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High hardness 42CrMo SB121 hydraulic breaker piston for Soosan SB121 excavator hammer, fully heat treated wear-resistant replacement spare parts.
Working Principle
Return stroke: High-pressure hydraulic oil enters piston lower cavity, push piston upward to compress rear accumulator nitrogen, hydraulic energy converts into nitrogen compression potential energy for storage.
Commutation stage: Piston moves to upper limit to trigger main reversing valve, hydraulic oil circuit instantly switch flow direction.
Power stroke: High-pressure oil flows into piston upper cavity + expanded nitrogen releases stored energy, dual force push piston accelerate downward at high speed.
Impact working: Piston bottom end face strike chisel instantly, mechanical impact force transfers to rock & concrete for breaking operation.
Single blow finished, oil circuit reset, piston starts new round return stroke, cycle continuous striking work.
English Item
Technical Data
Product Name
SB121 Hydraulic Breaker Alloy Piston
Applicable Model
Soosan SB121,SB121TS,SB121TR
Matching Excavator
28~35 Ton Heavy Excavator
Raw Material
High-grade 42CrMo Alloy Steel
Surface Hardness
HRC59~63
Core Hardness
HRC40~44
Working Pressure
105~132MPa
Matching Clearance
0.05~0.07mm
Advanced Production Technology
Raw steel incoming inspection: material spectrum analysis, tensile strength & metallographic detection, reject inferior alloy blank.
High-temperature free forging to compact internal metal grain, remove internal material shrinkage cavity & loose defect.
Rough turning + semi-finish turning via CNC machining center to reserve finishing allowance.
Precision cylindrical grinding + end face surface grinding to control size tolerance within OEM standard.
Appearance full inspection one by one: screen crack, bump, dimensional out-of-tolerance defective products.
Random loading impact fatigue test & clearance fitting test before finished storage.
FAQ
Q1: Which breaker fits this SB121 alloy piston?
A1: Specially matched for Soosan SB121,SB121TS,SB121TR hydraulic breaker for 28~35 ton excavator.
Q2: What raw material is your SB121 piston made from?
A2: Premium forged 42CrMo alloy steel with full professional heat treatment.
Q3: What causes original piston transverse crack during working?
A3: Inferior raw material, unqualified heat treatment, overfilled nitrogen pressure or long-time overload operation.
Q4: Can I buy single piece sample before bulk order?
A4: Sample purchase is available, big bulk order gets preferential tiered price and priority shipment.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2008
Total Annual:
20000000-25000000
Employee Number:
90~100
Ecer Certification：
Verified Supplier
Guangzhou Liantuo Machinery Trading Company is a professional cross-border supplier specializing in full-series excavator and construction machinery spare parts. We cover a complete product range, including hydraulic parts, undercarriage components, engine core parts, electrical control parts, sle...
Guangzhou Liantuo Machinery Trading Company is a professional cross-border supplier specializing in full-series excavator and construction machinery spare parts. We cover a complete product range, including hydraulic parts, undercarriage components, engine core parts, electrical control parts, sle...
