Service parts for the T120C
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
| Prime power | 96 kW |
|---|---|
| Oil capacity | 12.1 L |
| Voltage options | 208 V, 220 V, 240 V, 440 V, 480 V |
| Phase | 3 phase,1 phase |
| Rated current | 350 A |
| Circuit breaker | 350 A |
| Dimensions (L×W×H) | 2790×1190×1620 mm |
| Dry weight | 2445 kg |
Engine
| Oil capacity | 12.1 L |
|---|---|
| Displacement | 4.5 L |
| Aspiration | Turbocharged and air-to-air aftercooled |
| Rated speed | 1800 rpm |
Maintenance & consumables
for the Cummins/Onan QSB5-G3 NR3| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Filter - Primary | 125561 | Amazon eBay | ||
| Fuel filter | Fuel Filter | 125551 | Amazon eBay | ||
| Oil filter | Oil Filter | 125550 | Amazon eBay | ||
| Battery | — | ||||
| Belt | — | ||||
| Coolant | — | ||||
| Oil | — | ||||
| Spark plug | — |
Common questions
Which engine powers the Terex T120C?
The Terex T120C is powered by the Cummins/Onan QSB5-G3 NR3 engine.
What's the oil capacity on a Terex T120C?
The Cummins/Onan QSB5-G3 NR3 engine in the Terex T120C has an oil capacity of 12.1 liters.
What oil filter fits the Terex T120C?
The Terex T120C uses oil filter part number 125550.
What fuel filter fits the Terex T120C?
The Terex T120C uses fuel filter part number 125551.
Which air filter part number does the Terex T120C take?
The Terex T120C uses air filter part number 125561.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| No generator output voltage | Circuit breaker tripped | Reset circuit breaker |
| Low generator output voltage | Voltage adjustment set too low | Adjust voltage potentiometer |
| Low engine speed | Call TEREX Service | |
| Fluctuating or surging generator output voltage | Check engine fuel, oil, and air filters | |
| High generator output voltage | Voltage adjustment potentiometer set too high | Adjust potentiometer |
| High engine speed | Call TEREX Service |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Terex T120C troubleshooting guide (14 entries) →
Parts
12| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 100-001 | Air Filter | 1 | Air filter | Amazon Amazon eBay |
| 100-002 | Fuel Filter | 1 | Fuel filter | Amazon eBay |
| 100-003 | Air Filter | 1 | Air filter | Amazon eBay |
| 100-004 | Coolant Filter | 1 | Air filter | Amazon Amazon eBay |
| 100-005 | Belt | 1 | Belt | Amazon Amazon eBay $8.98 eBay KuduParts $239.99 |
| 100-006 | Spark Plug | 1 | Spark plug | Amazon eBay |
| 100-007 | Bolt (M10-1.5) | 1 | Bolt m10 1 5 | Amazon eBay KuduParts $153.00 |
| 100-008 | Bolt (M12-1.75) | 1 | Bolt m12 1 75 | Amazon eBay |
| 125550 | Oil Filter | Oil filter | Amazon eBay | |
| 125551 | Fuel Filter | Fuel filter | Amazon eBay | |
| 125561 | Air Filter - Primary | Air filter | Amazon eBay | |
| 362PSL1606 | Generator Model | Generator | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Fuel consumption
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 4.4 | 16.6 | |
| Prime | 50% | 3.4 | 13.0 |
| Prime | 75% | 5.0 | 19.0 |
| Standby | 5.6 | 21.0 | |
| Standby | 100% | 6.0 | 23.0 |