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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.
5004401M91 is an aftermarket dipper cylinder seal kit for selected Terex/Fermec backhoe loaders. The dipper cylinder extends and retracts the rear excavating arm, so this kit is not interchangeable with the boom, bucket, swing or extendable-dipper kit. Service catalogues associate the reference with Pacoma cylinder 5000124M91 and a 65 mm rod × 100 mm bore; other published applications also list cylinder 5003982M91. Match the original kit number and cylinder number together when ordering, because machine-series fitment varies by configuration.
Part Number: 5004401M91
Fits Models: 760, 820, 840, 860, 960, 970
Brand: TEREX replacement
Type: Hydraulic Cylinder Seal Kit / Dipper Cylinder Seal Kit
Application:
Equipment: Terex and Fermec backhoe loaders
Cylinder position: Rear backhoe dipper cylinder
Function: Rebuilds the hydraulic cylinder that extends and retracts the dipper arm during digging and loading cycles.
Backhoe Loaders: 760, 820, 840, 860, 960, 970
Size: Standard Size
Q1: What does the 5004401M91 seal kit repair?
A: It is referenced for the rear backhoe dipper cylinder. This cylinder controls the in-and-out movement of the dipper arm during excavation.
Q2: Is 5004401M91 the same as the 5004400M91 kit?
A: No. 5004400M91 is associated with the backhoe boom cylinder, while 5004401M91 is for the dipper cylinder. They serve different cylinder positions and are not interchangeable.
Q3: Is a dipper cylinder the same as an extendable-dipper cylinder?
A: No. The standard dipper cylinder moves the main excavating arm. An extendable-dipper cylinder controls the telescopic extension section and normally requires a different repair kit.
Q4: Can I request a quote using only 5004401M91?
A: Yes. Ruijueparts can match the aftermarket replacement kit directly from the original reference. Where the original number is unavailable, send the cylinder number or clear seal kit photo for checking.
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.
