A 36-tonne production excavator where undercarriage, main hydraulics, and final drives dwarf every other cost. Measure, don't eyeball.
The 336 is a heavy production machine that earns its keep in mass excavation, so it tends to accumulate hard hours. The big-ticket systems are the undercarriage, the main hydraulic pumps and valve, and the final drives, and all of them wear in ways a walk-around won't reveal.
Tracks, rollers, idlers, and sprockets are the dominant wear cost on a machine this size.
CHECK Measure component wear and estimate remaining life as a percentage.
Pump and valve wear shows up as slow cycles and cylinder drift.
CHECK Time the cycles, hold a load for drift, and check pressures against spec.
Final-drive and swing wear cause noise, leaks, and tracking issues.
CHECK Listen while tracking and swinging, check for case leaks, and sample the oils.
Cracks and re-welds at high-stress pivots indicate hard use.
CHECK Inspect welds and pivots for cracks and repairs.
Blowby and DPF/regen health vary with maintenance.
CHECK Check blowby, sample engine oil, and verify regen on Tier 4 machines.
Heavy-duty diagnostic laptop with OEM adapters & software · Hydraulic pressure test kit with assorted fittings · Undercarriage wear gauges · Pin & bushing wear measurement tools · Ultrasonic thickness gauge for structural steel & buckets · Infrared thermometer / thermal camera · Oil & fluid sampling kit for lab analysis · Digital borescope …
See the full Heavy Equipment Inspection tool kit →
Pre-tagged for the Caterpillar 336 Excavator (All series).