| Parameter | Specification |
|---|---|
| COGENG Part Number | 4364913 |
| OEM Equivalent | Hitachi 4364913 |
| Product Type | Hydraulic Cylinder Seal Kit |
| Application | Arm (Dipper) Cylinder |
| Kit Type | Complete overhaul seal kit |
| Compatible Models | Multiple Hitachi excavator models |
| Brand | Part Number |
|---|---|
| COGENG | 4364913 |
| Hitachi | 4364913 |
| John Deere | 4364913 (Interchange) |
| Interchange | 4364914, 4364915, 4649049, 4649050 |
| Parameter | Specification |
|---|---|
| Cylinder Type | Arm (Dipper) Cylinder |
| Bore Diameter | OEM specific (90-110 mm typical) |
| Rod Diameter | OEM specific (55-70 mm typical) |
| Working Pressure | 320-350 bar (4,640-5,075 psi) |
| Seal Type | OEM-grade polyurethane / HNBR / PTFE |
| 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 |
| Parameter | Rating |
|---|---|
| Maximum Pressure | 350 bar (5,075 psi) |
| Operating Temperature | -40°C to +120°C |
| Fluid Compatibility | Mineral oil, synthetic hydraulic fluids |
| Seal Speed Rating | Up to 0.5 m/s |
| Service Life | 5,000+ operating hours |
| Cylinder | Function | Location | Typical Cycle Frequency |
|---|---|---|---|
| Arm Cylinder | Controls dipper arm extension/retraction | Between boom and arm | High cycle operation |
| Item | Description | Quantity | Material |
|---|---|---|---|
| 1 | Piston Seal (Primary) | 2 | Polyurethane |
| 2 | Rod Seal (Step-cut) | 2 | NBR + PTFE |
| 3 | Wiper Seal (Double-lipped) | 2 | Polyurethane |
| 4 | Buffer Seal | 2 | Polyurethane |
| 5 | Wear Ring (Piston) | 2 | PTFE Composite |
| 6 | Wear Ring (Gland) | 2 | PTFE Composite |
| 7 | O-Ring (Gland to barrel) | 2 | HNBR |
| 8 | O-Ring (Piston to rod) | 2 | HNBR |
| 9 | O-Ring (End cap) | 4 | HNBR |
| 10 | Backup Ring (Various sizes) | 4 | Nylon 66 |
| 11 | Dust Seal (Rod wiper) | 2 | Polyurethane |
| Model | Series | Application | Compatibility |
|---|---|---|---|
| ZX130-5A | -5A Series | Arm cylinder | ✓ Compatible |
| ZX130-6 | -6 Series | Arm cylinder | ✓ Compatible |
| ZX160-5A | -5A Series | Arm cylinder | ✓ Compatible |
| ZX160-6 | -6 Series | Arm cylinder | ✓ Compatible |
| ZX210-3 | -3 Series | Arm cylinder | ✓ Compatible |
| ZX210-5A | -5A Series | Arm cylinder | ✓ Compatible |
| ZX210-6 | -6 Series | Arm cylinder | ✓ Compatible |
| ZX240-3 | -3 Series | Arm cylinder | ✓ Compatible |
| ZX240-5A | -5A Series | Arm cylinder | ✓ Compatible |
| ZX240-6 | -6 Series | Arm cylinder | ✓ Compatible |
| ZX250-3 | -3 Series | Arm cylinder | ✓ Compatible |
| ZX250-5A | -5A Series | Arm cylinder | ✓ Compatible |
| ZX250-6 | -6 Series | Arm cylinder | ✓ Compatible |
| ZX270-3 | -3 Series | Arm cylinder | ✓ Compatible |
| ZX270-5A | -5A Series | Arm cylinder | ✓ Compatible |
| ZX270-6 | -6 Series | Arm cylinder | ✓ Compatible |
| ZX350-3 | -3 Series | Arm cylinder | ✓ Compatible |
| ZX350-5A | -5A Series | Arm cylinder | ✓ Compatible |
| ZX350-6 | -6 Series | Arm cylinder | ✓ Compatible |
| ZX470-3 | -3 Series | Arm cylinder | ✓ Compatible |
| ZX470-5A | -5A Series | Arm cylinder | ✓ Compatible |
| ZX470-6 | -6 Series | Arm cylinder | ✓ Compatible |
| Model | Series | Application |
|---|---|---|
| 135D | D-Series | Arm cylinder |
| 160D | D-Series | Arm cylinder |
| 200D | D-Series | Arm cylinder |
| 210D | D-Series | Arm cylinder |
| 240D | D-Series | Arm cylinder |
| 270D | D-Series | Arm cylinder |
| 300D | D-Series | Arm cylinder |
| 350D | D-Series | Arm cylinder |
| 135G | G-Series | Arm cylinder |
| 160G | G-Series | Arm cylinder |
| 200G | G-Series | Arm cylinder |
| 210G | G-Series | Arm cylinder |
| 240G | G-Series | Arm cylinder |
| 270G | G-Series | Arm cylinder |
| 300G | G-Series | Arm cylinder |
| 350G | G-Series | Arm cylinder |
Decompose picturesNote: This seal kit is designed for Hitachi arm cylinders. Verify cylinder dimensions with your equipment manual before ordering. Contact COGENG with your machine serial number for exact compatibility confirmation.
