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 |
Same engine, other brands
2 brandsThe Cummins/Onan QSB5-G3 NR3 in this set also powers 2 generator sets sold under 2 other brands. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.
| Brand | Models |
|---|---|
| Cummins/Onan | DSFAE |
| Magnum | MMG100C Super Start |
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 is the dry weight of the Terex T120C?
The Terex T120C has a dry weight of 2445 kg (5390 lb).
What voltage does the Terex T120C produce?
The Terex T120C is offered in 208 V, 220 V, 240 V, 440 V, 480 V, 3 phase,1 phase-phase.
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 |
| No generator output voltage | Voltage regulator | Check voltage regulator wiring |
| No generator output voltage | Defective voltage regulator | Replace voltage regulator |
| No generator output voltage | Defective Selector Switch | By pass by hardwiring generator |
| No generator output voltage | Defective generator | Refer to generator manual |
| Low generator output voltage | Voltage adjustment set too low | Adjust voltage potentiometer |
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 (67 entries) →
Parts
11| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 100-001 | Air Filter | 1 | Air filter | Amazon Amazon eBay eBay |
| 100-002 | Oil filter | 1 | Oil filter | Amazon eBay |
| 100-003 | Fuel filter | 1 | Fuel filter | Amazon eBay |
| 100-004 | Air Filter | 1 | Air filter | Amazon Amazon eBay |
| 100-005 | Air Filter Element | 1 | Air filter | Amazon Amazon eBay $8.98 eBay NAPA $34.86 |
| 100-006 | Spark Plug | 1 | Spark plug | Amazon eBay |
| 100-007 | Battery | 1 | Battery | 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 |
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 |
Available documents
This page was generated from the 1 manufacturer document above by automated extraction; every figure shown is copied from one of them. How the data is compiled.