Spider Crane Engine Options: Yanmar 3TNV/4TNV vs. Kubota D722 Explained
Every Risenmega spider crane leaves the factory with a dependable, Euro V-compliant diesel engine as standard. But "standard" isn't always the right spec for every job site. A crane working short, light cycles in a warehouse has very different power needs from one swinging a full load at 8.5 meters outreach, all day, on a steel erection site. That's why we let buyers step up to a premium Yanmar TNV-series engine — or switch brands entirely to a Kubota — matched to the exact tonnage and duty cycle of the machine.
This guide walks through every engine option available across Risenmega's spider crane range: the three-cylinder Yanmar engines built for the 3-ton class, the larger four-cylinder units for machines above 5 tons, the Kubota alternative, and the diesel-electric dual power configuration for indoor work.
Key Takeaways
- Every Risenmega spider crane ships with a Euro V / EPA-compliant diesel engine as the standard configuration — no upgrade required to meet current emissions rules.
- For the 3-ton class, buyers can upgrade to Yanmar's 3TNV74, 3TNV80, or 3TNV88 (Euro 5, EPA), each step adding displacement and rated output for heavier duty cycles.
- Once a machine moves past 5 tons, Risenmega switches to the four-cylinder Yanmar 4TNV80 and 4TNV98 for the extra continuous torque a longer boom and heavier load demand.
- Kubota's D722 is available as an alternative engine brand across the same range, for buyers who standardize their fleet on Kubota parts and service.
- Any configuration can also be built as diesel-electric dual power, switching to external AC power for silent, zero-exhaust indoor lifting.
Why Engine Choice Matters on a Spider Crane
A spider crane's diesel engine doesn't just move the machine — it drives the hydraulic pump that powers the boom, the winch, the slew, and the outriggers, often all at once during a lift. Undersize the engine and the crane feels sluggish under load or struggles to sustain full hydraulic pressure on long cycles; oversize it and you're carrying extra weight and fuel consumption you don't need on a compact chassis built to fit through a standard doorway. Getting the match right is also why Risenmega offers a genuine choice of engine brand: Yanmar and Kubota are both long-established Japanese diesel manufacturers with global parts and service networks, so the right call often comes down to which brand your crew already maintains.
The Power Ladder: From 3-Ton to 5-Ton+
The chart below shows how displacement steps up across the lineup as tonnage class and duty cycle increase — from the compact 3TNV74 through to the four-cylinder 4TNV98.
Displacement by engine, 3TNV74 through 4TNV98 — orange marks the 3-ton class, blue marks 5-ton-and-up.
Yanmar 3TNV Series — Built for the 3-Ton Class
Risenmega's 3-ton spider cranes (up to 1.5 m radius and roughly 8.5 m maximum outreach) pair naturally with Yanmar's three-cylinder TNV series. All three engines share the same compact, vertical, water-cooled architecture — light enough to keep the crane's chassis narrow and its folded footprint under 800 mm, so it still rolls through a standard doorway — but each step up in bore size adds meaningful displacement and output for a heavier duty cycle.
Yanmar 3TNV74
3-cylinder, 0.99 L, roughly 19 hp (14.2 kW) at 3,000 rpm. The lightest option in the range — a good fit for lighter, intermittent lifting cycles.
Yanmar 3TNV80
3-cylinder, 1.27 L, roughly 24 hp (17.8 kW) at 3,000 rpm. A step up in both displacement and torque for more sustained hydraulic demand.
Yanmar 3TNV88
3-cylinder, 1.64 L, direct injection, up to roughly 37 hp gross (28 kW) at 3,000 rpm. The strongest 3-cylinder option, for the heaviest duty cycles within the 3-ton class.
| Engine | Cylinders | Displacement | Rated Output | Emissions |
|---|---|---|---|---|
| 3TNV74 | 3 | 0.99 L | ~19 hp @ 3,000 rpm | Euro 5 / EPA compliant |
| 3TNV80 | 3 | 1.27 L | ~24 hp @ 3,000 rpm | Euro 5 / EPA compliant |
| 3TNV88 | 3 | 1.64 L | ~37 hp (gross) @ 3,000 rpm | Euro 5 / EPA compliant |
Figures reflect Yanmar's published industrial engine data and are configurable to project requirements. Confirm the exact rated output for your machine and destination market with our sales team before ordering.
Moving Past 5 Tons: Yanmar 4TNV80 & 4TNV98
Once a spider crane's rated load climbs past 5 tons, the hydraulic system is doing noticeably more work — longer booms, larger outriggers, and heavier sustained loads all pull more continuously from the pump. That's the point where Risenmega moves from the three-cylinder TNV engines to the four-cylinder line: the 4TNV80 and the larger 4TNV98.
