different field-versus-shop decision.
For a new service request, send the machine make and model, hours if known, warning codes or dashboard photos, the conditions that trigger the problem, and the safest access point at the jobsite. That information helps the technician prepare the right tools and determine whether the work can be performed where the machine sits.
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