Coupler and pins first
Confirm universal quick-attach versus proprietary (Bobcat pre-quicks, Euro/global for tractors). Then measure: pin diameter in millimeters and center-to-center spacing. A 5mm pin error is a non-fit, and sellers list both numbers for exactly this reason.
For buckets and auger bits, also note cutting-edge width and tooth shank series (e.g. J200-style systems) — teeth are not interchangeable across shank families. Photograph the coupler face with a tape measure in frame so spacing is unambiguous.
- Coupler standard identified: universal quick-attach, Bobtach, Euro/global, or pin-on.
- Pin diameter (mm) and center-to-center spacing recorded from a tape-measure photo.
- Tooth shank series confirmed for buckets; drive shaft size/profile confirmed for augers.
Hydraulics: flow, pressure, and case drain
Match the attachment motor to your auxiliary circuit: standard-flow versus high-flow machines, GPM at rated RPM, and relief pressure. Mulchers, cold planers, and large augers starve — then overheat — on insufficient flow.
Check whether the attachment needs a case drain line. Piston motors without one will blow shaft seals on machines plumbed for gear motors. When in doubt, the attachment manual drain requirement wins over the machine plumbing assumption.
- Attachment minimum continuous GPM confirmed against machine auxiliary output.
- Relief pressure compatible; hoses and couplers rated for the circuit.
- Case drain present if the attachment manual requires one.
Tracks, tires, and transport
On tracked machines, confirm track width and lug pattern against the undercarriage before adding ground-engaging implements that raise traction loads. On tired machines, foam-fill or solid options end puncture downtime in demolition and scrap work.
Plan delivery: buckets ship parcel freight, but mowers, auger drives with bits, and blades go LTL. Orders over $300 ship free freight — combine wear parts with the attachment.
- Track width/lug or tire setup confirmed for the added traction load.
- Jobsite access checked for LTL delivery (forks, liftgate, or dock).
- Wear parts (teeth, blades, pins) combined on the same order for free freight.
Greasing, torque, and the 10-hour check
New attachments loosen in the first hours. Grease every pin and bushing at install, torque mounting bolts to the manual spec, and recheck everything at 10 hours — pins seat, bolts stretch, and hoses settle into their routing. A re-torque at 10 hours prevents the wallowed pin bores that condemn an otherwise good attachment.
Hose routing deserves the same attention: secure hoses clear of pinch points at full articulation, confirm couplers latch with an audible click, and cap every open fitting during storage. A $5 dust cap prevents the contaminated-coupler failures that kill hydraulic motors.
- All pins greased at install; bolts torqued to manual spec.
- Re-torque and re-grease at 10 hours; hoses routed clear at full articulation.
- Couplers capped in storage; hydraulic fluid and filter condition checked seasonally.
Used attachments: inspection before money changes hands
Used attachments reward inspection and punish optimism. Check pin bores for wallowing (shine a light through and look for egg-shaping), cutting edges for remaining life, hydraulic cylinders for weeping seals, and hoses for cracked covers at flex points. Cycle hydraulic functions through full range and listen for cavitation that signals a tired motor.
Price the wear parts before negotiating: teeth, blades, hoses, and pins have catalog prices, and a "good deal" needing a full wear refresh is often dearer than a cleaner unit. Confirm the coupler standard matches your machine in person — seller assurances about universal fit are the most expensive words in used equipment.
- Pin bores, edges, seals, and hoses inspected in person through full range.
- Wear-part replacement priced before negotiating the asking price.
- Coupler standard physically confirmed against your machine measurements.
Attachment storage that prevents next-season failures
How an attachment waits out winter decides how it works in spring. Grease every fitting before storage so fresh grease — not moisture — sits in the pins, park implements on timbers rather than bare soil, and cycle cylinders to mid-stroke so rods rest protected rather than fully exposed. Drain water-collecting buckets and mower decks so freeze expansion does not crack welds.
For hydraulics, cap every coupler immediately after disconnecting, store hoses coiled without kinks, and tag any fitting that wept during the season for seal replacement before spring work. A dry concrete pad with a tarp beats a muddy corner: moisture wicks into pins and connectors alike, and the corrosion it leaves bills you in April for what October neglect caused.
- Greased, blocked on timbers, cylinders at mid-stroke, water drained.
- Couplers capped at disconnect; weeping seals tagged for pre-season replacement.
- Dry storage under cover; pins and connectors re-greased before spring work.
Attachment insurance: pins, teeth, and hoses on the shelf
Three cheap spares prevent the most downtime: a set of bucket or mower teeth with retaining hardware, two spare hydraulic hoses with quick couplers matched to your machine, and a pin-and-bushing kit for the highest-wear joint. Each costs a fraction of a lost workday and ships cheaply with the attachment order when freight is already covered.
Track wear items by hour meter rather than memory: teeth when the edge feathers, hoses at the first cover crack, pins when grease stops holding. The contractors with the fewest breakdowns are not lucky — they replace wear parts on condition at the shop instead of on failure at the jobsite.
- Teeth, hose pair, and pin kit stocked with the attachment order.
- Wear tracked by hours and condition; replaced at the shop, not the jobsite.
Hydraulic oil and filtration: the invisible wear part
Attachments die from dirty oil more often than from hard work. A mulcher or auger on contaminated fluid cavitates its motor, scores its seals, and sends debris back into the machine circuit — so confirm hydraulic fluid condition and filter hours before blaming the attachment for slow or jerky operation. Milky fluid means water contamination, dark burnt-smelling fluid means overheating, and either one must be resolved before a new attachment goes on the circuit.
Match fluid spec to both machine and attachment manuals: viscosity grade, anti-wear rating, and cold-weather pour point all matter, and mixed fluids can foam or separate. Change filters on the attachment schedule as well as the machine schedule, and flush quick couplers before connecting — the dirt in an open coupler goes straight into the motor on first engagement.
- Fluid and filters verified before condemning attachment performance.
- Fluid spec matched to both manuals; couplers flushed before connecting.
Pre-order measurement sheet
Fill this in once and keep it in the cab: machine make/model/year, coupler standard, pin diameter and spacing, auxiliary GPM at rated RPM with standard/high-flow noted, case-drain availability, and track/tire size. Every future attachment order draws from the same sheet instead of a fresh round of crawling under the machine.
- Machine make, model, year, and serial recorded.
- Coupler standard + pin measurements + auxiliary GPM and case-drain status.
- Track/tire size and delivery constraints noted for LTL items.