2013 — 2017
Yanmar 4TNV88-B - 2.19L 4-cylinder diesel
Diesel
Operate the boom, arm, and bucket simultaneously through their full range of motion. Listen for any shuddering or hesitation which might suggest hydraulic pump wear or pressure relief valve irregularities.
Track the machine in a straight line for at least 20 meters on flat ground. Observe if it pulls significantly to one side, which could indicate unequal track motor performance or tensioner issues.
Engage the swing function while stationary. Look for excessive 'slop' or play in the slew ring bearing, as this can be a significant mechanical focus area on machines with high hours.
Check the engine exhaust color under a load. While some light smoke is common for diesel machinery, persistent heavy black or blue smoke might suggest it is time to have a technician review the fuel injectors or engine blow-by.
The initial 'settling-in' period is over; check for wear on pins and bushes and ensure all hydraulic hoses have been inspected for weathering.
A critical service interval where undercarriage integrity and cooling system efficiency should be carefully monitored.
At this stage, it's wise to plan for a more comprehensive inspection of the Yanmar engine’s ancillaries and main hydraulic pump performance.
Keep a regular eye on your hydraulic fluid levels and ensure they are changed according to the schedule to protect the pump.
Regularly clear debris from the radiator and oil cooler screens, as these machines can get quite warm during our NZ summers.
Check track tension frequently; having them set correctly saves a lot of unnecessary wear on the rollers and idlers.
Grease the pins and bushings daily; it’s the easiest way to keep the machine operating smoothly and avoid future rattle.
Monitor the engine air filter indicator; keeping the intake clean is vital for the Yanmar engine's longevity and fuel economy.
Estimated repair costs if issues arise
If the tracks and rollers have reached the end of their service life, you might eventually need to budget for a full undercarriage kit to ensure the machine remains stable on site.
If this component shows signs of flagging pressure in the future, the estimated cost in NZ to have it assessed or professionally rebuilt is something to keep in your long-term maintenance fund.
Depending on the intensity of the work history, you might eventually need to budget for professional labor and parts to address play in the slew bearing.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer