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Terex T70C Generator Set

The Terex T70C is a 80 kW (100 kVA) diesel standby generator set powered by a Cummins/Onan QSB5-G1 NR3 engine. It is available at 208 V, 220 V, 240 V, 440 V and 480 V, single-phase, 60 Hz and rated 225 A. It holds about 9 L (2.4 gal) of oil and 9 L (2.4 gal) of coolant, with a maximum ambient rating of 41 °C. The set measures 2790×1190×1620 mm (109.8×46.9×63.8 in) and weighs about 2445 kg (5390 lb). An integrated tank holds 606 L (160.1 gal), roughly 28 hours of runtime.

80 kW
Standby
4.5 L
Displacement
9.0 L
Oil capacity
1
Document types

Typical fuel consumption for 80–85 kW Diesel generators →

Compare with other 80–85 kW Diesel generators →

Service parts for the T70C

Grouped by system, with how many of each the parts manual calls for.

Air intake

1 required

Fuel system

1 required

Oil system

1 required

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

Fueldiesel
Frequency60.0 Hz
Standby power80 kW
Standby kVA100
Prime power55 kW
ControllerMurphy Cascade
Oil capacity9.0 L
AlternatorStamford/AvK UCI224FIL73D
Voltage options208 V, 220 V, 240 V, 440 V, 480 V
Phase3 phase,1 phase
Rated current225 A
Circuit breaker225 A
Coolant capacity9.0 L
Max ambient41 °C
Dimensions (L×W×H)2790×1190×1620 mm
Dry weight2445 kg
Fuel tank606.0 L
Tank runtime28 hr

Engine

Cummins/Onan QSB5-G1 NR3
Coolant capacity9.0 L
Displacement4.5 L
Aspirationturbocharged and charge air cooled
Rated speed1800 rpm

Maintenance & consumables

for the Cummins/Onan QSB5-G1 NR3
ItemSpecCapacityPart #Interval
Air filterAir Filter - Primary125561 Amazon eBay
Fuel filterFuel Filter125551 Amazon eBay
Oil filterOil Filter125550 Amazon eBay

Common questions

What size generator is the Terex T70C?

The Terex T70C is rated 80 kW standby (100.0 kVA).

What engine is in the Terex T70C?

The Terex T70C is powered by the Cummins/Onan QSB5-G1 NR3 engine.

What fuel does the Terex T70C use?

The Terex T70C runs on diesel.

What alternator does the Terex T70C use?

The Terex T70C uses a Stamford/AvK UCI224FIL73D alternator.

What oil filter does the Terex T70C use?

The Terex T70C uses oil filter part number 125550.

What fuel filter fits the Terex T70C?

The Terex T70C uses fuel filter part number 125551.

What air filter fits the Terex T70C?

The Terex T70C uses air filter part number 125561.

Troubleshooting

6

Symptoms & remedies

SymptomCauseRemedy
No generator output voltageCircuit breaker trippedReset circuit breaker
Low generator output voltageVoltage adjustment set too lowAdjust voltage potentiometer
Low engine speedCall TEREX Service
Fluctuating or surging generator output voltageCheck engine fuel, oil, and air filters
High generator output voltageVoltage adjustment potentiometer set too highAdjust potentiometer
High engine speedCall 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 T70C troubleshooting guide (14 entries) →

Parts

6
Part #DescriptionQtySystem
125550Oil FilterOil filter Amazon eBay
125551Fuel FilterFuel filter Amazon eBay
125552BeltBelt Amazon eBay FridayParts $77.87
125561Air Filter - PrimaryAir filter Amazon eBay
125562Air Filter - SecondaryAir filter Amazon eBay
134277T70, T90 & T120 Super Quiet Generator Maintenance ScheduleService part / kit Amazon eBay $34.00

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

RatingLoadL/hgal/h
Prime4.416.6
Prime50%3.413.0
Prime75%5.019.0
Standby5.621.0
Standby100%6.023.0

Available documents

Service manual — 134277 (Terex)