| Parameter | Specification |
|---|---|
| COGENG Part Number | 991/00103 (99100103) |
| OEM Equivalent | JCB 991/00103, JCB 99100103 |
| Product Type | Hydraulic Cylinder Seal Kit |
| Application | Backhoe loader hydraulic cylinders |
| Kit Type | Complete overhaul seal kit |
| Compatible Models | JCB 3CX, 4CX, 5CX and related backhoe loader models |
| Brand | Part Number |
|---|---|
| COGENG | 991/00103, 99100103 |
| JCB | 991/00103, 99100103 |
| Interchange | 991/00104, 991/00105, 991/00145, 991/00147, 991/00012, 991/20021 |
| NO | Number | Name | Qty |
| 1 | 557/60005 | Ram lift | 2 |
| 2 | :557/70005 | Cylinder | 1 |
| 3 | **** | Pipe | 1 |
| 4 | ::557/90005 | Pipe | 1 |
| 5 | :809/00112 | Bearing liner 50mm pivot bore | 1 |
| 6 | :813/00413 | Seal 50mm internal dia. | 2 |
| 9 | :594/ 14020 | Kit-end cap 50mm rod x 90mm cyl | 1 |
| 10 | :2411/0506 | Seal 50mm rod | 1 |
| 11 | :2411/8606 | Seal wiper | 1 |
| 12 | :2302/0310 | O Ring | 1 |
| 13 | :590/40103 | Rod piston | 1 |
| 14 | :595/27300 | Head piston | 1 |
| 15 | :826/01179 | Dowel | 1 |
| 16 | :2411/7918 | Ring Wear | 1 |
| 17 | :2411/ 1135 | Seal piston | 1 |
| 18 | 991/00103 | Kit-seal | 1 |
Q: What JCB models use the 991/00103 hydraulic cylinder seal kit?
A: The 991/00103 is a hydraulic cylinder seal kit designed for specific JCB backhoe loader cylinders, commonly fitting boom, dipper, or stabilizer applications depending on machine configuration. Seal kit compatibility can vary by cylinder serial number and production year. Always verify this part number against your machine's parts manual or the cylinder's original seal kit reference before ordering.
Q: What are the symptoms of failing hydraulic cylinder seals on a JCB backhoe loader?
A: Common symptoms include visible hydraulic oil leaking from the cylinder rod or gland area, decreased lifting or digging force, cylinder drift where the implement slowly lowers under load, jerky or erratic cylinder movement, and external oil contamination around the cylinder assembly. Prompt seal replacement helps prevent internal cylinder scoring and more extensive repairs.
Q: What is included in the COGENG 991/00103 seal kit?
A: Each complete seal kit includes piston seals, rod seals, wiper seals, O-rings, backup rings, and gland seals needed for a full cylinder overhaul. COGENG kits are manufactured using materials that meet or exceed OEM specifications for abrasion resistance, temperature tolerance, and extended service life.
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