How to Choose the Right Seal Kit for Your Hydraulic Rock Breaker
This guide is designed for contractors, mechanics, and equipment operators who need the correct aftermarket seal kit the first time — saving downtime and money.
Why the Right Seal Kit Matters
Hydraulic rock breakers operate under extreme conditions: high pressure (2000-3500+ psi), intense vibration, heat spikes, and constant contamination from dust and debris. A mismatched or low-quality seal kit leads to:
- Oil leaks
- Loss of striking power
- Premature failure of the piston and cylinder
- Expensive downtime
Choosing the right kit ensures exact fitment, proper sealing, and longer service life.
Step-by-Step Guide to Choosing the Right Seal Kit
Identify Your Breaker Brand and Model
Start with the manufacturer name and exact model number (e.g., Epiroc HB2000, Rammer S-86, Atlas Copco SB-302, Bobcat B700, etc.).
This is the most critical piece of information.
Find the Serial Number
The serial number (usually stamped on the breaker body or data plate) is the key to perfect compatibility. Many breakers have slight variations within the same model year or series.
Tip: Take a clear photo of the serial plate and send it to us at sealkitcity@gmail.com if you’re unsure.
Know Your Seal Kit Requirements
Most rock breaker seal kits include:
- Rod seals (main dynamic seals)
- Piston seals
- Wiper seals / scraper rings
- O-rings and backup rings
- Buffer seals
- Dust seals
Match the kit to your breaker’s exact hydraulic specifications.
Choose the Right Materials
Quality matters more than price:
HNBR (Hydrogenated Nitrile): Best balance of oil resistance, heat resistance (up to 300°F), and durability — ideal for most applications.
Polyurethane (PU): Superior abrasion resistance and toughness — excellent for high-vibration demolition work.
NBR (Standard Nitrile): Good for lighter-duty or lower-temperature use.
FKM/Viton: For extreme heat or aggressive oils.
At Seal Kit City we stock premium aftermarket kits using the best material combinations for real-world performance.
Verify Compatibility
Confirm the kit is designed for your exact breaker model and serial range.
Check pressure rating (should match or exceed your breaker’s operating pressure).
Look for “OEM-compatible” or “exact fit” claims from reputable suppliers.
Consider Your Operating Conditions
Heavy demolition / mining → Choose polyurethane or high-grade HNBR kits.
Rental fleet / daily use → Prioritize kits with longer service intervals.
Extreme heat or contaminated oil → Opt for Viton or upgraded materials.
Common Mistakes to Avoid
Buying based only on model number without serial number verification.
Choosing the cheapest kit — it often fails faster and costs more in downtime.
Ignoring material specs — a generic rubber kit won’t last in a high-impact breaker.
Forgetting related parts — many jobs also require a new diaphragm at the same time.
How Seal Kit City Makes It Easy
We specialize exclusively in hydraulic rock breaker seal kits and high-pressure diaphragms.
Just tell us:
- Breaker brand
- Model
- Serial number
…and we’ll give you the exact aftermarket seal kit you need — fast and accurately.
Call 844-2-SEALKIT right now for expert help, or use the Search by Make & Model tool on our homepage.