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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.
172157-99420 is an aftermarket bucket cylinder seal kit matched 1:1 to the original Yanmar repair-kit reference. Verified Yanmar B50-2 and VIO50-1 parts catalogues place this kit in the bucket cylinder assembly, not the arm/dipper cylinder. The associated bucket-cylinder application uses a 50 mm rod and 75 mm bore reference. For distributors, this distinction matters: some retail listings incorrectly label this number as an arm kit, creating avoidable catalogue and return issues. List 172157-99420 under bucket cylinder seal kits and use the original number for direct matching, quotation, and multi-SKU sourcing support.
| Part Number: |
172157-99420 |
| Fits Models: |
VIO50, B50-2 |
| Brand: | Yanmar replacement |
| Type: |
Bucket Cylinder Seal Kit / Hydraulic Cylinder Seal Kit |
| Application: |
|
| Size: | Standard Size |
1. Is 172157-99420 a bucket or arm cylinder seal kit?
It is a bucket cylinder seal kit. Verified Yanmar parts catalogues list 172157-99420 as “CYLINDER KIT, BUCKET,” not as an arm/dipper cylinder kit.
2. Can I order this kit using only OEM part number 172157-99420?
Yes. Submit the original kit number for direct matching to the corresponding Ruijueparts aftermarket replacement seal kit and quotation.
3. What cylinder size is associated with 172157-99420?
The verified bucket-cylinder reference uses a 50 mm rod and 75 mm bore. This is useful for internal catalogue control and distinguishing it from other Yanmar cylinder kits.
4. Why do some websites describe this as an arm cylinder kit?
Some market listings contain conflicting application data. The Yanmar parts diagrams identify 172157-99420 as a bucket-cylinder kit, so this is the correct classification for product listing and B2B sourcing.
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.
