Bobcat Hydraulic Breaker Seal Kit & Diaphragm Fitment Guide
If you run a Bobcat hydraulic breaker, keeping your seal kit and diaphragm in good condition is the difference between a productive day on the job and an unexpected shutdown. This guide walks you through how to identify the right parts for your breaker model and what to look for when ordering.
Why Seal Kits and Diaphragms Fail
Hydraulic breakers operate under extreme pressure and repetitive impact. Over time, the seals that contain hydraulic fluid degrade from heat, contamination, and wear. The diaphragm — which separates the nitrogen gas charge from the hydraulic oil — is equally vulnerable. When either fails, you'll notice:
- Hydraulic fluid leaking from the breaker body
- Loss of impact power or erratic cycling
- Nitrogen gas charge that won't hold
- Visible cracking or deformation on the diaphragm
Catching these signs early and replacing parts proactively saves you from a full breaker rebuild.
Bobcat Seal Kit Selection
Bobcat hydraulic breakers use model-specific seal kits. Using the wrong kit risks improper fitment, premature failure, and potential damage to the breaker cylinder. When ordering, you'll need your breaker model number, which is typically found on the breaker's data plate or in your equipment documentation.
Browse our full selection of Bobcat Seal Kits to find the kit matched to your model.
Low Pressure vs. High Pressure Diaphragms
Not all Bobcat diaphragms are interchangeable. Bobcat breakers use either a low pressure or high pressure diaphragm depending on the model and nitrogen charge specification. Installing the wrong type can result in immediate failure or unsafe operating pressure.
- Bobcat Low Pressure Diaphragms — for models operating at standard nitrogen charge pressures
- Bobcat High Pressure Diaphragms — for models requiring elevated nitrogen charge
If you're unsure which type your breaker requires, check your operator's manual or contact us — we're happy to help you confirm fitment before you order.
Ordering Tips
- Always have your breaker model and serial number on hand
- Replace the seal kit and diaphragm together when doing a service — labor is the same and it prevents a second teardown shortly after
- Use only quality aftermarket or OEM-spec parts; cheap seals fail faster and can damage the cylinder bore
Browse the full Bobcat parts collection or go straight to Bobcat Seal Kits and Bobcat Diaphragms to find your parts today.