BELPARTS MACHINERY LIMITED
| Certifiion | CE |
| Part name | Hydraulic Arm Cylinder |
| Part number | 203-63-02722 |
| Payment Terms | L/C,D/A,D/P,T/T,TRADE ASSURANCE,WEST UNION,PAYPAL |
| Warranty | 1 Year |
| Quality | Aftermarket High Quality |
| Supply Ability | 100 PCS / Months |
| Shipment | DHL FEDEX TNT EMS UPS / Ses / Air |
| Delivery Time | 3-7 Day |
| Condition | New |
| Emission standards | Stage V |
| Model | PC128US-1 |
| Packaging Details | Wooden Case Packing |
| Appliion | Excavator |
| Model Number | PC128US-1 |
| Brand Name | Belparts |
| Place of Origin | China |
View Detail Information
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Product Specification
| Certifiion | CE | Part name | Hydraulic Arm Cylinder |
| Part number | 203-63-02722 | Payment Terms | L/C,D/A,D/P,T/T,TRADE ASSURANCE,WEST UNION,PAYPAL |
| Warranty | 1 Year | Quality | Aftermarket High Quality |
| Supply Ability | 100 PCS / Months | Shipment | DHL FEDEX TNT EMS UPS / Ses / Air |
| Delivery Time | 3-7 Day | Condition | New |
| Emission standards | Stage V | Model | PC128US-1 |
| Packaging Details | Wooden Case Packing | Appliion | Excavator |
| Model Number | PC128US-1 | Brand Name | Belparts |
| Place of Origin | China | ||
| High Light | Hydraulic Arm Cylinder for Excavator ，Excavator Spare Parts Cylinder ，Aftermarket Hydraulic Cylinder Assy | ||
Komatsu PC128US-1 Hydraulic Arm Cylinder | PN:203-63-02722 | Premium Aftermarket Replacement
1. Basic Product Info
This high-quality aftermarket hydraulic stick cylinder is precision manufactured as a direct OEM replacement for Komatsu PC128US-1 zero-tail excavator. As the core hydraulic actuator of front working equipment, it controls arm extension and retraction to complete excavation, material grabbing, loading and site leveling tasks. Widely used in urban narrow-space construction, pipeline laying, landscaping and small earthmoving projects.
All cylinders are strictly produced per Komatsu original technical drawings, with fully consistent mounting dimensions, pin pitch and hydraulic port layout. Direct bolt-on installation without cutting, welding or any on-site secondary modifiion.
| Item | Specifiion |
|---|---|
| Product Name | Hydraulic Arm (Stick) Cylinder |
| Applicable Model | Komatsu PC128US-1 Zero Tail Excavator |
| OEM Part Number | 203-63-02722 |
| Product Grade | Brand New High-Quality Aftermarket |
| Warranty | 12 months against manufacturing defects |
| MOQ | 1 unit, sufficient stock for immediate dispatch |
| QC Standard | ISO9001 certified, full hydraulic pressure test & cyclic fatigue test before shipment |
2. Core Technical Parameters
| # | Part No. | Description | Qty |
|---|---|---|---|
| G1 | (203-63-X9040) | CYLINDER GROUP,(SEE FIG.Y1620-11A0C) | 1 |
| G1 | (203-63-X2722) | CYLINDER GROUP,ARM (SEE FIG.Y1620-11A0) | 1 |
| G1 | (203-63-X2721) | CYLINDER GROUP,(SEE FIG.Y1620-11A0B) | |
| ---- | ==================== | ||
| 1 | 203-63-02722 | CYLINDER ASS'Y,ARM | 1 |
| 1 | 203-63-02721 | CYLINDER ASS'Y,ARM | 1 |
| 1 | 203-63-65142 | CYLINDER,ARM | 1 |
| 1 | 203-63-65141 | CYLINDER,ARM | 1 |
| 2 | 707-76-70240 | Bushing | 1 |
| 3 | 07145-00070 | SEAL,DUST? PISTON ROD | 2 |
| 4 | 707-71-32530 | COLLAR | 1 |
| 5 | 07000-15105 | O-RING (KIT) | 1 |
| 6 | 707-35-91150 | RING,BACK-UP (KIT) | 2 |
| 7 | 707-27-11971 | HEAD,CYLINDER | 1 |
| 8 | 707-52-90500 | Bushing | 1 |
| 9 | 707-51-75030 | PACKING,ROD (KIT) | 1 |
| 10 | 707-51-75630 | RING,BUFFER (KIT) | 1 |
| 11 | 07000-15105 | O-RING (KIT) | 1 |
| 12 | 707-35-91150 | RING,BACK-UP (KIT) | 1 |
| 13 | 144-63-94170 | SEAL,DUST (KIT) | 1 |
| 14 | 07179-13089 | RING, SNAP | 1 |
| 15 | 01010-81670 | BOLT,(WITH WEAR GUARD) | 12 |
| 16 | 01643-51645 | WASHER, SPRING | 12 |
| 17 | 203-63-65121 | ROD,PISTON | 1 |
| 18 | 707-71-60200 | PLUNGER | 1 |
| 19 | 04260-00635 | BOWL, CHECK VALVE | 11 |
| 20 | 707-71-91270 | Cap | 1 |
| 21 | 707-76-70240 | Bushing | 1 |
