| Parameter | Specification | Testing Standard |
|---|---|---|
| Operating Pressure Range | 0.5-5.0 MPa (73-725 PSI) | ISO 10766 |
| Response Pressure | As low as 0.2 MPa (29 PSI) | ISO 10767-1 |
| Temperature Range | -40°C to +110°C (-40°F to +230°F) | ASTM D2000 |
| Spool Diameter Range | 10-25mm (application specific) | ISO 286-2 |
| Seal Material Hardness | 70-85 Shore A (optimized for low friction) | ASTM D2240 |
| Breakaway Friction | 0.5-2.0 N (spool dependent) | Proprietary test method |
| Dynamic Friction | 0.1-0.5 N at 0.1 m/s | ISO 13738 modified |
| Leakage Rate | ≤ 0.01 ml/minute at 5 MPa | ISO 10766 |
| Response Time | < 50 ms for full spool movement | ISO 10767-1 |
| Chemical Compatibility | Compatible with AW32, AW46, and pilot fluids | ASTM D471 |
| Wear Life | 500,000 cycles minimum | ISO 10767-1 |
| Compression Set | ≤ 8% (22 hours @ 100°C) | ASTM D395 Method B |
| Thermal Conductivity | 0.25 W/m·K | ASTM E1225 |
| Dimensional Tolerance | ±0.02mm on critical dimensions | ISO 2768-f |
| Component | COGENG Part Number | Material | Dimensions | Special Features | Quantity |
|---|---|---|---|---|---|
| Spool Seals (U-Cup) | CG-SPS-13420-01 | Polyurethane (EU) | ID: 12-25mm (varies) | Low friction, precision molded | 8 |
| Spool Seals (O-Ring) | CG-SOR-13420-01 | HNBR | AS568 series | Static sealing on spools | 12 |
| End Cap Seals | CG-ECS-13420-01 | FKM/HNBR composite | Valve specific | Pressure-energized design | 4 |
| Pilot Port Seals | CG-PPS-13420-01 | NBR with anti-extrusion | Port specific | Handles pressure spikes | 6 |
| Cover Plate Gaskets | CG-CPG-13420-01 | Fiber composite | 0.3mm thickness | Non-stick surface | 2 |
| Component | Function | Material | Technical Specification |
|---|---|---|---|
| Detent Ball | Spool position retention | Chrome steel 52100 | 58-62 HRC, 6mm diameter |
| Spring Set | Spool centering/return | Music wire | Various rates for different valves |
| Wear Sleeve | Spool bore protection | Bronze alloy | 0.02mm wall, precision honed |
| Backup Rings | Anti-extrusion protection | PTFE composite | Low friction, high temperature |
| Dust Seals | External contamination barrier | Nitrile rubber | Keeps dirt out of valve body |
| NO | Number | Name | Qty |
| 1 | 707-98-13420 | SERVICE KIT,LIFT AND ANGLE CYLINDER | 4 |
| 707-51-35210 | • PACKING | 1 | |
| 175-63-75190 | • SEAL | 1 | |
| 07000-12065 | • O-RING | 1 | |
| 07001-02065 | • RING | 1 | |
| 07000-02070 | • O-RING | 1 | |
| 707-44-70070 | • RING | 1 | |
| 07156-00710 | • RING | 1 | |
| 2 | 707-98-23070 | • SERVICE KIT,TILT CYLINDER | 1 |
| 707-51-40210 | • PACKING | 1 | |
| 198-63-75190 | • SEAL | 1 | |
| 07000-12075 | • O-RING | 1 | |
| 07001-02075 | • RING | 1 | |
| 07000-02080 | • O-RING | 1 | |
| 707-44-80070 | • RING | 1 | |
| 07156-00810 | • RING | 1 |
What exactly does this kit seal? Is it for the main control valve or the pilot valve?
This kit is specifically for the pilot control circuit components, not the main boom/bucket spool valves. It is designed to seal the PPC (Proportional Pressure Control) pilot valves — the joystick/lever-actuated valves in the cab that send low-pressure pilot oil to shift the main control valve spools.
2. What Komatsu equipment is this kit typically used on?
It is a universal pilot valve seal kit compatible with a wide range of Komatsu excavators, dozers, and loaders that use the standard Komatsu PPC valve design. Common applications include PC200, PC300, PC400 series excavators, D65/D85 dozers, and WA loaders, but always verify by matching your pilot valve assembly number stamped on the valve body.
3. What is included in this "Precision Sealing System"?
The kit is a complete service set for one pilot valve block/assembly (note: one joystick typically contains multiple plunger assemblies). It generally includes:
Spool/plunger seals
Gland O-rings and backup rings
Dust boots or wiper seals
Body-to-mounting surface gaskets or O-rings
All necessary soft parts to eliminate external pilot oil leaks and internal cross-port leakage
4. What are the benefits over genuine Komatsu seals?
COGENG engineers this as a precision-molded aftermarket alternative. Key claimed advantages:
Material match: High-grade polyurethane and NBR formulated to resist pilot circuit pressures (typically 3–6 MPa / 435–870 PSI)
Dimensional precision: CNC-machined molding to match OEM spool-to-bore tolerances, ensuring crisp joystick response and zero drift after rebuild
Cost savings: Typically 50–70% less expensive than a genuine kit while meeting OEM performance specs
5. What are the signs that I need this seal kit?
The most frequent failure symptoms prompting purchase:
Pilot oil leaking from the base of the joystick or around the spool caps inside the cab
Sluggish or delayed implement response
Joystick "drift" or inability to hold fine metering positions
External oil contamination on the pilot valve assembly
6. Is this a complete kit for one full joystick (both spools)?
Not necessarily. One kit typically services one pilot valve block or a specific set of spools. A single joystick (e.g., for boom and bucket) may contain 2–4 individual plunger assemblies. Please confirm the kit's scope with the supplier — you may need multiple kits to rebuild an entire joystick.
7. What are the installation prerequisites?
Installation requires:
Clean work environment — pilot valves are precision components
Technical manual for correct assembly sequence and torque specs
Hy-Tran or equivalent clean hydraulic oil for pre-lubrication
Post-installation, a pilot pressure check and joystick stroke calibration may be required per Komatsu service procedures
8. Is there a risk of incompatibility if my machine has been retrofitted?
Yes. Some older machines are retrofitted with non-OEM joysticks or third-party pilot systems. COGENG kits are designed for standard Komatsu PPC valve series. If your machine's pilot valve has been replaced with a different brand, provide the valve assembly number before ordering.
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