| Parameter | Specification |
|---|---|
| COGENG Part Number | 128728A1 |
| OEM Equivalent | Case 128728A1 |
| Product Type | Hydraulic Cylinder Seal Kit |
| Application | Excavator / Loader hydraulic cylinders |
| Kit Type | Complete overhaul seal kit |
| Compatible Models | Multiple Case excavator and wheel loader models |
| Brand | Part Number |
|---|---|
| COGENG | 128728A1 |
| Case | 128728A1 |
| Interchange | 128728A2, 128728A3, 128729A1, 128730A1, 128731A1 |
| 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 |
Q: What Case models use the 128728A1 equivalent hydraulic cylinder seal kit?
A: The 128728A1 equivalent seal kit is designed for hydraulic cylinders on select Case excavator and loader models where this part number is specified. Common applications include boom, arm, or bucket cylinders. Seal kit compatibility can vary by cylinder serial number, machine configuration, 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 Case excavators and loaders?
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. Early seal replacement helps prevent internal cylinder scoring and more costly repairs.
Q: What is included in the COGENG 128728A1 equivalent seal kit?
A: Each complete seal kit includes piston seals, rod seals, wiper seals, O-rings, backup rings, and gland seals required 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.
Q: Is this seal kit suitable for professional hydraulic cylinder rebuilding?
A: Yes, the COGENG 128728A1 equivalent seal kit is manufactured using high-grade polyurethane, nitrile, and PTFE materials to precise OEM dimensional specifications. It is designed for professional cylinder rebuilding and provides dependable sealing performance when installed following standard hydraulic cylinder repair procedures by a qualified technician.
Q: What is the warranty coverage for this seal kit?
A: COGENG provides a standard 12-month warranty against manufacturing defects from the date of installation. Proof of purchase and installation by a qualified technician are required. Warranty does not cover seal failure caused by contaminated hydraulic fluid, improper installation, cylinder barrel or rod surface damage, or use on incompatible equipment.
Q: What should I inspect before installing the new seal kit?
A: Before installation, carefully inspect the cylinder rod for scratches, pitting, or chrome plating damage, and check the cylinder barrel for scoring or internal wear. Damaged surfaces will cause premature seal failure. Recondition or replace worn components and thoroughly flush the hydraulic system to remove all contaminants before reassembly.
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