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This reinforced boom hydraulic cylinder is engineered as a direct bolt-on aftermarket replacement exclusively for Komatsu PC300HD-7L heavy rock-spec excavator, a specialized 7-series heavy machine built for severe rock-breaking, stone quarrying, mountain blasting residue cleanup and high-load bulk earthmoving projects. As the core load-bearing lifting component of front attachments, it sustains extreme shock and heavy static loads during frequent boom lifting and lowering in harsh rock worksites. It is a priority stocked spare for rock quarry maintenance workshops, heavy demolition contractors and cross-border spare parts traders focusing on Komatsu HD heavy-duty rock excavator variants.
Every production link strictly adheres to Komatsu original OEM rock-duty hydraulic drawings and ultra-tight assembly tolerances. Critical mounting dimensions including lug center distance, pin bore inner diameter, extra thick anti-wear copper bushing specifications and hydraulic port layout fully match dedicated OEM part number 707-01-0A430. No cutting, grinding or welding modification is required during installation, slashing mechanical labor costs and preventing costly long-term construction shutdowns caused by hard-to-source original boom cylinders for specialized PC300HD-7L rock machines.
2.Basic Product Information Table
Item
Detailed Specification
Full Product Name
Complete Boom Hydraulic Cylinder Assembly
Applicable Machinery
Komatsu PC300HD-7L Heavy Rock Specification Crawler Excavator
12-month full warranty covering all factory manufacturing defects
Minimum Order Quantity
1 unit, large ready stock available for fast global dispatch
QC Inspection Standard
ISO9001 full-process traceable production; 100% high-pressure hydrostatic leak test + full-stroke ultra-heavy reciprocating fatigue impact testing before shipment
3.Core Technical Parameters
#
Part No.
Description
Qty
G-1
(707-01-XZ960)
CYLINDER GROUP,L.H. (FINAL COATING)
1
G-2
(707-01-XZ970)
CYLINDER GROUP,R.H. (FINAL COATING)
1
----
====================
1
707-01-0A430
BOOM CYLINDER ASS'Y
1
1
707-13-14580
Cylinder
1
2
707-76-90490
Bushing
1
3
07145-00090
SEAL,DUST (KIT)
2
4
07020-00000
FITTING, GREASE - UPPER HINGE PIN
1
5
07043-00108
PLUG,(WITHOUT OIL PRESSURE SWITCH)
1
6
707-58-10720
Rod
1
7
707-76-10290
Bushing
1
8
07145-00100
SEAL,DUST (KIT)
2
9
707-71-34800
COLLAR
1
10
707-35-91420
RING,BACK-UP (KIT)
2
11
07000-15130
O-RING,(F4350-51A0 -17 )
1
12
707-71-61090
PLUNGER
1
13
707-27-14930
HEAD,CYLINDER
1
14
176-63-56170
SEAL,DUST (KIT)
1
15
07179-13114
RING,SNAP (KIT)
1
16
707-52-90780
Bushing
1
17
707-51-10030
PACKING,ROD (KIT)
1
18
707-51-10640
RING,BUFFER (KIT)
1
19
707-35-91420
RING,BACK-UP (KIT)
1
20
07000-15130
O-RING,(F4350-51A0 -17 )
1
21
01010-81875
BOLT (KIT)
12
22
707-41-11840
Washer
12
23
707-36-14650
Piston
1
24
01310-01216
SCREW,NYLON
1
25
707-44-14180
RING,PISTON (KIT)
1
26
707-39-14110
RING,WEAR (KIT)
2
27
707-44-14910
Ring
2
28
07001-05090
RING,BACK-UP (KIT)
2
29
07000-15090
O-RING,GREASE PUMP STRAP
1
30
707-86-11580
TUBE,L.H
1
30
707-86-11590
TUBE,R.H
1
31
207-63-54580
TUBE,L.H
1
31
207-63-54680
TUBE,R.H
1
32
01435-01055
BOLT, MOUNT DRYER TO BRACKET AND FRAME
8
33
07000-13035
O-RING, UPPER COOLER INLET AND OUTLET PORTS
2
34
207-63-54590
Bracket
1
35
707-88-21370
BAND
1
36
01435-01235
BOLT,R.H. (FOR ADD. AIR COMPRESSOR)
4
37
07283-23442
CLIP,(WITH UNDER MIRROR)
1
38
01643-31032
WASHER,(WITH AUTO EMERGENCY STEERING)
2
39
01599-01011
NUT,(WITH UNDER MIRROR)
2
