Gillette · T4D Series (Tier 4 Final Prime Diesel)

Gillette T4D-3500

350 kW standby · Diesel · Liquid-cooled

350 kW Tier 4 Final / Stage 5 diesel generator with Volvo Penta TAD1385VE 12.8L engine. Water-to-air aftercooled, SCR+DEF, Basler DGC-2020. Made in USA.

Gillette Gillette T4D-3500 generator — specifications and details
Standby power
350 kW / 350 kW prime
Voltage options
120/208V, 120/240V, 277/480V, 346/600V
Frequency / Phase
60 Hz · 3-phase
Engine
Volvo Penta TAD1385VE · 12.8L
EPA / Emissions
Tier 4 Final
Alternator
Stamford S4L1D-F311
CommercialHealthcareprime-powerGovernmentData CentersManufacturing
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Overview#

The Gillette T4D-3500 is a 350-kilowatt Tier 4 Final / Stage V diesel generator — the output ceiling of the 12.8L Volvo Tier 4 Final platform. TAD1385VE with water-to-air aftercooling and SCR. Rated at 350 kW for both standby and prime. Stamford S4L1DF alternator, Basler DGC-2020.

12.8L Tier 4 Final at maximum output#

At 551 bhp from 12.8L with SCR aftertreatment, the T4D-3500 operates at the highest thermal and mechanical loading in the 12.8L T4D family. Above 350 kW Tier 4 Final, the T4D-6000 jumps to 600 kW on Volvo's 16.1L TWD platform — there is no T4D-4000 or T4D-5000.

Our service experience#

The 12.8L at maximum Tier 4 Final output demands rigorous adherence to service intervals. The water-to-air aftercooler, SCR catalyst, and turbocharger all operate at elevated duty — we inspect all three systems at each service visit.

Engineering specifications

Physical

Length
152 in
Width
72 in
Height
87 in
Wet weight
9,625 lb

Acoustic

Sound @ 7m, full load
83 dBA
Enclosure
Sound-attenuated

Fuel system & runtime

Fuel use @ full load
25.9 GPH

Documents & downloads

Spec sheets & manuals

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Estimate runtime for the Gillette T4D-3500

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

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Estimated runtime

10.0 hours(0.4 days)

Fuel consumption ≈ 19.98 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-3500 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.

ComponentSymptomTypical hoursSeverity
DEF system (SCR catalyst)Derate warning, NOx fault, DEF quality alert4,380+moderate
Fuel qualityInjector fouling, hard starting4,380+moderate
BatteryFailed to start, slow crank8,760+minor

Frequently Asked Questions

Is the T4D-3500 the largest 12.8L Tier 4 Final model?
Yes — the TAD1385VE at 350 kW / 551 bhp is the output ceiling of the 12.8L Tier 4 Final platform, just as the TAD1353GE is the ceiling of the 12.8L Tier III platform (SPVD-4000 at 400 kW). Above 350 kW T4F, the T4D-6000 steps to the 16.1L TWD1683GE.
DEF consumption at 350 kW?
Approximately 6.5% of diesel. At 25.9 gal/hr diesel, expect ~1.7 gal/hr DEF at full load.

Compatible equipment

Transfer switches

More in the T4D Series (Tier 4 Final Prime Diesel)

100–600 kW Tier 4 Final diesel with equal standby and prime ratings — Volvo VE-series with SCR.

View all 7models in this series →

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