Regular maintenance is essential to maximise your mini excavator's lifespan and avoid costly breakdowns. A well-maintained machine lasts 8,000 to 12,000 hours — 15 to 20 years at 500 to 600 hours a year. A neglected one, by contrast, can suffer an unrepairable failure as early as 1,500 to 2,000 hours.
The cost of well-kept maintenance over 3 years is around €500 to €900 in parts — compared with the €5,000 to €15,000 a major failure (hydraulic pump, engine) can cost.
Maintenance schedule by interval
Before each use (daily)
- Engine oil level: check with the dipstick, top up if needed
- Hydraulic oil level: tank sight glass or dipstick
- Fuel level: never run it dry (risk of air in the circuit)
- Coolant: when cold, in the expansion tank
- Track tension: a track that is too loose can come off
- Visible hydraulic hoses: no leaks or abrasion
- Safety devices: seat and arm lock working
Every 8 to 10 hours
- Grease the arm joints (boom, dipper, bucket — EP2 lithium grease)
- Grease the blade joints
- Grease the slew ring (rotation bearing)
Every 50 hours
- Check/clean the air filter
- Check the alternator belt (tension, cracks)
- Play in the pivot pins
- Tightness of the track shoe bolts
- Hydraulic filter clogging indicator
Every 100 hours
- Drain the water/fuel separator
- Check the valve clearance (Laidong, KOOP engines)
- Check the hydraulic pressure
Every 200 to 250 hours
- Full engine oil change (warm) + oil filter replacement
- Replace the fuel filter and air filter
- Clean the radiator with compressed air (reverse direction)
Every 500 hours
- Replace the hydraulic filter (return + pilot)
- Change the oil in the travel and slew reduction gears
- Full inspection of the hydraulic hoses
Every 1,000 hours (or annually)
- Full hydraulic oil change + tank flush
- Replace the coolant
- Check the welds and structure (arm, boom, chassis)
- Overhaul the cylinders (rod seals)
Recommended oils and lubricants
| Circuit | Specification | Quantity |
|---|---|---|
| Engine oil | 15W-40 API CF-4/CG-4 | 2.5 to 4.5 L |
| Hydraulic oil | ISO VG 46 anti-wear (HM46) | 18 to 35 L |
| Travel reduction gear | SAE 90 EP GL-4 | 0.2 to 0.5 L / gear |
| Slew reduction gear | SAE 90 EP GL-4 | 0.3 to 0.6 L |
| Joint greasing | EP2 lithium grease (NLGI 2) | Variable |
| Cooling | Water + antifreeze 50/50 | 3 to 6 L |
The exact quantities are in your machine's service log.
Common problems and troubleshooting
Engine overheating
Stop the machine immediately if the temperature exceeds the warning threshold. Common causes: low coolant level, clogged radiator, broken/loose fan belt, faulty thermostat, or prolonged full-power use in hot weather (take breaks every 2 h in summer).
Hydraulic leaks
Oil stains, a dropping level or loss of power. Causes: a cylinder rod seal, a damaged hose (replace immediately — risk of high-pressure spray), a loosened/cracked fitting, or a pump seal.
Starting difficulties
Flat battery (the no. 1 cause, especially in winter), clogged fuel filter, air in the circuit (bleed it), faulty glow plugs, or oil that is too thick (switch to 5W-30/10W-30 below 0 °C).
Loss of digging power
Check, in order: hydraulic oil level, working pressure, filter condition. A pressure below 200 bar points to a pump or relief-valve problem.
Winterising and storage
For storage of more than 4 weeks:
- Full engine oil change (used oil is acidic and attacks the seals)
- Check the antifreeze (−25 °C protection recommended)
- Fill the fuel tank to 100% (prevents condensation)
- Grease all joints generously
- Retract the cylinder rods (anti-corrosion)
- Set the machine on blocks (relieves the tracks)
- Disconnect the battery or use a trickle charger
- Cover with a breathable tarpaulin
On restart: reconnect the battery, check the levels, let it idle for 5 minutes, then make slow arm movements to warm up the oil.
Track maintenance
Rubber tracks are wear parts (1,500 to 3,000 hours depending on the ground). A correctly tensioned track has 10 to 15 mm of sag at the lowest point. Adjust via the greasing valve (add to tighten, bleed to loosen). Wear indicators: lugs under 5 mm, deep longitudinal cracks, visible steel cords (urgent replacement). Cost of a pair: €300 to €800 depending on size.
Hydraulic circuit maintenance
Rigorous monitoring prevents 80% of hydraulic failures. The oil should stay clean and light amber: black = overheating/mixing, milky = water present. If you hear knocking (cavitation) or notice jerky movements, bleed the air by slowly working all movements at idle. A hose in good condition lasts 4 to 6 years: replace any swollen, cracked, abraded or leaking hose, without waiting for it to burst.
Replacing the filters
Engine oil filter: warm engine, full oil change, unscrew, fit a new lubricated seal, hand-tighten + 3/4 turn (never with a wrench), refill, check for leaks. Air filter: do not use compressed air inside the housing, respect the cartridge orientation. Hydraulic return filter: cold machine, depressurised circuit, lubricated seal, hand-tighten + 1/2 turn, check the level.
Maintenance cost over 3 years
For a mini excavator at 400 h/year (regular trade use):
| Operation | Frequency | 3-year cost |
|---|---|---|
| Engine oil change + oil filter | 250 h | ~€240 |
| Air filter | 200 h | ~€80 |
| Fuel filter | 250 h | ~€80 |
| Hydraulic filter | 500 h | ~€130 |
| Hydraulic oil | 1,000 h | ~€100 |
| Grease | Ongoing | ~€90 |
| Coolant | Annual | ~€60 |
| Contingencies | Variable | ~€150 |
Estimated total: €900 to €1,200 excl. VAT over 3 years in parts (excluding labour if you do the maintenance yourself), i.e. ~€25 to €35/month. CZN delivers every machine with a free starter kit (first-service filters + grease).
A technical question about maintenance?
Our after-sales team in Toulouse supports you by phone and provides a service log tailored to your model.
Our after-sales support
Every machine comes with a detailed service log (intervals and specifications tailored to the model). The Toulouse technical team supports you by phone. In the event of a breakdown, we operate across France with a permanent parts stock — most jobs are resolved in under 5 business days. Under warranty (24 months), call-out and labour are fully covered. Beyond that, annual maintenance contracts are available.