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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.
991/00012 is an aftermarket hydraulic cylinder seal kit referenced for selected JCB backhoe loader and telehandler cylinders. Its 60 mm rod × 100 mm bore reference size can occur in more than one cylinder position, including specified boom/stick, swing and heavy-duty stabilizer applications. This makes cylinder position and serial range important: it is not a universal kit for every hydraulic cylinder on a 3CX or 4C machine. Published applications commonly apply to machines built before serial M319999, while a separate 530B-4HL stabilizer application begins at M580810. For B2B purchasing, use 991/00012 as the primary quote reference and record the machine/cylinder position when managing mixed repair orders. Ruijueparts supports part-number matching and consolidated RFQs.
| Part Number: |
991/00012 |
| Fits Models: |
3CX, 3D,4CN,4C Turbo,214,530B-4HL Telehandler |
| Brand: | JCB replacement |
| Type: |
Hydraulic Cylinder Seal Kit |
| Application: |
|
| Size: | Standard Size |
What is the reference size for 991/00012?
The published cylinder reference is a 60 mm rod × 100 mm bore. Treat this as a supporting identification check; use the original 991/00012 number as the main purchasing reference.
Is 991/00012 only a boom cylinder seal kit?
No. It is listed for several specified cylinder functions, including selected boom/stick, swing and heavy-duty stabilizer applications. Do not assign it to a cylinder solely by machine model.
Does 991/00012 fit every JCB 3CX?
No. The listed 3CX applications are cylinder-specific and commonly limited to machines before serial M319999. Verify both the cylinder location and serial range.
Can the same kit apply to a backhoe loader and a telehandler?
Yes, this reference is also listed for a specified stabilizer application on the JCB 530B-4HL. The original part number remains the preferred basis for direct quotation.
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.
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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.