40
01435-01025
BOLT, MOUNT ENGINE OIL DRAIN TO FUEL TANK
2
41
707-88-33040
CAP,SLEEVE (FOR SHIPPING)
2
42
07371-31049
FLANGE, SPLIT - DIVIDER VALVE END
4
43
07372-21035
BOLT, SPLIT FLANGE - TORQUE CONVERTER END
8
44
01643-51032
WASHER, (WITHOUT EMERGENCY STEERING)
8
----
====================
K
707-99-58080
SERVICE KIT
2
Technical Index
Standard Value
Cylinder Tube Inner Bore
140 mm
Hard Chrome Plated Piston Rod Diameter
92 mm
Effective Working Stroke
1490 mm
System Rated Working Pressure
33 MPa
Factory Hydraulic Proof Test Pressure
49.5 MPa (1.5 times rated working pressure for full internal & external leak inspection)
Cylinder Tube Raw Material
Super high tensile seamless alloy steel with deep precision internal honing, mirror smooth abrasion-resistant inner wall to withstand continuous heavy hydraulic oil circulation under round-the-clock rock quarry high-load cycles
Piston Rod Surface Treatment
Modified 40CrMo quenched & tempered high-strength base alloy, 30–36μm ultra-dense hard chrome overlay, surface hardness HRC69–73. Exceptional scratch, bend and impact resistance against jagged sharp rock fragments, blasted stone chunks and concrete rubble
Matching Special Seal Kit PN
707-01-0A430-KIT
Applicable Operating Temperature Range
-28℃ ~ +90℃
Structural Design Feature
Oversized super-thick integrated boom connection lugs fitted with heavy-duty thick-wall self-lubricating copper wear bushings; dual-stage reinforced internal buffer system to absorb violent instantaneous shock from repeated full-load boom lifting/lowering in rock breaking operations
Core Competitive Advantages
Exclusive PN Custom Fit Only for Specialized PC300HD-7L Rock Excavator
Part number 707-01-0A430 is a custom boom cylinder made solely for Komatsu PC300HD-7L heavy rock variant, incompatible with standard PC300-7, PC350-7 and other general-purpose 7-series excavators. All connection geometric dimensions fully replicate genuine Komatsu HD rock-duty OEM components, perfectly aligning with reinforced factory boom linkages and original hydraulic piping layout. It completely eliminates assembly offset problems that trigger rapid seal failure and persistent oil leakage when generic standard cylinders are forced onto reinforced rock-spec machine frames.
Rock-Site Targeted Heavy Reinforcement Upgrade for HD-7L High-Impact Working Conditions
Ordinary standard thin-wall hydraulic cylinders cannot endure continuous alternating extreme impact loads of PC300HD-7L operating in quarries and demolition sites. This model significantly thickens cylinder barrel wall and cast integrated lug structural strength customized for the high-shock rock-breaking cycle of Komatsu HD heavy excavators. It withstands daily violent rock collisions and sustained heavy lifting loads, delivering far longer service life than ordinary general aftermarket cylinders unsuitable for severe rock working environments.
Dual Independent Offline Pre-Delivery Testing to Eliminate All Hidden Defect Risks
Each finished boom cylinder undergoes two separate rigorous offline testing procedures before leaving the factory. Full-stroke reciprocating fatigue testing simulates months of non-stop full-load rock quarry excavation to validate integral structural bearing rigidity; prolonged high-pressure soaking tightness inspection scans every internal and external oil leakage blind spot. All defective finished goods are fully filtered out before warehousing to avoid catastrophic unplanned quarry production shutdown losses for rock contractors and mine operators.