The four-cylinder architecture runs smoother under continuous load than a three-cylinder engine of similar class, which matters when the pump is under near-constant demand through a full shift. The 4TNV80 is the entry point into this class — a four-cylinder engine on the same compact 80 mm-bore platform as the 3TNV80, giving more continuous torque than the three-cylinder line without jumping all the way up in displacement. The 4TNV98 sits above it: a 3.32-liter, four-cylinder unit rated up to roughly 68 hp (52 kW) at 2,500 rpm in its naturally aspirated industrial configuration, with turbocharged variants available where even more continuous power is required.
If your project calls for a Kubota-powered machine above 5 tons, the same logic applies on that side of the range: we step up from the D722 to a larger-displacement Kubota industrial diesel matched to the same power class as the 4TNV98. Tell our team your target tonnage and boom length and we'll confirm the exact model.
Alternative Brand: Kubota D722
Not every buyer wants to standardize on Yanmar — fleets that already run Kubota-powered equipment often prefer to keep parts, filters, and service intervals consistent across every machine on site. For that reason, the Kubota D722 is available as a direct alternative in the 3-ton class.
The D722 is a compact three-cylinder, water-cooled diesel — 0.72 L displacement, rated at roughly 20 hp (14.9 kW) gross output, built on Kubota's E-TVCS combustion design and available in a Stage V-ready configuration. It's a well-proven engine across mini excavators, compact loaders, and generators worldwide, which means parts and qualified technicians are easy to find almost anywhere your crane travels.
Yanmar or Kubota — How to Decide
Both brands meet the same emissions standards and deliver the reliability this class of equipment is known for; there isn't a wrong choice between them. In practice, the decision usually comes down to two things: which brand your maintenance crew already knows, and which dealer network is closer to your job sites. If you're not standardized on either yet, tell us your primary operating region and we can point you to whichever has stronger local parts support.
Diesel or Electric? The Indoor Power Option
Engine selection covers outdoor range and duty cycle — but plenty of Risenmega spider cranes also work indoors, where a running diesel engine isn't always welcome. For those jobs, the crane can be configured for dual fuel-electric power: it starts and runs on diesel as standard, then switches to an external AC power supply — building mains, a generator, or shore power — through a control cabinet on the chassis.
Once plugged in, the diesel engine can shut off completely while the hydraulics keep running at the same rated performance — ideal for hospitals, malls, occupied offices, or any site with noise and exhaust restrictions. We cover exactly how the switch works, step by step, in our dedicated guide: Spider Crane Dual Fuel-Electric Power Explained.
Frequently Asked Questions
Do I have to upgrade past the standard engine?
No. Every Risenmega spider crane ships with a Euro V / EPA-compliant diesel engine as standard, which meets current emissions requirements on its own. The Yanmar and Kubota upgrades exist for buyers who want more output for a heavier duty cycle, a specific brand for fleet consistency, or both.
How do I know which Yanmar 3TNV engine my 3-ton crane needs?
It comes down to duty cycle. Lighter, intermittent lifting suits the 3TNV74; frequent full-outreach lifts or longer daily runtime point toward the 3TNV80 or 3TNV88. Tell us how the crane will be used and we'll recommend the right step.
At what tonnage do I need the 4TNV80 or 4TNV98 instead of a 3TNV engine?
Once a machine's rated capacity moves past 5 tons, the hydraulic system needs the extra continuous torque a four-cylinder engine provides, so we move to the 4TNV80 or 4TNV98 depending on the exact tonnage and boom configuration.
Are these engines compliant with Euro 5 and EPA regulations?
Yes. The 3TNV74, 3TNV80, 3TNV88, and Kubota D722 are all available in Euro 5 / EPA-compliant configurations, so the machine can be shipped compliant for either market.
Can I switch a diesel-engine crane to electric power later, or does it need to be built in from the start?
Dual fuel-electric power is a factory configuration — the control cabinet, power switch, and motor socket are engineered into the chassis. Let us know at the time of order if you want this option so it's built in from the start.
Is the Kubota D722 available on every spider crane model?
The D722 is available across Risenmega's 3-ton class spider cranes. For machines above 5 tons, we pair Kubota buyers with a larger-displacement engine in the same power class as the 4TNV98 — confirm the exact model with our sales team for your tonnage.
Not Sure Which Engine Fits Your Project?
Tell us your target tonnage, boom length, and duty cycle — we'll match you to the right Yanmar or Kubota configuration, diesel or dual power.
Get a Free Quote →Explore the full Spider Crane collection from 1 to 12 tons, compare boom heights and tonnage in our 2-ton vs. 3-ton spider crane guide, or read more on diesel-to-electric dual power for indoor jobs.
Further reading on engine specifications: Yanmar 3TNV88 official spec sheet, Yanmar 4TNV98 official spec sheet, and Kubota D722 product page. Specifications reflect published manufacturer data and are configurable to project requirements — confirm exact power options with our sales team before ordering.
