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 & piston cup repair kit is specially developed for MSB series MS250 / MS300 hydraulic rock breakers, widely matched on medium and large excavators for construction crushing operations. The full set includes accumulator diaphragm, impact piston leather cup, O-rings, gaskets and auxiliary sealing rings for complete breaker overhaul maintenance.
Produced with imported high-toughness FKM fluororubber and reinforced nylon base layer, the product boasts outstanding oil resistance, anti-fatigue impact resistance and tear resistance. It fully replaces original MSB breaker sealing parts, effectively solving common failures such as nitrogen leakage, pressure attenuation, weak impact force and frequent diaphragm rupture, greatly extending the continuous working life of hydraulic breakers under high-frequency impact heavy load conditions.
Item |
Detailed Parameter |
Product Name |
MSB MS250 MS300 Breaker Diaphragm & Cup Seal Kit |
Applicable Model |
MSB MS250 / MSB MS300 Hydraulic Rock Breaker |
Compatible Series |
MSB Medium & Large Hydraulic Hammer Series |
Main Material |
Imported High-Elastic FKM Fluororubber + Reinforced Fiber Base Layer |
Max Working Pressure |
26MPa |
Working Temperature |
-30°C ~ 120°C |
Kit Contents |
Accumulator diaphragm, impact piston leather cup, O-rings, gaskets, backup rings, full overhaul sealing accessories |
Cross Reference OEM No. |
MSB-MS250, MSB-MS300, BR-250300DIAP |
Net Weight |
Approximately 0.9kg |
Applicable System |
Hydraulic breaker nitrogen accumulator & impact piston sealing system |
Warranty |
12 Months |
Fully dimensionally consistent with original MSB MS250/MS300 breaker parts, matching OEM part numbers MSB-MS250, MSB-MS300 and BR-250300DIAP. No cutting, grinding or modification required for one-step installation, perfectly fitting accumulator and piston assembly cavities.
Core diaphragm and leather cup adopt enhanced FKM rubber with fiber reinforcement layer, featuring ultra-high tear resistance, hydraulic oil corrosion resistance and long-term anti-aging performance. Stable elastic recovery maintained at -30°C to 120°C, avoiding hardening, cracking and deformation under long-time high-frequency impact.
All finished parts pass strict 26MPa high pressure fatigue impact test before delivery. Effectively block nitrogen leakage of accumulator and internal hydraulic oil seepage, keep stable impact pressure output, eliminate weak breaking force and frequent refilling nitrogen faults, lower machine failure downtime.
All sealing consumables required for full disassembly and overhaul of MS250/MS300 breaker are included in one set. Integrated matching parts save separate procurement time for repair shops, greatly shorten equipment maintenance cycle and reduce overall operation cost of construction machinery.
Every batch of diaphragm and leather cup undergoes air tightness test, high-frequency impact fatigue test and high-low temperature aging test, strictly meeting OEM production standards. Stable and reliable performance for long-term continuous heavy construction work.
Suitable for MSB MS250 / MS300 hydraulic rock breakers equipped on various medium and large construction 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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