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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.
8T-1374 is an aftermarket hydraulic cylinder seal kit for selected older Caterpillar equipment using a 2.50 in rod and 5.50 in bore reference. It is a dimensional and cylinder-group kit, not a kit dedicated to only one machine function. Published catalogues reference it for ripper cylinders on D4D, D4E, and D6C machines; lift cylinders on 955K and 955L crawler loaders; steering cylinders on 992 and 992B wheel loaders; and load or cushion-hitch cylinders on selected 621, 623, and 627 scrapers. Confirm the original 8T-1374 number or cylinder group before ordering.
Part Number: 8T-1374
Fits Models: D4D, D4E, D6C; cylinder 6J3308
Brand: Caterpillar replacement
Type: Hydraulic Cylinder Seal Kit
Application:
System: Hydraulic cylinder
Reference Dimensions: 2.50 in rod × 5.50 in bore
Published Functions: Ripper, lift, tilt, steering, load, and cushion-hitch cylinder applications
Crawler Dozers – Ripper: D4D, D4E, D6C; cylinder 6J3308
Crawler Dozer – RH Tilt: D6D; cylinder 7J9695
Crawler Loaders – Ripper: 941, 941B, 951, 955H; cylinder 6J3308
Crawler Loaders – Ripper: 955, 955K; cylinder 5J8190
Crawler Loaders – Tilt: 951B, 951C
Crawler Loaders – Lift: 955K, 955L; cylinder 5J6342
Wheel Loaders – Lift / Tilt: 950; cylinder references 7J9690, 7J9695, 7J9696
Wheel Loaders – Steering: 992, 992B; cylinder references 7J9800, 8J6339, 9K5707
Wheel Scrapers – Load / Cushion Hitch: 621, 623, 627; cylinder 8J0204
Wheel Scrapers – Load: 621B, 623B, 627B; cylinder 8J9446
Wheel Scrapers – Load: 621E, 623E, 627E; cylinder 9T1803
Size: Standard Size
Q: Is 8T-1374 only a ripper cylinder seal kit?
A: No. Ripper is one published application, but 8T-1374 is also referenced for selected lift, tilt, steering, load, and cushion-hitch cylinders. It should be presented as a general hydraulic cylinder seal kit.
Q: What cylinder dimensions are associated with 8T-1374?
A: Published seal catalogues identify a 2.50 in rod and 5.50 in bore reference. Check these dimensions together with the original part number or cylinder group.
Q: Is 8T-1374 automatically interchangeable with 9X-2050?
A: Some aftermarket catalogues show both references in similar cylinder applications, but they should not be treated as universally interchangeable without confirming the machine serial range and cylinder group.
Q: Can I request a quote with only 8T-1374?
A: Yes. Send the original 8T-1374 number and quantity for direct replacement matching. This is more reliable than identifying the product only by machine model or cylinder function.
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.
