The COGENG 141-63-05050 Komatsu Undercarriage & Hydraulic Seal Kit is a comprehensive, high-quality OEM-compatible seal kit designed for Komatsu excavators and heavy equipment. This complete rebuild kit includes all necessary seals, O-rings, gaskets, and wear components for both undercarriage and hydraulic system maintenance and repair.
This seal kit is engineered to address two critical areas of excavator maintenance:
Track Adjuster Seals – Maintain proper track tension
Track Roller Seals – Prevent grease/oil leakage from rollers
Carrier Roller Seals – Keep carrier rollers lubricated
Idler Seals – Seal the idler wheel assembly
Track Motor Seals – Prevent hydraulic oil leakage from track motors
Final Drive Seals – Seal the final drive gearbox
Cylinder Seal Kits – For boom, arm, bucket cylinders
Pump Seal Kits – For hydraulic pumps
Control Valve Seal Kits – For main control valves
Swing Motor Seal Kits – For swing motor assemblies
O-Ring Kits – Assorted sizes for various connections
Backup Rings – For high-pressure applications
Wiper Seals – For hydraulic cylinders
Manufactured under ISO9001 certified processes, the COGENG 141-63-05050 seal kit uses high-grade materials:
Nitrile Rubber (NBR): Excellent oil and fuel resistance
Polyurethane (PU): Superior wear resistance for dynamic seals
PTFE (Teflon): Low friction for piston seals
Steel Reinforcements: For high-pressure applications
Why Choose COGENG 141-63-05050?
Complete Rebuild Solution: One kit covers multiple undercarriage and hydraulic components.
OEM Compatibility: Direct replacement for Komatsu 141-63-05050.
Premium Materials: NBR, PU, PTFE for long service life.
Cost-Effective: Significantly cheaper than buying individual OEM seals.
In Stock: Ready for immediate shipment.
| Parameter | Specification |
|---|---|
| COGENG Part Number | 141-63-05050 |
| OEM Reference | Komatsu 141-63-05050 |
| Roller Type | Track roller / Track carrier roller |
| Roller Diameter | 150mm (5.91 inches) |
| Overall Width | 110mm (4.33 inches) |
| Shaft Diameter | 45mm (1.77 inches) |
| Bearing Type | Tapered roller bearings (2 pcs) |
| Seal Type | Floating ring seals (metal face) |
| Material | High-carbon steel (through-hardened) |
| Surface Hardness | 52-58 HRC |
| Case Depth | 8-12mm (hardened layer) |
| Core Hardness | 28-35 HRC |
| Lubrication | Oil bath (EP90 gear oil, 80-120ml) |
| Weight | 12.8 kg ±5% (28.2 lbs) |
| Load Capacity | Up to 8,500 kg per roller |
| Service Life | 3,000-5,000 hours (typical) |
| Component | COGENG Specification | Material | Special Features |
|---|---|---|---|
| Roller Body | Precision forged/cast | High-carbon steel | Through-hardened, wear-resistant |
| Shaft / Axle | Induction hardened | Alloy steel | Precision ground surface |
| Tapered Bearings | Premium grade (Class 3) | Chrome steel (52100) | Factory pre-set clearance |
| Floating Ring Seals | Metal face design | Cast iron + steel | Self-lubricating |
| Mounting Bolts | M12 x 1.75 (4 pcs) | Grade 10.9 steel | Corrosion-resistant coating |
| O-Ring Set | NBR/FKM composite | Rubber compound | Temp: -40°C to +120°C |
| Grease Fitting | Standard 1/8" NPT | Steel | Replaceable design |
| Model | Series | Application Position | Compatibility |
|---|---|---|---|
| PC120-3 | Complete series | Track roller | Full compatibility |
| PC120-5 | Complete series | Track roller | Full compatibility |
| PC120-6 | Complete series | Track roller | Full compatibility |
| PC130-5 | Complete series | Track roller | Full compatibility |
| PC130-6 | Complete series | Track roller | Full compatibility |
| PC130-7 | Complete series | Track roller | Full compatibility |
| PC150-5 | Complete series | Track roller | Verified fitment |
| PC150-6 | Complete series | Track roller | Verified fitment |
| PC120-1 | Early models | Track roller | Cross-reference verified |
| PC120-2 | Mid-production | Track roller | Cross-reference verified |
✅ Direct OEM replacement for:
Komatsu part number: 141-63-05050
✅ Designed For:
Komatsu PC200/210/220/240/300/340/400 series (Dash 6, 7, 8, 10)
Undercarriage system rebuilds
Hydraulic system rebuilds
Track adjuster, roller, idler, motor, final drive seals
✅ Material Specifications:
| Component | Material | Hardness | Temperature Range |
|---|---|---|---|
| O-Rings | NBR (Nitrile) | 70-90 Shore A | -40°C to +120°C |
| U-Cup Seals | PU (Polyurethane) | 85-95 Shore A | -40°C to +100°C |
| Piston Seals | PTFE + NBR | N/A | -40°C to +150°C |
| Wiper Seals | PU | 90 Shore A | -40°C to +100°C |
| Backup Rings | PTFE | N/A | -40°C to +200°C |
| Bonded Seals | NBR + Steel | 70 Shore A | -40°C to +120°C |
| Rotary Seals | NBR / PTFE | 80-90 Shore A | -40°C to +120°C |
✅ Hydraulic Oil Compatibility:
Standard hydraulic oils (ISO VG 32, 46, 68)
