Specifications
| Fuel | diesel |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 100 kW |
| Standby kVA | 125 |
| Prime power | 96 kW |
| Oil capacity | 12.1 L |
| Alternator | Stamford/AvK UCI274DIL32D |
| Voltage options | 208 V, 220 V, 240 V, 440 V, 480 V |
| Phase | 3 phase,1 phase |
| Rated current | 350 A |
| Power factor | 0.8 |
| Circuit breaker | 350 A |
| Dimensions (L×W×H) | 2790×1190×1620 mm |
| Dry weight | 2445 kg |
| Sound level | 68.0 dBA @ 7 m |
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 | — | 250 hr | find | ||
| Fuel filter | — | find | |||
| Oil filter | — | 1500 hr | find | ||
| Belt | — | find | |||
| Coolant | — | ||||
| Oil | — |
Compatible filters for the Cummins/Onan QSB5-G3 NR3 — cross-referenced via Donaldson. Options to verify against your serial number, not confirmed for this exact unit.
- Air filter: Donaldson P635903 Donaldson P635979
Common questions
What is the power rating of the Terex T120?
The Terex T120 is rated 100 kW standby (125.0 kVA).
What engine does the Terex T120 use?
The Terex T120 is powered by the Cummins/Onan QSB5-G3 NR3 engine.
What fuel does the Terex T120 use?
The Terex T120 runs on diesel.
What is the oil capacity of the Terex T120?
The Cummins/Onan QSB5-G3 NR3 engine in the Terex T120 has an oil capacity of 12.1 liters.
What alternator does the Terex T120 use?
The Terex T120 uses a Stamford/AvK UCI274DIL32D alternator.
Troubleshooting
14Symptoms & 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 | |
| Fluctuating generator output voltage stability | Load may be the cause | Redistribute load if possible |
| Engine won't crank | Loose battery cable | Check cables and battery electrolyte level. Recharge as necessary |
| Engine runs, but loses power under load | Clogged fuel system | Check fuel system |
| Engine shuts down | Oil Pressure Switch not opening automatically and TROUBLE LIGHT on | Improper coolant use a 50/50 on |
| TROUBLE LIGHT on CONTROL PANEL is illuminated | Broken fan belt | Inspect fan belt and replace as needed |
| Voltage does not come up to the rated voltage | Internal problem with the generator end | Check for even reading across the lines, if they are not this would mean you probably have a problem with the wiring of the switch or generator. If the generator voltage reads correctly, contact the TEREX service department. |
| Uneven reading between the legs when applying 24 volts to the field wires | Recheck your wiring connections. After you have the field wire connected start the unit again and check your output voltage. It may still be necessary to flash the fields to restore residual voltage. | |
| Malfunction discovered | Identify symptoms, troubleshoot, perform repair, return to service |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
24| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 100-001 | Air Filter | 1 | Air filter | PartsGeek dieselpartscenter $75.38 |
| 100-002 | Oil Filter | 1 | Oil filter | PartsGeek dieselpartscenter $78.44 |
| 100-003 | Fuel Filter | 1 | Fuel filter | PartsGeek |
| 100-004 | Coolant Filter | 1 | Coolant filter | PartsGeek |
| 100-005 | Belt | 2 | Belt | PartsGeek kuduparts $239.99 |
| 100-006 | Spark Plug | 1 | Spark plug | PartsGeek |
| 100-007 | Battery | 1 | Battery | PartsGeek kuduparts $153.00 |
| 100-008 | Thermostat | 1 | Thermostat | PartsGeek |
| 101-4000 | Gasket | 385 | Gasket | PartsGeek |
| 125550 | Oil Filter | Oil filter | PartsGeek | |
| 125551 | Fuel Filter | Fuel filter | PartsGeek | |
| 125552 | Belt | Belt | PartsGeek | |
| 125561 | Air Filter - Primary | Air filter | PartsGeek | |
| 125562 | Air Filter - Secondary | Air filter | PartsGeek | |
| 127-0826 | Battery | 685 | Battery | PartsGeek |
| 153-5720 | Thermostat | 147 | Thermostat | PartsGeek |
| 250-0486 | Oil Filter | 34 | Oil filter | PartsGeek |
| 250-0488 | Spark Plug | 31 | Spark plug | PartsGeek |
| 362PSL1606 | Generator Model | Generator | PartsGeek | |
| 8C-3600 | Coolant Filter | 375 | Coolant filter | PartsGeek |
| 8C-3601 | Air Filter | 250 | Air filter | PartsGeek |
| 8C-3620 | Belt | 350 | Belt | PartsGeek |
| 8C-3627 | Fuel Filter | 30 | Fuel filter | PartsGeek |
| 134277 | T70, T90 & T120 Super Quiet Generator Maintenance Schedule | Service part / kit | PartsGeek |
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
Service manual — 134277 (Terex)