Hydraulic breakers: version-specific flow, pressure and working limits
Hydraulic breakers must match the carrier’s approved application, mounting and hydraulic operating conditions. Check the exact breaker version before connecting it: a carrier-weight band, matching hoses or a “high flow” setting cannot establish the whole installation. Epiroc’s standard SB 202 lists 35–65 L/min flow and 100–150 bar operating pressure; the July 2025 manual gives different conditions for the SB 202 Tunnel. Its return-pressure acceptance figure also carries a reduced-performance qualification, so it must not become a target setting. Compare operating pressure, protective relief settings and return restrictions as separate quantities. Then confirm the permitted tool, working position, lubrication and stopping procedure for the job. A supplied 25 L/min is below the standard tool’s stated minimum, while 80 L/min exceeds its maximum; neither mismatch is resolved by choosing a larger mounting plate or assuming the breaker will regulate every unsuitable input itself.
Hydraulic breakers: compare standard SB 202 and Tunnel columns
| Named version | Flow | Operating pressure |
|---|---|---|
| SB 202 | 35–65 L/min | 100–150 bar |
| SB 202 Tunnel | 40–70 L/min | 100–110 bar |
Which published SB 202 figures belong in a first compatibility screen?
The standard SB 202 product reference lists a 2.5–6 tonne carrier class, 200 kg service weight, 35–65 L/min flow and 100–150 bar operating pressure. The carrier qualification applies to standard machines.
Variations require agreement under that reference. These figures screen a proposed package; they do not approve every machine in that weight band or every boom and adapter arrangement.
How do 25 L/min and 80 L/min compare with the standard flow range?
A hypothetical 25 L/min supply is 10 L/min below the minimum, while an 80 L/min supply is 15 L/min above the maximum. Identify the carrier’s controllable auxiliary supply under the required operating conditions and have the approved installation set accordingly. Catalog pump flow or a mode name cannot establish the actual breaker flow, pressure or sustained performance.
Can the standard and Tunnel SB 202 hydraulic figures be mixed?
No: the July 2025 safety manual 9800 0648 01, printed page 29, lists standard flow at 35–65 L/min and 100–150 bar, versus 40–70 L/min and 100–110 bar for the Tunnel model. Keep each hydraulic column with its named model. Do not combine maxima from different model columns.
Keep operating, relief and return pressures distinct
Is the breaker’s relief-valve figure its normal operating pressure?
The manual separately lists a 170 bar pressure-relief valve on the standard SB 202 and a lower operating-pressure range. These labels describe different functions, and the protective valve figure is not an instruction to operate at that pressure or set the carrier to it.
Follow the installation procedure and measurement conditions. Operating pressure and protective relief describe different functions.
Why is the published back-pressure acceptance not a performance target?
The manual’s acceptance row has a footnote stating that the breaker still runs regularly but at significantly reduced performance. The acceptance footnote does not specify a design target.
Check the return path and installation limits. Retain the reduced-performance qualification with the acceptance number.
How does a main return differ from a case-drain connection?
The main return carries the circuit’s operating oil through its specified route; a separate case drain, if the identified product requires one, handles leakage under its own restrictions. A low-pressure return need not be a case drain. Use the actual breaker and carrier schematic, including connector functions, instead of assigning hose duties from their number or apparent size.
Identify the fitted mass and working instructions
Does service weight mean a bare breaker housing?
Read the service-weight inclusions first. Epiroc defines the product-page service weight with a standard working tool and average-sized adapter plate, so adding an assumed adapter again could double-count mass. A different actual plate or tool still needs its own weight and approved arrangement; the catalog service figure is not a scale measurement of every delivered unit.
How long does the SB manual permit working one unbroken spot?
The July 2025 manual, printed page 19, instructs moving to a new position if material does not break after 15 seconds. The same instructions prohibit bending with the tool.
They also require avoiding idle strokes. These are instructions for the covered SB products, not a universal work interval for every hammer or evidence that a longer burst diagnoses the cause of overheating.
Check protection features, lubricant and special applications
Does automatic blank-firing protection remove the need for correct operation?
Epiroc’s HB 10000 DP reference describes its Intelligent Protection System, combining start behavior and automatic stopping when the tool breaks through. The protection feature belongs to that named HB model.
Do not assume identical equipment on SB 202. Protection features do not authorize using a breaker as a pry bar or ignoring its operating instructions.
Can ordinary bearing grease replace the specified breaker lubricant?
Epiroc’s chisel-paste guidance explains that the tool/bushing interface needs lubricant suited to its heat and contact conditions. Use the specified chisel lubricant and application procedure. An automatic greaser still needs the correct supply and inspection; neither a filled cartridge nor ordinary carrier greasing proves the working-tool lubrication is correct.
Does a breaker advertised for underwater work need a different setup?
The SB manual gives an underwater procedure with compressed-air protection and directs users to the authorized workshop for instructions. Above-ground installation does not establish underwater suitability.
Establish the approved underwater procedure. Include air, hydraulics and environmental controls for the actual tool.
What should happen if the blows weaken or the tool becomes abnormally hot?
Stop and use the identified troubleshooting procedure with qualified service support for pressurized checks. The symptom cannot identify the failed component.
Gather evidence of installation, flow, pressure, lubrication and tool condition. Do not raise a relief setting or continue hammering simply to test a guess, and isolate stored energy before any permitted inspection.
Compare the available and required hydraulic inputs, then review the Attachments for excavators: excavator carrier arrangement and Excavator couplers and thumbs: coupler locking. Find other tools in the Attachments: attachment directory.
Give the blow a supported path into the material
Breaking depends on the working tool transmitting the piston blow into the material. If the tool loses its support after breakthrough, continued strokes load the breaker's own components instead. Stop the hammer when the material breaks through.
Testing a breaker by striking in the air is a different action from a controlled operating check under the product's instructions.
Choose the position and working tool for the material being broken. An existing edge or crack can provide a release path, while repeatedly hammering an unproductive position can generate heat without the intended fracture. The cited SB instructions give a repositioning interval and prohibit bending with the tool.
Move to a suitable new position rather than using the tool steel to prise a fragment loose.
Keep alignment and support through the permitted working movement. Side loading acts on the tool guides instead of directing the blow along the intended tool axis. The required carrier setup, tool and down pressure belong to the identified breaker installation; adding carrier force is not a general remedy for a tool that is making little progress.
Separate a changed symptom from its cause
A change in sound, strike behavior or progress gives an observation to investigate. Record whether it occurs on every material, after warming, at one working position or with a particular tool. Noise alone cannot identify worn bushings, a supply fault or idle strokes.
Use the appropriate inspection and diagnostic procedure instead of treating a sound as a confirmed internal failure.
Include lubrication in the operating plan. Identify the specified product, application method and service interval for that hammer; ordinary bearing grease and breaker paste are not interchangeable descriptions. Inspect the working tool and retaining arrangement under the required shutdown and support procedure.
Automatic lubrication or protective controls still need their prescribed checks, and a feature fitted to another breaker does not establish what is installed on the one being hired or bought.