Biodegradable hydraulic oils (check compatibility)
Fire-resistant fluids (check compatibility)
⚠️ Before purchasing, please verify:
| Check Item | Why It's Important |
|---|---|
| Your Exact Komatsu Model | Seal sizes vary by model and year |
| Machine Serial Number | Helps confirm specific component configuration |
| Old Part Number | Confirm the kit matches 141-63-05050 |
| Application | Undercarriage, hydraulic, or both |
| Specific Components | Verify which cylinders/pumps/motors you're rebuilding |
❌ NOT Compatible With:
Komatsu models outside the PC200-400 series (verify)
Older Dash 3/5 models (different seal sizes)
Newer Dash 11/12 models (may differ)
Non-Komatsu equipment without verification
Machines with aftermarket modifications
| Parameter | Specification |
|---|---|
| COGENG Part Number | 141-63-05050 |
| OEM Reference | Komatsu 141-63-05050 |
| Application | Blade lift/tilt cylinder seal kit (D31/D37/D39 series dozers) |
| Maximum Operating Pressure | 32 MPa (4,641 PSI) |
| Temperature Range | -40°C to +120°C (-40°F to +248°F) |
| Primary Seal Material | HNBR / Polyurethane (PU) |
| Dynamic Seal Hardness | 88 ± 3 Shore A |
| Static Seal Hardness | 75 ± 5 Shore A (FKM O-rings) |
| Fluid Compatibility | AW32, AW46, AW68 hydraulic oils, synthetic fluids |
| Compression Set | ≤ 12% (70 hours @ 110°C) |
| Pressure Cycle Rating | 300,000 cycles at 25 MPa |
| Service Life | 3,500-5,000 hours in typical dozer service |
Tools Required:
| Tool | Purpose |
|---|---|
| Seal installation tools | Prevent damage to new seals |
| Hydraulic press | For bearing/seal installation |
| Torque wrench | Achieve proper bolt torque |
| O-ring picks | Remove old O-rings without scratching |
| Cleaning tools | Clean seal grooves thoroughly |
| Hydraulic oil | Lubricate seals during installation |
Installation Tips:
⚠️ Cleanliness is critical – dirt destroys new seals immediately.
💧 Lubricate all seals with clean hydraulic oil before installation.
🔧 Never use sharp tools to install seals – risk of damage.
📐 Check seal orientation – many seals are directional.
🚫 Never reuse old seals – always use new ones from the kit.
📝 Follow torque specifications – consult machine service manual.
| Component | COGENG Part Number | Material | Hardness | Quantity |
|---|---|---|---|---|
| Piston Seal | CG-PS-05050-01 | HNBR w/ reinforcement | 88 ± 3 Shore A | 2 |
| Rod Seal (Primary) | CG-RS-05050-01 | Polyurethane (PU) | 90 ± 3 Shore A | 2 |
| Rod Seal (Secondary) | CG-RS-05050-02 | FKM/HNBR composite | 85 ± 3 Shore A | 1 |
| Heavy-Duty Wiper | CG-HDW-05050-01 | Dual-density PU | 94/82 Shore A | 1 |
| Wear Band Set | CG-WBS-05050-01 | Bronze-PTFE composite | 60 ± 5 Shore D | 4 |
| Backup Rings | CG-BKR-05050-01 | Glass-filled PTFE | N/A | 6 |
| Static O-Rings | CG-OR-05050-01 | FKM (Grade 75) | 75 ± 5 Shore A | 10 |
| Gland Seal Kit | CG-GSK-05050-01 | HNBR composite | 85 ± 3 Shore A | 1 |
| Model | Series | Cylinder Application | Compatibility |
|---|---|---|---|
| D31EX-21 | Complete series | Blade lift/tilt cylinders | Full compatibility |
| D31PX-21 | Complete series | Blade lift/tilt cylinders | Full compatibility |
| D31P-21 | Complete series | Blade lift/tilt cylinders | Full compatibility |
| D37EX-21 | Complete series | Blade lift/tilt cylinders | Full compatibility |
| D37PX-21 | Complete series | Blade lift/tilt cylinders | Full compatibility |
| D39EX-21 | Complete series | Blade lift/tilt cylinders | Full compatibility |
| D39PX-21 | Complete series | Blade lift/tilt cylinders | Full compatibility |
| D31E-21 | Complete series | Blade lift/tilt cylinders | Verified fitment |
| D31Q-21 | Complete series | Blade lift/tilt cylinders | Verified fitment |
⚠️ TRACK ROLLER SPECIFIC:
ALWAYS relieve track tension before removing any undercarriage components
MANDATORY: Fill roller with EP90 gear oil before installation
REQUIRED: Use thread locker on all mounting bolts
CHECK: Rotate roller after installation to verify smooth operation
⚠️ SEAL KIT SPECIFIC:
ALWAYS depressurize hydraulic system before service
NEVER reuse old seals or damaged components
ALWAYS use proper installation tools
To ensure correct fitment, please provide:
Komatsu Model: (e.g., PC200-7, PC210-10, PC340-7)
Machine Serial Number: (critical for verification)
Application: Undercarriage, Hydraulic, or Both
Old Kit Part Number: (if available – 141-63-05050)
✅ In Stock – Ready to Ship.
✅ MOQ 1 kit accepted for trial orders.
Contact COGENG
📞 Phone: +86-185-2913-1515 🌐 Instagram
📧 Email: hugo@cogeng.net 🌐 Facebook：Excavator Parts Selection and Replacement Community
💬 WhatsApp +86-185-2913-1515 Facebook: Excavator Wiring Harness
💬 WeChat: +86-185-7865-1106 Facebook: Excavator Wire Harness
🌐 Website: cogeng.net Facebook: Excavator SolenoidValve
