1. File & Identity Verification — Confirm “Who It Is” First
Inspection starts with paper, not with the engine.
- Nameplate & model: verify the model code and serial number on the boom root / swing platform against the seller’s documents. JetsMeta models in range (e.g. HW60 / HW220 / HW22D / HWL80) must match the paperwork exactly.
- Hour-meter reading: the core basis for used-machine pricing, but also the easiest item to tamper with (see Section 9).
- Original certificates & import documents: machine sources in Indonesia are complex — confirm certificate of origin, import declaration and tax documents are complete, to avoid compliance risk at registration, resale or project acceptance.
- Service records: regular oil and filter changes tell more than “looks new”.
2. Appearance & Structure — Check Whether the “Skeleton” Is Damaged
- Boom & arm welds: focus on root and hinge-area welds for re-welding, cracks or rust-through. Re-weld marks often mean prior overload or structural damage.
- Frame & swing bearing: check the X-frame for deformation; verify swing bearing bolts are complete and not leaking.
- Covers & cab: large-area new sheet metal may be hiding an accident; cab glass and seal condition reflect storage environment.
- Rust grade: coastal / mining salt spray is heavy in Indonesia — inner structural rust matters more than the exterior.
3. Powertrain — The Engine’s “Breathing” Talks
Exhaust smoke colour at start-up is the cheapest diagnostic signal:
- Blue smoke: burning oil, pointing to piston rings, valve seals or turbocharger seal failure.
- White smoke (apart from brief cold-start): possible head gasket leak, water in fuel or injection timing fault.
- Black smoke: incomplete combustion, commonly from clogged air filter, injection pump calibration drift or reduced turbo efficiency.
- Idle & throttle: idle should be steady with no surging; sudden throttle hesitation with knocking needs caution.
- Coolant & oil: check for emulsification (oil-water mix), abnormal oil level, radiator blockage.
Note: emission tier varies by model and build year. At purchase, verify against the nameplate and local compliance requirements, not marketing claims.
4. Hydraulics — The Machine’s “Muscle” Must Not Be Soft
Hydraulics are half the value of an excavator.
- Main pump noise: metal-on-metal friction or high-frequency squeal indicates internal wear or cavitation.
- Cylinder drift: a lifted rod slowly retracting on its own is internal leakage — abnormal.
- Lines & fittings: check hard lines for dents, hoses for bulges/leaks, seal integrity at joints.
- Combined motions: simultaneous swing + boom + arm should be smooth with no slowdown (see Section 8 test run).
5. Travel & Undercarriage — The “Four Rollers and One Track” Decide Mobility Cost
- Track tension: too loose derails easily, too tight accelerates wear; check tension cylinder for leaks.
- Bottom & carrier rollers: check each for leaks or seizure — one failed roller accelerates track wear.
- Track pitch: measure pitch elongation with calipers; over spec means undercarriage end of life — the costliest hidden replacement on a used machine.
- Idler & tension spring: condition directly affects slope and soft-ground capability.
6. Electrical & Controls — Don’t Ignore the “Nervous System”
- Gauges & alarms: all self-check lights should go out after power-on; any steady fault code — read it before negotiating.
- Pilot system: levers should be light with no sticking; combined-motion ratio linear.
- A/C & seals: in Indonesia’s heat and humidity, cab A/C and door/window seals directly affect operator endurance and equipment resale.
- Wiring & connectors: under mining dust and humidity, harness aging and connector oxidation are high-incidence hidden faults.
7. Indonesia-Specific Checks — The “Local Questions” Beyond the Generic List
- Humid-circuit anti-corrosion: check connector joints, ECU bay and battery terminals for green oxidation rust.
- Mud & water sealing: if used in swamp / paddy, check final-drive seals, float chamber, air-intake height.
- Mining dust: air-filter restriction indicator, hydraulic-tank breather, radiator fin cleanliness decide non-stop capability in hot season.
- Post-sea-freight idle: after inter-island transport machines may sit for weeks — rubber hardening, battery discharge, grease separation all need reset.
8. Test Run — Let the Machine “Confess Itself”
Paper looks good, but run it on site:
- Combined-motion test: simultaneous swing + boom + arm + travel — watch for slowdown or stalling.
- Full-load digging: full bucket in hard soil / gravel — listen to the pump, watch smoke, feel swing braking.
- Climb & brake: slope parking brake must be reliable, no rollback downhill.
- Swing bearing: no abnormal play or metal scraping during swing.
9. Hour Meter & Value — Why “Indicated” Hours Can’t Be Fully Trusted
The hour meter can be rolled back — an open secret in the used market. Cross-verify:
- compare service records, filter-change frequency against indicated hours;
- observe seat / lever wear, track or tyre actual wear against the hour count;
- read engine ECU internal runtime (if available) versus the meter.
Indicated hours are only a starting reference, never the sole pricing basis.
10. Conclusion — Make Inspection a Fixed Routine
Whether new or used, a ticked inspection checklist is essentially insurance on your purchase decision. Indonesia’s operating conditions mean local-specific checks must be layered on top of the generic list.
If you are comparing specific models (e.g. a 6-ton crawler, a 22-ton mining excavator, or a small wheel loader / dozer), send us the target model — we can refine the inspection focus based on that model’s structural characteristics.
For model-specific inspection points or in-stock machine data, contact us on WhatsApp, or follow our Facebook page Machine Biz Indonesia for practical Indonesia job-site content.
Frequently Asked Questions
What to check first when buying a used excavator?
Start with paperwork and hours: verify the nameplate model code, serial number, and original/import documents, then cross-check the hour-meter reading against service records. Only after the papers line up should you move to the physical inspection.
What does blue smoke from the engine mean?
Blue smoke is a classic sign of oil burning, typically from worn piston rings, hardened valve seals, or a failed turbocharger seal. Observe exhaust on both cold start and at operating temperature before purchase.
Is hydraulic cylinder drift normal?
No. If a lifted cylinder slowly retracts on its own, it indicates internal leakage that needs repair and will directly affect digging force and control precision.
How do I judge track wear?
Measure the track-chain pitch elongation with calipers - exceeding spec means the undercarriage is near end of life. Also check each bottom roller and carrier roller for leaks or seizing, and inspect track plates for cracks. The undercarriage is the costliest hidden replacement on a used machine.
What to watch for on machines after sea freight in Indonesia?
After inter-island shipping machines often sit for weeks - expect battery discharge, hardened rubber, separated grease, and salt-spray corrosion at connectors. On arrival, run a self-check, refresh fluids, then test-operate.
Can the hour meter be tampered with?
Yes. Used-machine markets see hour meters rolled back. Cross-check against service frequency, actual seat/lever wear, track wear, and the engine ECU internal runtime if available.
What matters most when inspecting a machine for mining sites?
Structural fatigue (boom/arm welds, frame), cooling (radiator fin cleanliness, water temp), air-filter restriction indicator, and hydraulic tank breather - summer non-stop capability drives mine output.
How does inspection differ between new and used machines?
New machines: focus on build quality, accompanying documents, nameplate consistency, first break-in. Used: focus on wear, hour-meter authenticity, hidden repair history. Both require a test run, but the risk points differ.