CAT's 573D Wheel Feller Buncher: What the D-Series Upgrade Actually Changed From the 573C

A wheel feller buncher earns its keep on flat-to-rolling ground where cut-and-carry speed matters more than steep-slope stability, and CAT has quietly moved its larger wheel feller bunchers from the C Series to a new D Series without changing the one number loggers care about most: horsepower. The 573D replaces the 573C at the top of CAT's wheel feller buncher lineup, and both run the exact same 241-hp C7.1 ACERT engine. That is worth saying plainly up front, because a model-letter change usually gets read as a bigger deal than this one actually is.

So what did CAT actually spend its engineering budget on between the 573C and the 573D? Mostly weight and attachment integration, not raw power. The 573D's published operating weight without attachment comes in at 33,123 lbs, meaningfully heavier than the 573C's 31,840 lbs on the same 28L-26 tires, roughly 1,280 lbs of added structure. CAT's own D Series documentation points to a reworked two-speed gearbox with improved sealing, larger bearings, and stronger gears, an upgraded electrical system built on field-proven CAT controls, and a Power Direct Plus hydraulic system enhancement aimed at improving both travel power and saw recovery speed, the time it takes the saw head to reset after a cut. For a contractor running production thinning or final-harvest cutting, saw recovery speed is a direct cycle-time number, not a marketing phrase, since every second the head spends resetting is a second it isn't cutting the next stem.

The 573D by the Numbers

The C7.1 ACERT engine makes 241 hp at 1,880 rpm. Wheelbase is 115 inches. Operating weight without attachment is 33,123 lbs on 28L-26 tires, with CAT publishing weight adjustments for every tire option up through 67x34 flotation tires. The hydrostatic pump moves 64 gpm at 5,420 psi, and the primary and attachment pumps each move 41 gpm at 4,000 psi. Fuel capacity is 81 gallons.

The saw head you pick changes the machine's real-world capability more than anything in the base carrier spec. CAT offers three for the 573D: the HFW221 felling saw (22.7-inch maximum single cut, 5.1 sq ft accumulation area, 7,100 lbs), the HFW222 SC side-cut saw (22-inch max cut but with a genuinely useful 30-inch directional felling capacity thanks to its side-cut door, 6,554 lbs), and the HFW232 high-capacity saw (22.6-inch max cut with the largest accumulation area at 8.6 sq ft, 6,277 lbs). A contractor cutting mixed-diameter stands where directional control matters, keeping felled trees out of a road ditch or a property line, should be looking hard at the HFW222 SC rather than defaulting to whichever saw the dealer has on the lot.

The 553C: Still Waiting on Its D-Series Turn

Here's the detail that an honest spec comparison has to include: CAT's smallest wheel feller buncher, the 553C, has not received a D-Series update. It's still selling as a C Series machine today, built around a 174-hp C6.6 ACERT engine on a 110-inch wheelbase, with an operating weight of 30,560 lbs. CAT's own dealer literature describes it plainly as sharing the 563C and 573C's performance, reliability, and serviceability advances but running a different, smaller engine, and built specifically for thinning-to-final-harvest work on primarily flat terrain. If you're sizing a wheel feller buncher purchase against the 553C, you're comparing it to the 563C/573C generation, not the 573D, because that's genuinely the current state of CAT's own lineup.

That gap matters less than it might sound. A contractor buying at the 553C's size class is almost always running smaller-diameter thinning work on flatter ground where the D-Series gearbox and electrical upgrades matter less than they do on a 573-class machine doing heavier final-harvest cut-and-carry work all day. The 553C's job is still getting done; it just isn't the newest iron on the lot.

• 573D: 241-hp C7.1 ACERT, 33,123 lbs operating weight, reworked gearbox and electrical system, improved Power Direct Plus saw recovery

• 573C (predecessor): same 241-hp C7.1 ACERT, 31,840 lbs operating weight, earlier-generation gearbox and controls

• 553C: still current C Series, 174-hp C6.6 ACERT, 30,560 lbs, built for thinning on flat terrain

• Three saw head options for the 573D/563D: HFW221, HFW222 SC (30-inch directional felling), and HFW232 (largest accumulation area)

Who Actually Buys a Wheel Feller Buncher

This is professional logging and timber-harvest equipment, not land-clearing attachment territory. Pulpwood and sawtimber harvesting crews, logging contractors cutting under contract for mills or landowners, and right-of-way clearing contractors working large flat-ground corridors are the realistic buyers here. If your business is clearing brush and small-diameter overgrowth on individual lots rather than harvesting merchantable timber by the acre, a mulching attachment on a skid steer or excavator is almost always the better-fitted and far less expensive tool; a dedicated wheel feller buncher is overkill for that work and underkill for nothing it's actually built to do.

Why Owning Beats Renting on Production Logging Work

A wheel feller buncher that sits idle doesn't cut wood, and wood that isn't cut doesn't get paid for, which is the simplest version of the rent-vs-own case in logging. Dedicated forestry equipment like the 573D is a scarce rental item in most regions, meaning a rented machine often means waiting, and waiting on a mill contract or a landowner harvest window costs real money that a financed, owned machine doesn't. Owning also means the saw head configuration stays matched to your typical stand, instead of taking whatever attachment the rental yard happens to have on hand that week.

The honest counterpoint: this is expensive, specialized equipment, and a logging operation with genuinely seasonal or contract-dependent volume should run its own utilization numbers before committing to ownership over a rental or subcontracted cutting arrangement.

Financing a Wheel Feller Buncher

Logging and forestry equipment financing through BFC is built around how logging contracts actually pay, not a one-size payment schedule. We work with logging and land-clearing contractors nationwide, startups and established fleets alike, across credit profiles, on financing or leasing for a 573D, 553C, or any wheel feller buncher you're sizing against your real harvest volume. As always, treat specific payment figures as illustrative only until you apply, and confirm depreciation strategy, including Section 179 and bonus depreciation, with your own tax professional before building it into your bid pricing.

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