The GXM550 takes a stump out below grade and leaves it on site as chip, so a crew can regrade or pave the spot the same day instead of digging a root ball out and hauling it away. It bolts to the excavator arm rather than hanging on pins, so the head goes wherever the boom goes, over a bank, across a ditch, or into a gap too tight to stand a walk-behind machine in front of. It is built for arborists, site clearance crews and utility contractors running a 3.5 to 8 ton carrier, and it reaches half again as deep below grade as the smaller GXM350 does.

The rotor is 24 in across and anchors 12 round carbide teeth packed in groups of three, and the tooth design is where the running cost sits: each tooth loosens and turns to a fresh edge three times before it is spent, and because the work is shared they are replaced two or three at a time rather than as a set. An extra-large blast shield with a dual row of safety chain curtains keeps the chip on the ground, and the same shield doubles as a blade for pushing the pile back into the hole without the operator leaving the cab. The motor choice is where this frame is configured, and it is not a bigger-is-better ladder: at the flows two options share, the larger one is never the quicker, so what it buys is the top of the flow band rather than time. Rated pressure moves the clock as hard as the motor does, every option grinding at least as fast on the higher of its two rated pressures, so match the option to what the carrier actually delivers on both counts, confirm that carrier has a case drain, and read the times each option makes on a 24 in stump in Technical Details.

Common Applications

• Removing stumps on site clearance and landscape work
• Grinding stumps below grade before regrading or paving
• Clearing stumps in tight and awkward ground an excavator can reach
• Utility and right-of-way stump removal

Selection Notes

• Match the motor option to the carrier flow. Each option has its own usable band, and they are in Technical Details.
• The larger motor is not the faster motor. X510, X530, X540 and X550 all grind a 24 in stump in 7 min at 25 GPM and 3,000 PSI, where their flow bands overlap, and X550 reaches 4 min only by running at 40 GPM, which the smaller motors do not reach. A bigger motor buys the top of the flow band, not a shorter grind at the same flow.
• Rated pressure is the second half of the choice. Every option on this frame grinds at least as fast at 4,000 PSI as at 3,000 PSI, by 1 to 5 min depending on the flow, and no option is slower.
• A case drain is critical on every motor option. Confirm the carrier has one before ordering.
• Carrier sizing is a recommendation in tons and is not a lift capacity.
• Mount Option changes what arrives, and with Excavator Weight Class it is the second real decision to make. Blank Weld-On Plate Only ships the supplier's own blank plate, D001161, which the supplier rates for a 1.5 to 10 ton excavator and which the buyer welds on. The three coupler options arrive fitted to the carrier instead.
• Excavator Weight Class is not a duplicate of the motor choice. It sizes the mount to the carrier, and couplers are priced and weighed by ton class, so a 3.5 to 6 ton coupler runs about 100 lb where a 7 to 8 ton coupler runs about 200 lb.
• A coupler is fitted to your specific machine, not to this model. Give the excavator brand and model when ordering.
• The plate's mounting bolt set, D004951, is a separate supplier part number. The supplier lists it as free when the mount is ordered with the whole good. Confirm at time of order.