| 22 | 07145-00070 | SEAL,DUST? PISTON ROD | 2 |
| 23 | 707-71-60870 | PLUNGER | 1 |
| 24 | 707-36-11661 | Piston | 1 |
| 25 | 707-44-11280 | RING,(Y1620-01A1-19) | 1 |
| 26 | 707-39-11510 | RING,(Y1620-01A1-20) | 2 |
| 27 | 707-44-11920 | Ring | 2 |
| 28 | 01310-01216 | SCREW,NYLON | 1 |
| 29 | 07000-15070 | O-RING (KIT) | 1 |
| 30 | 707-35-90360 | RING,BACK-UP (KIT) | 2 |
| 30A | 707-83-13010 | Valve | 1 |
| 30B | 07750-01628 | Spring | 1 |
| 30C | 707-87-14070 | Plug | 1 |
| 30D | 07002-12034 | O-RING,(FOR WITHOUT BRAKE ASSISTOR) | 1 |
| 31 | 203-63-65171 | Tube | 1 |
| 32 | 707-87-13570 | Elbow | 1 |
| 33 | 07000-13025 | O-RING,(SEE FIG. H0311-01A0-30) | 2 |
| 34 | 01010-50850 | BOLT (KIT) | 4 |
| 35 | 01010-50855 | BOLT,(10M) | 4 |
| 36 | 01643-50823 | WASHER,(FOR SHIPPING) | 8 |
| 37 | 707-88-95360 | BAND (PAINT(2)) | 1 |
| 38 | 707-88-95510 | BRACKET (PAINT(2)) | 1 |
| 39 | 01010-51035 | BOLT,(FOR QUICK SHIFT) (MITSUBISHI) | 2 |
| 40 | 01643-51032 | WASHER, (WITHOUT EMERGENCY STEERING) | 2 |
| 41 | 07283-22236 | U-BOLT, TUBE CLAMP | 1 |
| 42 | 01599-01011 | NUT,(WITH UNDER MIRROR) | 2 |
| 43 | 01643-31032 | WASHER,(WITH AUTO EMERGENCY STEERING) | 2 |
| ---- | ==================== | ||
| K | 707-99-44230 | SERVICE KIT,ARM CYLINDER | 1 |
| K | 707-99-44220 | SERVICE KIT | 1 |
| Spec Item | Data |
|---|---|
| Bore Diameter | 108mm |
| Piston Rod Diameter | 72mm |
| Working Stroke | 1160mm |
| Rated Working Pressure | 31.4MPa |
| Factory Test Pressure | 47.1MPa (1.5 times rated working pressure) |
| Barrel Material | High-tensile seamless alloy steel with precision inner honing |
| Piston Rod | 40CrMo heat-treated steel, 28~32μm hard chrome plating, HRC68–72, excellent wear resistance & anti-deformation performance |
| Matching Seal Kit PN | 203-63-02722K |
| Working Temperature | -25℃ ~ +85℃ |
| Structure Feature | Double ear lugs with quenched copper wear bushings, built-in internal buffer to reduce end-stroke impact and noise |
3. Product Advantages
4. Supplier Brief
Our factory has over 10 years of professional experience in R&D and production of hydraulic cylinders for Komatsu PC US series short-tail excavators, including PC128US-1. We supply complete boom, arm and bucket cylinder assemblies with mature production craft and full-process strict quality control. Our aftermarket hydraulic cylinders are exported worldwide all year round, winning consistent trust and positive feedback from global spare parts dealers.
5. FAQ
Q1: Can this arm cylinder fit Komatsu PC128US-2 or PC138US machines?
A: No. Each Komatsu zero-tail excavator model uses exclusive part numbers and unique structural dimensions without interchangeability. Please confirm your complete machine model before ordering.
Q2: Does the standard package include matching seal repair kit?
A: Seal kit is not included in standard delivery. You can purchase the dedied supporting seal kit separately, and we will offer a favorable combined order price.
Q3: How is the cylinder packed for long-distance sea transport?
A: Anti-rust oil filled into cylinder inner cavity, anti-rust grease evenly coated on piston rod surface. Wrapped with waterproof PE film and packed in reinforced export plywood cases to prevent collision, scratch and moisture damage during ocean transit.
Q4: Are there tiered volume discounts for full set cylinders (boom + arm + bucket)?
A: Yes. Complete working device cylinder set orders enjoy graded volume discounts. Consolidated container shipment service is available to reduce total logistics expenditure.
Q5: What after-sales service if oil leakage occurs within 12-month warranty?
A: Please provide clear photos of leakage position plus excavator serial number. We provide free seal replacement and professional remote troubleshooting guidance promptly.
Company Details
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...
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