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