Highlight:
Komatsu O-Ring K9000176
, genuine O-Ring tractor parts
, aftermarket O-Ring seals DL250
1. Quick Details of seal K9000176:
| Part NO. |
K9000176 |
| Machine |
Excavator |
| Size |
5.7 mm thickness |
| Material |
NBR |
| Oil seal type |
O RING |
2. K9000176 parts on group :
| NO. |
PART NO. |
PRAT NAME |
QTY |
| 1 |
K9002961 |
HOUSING;BRAKE Komatsu China |
2 |
| 2 |
K9000032 |
PLUG Komatsu China |
2 |
| 3 |
K9000179 |
O-RING Komatsu China |
4 |
| 4 |
K9000334 |
GEAR;RING Komatsu China |
2 |
| 5 |
K9000176 |
O-RING Komatsu China |
4 |
| 6 |
K9000240 |
RING;MULTI SEAL Komatsu China |
2 |
| 7 |
K9000249 |
BEARING;TAPPER ROLLER Komatsu China |
2 |
| 8 |
K9000672 |
BEARING;TAPPER ROLLER Komatsu China |
2 |
| 9 |
K9002962 |
SHAFT;OUTPUT Komatsu China |
2 |
| 10 |
K9000674 |
NUT;SLOTTED Komatsu China |
2 |
| 11 |
K9000173 |
PIN;SLOT Komatsu China |
2 |
| 12 |
K9000286 |
COVER Komatsu China |
2 |
| 13 |
2.180-00284 |
O-RING Komatsu China |
2 |
| 14 |
K9000337 |
SHAFT;SUN GEAR Komatsu China |
2 |
| 15 |
K9000336 |
GEAR;PLANET Komatsu China |
6 |
| 16 |
K9000675 |
CARRIER;PLANET Komatsu China |
2 |
| 17 |
K9000277 |
BOLT;STOP Komatsu China |
2 |
| 18 |
K9000321 |
BEARING;TAPPER ROLLER Komatsu China |
6 |
| 19 |
K9000322 |
BEARING;TAPPER ROLLER Komatsu China |
6 |
| 20 |
K9000171 |
RING;RETAINING Komatsu China |
6 |
| 21 |
K9000164 |
RING;RETAINING Komatsu China |
2 |
| 22 |
1.180-00137 |
O-RING Komatsu China |
2 |
| 23 |
K9002864 |
BOLT;WHEEL Komatsu China |
24 |
3. K9000176 picture:
4. Service part number :
| PART NO. |
PART NO. |
Part NO. |
| 31Y1-15880 |
K9000170 |
R160LC-9-OR |
| 31Y1-15230 |
K9000171 |
R210LC-9-OR |
| 31Y1-29101 |
K9000172 |
R290LC-7A-OR |
| 31Y1-28960 |
K9000173 |
R320LC-7-OR |
| 31Y1-28790 |
K9000174 |
HX140L-OR |
| 31Y1-35450 |
K9000175 |
HX220L-OR |
| 31Y1-30290 |
K9000177 |
HX300L-OR |
| 31Y1-34060 |
K9000178 |
R60-7-OR |
| 31Y1-34070 |
K9000179 |
R80-7-OR |
| 31Y1-24310 |
K9000180 |
R110-7-OR |
5. FAQ
Q: Why choose NBR as the standard material for this O-ring set, and what are the alternatives for special conditions?
A: NBR is selected as the base material because it delivers excellent resistance to mineral hydraulic oils, greases, and fuels, with good elasticity and abrasion resistance for general construction environments. It operates reliably from -30°C to +100°C, which covers most standard excavator working conditions. For high-temperature scenarios (up to +150°C) or exposure to corrosive fluids, we offer FKM (Viton) O-rings in the same sizes. For cold regions (-40°C to +120°C), HNBR provides better low-temperature flexibility and ozone resistance.
Q: Can you describe the color, hardness, and surface finish of the O-rings in this kit?
A: The standard NBR O-rings are solid black with a smooth, non-porous surface and a 70 Shore A hardness—firm enough to resist extrusion yet flexible for easy installation. The optional FKM O-rings are brown with a semi-gloss finish and 75 Shore A hardness for enhanced heat resistance. HNBR O-rings are green with a matte surface and 70 Shore A hardness, balancing cold flexibility and durability. All O-rings have precision-cut, burr-free edges and consistent cross-sections to ensure uniform compression and leak-tight sealing.
Q: What are the key performance specs like pressure rating, temperature range, and shelf life?
A: This O-ring set is built for heavy-duty hydraulic systems. Max working pressure: Up to 350 bar (with backup rings) or 150 bar (without backup rings). Standard temp range (NBR): -30°C to +100°C; FKM: -20°C to +150°C; HNBR: -40°C to +120°C. Shelf life: 5 years when stored properly (cool, dark, dry environment). Under normal operating conditions, NBR O-rings last 5000–7000 hours, while FKM versions extend to 10,000–12,000 hours.
Q: What common issues do cheap O-ring kits have, and how does K9000176 avoid them?
A: Low-quality O-rings often use recycled rubber or poor curing, leading to swelling in hydraulic oil, cracking under pressure, or brittleness over time. They may also have inconsistent dimensions (out-of-round, uneven cross-section) that cause leaks or installation difficulties. In contrast, K9000176 uses 100% virgin rubber compounds with strict quality control: each batch is tested for hardness, dimensional accuracy, and oil resistance. The result is no swelling, no cracking, and consistent sealing performance even after long-term use.
Q: What installation tips and precautions should users follow?
A: Proper installation ensures maximum lifespan. First, clean all grooves and sealing surfaces with fresh hydraulic oil—remove all dirt, metal shavings, or old seal residue; even tiny particles can damage the O-ring. Second, lubricate the O-ring and groove with clean hydraulic oil; never use grease or petroleum-based products, as they cause rubber swelling. Third, avoid over-stretching the O-ring during installation—excessive stretch reduces cross-section and causes leaks. Fourth, check for sharp edges on the housing; deburr or polish rough spots to prevent cutting the O-ring. Finally, avoid twisting the O-ring in the groove; ensure it sits flat and evenly before assembly.
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