33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
This heavy-duty accumulator diaphragm & seal cup kit is specially developed for JAB RB21 and RB25 hydraulic rock breakers, widely matched on medium & small excavator-mounted hydraulic hammers for construction demolition, rock crushing and mining work. The package includes dedicated energy storage diaphragm, main seal cup, auxiliary O-rings and gaskets for full accumulator overhaul.
Manufactured with imported reinforced FKM fluororubber + high-toughness modified NBR composite material, the product features outstanding oil resistance, high-frequency fatigue resistance, low-temperature elasticity and anti-aging performance. It perfectly replaces original JAB OEM rubber parts, solves typical faults such as nitrogen-oil mixing, accumulator pressure loss, weak breaking impact and short service life, and stabilizes hammer output under long-time continuous heavy load operation.
Item |
Detailed Parameter |
Product Name |
JAB RB21 RB25 Hydraulic Breaker Accumulator Diaphragm & Seal Cup Kit |
Applicable Model |
JAB RB21 / JAB RB25 Rock Breaker |
Compatible Series |
JAB RB Series Medium-Sized Hydraulic Hammer |
Main Material |
Imported Reinforced FKM + Modified NBR Composite Rubber |
Max Working Pressure |
26.0MPa |
Working Temperature |
-25°C ~ 120°C |
Kit Contents |
Accumulator diaphragm, main seal cup, O-rings, flat gaskets, full overhaul sealing accessories |
Cross Reference OEM No. |
JAB-RB21, JAB-RB25, 3071209618 |
Net Weight |
Approximately 0.62kg |
Applicable System |
Hydraulic breaker nitrogen accumulator energy storage system |
Warranty |
12 Months |
Fully dimensionally matched with original JAB RB21 & RB25 hydraulic breakers, consistent with OEM part numbers JAB-RB21, JAB-RB25 and 3071209618. Zero modification required for direct installation, seamless assembly without oil leakage or pressure drop.
Core diaphragm and seal cup adopt high-performance FKM + reinforced modified NBR dual composite formula, with high rebound and anti-fatigue property. Stable elasticity maintained from -25°C low temperature to 120°C high hydraulic oil temperature, resistant to hydraulic oil corrosion and long-term high-frequency stretching fracture.
All components pass strict 26.0MPa high-pressure cycle fatigue test, effectively isolate nitrogen chamber and hydraulic oil circuit. Eliminate internal mixing of oil and nitrogen, keep stable accumulator energy storage pressure, guarantee continuous strong breaking impact force of the hammer without power attenuation.
Contains all sealing rubber parts required for RB21/RB25 accumulator maintenance, one-stop matching without separate purchasing scattered accessories. Greatly shorten equipment repair downtime and reduce overall machinery maintenance cost.
Every diaphragm & seal cup kit undergoes air tightness, high-pressure fatigue and high-temperature aging tests before delivery, fully meets JAB OEM manufacturing standards. Stable long-term performance for heavy-duty construction sites, lower failure rate than ordinary domestic rubber parts.
Suitable for JAB RB21 and RB25 hydraulic rock breakers equipped on various engineering heavy machinery:
Welcome to HOVOO, a Chinese seal factory. Production of PU, Rubber and PTFE seals. The seals include O-ring, piston seal, rod seal, Gray ring and gas seal.
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