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 MTB MTB500 / LB500 hydraulic rock breakers, widely fitted on medium & large excavators for mining, demolition and rock crushing operations. The package includes integral energy storage diaphragm, high-pressure piston cup, matching O-rings, gaskets and anti-extrusion backup rings for complete breaker accumulator overhaul.
Manufactured with reinforced imported modified HNBR and FKM fluororubber with fabric interlayer, the product delivers outstanding high-pressure resistance, anti-fatigue elasticity, hydraulic oil resistance and low-temperature toughness. It perfectly matches original MTB OEM dimensions, solves frequent failures such as nitrogen leakage, insufficient impact force, diaphragm cracking and pressure attenuation, and greatly extends continuous service life under high-frequency heavy impact working conditions.
Item |
Detailed Parameter |
Product Name |
MTB500 LB500 Breaker Accumulator Diaphragm & Cup Seal Kit |
Applicable Model |
MTB500 / LB500 Hydraulic Rock Breaker |
Compatible Series |
MTB Large-Size Hydraulic Hammer Series |
Main Material |
Fabric-reinforced Imported HNBR / FKM Fluororubber + Hardened Backup Ring |
Max Working Pressure |
32MPa |
Working Temperature |
-30°C ~ 125°C |
Kit Contents |
Energy storage diaphragm, piston cup, O-rings, sealing gaskets, anti-extrusion backup rings, full accumulator repair parts |
Cross Reference OEM No. |
MTB500-DIA, LB500-CUP, 86395821 |
Net Weight |
Approximately 1.1kg |
Applicable System |
Breaker nitrogen accumulator energy storage hydraulic system |
Warranty |
12 Months |
Fully dimensional compatible with original MTB500 and LB500 hydraulic breakers, matching OEM part numbers MTB500-DIA, LB500-CUP and 86395821. No cutting, grinding or modification required for direct field installation.
Core diaphragm and piston cup adopt high-performance fabric-reinforced HNBR + FKM composite rubber. The interlayer cloth eliminates stretch rupture under high-frequency reciprocating deformation, with excellent oil aging resistance, abrasion resistance and wide temperature adaptability from -30°C to 125°C.
All sealing assemblies pass strict 32MPa burst and fatigue cycle testing. It completely isolates nitrogen chamber and hydraulic oil circuit, stops internal cross-leakage, maintains stable accumulator pressure and consistent breaker impact power without force drop during long-hour crushing.
Contains all matching sealing accessories required for full accumulator disassembly and maintenance. Integrated matching parts avoid separate procurement of scattered seals, shorten on-site repair downtime and lower equipment maintenance cost.
Every set undergoes air tightness testing, high-pressure fatigue cycling and thermal aging screening before delivery. All products meet MTB original equipment technical standards to guarantee stable long-term performance in harsh mining and demolition environments.
Suitable for MTB500 / LB500 hydraulic rock breakers mounted on all types of heavy-duty construction 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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