Optimized Long-Term Maintenance Cost for PC300HD-7L Rock Excavator Fleet Owners
Genuine Komatsu OEM spare parts for specialized PC300HD-7L rock machines are globally scarce, with steep retail prices and extremely long international supply lead times. This aftermarket boom cylinder provides equivalent load-bearing rigidity, stable low-vibration operation and full service lifespan as original factory components at a competitive unit price, drastically cutting recurring high maintenance expenses for large quarry repair yards and heavy demolition equipment leasing enterprises with fleets of PC300HD-7L machines.
Multi-Mode Global Logistics Adapted for Remote Mountain Quarry Job Sites
All in-stock products can be shipped within 3 working days once payment is confirmed. Air freight handles emergency urgent orders for sudden cylinder failures at isolated mountain rock mines; consolidated bulk sea freight and full FCL container transport offer cost-efficient wholesale delivery plans for machinery distributors supplying quarry and demolition markets across Africa, Southeast Asia, the Middle East and Latin America.
Factory Manufacturing Strength
Our factory has over ten years of targeted R&D and mass production experience for heavy rock-duty hydraulic cylinders matching Komatsu 7-series HD heavy excavators, with flagship PC300HD-7L as one of our core mature production lines. We operate a complete closed-loop production workflow including large heavy precision forging, deep inner honing, integral overall heat treatment and automated ultra-thick chrome plating. Exclusive high-impact rock-site load simulation test benches replicate harsh blasting and quarry working environments to continuously optimize product shock resistance and long-term wear durability. Our heavy rock-duty aftermarket hydraulic cylinder product line is exported worldwide year-round, maintaining stable long-term cooperative partnerships and consistent high customer feedback from global heavy machinery spare parts distributors, relying on precise exclusive HD rock-spec model matching and unified strict stable quality standards.
Regular Customer FAQ
Q1: Can this boom cylinder fit standard Komatsu PC300-7 or PC350-7 excavators?
A: Cross-model installation is not supported. General and HD rock-spec excavators adopt exclusive non-interchangeable OEM part numbers and unique reinforced lug mounting dimensions. Please confirm your machine full model with HD rock specification before ordering.
Q2: Does standard delivery package include the matching seal repair kit?
A: Standard packaging only contains the complete boom cylinder assembly. Dedicated 707-01-0A430-KIT seal kit needs separate purchase, and we provide preferential bundled quotations for clients purchasing cylinder and seal kit together.
Q3: What anti-rust and anti-collision protection for long ocean shipping?
A: Anti-rust hydraulic oil is fully filled into front and rear cylinder chambers to prevent internal corrosion; thick high-temperature anti-rust grease is evenly coated on the whole exposed piston rod surface. The full cylinder assembly is wrapped with multi-layer heavy waterproof PE film and fixed inside reinforced extra-large thick plywood export crates to avoid scratches, impact deformation and moisture corrosion during lengthy cross-ocean transit.
Q4: Are tiered volume discounts available when buying full boom + arm + bucket cylinder set for PC300HD-7L?
A: Yes. Complete front working attachment cylinder set orders enjoy progressive bulk purchase discounts. Consolidated full-container sea shipping can also be arranged to reduce overall international logistics cost for large batch purchases.
Q5: What after-sales technical support if oil leakage occurs within the 12-month warranty period?
A: Please supply clear photos of leakage position plus excavator serial number for verification. We will promptly send free replacement seal accessories and detailed step-by-step remote maintenance guidance to resolve leakage faults without interrupting rock quarry and demolition construction schedules.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Year Established:
2013
Total Annual:
$28000000-$41660000
Employee Number:
1200~1300
Ecer Certification：
Verified Supplier
Since 2013
Excavator Hydraulic Parts Manufacturer & Global Supplier Since 2013
Belparts Machinery Limited — Your Trusted Partner in Excavator Hydraulic Parts
Who We Are
Founded in September 2013 and headquartered in Guangzhou, China's premier engineering machinery hub, Belparts ha...
Since 2013
Excavator Hydraulic Parts Manufacturer & Global Supplier Since 2013
Belparts Machinery Limited — Your Trusted Partner in Excavator Hydraulic Parts
Who We Are
Founded in September 2013 and headquartered in Guangzhou, China's premier engineering machinery hub, Belparts ha...
