The IHI 45NX is a powerful and popular mid-to-large compact excavator. Following the recommended maintenance schedule helps maximize performance, reliability, and machine lifespan. Below is a clear and practical summary based on the official service manual.Key Highlights – IHI 45NX Maintenance
- Engine oil capacity: Max 8.1 L
- Hydraulic system: Total 84 L (Tank 55 L)
- Travel reduction gear oil: 1.0 L per side
- Swing gear grease: 11.5 kg
- Daily checks include engine oil, coolant, hydraulic level, fan belt, and air cleaner indicator
- Grease all attachment pins and swing bearing every 50 hours
- Engine oil and filter change every 250 hours
- Hydraulic oil change every 1000 hours (or every 600 hours with breaker use)
- Use EP-2 Lithium Grease for all grease points
- Shorten service intervals in dusty conditions or when using a hydraulic breaker
IHI 45NX Maintenance Intervals Chart
Interval | Check Point | Item | Action | Key Notes |
|---|---|---|---|---|
Daily (8 hrs) | Engine Oil | Check Oil Level | Check (E ○) | Stop engine first |
Daily (8 hrs) | Engine Coolant | Check Coolant Level | Check (W ○) | Reserve tank |
Daily (8 hrs) | Hydraulic Tank | Check Hydraulic Oil Level | Check (H ○) | Cylinders retracted |
Daily (8 hrs) | Fan Belt | Inspect / Adjust | Check tension | 10 mm deflection |
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 | Tracks | Check and Adjust Tension | Grease + Adjust | 10–20 mm sag |
Every 50 hrs | Fuel Tank | Drain Water and Sediment | Drain | — |
Every 50 hrs | Attachment Pins | Lubricate with Grease | Grease (G ○) | All pins |
Every 50 hrs | Swing Bearing | Lubricate with Grease | Grease (G ○) | — |
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 | Service Air Cleaner Element | Clean | — |
Every 250 hrs | Fuel Filter | Drain Water and Clean Element | Clean | — |
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 table |
Every 500 hrs | Return Filter | Change Return Filter | Change (H ●) | — |
Every 500 hrs | Air Cleaner | Change Filter Element | Replace | — |
Every 500 hrs | Fuel Filter | Change Filter Element | Replace | — |
Every 500 hrs | Travel Reduction | Check Oil Level | Check (L ○) | Both sides |
Every 1000 hrs | Travel Reduction | Change Gear Case Oil | Change (L ●) | 1.0 L per side |
Every 1000 hrs | Hydraulic Tank | Change Hydraulic Oil + Clean Strainer | Change (H ●) | 84 L total. 600 hrs with breaker |
Every 2 Years | Engine Coolant | Change Coolant (with LLC) | Change (W ●) | Full flush recommended |
When Required | Battery | Inspect | Clean + Check | — |
When Required | Tracks | Check Rubber Shoes | Inspect / Replace | Replace if lugs < 5 mm |
When Required | Fuses / Fusible Link | Replace | Replace same rating | — |
When Required | Bucket | Change Bucket / Replace Tooth | As needed | Block bucket before work |
IHI 45NX 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 | — | ○ | — | — | — | G |
Swing bearing (Ring gear) | Grease ring gear | — | — | — | ○ | — | G |
Travel reduction gear | 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 45NX Recommended Lubricants & Capacities
Location | Capacity | Change Interval | Recommended Lubricant |
|---|---|---|---|
Engine Oil | Max 8.1 L / Min 5.6 L | 250 hrs (initial 50 hrs) | API CD SAE 20/30/40 |
Hydraulic Oil | Total 84 L / Tank 55 L | 1000 hrs (600 hrs with breaker) | ISO-VG 46 or ISO-VG 32 |
Travel Reduction Gears | 1.0 L each | 1000 hrs | API GL-4 SAE 30 |
Lower Rollers | 80 cc each | As needed | Gear Oil ISO-VG 320 (SAE 90) |
Front Idlers | 75–80 cc each | As needed | Gear Oil ISO-VG 320 (SAE 90) |
Upper Rollers | 60 cc each | As needed | Gear Oil ISO-VG 320 (SAE 90) |
Swing Gear Grease | 11.5 kg | 1000 hrs | EP-2 Lithium Grease |
General Grease Points | As required | Every 50 hrs | EP-2 Lithium Grease |
Coolant | — | 2 years (with LLC) | Long-Life Coolant |
Quick Tips for IHI 45NX Owners
- Always complete previous service items before moving to the next interval.
- Use the hour meter as your main reference.
- Regular greasing and correct track tension are essential for protecting the undercarriage.
- Breaker users should change the return filter more frequently (every 100 hours) and hydraulic oil every 600 hours.
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