| NO | Number | Name | Qty |
| - | 667001 | . TUBE; CYLINDER ASSEMBLY | 1 |
| 1A | 667002 | .. TUBE; CYLINDER | 1 |
| 1B | 4352400 | .. BUSHING; PIN | 2 |
| 2 | 667003 | . ROD; PISTON ASSEMBLY | 1 |
| 2A | 667004 | .. ROD; PISTON | 1 |
| 2B | 4352400 | .. BUSHING; PIN | 2 |
| - | 667005 | . HEAD; CYLINDER | 1 |
| - | 309304 | . BUSHING | 1 |
| 5 | 208604 | . RING; RETAINING | 1 |
| - | 409004 | . RING | 1 |
| - | 208605 | . PACKING; U-RING | 1 |
| - | 208606 | . RING; BACK-UP | 1 |
| - | 667006 | . RING; WIPER | 1 |
| 10 | A811105 | . O-RING | 1 |
| 11 | 298904 | . RING; BACK-UP | 1 |
| 12 | 408805 | . BOLT; SOCKET | 12 |
| 13 | 409005 | . BEARING; CUSHION | 1 |
| 14 | 667007 | . SEAL; CUSHION | 1 |
| 15 | 409007 | . PISTON | 1 |
| - | 240915 | . RING; SEAL ASSEMBLY | 1 |
| 17 | 409008 | . RING; BACK-UP | 2 |
| 18 | 667008 | . RING; SLIDE | 2 |
| 19 | 298907 | . RING; SLIDE | 2 |
| 20 | 409010 | . SHIM | 1 |
| 21 | 667009 | . NUT | 1 |
| 22 | 309011 | . SCREW; SET | 1 |
| 23 | 111707 | . BALL; STEEL | 1 |
| 24 | 409012 | . BEARING; CUSHION | 1 |
| 25 | 667010 | . SEAL; CUSHION | 1 |
| 26 | 409014 | . STOPPER | 2 |
| 27 | 409015 | . RING; RETAINING | 1 |
| 29 | 408810 | . RING; WIPER | 2 |
| 30 | 409016 | . JOINT | 1 |
| 31 | 667011 | . PIPE | 1 |
| 32 | 4506430 | . O-RING | 2 |
| 33 | 309019 | . BOLT; SOCKET | 8 |
| 34 | 667012 | . BAND | 1 |
| 35 | 327410 | . BAND | 1 |
| 36 | 408815 | . BOLT | 2 |
| 37 | 325913 | . WASHER | 2 |
| 38 | 309021 | . HOLDER | 1 |
| 39 | 667013 | . CLAMP; PIPE | 1 |
| - | 208516 | . WASHER; SPRING | 2 |
| 40 | 0208516 | . WASHER; SPRING |
1 |
| 41 | J75481 | . FITTING; | 1 |
| GREASE | 1 | ||
| 100 | 4364913 | KIT; SEAL | 1 |
| 200 | 0667014 | KIT; BAND | 1 |
Q: What Hitachi models use the 4364913 arm cylinder seal kit?
A: The COGENG 4364913 is a premium replacement seal kit designed for the arm cylinder on select Hitachi excavator models where this part number is specified. Applications may span multiple models and series. Always verify this part number against your machine's parts manual or the cylinder's original seal kit reference to confirm exact compatibility, as cylinder specifications can vary by serial number range and production year.
Q: What are the symptoms of failing arm cylinder seals on a Hitachi excavator?
A: Common symptoms include visible hydraulic oil leaking from the arm cylinder rod or gland area, reduced arm digging and lifting force, cylinder drift where the arm slowly drops under load, jerky or uneven arm movement, and external oil accumulation around the cylinder assembly. Early seal replacement helps prevent internal cylinder scoring and more costly repairs.
Q: What is included in the COGENG 4364913 premium 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 arm cylinder overhaul. COGENG premium kits are manufactured using high-grade materials that meet or exceed OEM specifications for abrasion resistance, temperature tolerance, and extended service life in demanding excavator applications.
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