| Parameter | Specification | Testing Standard |
|---|---|---|
| Operating Pressure Range | 5-32 MPa (725-4,641 PSI) | ISO 10766 |
| Peak Pressure Handling | 45 MPa (6,527 PSI) transient | ISO 10767-1 |
| Temperature Range | -30°C to +120°C (-22°F to +248°F) | ASTM D2000 |
| Side Load Capacity | 10% of rod diameter at 25 MPa | SAE J1516 modified |
| Seal Material Density | 1.30-1.38 g/cm³ | ASTM D792 |
| Compression Set | ≤ 10% (70 hours @ 110°C) | ASTM D395 Method B |
| Tensile Strength | ≥ 18 MPa (2,611 PSI) | ASTM D412 |
| Elongation at Break | ≥ 290% | ASTM D412 |
| Abrasion Resistance | ≤ 75 mm³ loss (Taber, CS-17 wheel) | ASTM D4060 |
| Volume Swell | ≤ 7% in AW46 (168 hrs @ 100°C) | ASTM D471 |
| Friction Coefficient | 0.12-0.20 (optimized for dozer cycling) | ASTM D1894 modified |
| Thermal Conductivity | 0.29 W/m·K | ASTM E1225 |
| Specific Heat Capacity | 1.86 kJ/kg·K | ASTM E1269 |
| Pressure Cycle Rating | 250,000 cycles at 25 MPa | ISO 10767-1 |
| Contaminant Exclusion | >98% efficiency for particles >10µm | ISO 4548-12 |
| Component | COGENG Part Number | Material Composition | Hardness | D37EX-22 Specific Features | Quantity |
|---|---|---|---|---|---|
| Blade Lift Piston Seal | CG-BLPS-24650-01 | HNBR with Kevlar® reinforcement | 89 ± 2 Shore A | Asymmetric design for lift loads | 2 |
| Blade Tilt Rod Seal | CG-BTRS-24650-01 | Polyurethane (AU) with graphite | 91 ± 3 Shore A | Optimized for tilt angle changes | 2 |
| Angle Cylinder Seal | CG-ACSE-24650-01 | HNBR/FKM composite | 87 ± 2 Shore A | Low friction for frequent adjustments | 2 |
| Dozer-Specific Wiper | CG-DSWI-24650-01 | Dual-density PU with scraper | 94/80 Shore A | Extra-wide for dozer conditions | 1 |
| Heay-Duty Wear Band | CG-HDWB-24650-01 | Bronze-PTFE composite | 63 ± 5 Shore D | Increased width for stability | 2 |
| Component | Function | Material | Critical Specification | Application Specificity |
|---|---|---|---|---|
| Blade Load Compensator | Adjusts seal pressure under load | Microcellular PU | 85 ± 3 Shore A | D37EX-22 load profile optimized |
| Tilt Angle Guide | Maintains seal contact during tilt | Oil-impregnated bronze | 0.10-0.15mm oil capacity | Matched to D37 tilt mechanism |
| Grading Impact Cushion | Absorbs shock loads | Energy-absorbing PU | 88 ± 2 Shore A | Tuned to D37 grading impacts |
| Contaminant Barrier Seal | Prevents abrasive ingress | PU with magnetic particles | Captures >5µm ferrous particles | Field condition protection |
| Component Type | Material Specification | Quantity | D37EX-22 Application |
|---|---|---|---|
| Static O-Rings | FKM (Grade 70) | 8 | Hydraulic connections |
| Port Seals | HNBR with anti-extrusion | 4 | High-pressure ports |
| Backup Rings | Glass-filled PTFE | 6 | Anti-extrusion protection |
| Gasket Set | HNBR composite | 1 | Gland sealing |
| Thread Sealant | PTFE paste | 1 kit | Fitting installation |
| NO | Number | Name | Qty |
| 707-99-24650 | SERVICE KIT | 1 | |
| 707-00-0A311 | CYLINDER ASS'Y | 1 | |
| 1 | 707-11-90930 | • CYLINDER | 1 |
| 2 | 707-46-03020 | • BUSHING | 1 |
| 3 | 04065-07225 | • RING,SNAP | 2 |
| 4 | 07020-00900 | • FITTING,GREASE | 1 |
| 5 | 707-29-90601 | • HEAD,CYLINDER | 1 |
| 6 | 707-52-90220 | • BUSHING | 1 |
| 7 | 707-51-45030 | • PACKING,ROD (KIT) | 1 |
| 8 | 707-51-45640 | • RING,BUFFER (KIT) | 1 |
| 9 | 707-56-45580 | • SEAL,DUST (KIT) | 1 |
| 10 | 07179-12057 | • RING,SNAP | 1 |
| 11 | 07000-12085 | • O-RING (KIT) | 1 |
| 12 | 07146-02086 | • RING,BACK-UP (KIT) | 1 |
| 13 | 07000-12090 | • O-RING (KIT) | 1 |
| 14 | 721-58-45270 | • ROD,PISTON | 1 |
| 15 | 707-46-03020 | • BUSHING | 1 |
| 16 | 04065-07225 | • RING,SNAP | 2 |
| 17 | 07020-00900 | • FITTING,GREASE | 1 |
| 18 | 707-36-90360 | • PISTON | 1 |
| 19 | 07156-00912 | • RING,WEAR (KIT) | 1 |
| 20 | 707-44-90180 | • RING,PISTON (KIT) | 1 |
| 21 | 707-67-33010 | • NUT | 1 |
What does "D37EX-22 Specific" mean? Is this a universal kit for the entire machine?
