How can I tell how many hours a used breaker has worked?

Most breakers have no hour meter of their own; the hours a seller quotes usually come from the machine’s meter or from an estimate. Service invoices and reports are more reliable. Without records, look at the wear itself: bushing clearance, the marks on the tool shank and the condition of the pin slots.

Should I buy a used breaker without testing it?

It is not recommended. If a test is not possible, make it a condition that the breaker is opened so the piston, cylinder and bushings can be inspected, or buy at a price that allows for a seal kit and service kit.

Does the seal kit need changing straight after purchase?

Not necessarily, if the breaker has good records and tested well. If its history is unknown, starting with a service kit before putting it to work (renewing the bushings and wear parts along with the seals) and checking the nitrogen takes the guesswork out of the months that follow.

What else should I check on a used silenced breaker?

The wear plates and damping blocks inside the outer housing. When they wear, the body moves inside the housing, noise and vibration increase and the housing can crack. The body’s condition cannot be fully judged without seeing inside the housing.

Can I get parts for a used breaker of another brand?

For most common brands, yes. HKM makes spare parts and tools to fit more than 130 breaker brands. Asking about parts availability with the model and serial number before buying avoids surprises later.

Used Hydraulic Breaker: Inspection Checklist Before Buying

Short answer

Before buying a used hydraulic breaker, check four things: its identity (nameplate, model, serial number and parts availability), the wear visible with the breaker cold (bushing clearance, marks on the tool shank, the front head and pin bores, the tie rods, leak marks), whether it holds pressure (a nitrogen measurement), and how it behaves running on a suitable machine (rhythm, sound, heat, leaks). A cracked body or an undocumented crack repair and an unreadable serial number call for walking away whatever the price; a breaker that does not hold nitrogen, or oil coming out of the charging valve, means it should not be bought without being opened first. Other defects are a matter for negotiation; the cost of a seal kit or service kit is added to the purchase price from the start.

Editor: Ahmet AkkayaPublished: 27 October 2026

Why a separate checklist?

We covered how to look at paperwork, records and general wear when buying any used attachment in the new or used guide. A breaker is different: it contains pressurised gas, a piston running at high speed and a tool area that wears constantly. Its inspection needs a list of its own, and this guide gives it.

Identity first: what breaker is it, and can you get parts?

Nameplate: can the brand, model and serial number be read? If there is no plate, does the sales paperwork give the model? On a breaker whose serial number has been removed or ground off, neither parts nor history can be traced.
Version: the same model name can come in silenced (boxed) and open-body versions or in different generations, and the parts differ accordingly.
Parts availability: before buying, ask with the model and serial number whether a seal kit, bushings and tools are available. We covered what that needs in the guide to ordering spare parts.
Machine match: do the breaker’s weight class and flow range suit your machine, and does its bracket fit? You can check the match with the breaker selector.

Questions for the seller

What work did it do? A year in a quarry and hard rock leaves different wear from a year in concrete demolition.
What machine was it on? A breaker run on a machine larger than its class sees more side load; one run outside its flow and pressure range wears its seals and internal parts early.
When were the seal kit, bushings and tool last changed, and is there an invoice or service report?
When was the nitrogen last measured or charged? A breaker that needs frequent charging is losing gas.
Has the body ever been opened, and if so by whom? After an unrecorded strip-down, torque and nitrogen values can be uncertain.
Why is it being sold?

Before running it: the cold inspection

We gave the inspection order for the tool shank, bushing clearance, tie rods, body cracks, couplings and grease points in the new or used guide; those steps apply to a breaker unchanged. Two reminders: bushing clearance is judged by measuring, not by feel (bushings guide), and the meaning of the marks on the tool shank is in the guide to the marks on a tool shank. The following three checks are specific to breakers.

1
Read where the leak marks are
Oil from the tool area usually means the bushing and seal chain; oil from a body joint points to a loose tie rod; oil at the base of a coupling points to a hose or O-ring. On a freshly washed breaker these marks are gone, so see the breaker unwashed if you can.
2
On a silenced type, look inside the housing
Check the wear plates inside the outer housing, the damping blocks and the housing’s mounting to the body. When they wear, the body moves inside the housing; noise and vibration increase and the housing can crack.
3
Have the nitrogen measured cold
Ask the seller to measure the nitrogen pressure in front of you, with the breaker’s charging kit and the breaker cold, and compare it with the manual. If the pressure is very low, or drops again within a few days, gas is leaking. We covered how the measurement is done in the nitrogen pressure guide.

The test on a machine

Seeing the breaker work is the most informative step before buying. The test should be done on a machine that suits the breaker’s class and has a correctly set hammer line; a test on the wrong machine can make a sound breaker look weak, or a weak one look like the machine’s fault.

Wait for the oil to warm up, then run the breaker with the tool pressed on the material. Running it with the tool in the air tells you nothing and harms the breaker.
Listen to the rhythm: a steady, solid rhythm is expected. Slow, feeble blows suggest a nitrogen or flow problem; an irregular rhythm suggests internal leakage or a valve problem. We covered how to read the sound in the breaker sound guide.
After a few minutes, look again at the body joints, the tool area and the couplings.
Check the body temperature; a breaker that overheats in a short test may have a flow, nitrogen or internal leakage problem.
Watch the hoses; heavy vibration can point to an accumulator or line problem. We collected the causes symptom by symptom in the troubleshooting guide.

Which findings mean walking away?

Two findings stop the purchase until the breaker has been opened and looked at. The first is a breaker that does not hold nitrogen, or oil coming out of the charging valve: oil is passing to the gas side; the cause may be a seal or the diaphragm and can be repaired, but the internal condition cannot be known without opening it. The second is deep scoring on the piston or cylinder surface once the breaker is opened; that is a job not for a seal kit but for a far more expensive repair. We explained why the two are assessed together in the piston and cylinder guide.

A crack in the front head, the tool area or the pin bores, or a crack repair whose cause and repairer are not documented.
A serial number that is unreadable, removed or does not match the paperwork.
A breaker that does not strike, or strikes very weakly, even when tested on a suitable machine.

What is negotiable

A worn tool, a bushing at its limit, a leaking seal, a dented coupling or a broken grease nipple do not stop the purchase on their own; their cost comes off the price. Decide which kit is needed using the service kit and seal kit guide; we covered how the seals are changed in the seal kit change guide.

Working out the real cost

The price of a used breaker is judged together with the cost of getting it working: a service kit or seal kit if needed, a new tool and bushings, a bracket for your machine, a hose set and any adjustment to the hammer line. Once these are added up, the difference may be smaller than expected; we showed how to turn it into an hourly cost in the real cost of a cheap attachment guide.

Once you have the model and serial number, you can ask us about parts availability and what the kit you will need contains. HKM makes spare parts and tools to fit more than 130 breaker brands; send your request to sales@hkm.com.tr.

Used hydraulic breaker: what to check before you buy