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 piston cup & diaphragm repair kit is specially developed for MSB MS500 / MS520 hydraulic rock breakers, widely matched with 6–12 ton excavators for demolition, mining and road construction works. The set contains complete energy storage leather cups, main diaphragms, auxiliary O-rings and wear-resistant backing rings for full accumulator overhaul.
Adopted imported modified NBR and high-performance FKM fluororubber with reinforced fiber vulcanization process, the parts feature outstanding oil resistance, low-temperature flexibility, anti-fatigue and high-frequency impact resistance. It perfectly replaces original MSB diaphragm & piston cup parts, solves common faults like nitrogen leakage, impact power attenuation, diaphragm cracking and frequent replacement, greatly extending breaker continuous operation life under long-time heavy impact working conditions.
Item |
Detailed Parameter |
Product Name |
MSB MS500 MS520 Breaker Accumulator Piston Cup & Diaphragm Kit |
Applicable Model |
MSB MS500, MSB MS520 Hydraulic Rock Breaker |
Compatible Series |
MSB Medium-size Hydraulic Hammer Series |
Main Material |
Imported Modified NBR / FKM Fluororubber + Fiber Reinforced Backing Ring |
Max Working Pressure |
26MPa |
Working Temperature |
-30°C ~ 120°C |
Kit Contents |
Accumulator piston cup, energy storage diaphragm, O-rings, dust seals, wear rings, full overhaul sealing accessories |
Cross Reference OEM No. |
MSB-500-DIA, MSB-520-CUP, 3070405012 |
Net Weight |
Approximately 0.68kg |
Applicable System |
Hydraulic breaker nitrogen accumulator energy storage system |
Warranty |
12 Months |
Fully dimensionally consistent with original MSB MS500/MS520 breaker parts, matching OEM part numbers MSB-500-DIA, MSB-520-CUP and 3070405012. No cutting, grinding or modification required, plug-and-play installation for quick maintenance.
Core piston cup and diaphragm adopt fiber-reinforced FKM composite rubber with secondary high-temperature vulcanization. Excellent hydraulic oil corrosion resistance, low-temperature non-hardening, anti-aging, stable elastic performance under -30°C to 120°C wide temperature range.
All components pass 26MPa ultra-high pressure fatigue test, withstand thousands of high-frequency reciprocating deformation per minute without cracking, delamination or permanent deformation. Effectively isolate nitrogen chamber and hydraulic oil circuit, eliminate internal nitrogen leakage and external oil seepage, maintain stable striking force of the breaker.
Integrates all leather cup, diaphragm and matching sealing accessories required for accumulator full maintenance. Complete spare parts reduce secondary purchasing time, shorten equipment downtime and lower overall maintenance cost of construction machinery.
Every finished kit undergoes air tightness, high-pressure burst, aging and impact fatigue tests before delivery, fully meets OEM production standards, guarantees stable long-term performance in harsh construction sites.
Suitable for MSB MS500 / MS520 hydraulic breakers mounted on various engineering equipment:
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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