The IHI 25NX is a popular mid-size compact excavator in the NX series. Proper maintenance is essential for reliability, performance, and longevity. Below is a clear summary of the official maintenance intervals, lubrication chart, and recommended lubricants.Key Highlights – IHI 25NX Maintenance
- Engine oil capacity: Max 4.5 L
- Hydraulic system: Total 43 L (Tank 30 L)
- Travel drive oil: 0.5 L per side (25NX)
- Swing gear grease: 4.0 L (25NX)
- Daily checks focus on engine oil, coolant, hydraulic level, and air cleaner indicator
- Grease all attachment pins and swing bearing every 50 hours
- Engine oil & filter change every 250 hours
- Hydraulic oil change every 1000 hours (or 600 hours with breaker use)
- Use EP-2 Lithium Grease for all grease fittings
- Shorten intervals in dusty conditions or when using a hydraulic breaker
IHI 25NX Maintenance Intervals Chart
Interval | Check Point | Item | Action | Key Notes |
|---|---|---|---|---|
When Required | Tracks | Check and Adjust Tension | Grease + Adjust | 10–20 mm sag (rubber tracks) |
When Required | Tracks | Check Rubber Shoes | Inspect / Replace | Replace if lugs < 5 mm |
When Required | Fuses / Fusible Link | Replace | Replace same rating | Fuse box on instrument panel |
When Required | Battery | Clean and Check Electrolyte Level | Clean + Top-up | Blue = Good |
When Required | Bucket | Change Bucket / Teeth | Replace as needed | Block bucket before work |
Daily (8 hrs) | Engine Oil | Check Oil Level | Check (E ○) | Stop engine first |
Daily (8 hrs) | Engine Coolant | Check Coolant Level | Check (W ○) | Check reserve tank |
Daily (8 hrs) | Hydraulic Tank | Check Hydraulic Oil Level | Check (H ○) | Machine level + retracted |
Daily (8 hrs) | Fuel Tank | Check Fuel Level | Check | Lock cap after refueling |
Daily (8 hrs) | Air Cleaner | Check Service Signal | Check indicator | Red = service needed |
Daily (8 hrs) | Water Sedimenter | Check Level and Drain Water | Drain if needed | Daily |
Every 50 hrs | Fuel Tank | Drain Water and Sediment | Drain | Fill tank first |
Every 50 hrs | Attachment Pins | Lubricate with Grease | Grease (G ○) | All pins |
Every 50 hrs | Swing Bearing | Lubricate with Grease | Grease (G ○) | Including ring gear |
Every 50 hrs | Engine | Change Oil and Filter * | Change (E ●) | *Initial break-in only |
Every 50 hrs | Hydraulic System | Change Return Filter * | Change | *Initial break-in only |
Every 250 hrs | Engine | Change Oil and Filter | Change (E ●) | Full service |
Every 250 hrs | Air Cleaner | Clean or Change Filter Elements | Clean / Replace | Max 5 cleanings |
Every 250 hrs | Fuel Filter | Clean Filter Element | Clean | — |
Every 250 hrs | Fan Belt | Inspect and Adjust | Check tension | — |
Every 250 hrs | Coolant | Change Coolant (non-LLC) | Change (W ●) | Or every 6 months |
Every 500 hrs | Bolts | Retighten Critical Bolts | Torque to spec | Use torque tables |
Every 500 hrs | Return Filter | Change Return Filter | Change (H ●) | Every 100 hrs with breaker |
Every 500 hrs | Fuel Filter | Change Filter Element | Change | — |
Every 500 hrs | Travel Drive | Check Oil Level | Check (L ○) | Both sides |
Every 1000 hrs | Travel Drive | Change Gear Case Oil | Change (L ●) | 0.5 L per side (25NX) |
Every 1000 hrs | Hydraulic Tank | Change Hydraulic Oil + Clean Strainer | Change (H ●) | 43 L total. 600 hrs with breaker |
Every 2 Years | Engine Coolant | Change Coolant (with LLC) | Change (W ●) | Full flush recommended |
IHI 25NX Lubrication Chart
Check Point | Item | Daily | Every 50h | Every 250h | Every 500h | Every 1000h | Symbol |
|---|---|---|---|---|---|---|---|
Attachment pins | Lubricate with grease "G" | — | ○ | — | — | — | G |
Hydraulic tank | Check oil level "H" | ○ | — | — | — | ● | H |
Return filter | Change filter | — | — | ● | — | — | H |
Engine | Change engine oil "E" | ○ | — | ● | — | — | E |
Engine | Change oil filter | — | — | ● | — | — | E |
Engine | Check coolant level "W" | ○ | — | — | — | ● | W |
Swing bearing | Grease bearing & ring gear | — | ○ | — | — | — | G |
Travel drive | Check / Change oil "L" | — | — | ○ | — | ● | L |
Blade | Lubricate with grease "G" | — | ○ | — | — | — | G |
Symbol Key
G = EP-2 Lithium Grease L = Gear Oil H = Hydraulic Fluid E = Engine Oil W = Coolant
○ = Check / Grease ● = Change
IHI 25NX Recommended Lubricants & Capacities
Location | Capacity | Change Interval | Recommended Lubricant |
|---|---|---|---|
Engine Oil | Max 4.5 L / Min 3.1 L | 250 hrs (initial 50 hrs) | API CD SAE 20/30/40 |
Hydraulic Oil | Total 43 L / Tank 30 L | 1000 hrs (600 hrs with breaker) | ISO-VG 46 or ISO-VG 32 |
Travel Drives (25NX) | 0.5 L each | 1000 hrs | API CD SAE 30 |
Track Rollers | 0.025 L each | As needed | Gear Oil ISO-VG 320 (SAE 90) |
Front Idlers | 0.075–0.08 L each | As needed | Gear Oil ISO-VG 320 (SAE 90) |
Swing Gear Grease (25NX) | 4.0 L | 1000 hrs | EP-2 Lithium Grease |
Grease Points | As required | Every 50 hrs | EP-2 Lithium Grease |
Coolant | — | 2 years (with LLC) | Long-Life Coolant (30–50% mix) |
Quick Tips for IHI 25NX Owners
- Always complete previous service items before moving to the next interval.
- Use the hour meter as the main guide — not calendar time.
- Regular greasing and correct track tension greatly extend undercarriage life.
- Breaker users should change hydraulic oil and return filter more frequently.
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