Availability: 2000 in stock
Couldn't load pickup availability
Volume discounts available · Minimum order quantities apply for bulk pricing
Shipping:
- Standard models take 1-3 business days.
- Bulk orders take 3-7 business days.
- For urgent orders, please contact our sales team. [Email: info@ruijueparts.com]
Returns: We accept returns within 30 days of purchase. Learn more—return policy
PP bag, carton
China
L/C, T/T, Western Union, MoneyGram
Oil Sealing
We specialize in aftermarket seal kits compatible with brands such as Caterpillar, Komatsu, JCB, and John Deere. We offer B2B bulk order consultation and large-scale procurement services. With years of industry experience, we provide wholesale and long-term bulk supply services to our global business partners. Submit your bulk order details, and our professional B2B team will provide you with competitive pricing, fast delivery times, and customized supply solutions within 24 hours.
258-0500 is an aftermarket replacement stick cylinder seal kit for selected Caterpillar wheeled excavators and material-handling machines. The reference kit is designed for a 120 mm cylinder-bore assembly and includes matched sealing, guiding and backup components for resealing the applicable cylinder group. Compatibility is configuration-specific: one machine may use different boom, stick and bucket cylinders with different kits. For accurate distributor purchasing or workshop repair, match 258-0500 to the original part number. Do not select this kit solely because the equipment is an M316, M318, M322, M324 or M325 series machine.
Part Number: 258-0500
Fits Models: M316C, M316D, M318F, M318F OEM, M322C, M322D, M322D MH, M324D2 MH, M325C MH
Brand: Caterpillar replacement
Type: Hydraulic Cylinder Seal Kit / Stick Cylinder Seal Kit
Application:
System: Hydraulic stick/arm cylinder
Function: Reseals the applicable stick cylinder to support controlled arm movement and reduce hydraulic oil leakage.
Wheeled Excavators: M316C, M316D, M318F, M318F OEM, M322C, M322D, M322D MH, M324D2 MH, M325C MH
Excavator / Material Handler: M325D MH
Mobile Hydraulic Power Unit: M316D
Size: Standard Size
Is 258-0500 a swivel or swing seal kit?
No. Reference cylinder-group information identifies 258-0500 as a stick cylinder seal kit. It should not be listed as a swivel seal kit.
Does 258-0500 fit every cylinder on an M316, M322 or M325 machine?
No. A single machine can use different seal kits for its boom, stick and bucket cylinders. Match the original kit number or cylinder group before purchasing.
What is the reference bore size for this seal kit?
The associated cylinder group uses a 120 mm bore. This detail helps workshop teams verify the repair application, but the original part number is the primary matching reference.
Can distributors quote 258-0500 using only the part number?
Yes. Send the required quantity and original 258-0500 reference for quotation. Ruijueparts can also support multi-SKU enquiries, neutral packaging and selected older-equipment requirements.
Our aftermarket seal kits deliver a practical, cost-effective solution without compromising on real-world performance. We offer a lower upfront cost and reliable sealing for your daily maintenance and repair needs.
We stock seal kits across CAT, Komatsu, Volvo, JCB, Hitachi, Doosan, John Deere, Kubota, and 10+ other brands—one supplier for your whole fleet.
Ship under RuijueParts branding, neutral (unbranded) packaging, or your own private label. Suitable for resellers and distributors.
When genuine OEM seals are out of production for your old machinery, we can custom-make oil seals using your dimensions or our engineer-recommended specifications.
Ship under RuijueParts branding, neutral (unbranded) packaging, or your own private label. Suitable for resellers and distributors.
Volume pricing for repair shops, dealers, and fleet operators. Get a quote via our website or WhatsApp: +86 13692100161.
OEM seal kits are the right choice when machinery is under active warranty, operating at peak duty cycles, or when failure risk is unacceptably high. Budget aftermarket—like Ruijue Parts—makes sense in these common scenarios:
When a machine is aging out of your fleet, OEM parts cost more than the job warrants. A budget kit extends service life without over-investing.
For machines used infrequently or on lower-intensity tasks, premium OEM pricing may not be justified.
When OEM stock is out or delivery takes weeks, an available aftermarket kit gets your machine running now.
Repair shops and fleet managers running high volumes of machines often balance OEM and aftermarket across their portfolio based on criticality.
Fully retract the cylinder and relieve system pressure before disassembly. Never work on a pressurized circuit.
Remove from the machine. Unthread the gland nut and withdraw the piston rod carefully to avoid surface damage.
Clean the bore, rod, and all metal parts with a lint-free cloth. Contamination introduced during reassembly accelerates seal wear—this step is especially important for budget-grade seals.
Check for scoring or pitting. Budget seals are more sensitive to surface imperfections—address rod damage before fitting new seals.
Lightly coat each seal with clean hydraulic fluid before installation. Use proper seal drivers — not screwdrivers or sharp tools — to avoid nicking the sealing lip.
Torque the gland nut to spec and cycle the hydraulic system under no-load conditions. Inspect for leaks before returning the machine to service.
Budget-grade seals may have shorter service intervals than OEM. Inspect rod seals for moisture, oil film, or weeping more frequently and replace proactively.
Contaminated fluid degrades seals faster — this applies especially to non-OEM materials. Replace fluid and filters on schedule.
When storing equipment with cylinders extended, protect rod surfaces from corrosion and debris to preserve wiper seal life.
Avoid using sharp tools during assembly to prevent nicks or scores on the seal lips. Pre-lubricating all components with clean hydraulic oil is recommended to ensure a smooth fit into the cylinder grooves.
Click "Add to Cart" for immediate dispatch, or contact our team for bulk pricing and wholesale support.
First order was a pleasant surprise-
great value for money.
Good! The 101529-00005 seal kit
performed exceptionally. No oil leaks,smooth operation.
Fast delivery and exactly as described.Highly recommend!
Seals fit well and arrived on time.
Good quality for the price.