No. "D37EX-22 Specific" indicates this kit is engineered for the cylinder architectures used on the Komatsu D37EX-22 crawler dozer series. However, a dozer has multiple hydraulic cylinders (blade lift, blade tilt, blade angle, ripper if equipped). This part number corresponds to one specific cylinder application on that model. You must verify which cylinder this kit services (typically the blade lift or tilt cylinder) before ordering.
2. Which cylinders on the D37EX-22 does this kit fit?
Part No. 707-99-24650 is most commonly assigned to the blade lift cylinder or blade tilt cylinder on the D37EX-22. It is not a complete machine set. One kit rebuilds one cylinder only. To confirm the exact application:
Locate the OEM cylinder group number stamped on the cylinder body
Identify the cylinder function: lift (raises/lowers blade) vs. tilt (angles blade for grading)
Provide your machine serial number for cross-referencing production splits
Also note: The D37EX-22 is part of the 22-series generation. Kits designed for earlier D37 models (e.g., D37EX-21) may not be interchangeable.
3. What makes the 22-series hydraulic system different from earlier D37 models?
The 22-series introduced several hydraulic refinements over earlier generations:
Higher system efficiency with reduced internal leakage tolerances
Tighter seal gland clearances requiring precise dimensional matching
Updated cylinder geometries with potentially different rod and piston diameters compared to the 21-series
Evolved sealing requirements to handle the machine's rated operating pressure and duty cycle
COGENG engineered this kit specifically for these 22-series parameters using reverse-engineered OEM data. Using an older series kit on a 22-series machine risks premature failure.
4. What is included in this precision-engineered kit?
One kit contains all seals for a complete single-cylinder overhaul:
Primary piston seal – High-performance polyurethane, designed for full-stroke cycling under load
Rod seal – Precision U-cup or compact profile for zero-leak rod sealing
Buffer ring – Absorbs pressure spikes before they reach the rod seal, extending seal life
Dust wiper / scraper – Aggressive double-lip design for maximum dirt exclusion in dozer environments
Wear rings / guide bands – Glass-filled PTFE or phenolic resin for piston and rod guidance
Static O-rings and backup rings – For gland-to-barrel interface, piston lock nut, and cylinder head
5. What are the operating specifications?
Pressure rating: Up to 35 MPa (5,075 PSI) , consistent with Komatsu D37EX-22 implement circuit specifications
Temperature range: -30°C to +110°C (-22°F to +230°F) continuous operation
Material composition: Primary seals in premium polyurethane; O-rings in NBR; wear rings in composite materials selected for side-load resistance
Fluid compatibility: Standard mineral-based hydraulic oils (ISO VG 32, 46, 68)
6. What symptoms indicate the cylinder needs this seal kit?
Blade drop / drift – Blade lowers or tilts when the control lever is in neutral
External oil leakage – Visible oil on the cylinder rod, around the gland nut, or dripping onto the dozer track frame
Slow or weak cylinder response – Indicates internal bypass across the piston seal
Oil contamination – Milky or dirty oil caused by moisture/dirt ingress through failed wiper seals
Uneven blade movement – One cylinder acting faster or slower than its paired cylinder (for dual lift cylinder configurations)
7. How do I verify correct fitment?
This is the most critical step. Before ordering:
Find the OEM cylinder number stamped on the barrel or gland of the cylinder you are rebuilding (format: 707-XX-XXXXX)
Identify the cylinder's function – Is it the lift cylinder or tilt cylinder?
Provide your machine's full serial number – The D37EX-22 may have mid-production updates
Measure if necessary – If stampings are illegible, measure rod diameter, piston diameter, and bore diameter with precision calipers
Never rely on machine model alone. A serial number break could mean two different cylinders were used on the same model designation.
8. Is this a genuine Komatsu part?
No. This is a COGENG aftermarket replacement seal kit, manufactured to match OEM Part No. 707-99-24650 specifications. It provides a cost-effective alternative to genuine Komatsu seals while delivering comparable performance when installed per factory procedures.
9. What installation guidance is available?
A seal arrangement exploded diagram is included showing correct orientation and stacking order
A full rebuild manual is not included; refer to the Komatsu D37EX-22 Shop Manual for gland torque values, rod nut torque, and bleeding/air-purge procedures
Critical installation notes:
Remove all sharp edges and burrs from seal grooves before installation
Lubricate all seals with clean hydraulic oil before assembly
Inspect the chrome rod for pits, scores, or rust — a damaged rod will destroy new seals rapidly
Torque all components to OEM specification to prevent gland back-off or seal extrusion
10. What is the shelf life?
When stored unopened in a cool (5°C–30°C / 41°F–86°F), dry environment away from direct sunlight, ozone sources (electric motors, welders), and humidity, the kit has a shelf life of up to 7 years.
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