| Specification | COGENG 550/42835 |
|---|---|
| OEM Equivalent | JCB 550/42835 |
| Application | Bucket / Dipper cylinder for JCB 3CX and 4CX |
| Typical Bore | 70mm–75mm (verify) |
| Typical Rod | 40mm–45mm (verify) |
| Material | Polyurethane + NBR (Viton optional) |
| Included | All seals, O-rings, back-up rings, wear rings |
| Warranty | 1 year typical |
| Installation | Requires basic hydraulic cylinder rebuilding skills |
| Component | Torque Range |
|---|---|
| Piston Nut | 150–250 Nm (110–185 ft-lbs) |
| Cylinder Head / Gland | 100–200 Nm (75–150 ft-lbs) |
| Hydraulic Hose Fittings | 30–50 Nm (22–37 ft-lbs) |
⚠️ Important: These are estimates. Always consult the JCB service manual for your specific machine serial number.
| Verification Method | Steps |
|---|---|
| Check cylinder part number | Look for JCB part number tag on the cylinder |
| Measure bore diameter | Remove cylinder, measure inside diameter of the barrel |
| Measure rod diameter | Measure piston rod outside diameter |
| Provide serial number | Give JCB machine serial number to supplier |
| Compare old seals | Remove old seals and measure dimensions |
| JCB Series | Bore (mm) | Rod (mm) |
|---|---|---|
| 3CX early (1990s) | 70mm | 40mm |
| 3CX late (2000s) | 75mm | 45mm |
| 4CX | 80mm | 50mm |
📌 COGENG 550/42835 typically fits 70mm–75mm bore. Confirm before ordering.
| Brand | Part Number | Notes |
|---|---|---|
| JCB | 550/42835 | OEM original – COGENG uses the same number |
| JCB | 550/42836 | May be a superseded or related variant (check compatibility) |
✅ Direct Fit Confirmation: COGENG 550/42835 is manufactured as a direct replacement for JCB 550/42835. All seals are dimensionally identical to OEM specifications.
| NO | Number | Name | Qty |
| A | 40/303543 | Ram Shovel, Assembly | 1 |
| 1 | 550/42831 | Tube Ram Bucket | 1 |
| 2 | 550/42391 | Piston rod S/A | 1 |
| 3 | 550/42392 | Piston | 1 |
| 4 | 550/42832 | Head End Cover | 1 |
| 5 | 550/40875 | Nut Piston rod | 1 |
| 6 | 550/41135 | Nipple Grease | 1 |
| 7 | 550/40895 | Grease Nipple | 1 |
| 8 | 550/42835 | Seal Kit | 1 |
Q1: Which JCB backhoe loader models use the 550/42835 bucket cylinder seal kit?
A: This premium seal kit is designed for the bucket cylinder on JCB 3CX and 4CX backhoe loaders requiring OEM part number 550/42835. Please verify compatibility with your machine serial number before ordering.
Q2: Is this an OEM or aftermarket seal kit?
A: It is a premium OEM-grade replacement seal kit, manufactured to meet or exceed original JCB quality standards for sealing performance, durability, and precise fit.
Q3: What is included in the COGENG 550/42835 bucket cylinder seal kit?
A: The kit includes all necessary rod seals, piston seals, wipers, O-rings, and backup rings for a complete bucket cylinder rebuild – no missing components.
Q4: What symptoms indicate I need to replace my bucket cylinder seals on a 3CX/4CX?
A: Common signs include hydraulic oil leaks from the bucket cylinder, weak digging or curling power, bucket drift, slow cylinder operation, and visible seal damage or wear.
Q5: Is this seal kit plug-and-play for my JCB backhoe?
A: Yes, it is designed for direct replacement with OEM-spec seals – proper installation requires standard cylinder rebuild procedures and basic hand tools.
Q6: How do I purchase the COGENG 550/42835 bucket cylinder seal kit?
A: Contact us with your JCB 3CX or 4CX machine serial number for fitment verification, then order directly through our website or sales team for fast factory-direct shipping.
Contact COGENG
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