ranroswang@hksparkling.com 
+86 138 2341 8469
4446258 Hydraulic Bucket Cylinder for Hitachi ZX70, ZX75US-3, ZX85US-3 Excavators
The 4446258 Bucket Cylinder Assembly is a premium-grade hydraulic actuator engineered specifically for Hitachi Zaxis-series compact and short-tail-swing excavators.
· Primary Models: Specifically designed for Hitachi ZX70 and ZX70-3 mini/midi excavators.
· Component Function: Controls the curl and dump movements of the excavator bucket under high-pressure working environments.
Thank you for choosing SPARKLING MACHINERY.
The 4446258 bucket cylinder is manufactured to meet or exceed original equipment tolerances for maximum reliability in high-production jobsites. Utilizing a precision-honed steel cylinder tube paired with an induction-hardened, hard-chrome-plated piston rod, this assembly offers exceptional resistance to bending and surface scoring. It provides the quick, aggressive digging and curling performance required for utilities, landscaping, and urban construction projects.
The SPARKLING MACHINERY NEW 4446258 Hydraulic Bucket Cylinder Photo:
Why choose the SPARKLING NEW 4446258 Bucket Cylinder?
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- Induction-Hardened Chrome Rod: Designed with a specialized micro-finished chrome plating layer to prevent surface pitting and scratch lines caused by flying stone or concrete dust.
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- Premium High-Pressure Sealing Matrix: Engineered with a heavy-duty polyurethane rod seal, buffer rings, and double-lip metal-clad wipers to retain continuous system pressures and lock out external mud or water.
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- End-of-Stroke Cushioning Valves: Incorporates internal hydraulic cushions to slow the piston down smoothly at full extension and retraction, shielding the bucket links and pins from violent mechanical impacts.
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- Direct Pin-to-Pin Integration: Machined to match the precise ear-hole bore specifications, grease manifold channels, and hydraulic port line positions of Hitachi part number 4446258.
FAQ
What are the primary signs that an excavator bucket cylinder like the 4446258 is failing?
Common symptoms include hydraulic fluid dripping down the barrel face from the gland nut, visible denting or chrome chipping along the silver piston rod, or an internal bypass issue (indicated by the bucket slowly opening or "drifting" on its own when holding a heavy load in mid-air).
Why is the bucket cylinder usually more susceptible to rod damage than the boom or arm cylinders?
The bucket cylinder operates closest to the actual work surface. It is continuously exposed to rocks falling backward over the bucket edge, striking concrete walls during tight structural demolitions, or being dragged through abrasive sand and mud layers, making a high-quality hardened rod and wiper seal essential.
Do I need to perform any special system flushing when installing this new cylinder?
If the old cylinder was replaced simply due to an external leak, a standard line swap is fine. However, if the old unit suffered a catastrophic internal piston head breakage or seal shredding, flushing the hydraulic lines and replacing the primary system filters is highly recommended. This prevents residual metal flakes or hard plastic fragments from traveling back through the main control valve and scoring the new cylinder walls.
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📦 Packing
1. Packaging methods: Carton box + Wooden case/Pallet + Anti-rust treatment
2. Export-standard packaging to ensure safety during transportation
3. Custom packaging available upon request
4. Dimensions and weight can be provided for freight calculation
🚚 Shipping
1. Available shipping methods: Sea freight, Air freight, Express delivery (DHL, UPS, FedEx, etc.)
2. LCL (Less than Container Load) and FCL (Full Container Load) options are supported
3. For Russian clients, we can introduce the forwarder agent to you
4. Delivery time: Ships within 1-3 working days after payment (for items in stock)
💳 Payment
1. Accepted methods: T/T, Bank Transfer, PayPal, Alipay, WeChat Pay, Western Union
2. Deposit + balance payment available for large or custom orders
3. Flexible payment options—feel free to contact us for details
📌 Frequently Asked Questions (FAQs)
Q: Which excavator models is this part compatible with?
A: This product is compatible with major brands such as CAT, KOMATSU, HITACHI, and more. Custom specifications are also available.
Q: How can I make sure I’m selecting the correct part?
A: You can send us a photo of the old part, part number, or your excavator model, and we will help you confirm the right match.
Q: Is there a warranty for this product?
A: Yes, we offer a 6-month quality guarantee under normal use.
Get a free quote
We are committed to producing the highest quality products at the most competitive prices. Therefore, we sincerely invite all interested companies to contact us for more information.
Contact us
Email: ranroswang@hksparkling.com
Wechat: +86 136 0901 0879
Skype: foreverlucia1
WhatsApp: +86 136 0901 0879
Address: No. 514-515, Hulin Road, Tianhe District, Guangzhou, China.
Sparkling Machinery Co.,Ltd
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Whatsapp: +8613609010879