| Parameter | Specification |
|---|---|
| COGENG Part Number | 991/20024 (991-20024 / 99120024) |
| OEM Equivalent | JCB 991/20024, JCB 991-20024, JCB 99120024 |
| Product Type | Hydraulic Cylinder Seal Kit |
| Application | Boom, Bucket, Arm, Stabilizer, Steering cylinders |
| Kit Type | Complete overhaul seal kit |
| Compatible Models | Multiple JCB excavator, backhoe loader, and telehandler models |
| Brand | Part Number |
|---|---|
| COGENG | 991/20024, 991-20024, 99120024 |
| JCB | 991/20024, 991-20024, 99120024 |
| Interchange | 991/20025, 991/20026, 991/00145, 991/00147, 991/10142 |
| Component | Material Grade | Hardness | Temperature Range |
|---|---|---|---|
| Piston Seals | Polyurethane (PU) | 90-92 Shore A | -35°C to +110°C |
| Rod Seals | NBR + PTFE coating | 85 Shore A | -40°C to +120°C |
| Wiper Seals | Polyurethane (PU) | 88-90 Shore A | -35°C to +100°C |
| O-Rings | HNBR (Zetpol) | 70 Shore A | -40°C to +150°C |
| Wear Rings | PTFE + Bronze filler | — | -50°C to +200°C |
| Backup Rings | Nylon 66 (Glass filled) | — | -40°C to +120°C |
| Buffer Seals | Polyurethane | 90 Shore A | -35°C to +110°C |
| NO | Number | Name | Qty |
| 1 | :332/G4335 | Kit service end cap | 1 |
| 2 | :590/40066 | Rod piston, 30mm | 1 |
| 2A | ::809/00104 | Bush grooved, 40mm long | 1 |
| 3 | :595/ 10032 | Piston head | 1 |
| 4 | :826/01182 | Dowel | 1 |
| 7 | :553/70202 | Cylinder 60mm bore | 1 |
| 7A | ::809/00104 | Bush grooved, 40mm long | 1 |
| 9 | :1450/0001 | Nipple Grease, Straight 1/8 BSP | 2 |
| 50 | :991/20024 | Kit Seals | 0 |
Q: What JCB models use the 991/20024 hydraulic cylinder seal kit?
A: The 991/20024 (also referenced as 991-20024 or 99120024) is a hydraulic cylinder seal kit designed for specific JCB backhoe loader and excavator cylinders, commonly used in boom, dipper, or stabilizer applications. Seal kit fitment 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?
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. Addressing these signs promptly helps prevent more serious internal cylinder damage.
Q: What is included in the COGENG 991/20024 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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