What makes the T4D series different from the SPVD and SPD diesel series?

The T4D series uses Volvo Penta's Tier 4 Final / EU Stage V certified engines with SCR (Selective Catalytic Reduction) aftertreatment requiring diesel exhaust fluid (DEF). The SPVD and SPD series use Tier II/III engines without aftertreatment. T4D units are required for non-emergency applications where EPA mandates Tier 4 Final emissions compliance.

What is the DEF consumption?

DEF consumption is approximately 5-9% of fuel consumption. At 8.1 gal/hr diesel at full load, expect 0.4-0.7 gal/hr DEF. The DEF tank requires periodic refilling and DEF quality monitoring — contaminated or expired DEF will trigger derate conditions.

Are the standby and prime ratings the same?

Yes — the T4D-1000 is rated at 100 kW for both standby and prime duty. This dual rating makes it suitable for both emergency backup and continuous prime power applications.

Why is the T4D-1000 physically longer than the Tier III SPD-1000?

The T4D-1000 is 172 inches long vs. 98 inches for the SPD-1000 at the same kW rating. The additional length accommodates the SCR catalyst, DEF injection system, and aftertreatment housing. Tier 4 Final compliance adds significant physical footprint.

What makes the T4D series different from the SPVD and SPD diesel series?

The T4D series uses Volvo Penta's Tier 4 Final / EU Stage V certified engines with SCR (Selective Catalytic Reduction) aftertreatment requiring diesel exhaust fluid (DEF). The SPVD and SPD series use Tier II/III engines without aftertreatment. T4D units are required for non-emergency applications where EPA mandates Tier 4 Final emissions compliance.

What is the DEF consumption?

DEF consumption is approximately 5-9% of fuel consumption. At 8.1 gal/hr diesel at full load, expect 0.4-0.7 gal/hr DEF. The DEF tank requires periodic refilling and DEF quality monitoring — contaminated or expired DEF will trigger derate conditions.

Are the standby and prime ratings the same?

Yes — the T4D-1000 is rated at 100 kW for both standby and prime duty. This dual rating makes it suitable for both emergency backup and continuous prime power applications.

Why is the T4D-1000 physically longer than the Tier III SPD-1000?

The T4D-1000 is 172 inches long vs. 98 inches for the SPD-1000 at the same kW rating. The additional length accommodates the SCR catalyst, DEF injection system, and aftertreatment housing. Tier 4 Final compliance adds significant physical footprint.

Gillette · T4D Series (Tier 4 Final Prime Diesel)

New

Gillette T4D-1000

Name: Gillette T4D-1000
Brand: Gillette
Availability: PreOrder

100 kW standby · Diesel · Liquid-cooled

100 kW Tier 4 Final / Stage 5 diesel generator with Volvo Penta TAD581VE 5.13L engine. SCR aftertreatment, DEF system, Basler DGC-2020 controller. Made in USA.

Gillette T4D-1000

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Standby power: 100 kW / 100 kW prime
Voltage options: 120/240V, 120/208V, 277/480V, 346/600V
Frequency / Phase: 60 Hz · 1/3-phase
Engine: Volvo Penta TAD581VE · 5.13L
EPA / Emissions: Tier 4 Final
Alternator: Stamford UCI274E-311

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Overview#

The Gillette T4D-1000 is a 100-kilowatt Tier 4 Final / EU Stage V dual-certified diesel generator on Volvo Penta's TAD581VE — a 5.13L turbocharged inline-4 with SCR aftertreatment and DEF injection. Rated at 100 kW for both standby and prime duty. Stamford UCI274E alternator, Basler DGC-2020 controller.

The T4D series is Gillette's emissions-compliant diesel lineup for non-emergency applications where EPA mandates Tier 4 Final compliance. Unlike the Tier II/III models (SPVD, SPD, SPJD), the T4D units include SCR catalyst systems requiring diesel exhaust fluid.

Tier 4 Final — what's different from Tier III#

The T4D-1000 adds several systems not present on Tier III diesel generators:

SCR (Selective Catalytic Reduction) — reduces NOx emissions using DEF injection into the exhaust stream
DEF tank and injection system — requires regular DEF refilling (5-9% of diesel consumption)
Aftertreatment housing — adds 74 inches to the unit length vs. comparable Tier III models
Onboard diagnostics — the engine management monitors SCR performance and can derate if DEF quality degrades

Our service experience#

The T4D Tier 4 Final Volvo engines are the same platform used in newer Kohler and Blue Star generators meeting current emissions requirements. The DEF system adds a maintenance item not present on Tier III units — DEF quality and level monitoring become part of each service visit. We recommend DEF inventory management (shelf life ~2 years) and temperature-controlled storage for DEF in warm climates.

Engineering specifications

Physical

Length: 172 in
Width: 52 in
Height: 65 in
Wet weight: 3,977 lb

Acoustic

Sound @ 7m, full load: 78 dBA
Enclosure: Sound-attenuated

Fuel system & runtime

Fuel use @ full load: 8.1 GPH

Documents & downloads

Spec sheets & manuals

Spec sheet (datasheet)

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Tell us about the application — kW, voltage, application, install timeline — and we'll respond within one business day with budgetary pricing, lead time, and any sizing notes.

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Estimate runtime for the Gillette T4D-1000

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

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Generator size

Fuel

Fuel tank capacity

gal

Load

Override full-load GPH (optional)

GPH

Estimated runtime

32.0 hours(1.3 days)

Fuel consumption ≈ 6.25 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the Gillette T4D-1000 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter: Every 500 hours or 12 months
Coolant change: Every 6000 hours
Air filter: Every 1000 hours
Fuel filter: Every 500 hours
Major overhaul: ≈ 20,000 hours
Load bank test: Every 12 months

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

Component	Symptom	Typical hours	Severity
DEF system (SCR catalyst)	Derate warning, NOx fault, DEF quality alert	4,380+	moderate
DPF / aftertreatment	Regen required, backpressure fault	2,000+	moderate
Fuel quality	Injector fouling, hard starting	4,380+	moderate

Frequently Asked Questions

What makes the T4D series different from the SPVD and SPD diesel series?: The T4D series uses Volvo Penta's Tier 4 Final / EU Stage V certified engines with SCR (Selective Catalytic Reduction) aftertreatment requiring diesel exhaust fluid (DEF). The SPVD and SPD series use Tier II/III engines without aftertreatment. T4D units are required for non-emergency applications where EPA mandates Tier 4 Final emissions compliance.
What is the DEF consumption?: DEF consumption is approximately 5-9% of fuel consumption. At 8.1 gal/hr diesel at full load, expect 0.4-0.7 gal/hr DEF. The DEF tank requires periodic refilling and DEF quality monitoring — contaminated or expired DEF will trigger derate conditions.
Are the standby and prime ratings the same?: Yes — the T4D-1000 is rated at 100 kW for both standby and prime duty. This dual rating makes it suitable for both emergency backup and continuous prime power applications.
Why is the T4D-1000 physically longer than the Tier III SPD-1000?: The T4D-1000 is 172 inches long vs. 98 inches for the SPD-1000 at the same kW rating. The additional length accommodates the SCR catalyst, DEF injection system, and aftertreatment housing. Tier 4 Final compliance adds significant physical footprint.

Compatible equipment

Transfer switches

ASCO 300 Series ATSAutomatic Transfer Switches

Tier 33-phasecommercialhospital

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