Short answer
The real risk with a used attachment is not wear but not knowing the wear. An attachment that has worked steadily and been recorded is markedly safer than one with unknown history, and usually worth the difference in price. What you are looking for is not "like new"; what you are looking for is wear that is EVEN. A tool and bushing worn symmetrically describe an attachment used correctly; one-sided wear, cracks and weld repairs may mean walking away whatever the price.
Paper first, metal second
- Is there a service record? Are dates, running hours and replaced parts written down? This is exactly where the value of keeping records shows.
- How many hours has it worked, and where was that counted? A figure taken from the carrier’s hour meter does not show the attachment’s real working time.
- Are the operating manual and parts catalogue present? Without them, where will you get service intervals and torque values?
- Which parts were last replaced, and why? "It had a full service last month" only means something with the invoice beside it.
- What work has it done? Three years in concrete demolition and three years in abrasive rock do not produce the same wear.
What to look at in the metal
- 1
Look at the tool shank
Is there a one-sided polished mark? That says it worked under lateral load and the bushing has not worn evenly. Symmetrical wear is normal; a one-sided mark needs questioning.
- 2
Have the bushing clearance measured
Measured, not judged by rocking the tool. The manual gives the limit. If clearance is at the limit, add the cost of a maintenance kit to the price; well past it, the shank and piston surface need looking at too.
- 3
Inspect around the tie rods
Is there cracked paint around the nuts, fretting dust, or an area that has been repainted? Fresh paint is often applied to cover something.
- 4
Search the body and the bracket joint
Look for weld marks and cracks, particularly where the bracket joins the body. A repair weld is not disqualifying on its own, but why it was done has to be asked.
- 5
Check hose couplings and grease points
Is a coupling mouth crushed, is a grease point blocked or broken? Small items, but they show how seriously maintenance was taken.
- 6
Run it and listen if you can
Run it briefly off load and judge the rhythm and the sound. If the seller will not let you run it, ask why.
Which findings mean walking away?
Some findings are grounds for negotiation; others are not. The distinction comes less from whether the damage is repairable than from whether its cause is known.
- A crack in the body, particularly at the bracket joint: it is structural and its repair is uncertain.
- Deep scoring or corrosion on the piston surface: outside the maintenance kit’s scope, and a separate, expensive item.
- A tool shank that is visibly bent: it shows long work under lateral load, and the bushings are finished too.
- A serial number that is unreadable or removed: it destroys traceability for parts and warranty.
- A seller who will not let you run it: not a finding on its own, but it weighs heavily combined with the others.
Put the maintenance kit into the price from the start
On an attachment with unknown history, the soundest approach is to plan a maintenance kit before commissioning. Treat that not as a surprise expense but as part of the purchase price. If the kit turns out not to be needed you are ahead; if it is, you have already budgeted for it.
When is new the right call?
New wins clearly in three situations. The first is when the attachment is on the critical path: if the whole site stops when it stops, taking on an unknown history costs too much.
The second is buying several of the same attachment. Standardising a fleet brings parts stock and operator habit to one point, and that standardisation is hard to achieve in the used market.
The third is heavy use. For an attachment that will be used rarely, used makes sense; for one working eight hours a day the price difference dissolves quickly inside cost per hour.
Do and don’t
Do
- Look at the paperwork first: service record, manual, parts invoices.
- Have the bushing clearance measured rather than judged by hand.
- Add the cost of a maintenance kit to the purchase budget from the start.
- Look at whether the wear is symmetrical; the shape says more than the amount.
- Confirm the bracket suits your machine before buying.
Don't
- Do not decide on paint and cleanliness; fresh paint hides findings.
- Do not buy an attachment with a cracked body because the price is low.
- Do not accept "lightly used" without a record.
- Do not skip the bracket dimensions on the basis of sorting it later.
- Do not buy an attachment you were not allowed to run without asking why.