Technical Constants & Performance Data
| Parameter | Value / Specification |
|---|---|
| Maximum Operating Pressure | Up to 4,060 PSI (280 bar) |
| Temperature Range | -40°F to 225°F (-40°C to 107°C) |
| Fluid Compatibility | Mineral-based hydraulic oils, Komatsu Super Hydraulic Fluid (KSHV), BIO HFDU fluids |
| Primary Seal Material | Polyurethane (AU), Cast Polyurethane (CU), Nitrile Rubber (NBR) |
| Seal Hardness (Dynamic) | 92-94 Shore A (Polyurethane) |
| Seal Hardness (Static) | 70 Shore A (NBR O-Rings) |
| Design Standard | Manufactured to meet or exceed Komatsu's original specifications for pressure holding, wear resistance, and service life. |
Exact Model Compatibility
| Komatsu Dozer Model | Specific Application |
|---|---|
| Komatsu D41A-6 | Blade Angle (Tilt) Cylinders |
| Komatsu D41E-6 | Blade Angle (Tilt) Cylinders |
| Komatsu D41P-6 | Blade Angle (Tilt) Cylinders |
| Note: | This kit is a direct replacement for Komatsu OEM part number 707-98-42420. It is designed specifically for the ANGLE/TILT CYLINDERS on the listed D41-6 series dozers. Verify your machine model, serial number, and that you are servicing the ANGLE CYLINDERS, not the lift or pitch cylinders. |
Component Specifications Table
| Component Name | Material | Color | Durometer | Function |
|---|---|---|---|---|
| Main Piston Seal (U-Cup) | Polyurethane (AU) | Brown | 94 Shore A | Primary dynamic pressure seal on piston |
| Rod Seal (Step Seal) | Cast Polyurethane (CU) | Black | 93 Shore A | Main rod seal for pressure retention |
| Wiper/Scraper (Heavy-Duty) | Polyurethane (PU) | Black | 90 Shore A | Excludes abrasive dirt, mud, and debris |
| Buffer Ring | Polyurethane (CU) | Black | 90 Shore A | Dampens pressure spikes to protect rod seal |
| O-Ring Kit (Assorted) | Nitrile Rubber (NBR) | Black | 70 Shore A | Static sealing for gland, end cap, and ports |
| Wear Ring / Guide Band | Glass-Filled PTFE | Dark Brown | N/A | Centralizes piston, prevents metal contact |
| Backup Rings | Nylon 6.6 | Tan | N/A | Prevents extrusion of static O-rings under pressure |
Compatibility & Application Data
| Application Sector | Target Equipment | Symptoms Addressed by This Kit |
|---|---|---|
| Site Grading & Earthmoving | Komatsu D41A-6, D41E-6, D41P-6 Bulldozers | Inability to hold blade angle ("drift"), visible hydraulic oil leakage from the rod gland, slow or weak blade tilt response, oil pooling under the machine near the cylinder. |
| Construction & Landscaping | Midsize Dozer Blade Angle Control | Loss of precise grading control, "loose" or unresponsive blade feel, increased hydraulic fluid consumption, reduced machine efficiency. |
| Heavy Equipment Repair | Scheduled Overhauls & Leak Repair | Restores factory sealing to ensure reliable blade control for precision work, prevents costly environmental fluid loss, and avoids the expense of complete cylinder replacement. |
Decompose pictures
Installation decomposition diagram
Machine Secure & Pressure Relief: Park the dozer on a firm, level surface. Lower the blade fully to the ground to relieve all hydraulic pressure. Engage the parking brake and block the tracks.
Cleanliness Protocol: Disassembly and assembly must be performed in an impeccably clean, dust-controlled environment. The abrasive nature of dozer work makes contamination control paramount.
Documented Disassembly: Carefully disassemble the tilt cylinder. Photograph and note the exact order and orientation of all components, especially the seal stack in the gland.
Critical Metal Inspection: Use precision tools to inspect the cylinder rod for any scratches, gouges, or corrosion. Check the cylinder bore (ID) for scoring, pitting, or excessive wear. Damaged metal components MUST be replaced prior to seal installation.
Lubricated Assembly: Soak all new elastomeric seals in clean hydraulic fluid. Lightly lubricate all seal grooves and sliding surfaces before installing new seals.
Proper Tool Use: Use seal installation tools (cone tools, picks, sleeves) to carefully install seals without cutting, stretching, or rolling them over sharp edges.
Torque to Specification: During reassembly, use a calibrated torque wrench. Adhere strictly to Komatsu's specified torque values and sequences for gland bolts or end caps.
Critical Specific Warnings
APPLICATION VERIFICATION IS CRITICAL: Part number 707-98-34590 is used for tilt cylinders on specific dozer models. You must verify the exact machine model this kit is designed for using official Komatsu documentation. Using it on an incompatible model or cylinder type will cause failure.
METAL SURFACE CONDITION: This kit seals fluid between precision metal surfaces. It CANNOT repair a scored rod or a worn cylinder bore. Installation on damaged components will result in immediate, severe leakage.
EXTREME ABRASIVE ENVIRONMENT: Dozer tilt cylinders are constantly exposed to dirt. Absolute cleanliness during assembly is non-negotiable to prevent rapid abrasive seal wear upon startup.
BLADE SUPPORT HAZARD: The bulldozer blade must be fully lowered and supported by the ground. Never work on a cylinder that is under load or hydraulic pressure.
Frequently Asked Questions
A. When will get the items after I place order?
Q. Once your payment is confirmed,we will arrange the goods within 1~4 days; if not in stock, we will inform you before placing the order?
A. If I only know the excavator model, but can not offer parts No.,what should I do ?
Q. If possible, you can send us pictures of old products, nameplate or the size for reference.
A. How can you guarantee the quality??
Q. We will 100% test the goods before delivery. We also support video inspection.
A. How long will it take to delivery to my address??
Q. The normal delivery time is 3-7 days, depending on which country you are in.?
A : Which delivery method will you choose?
Q : By sea, air or express(DHL,Fedex,TNT, UPS, EMS etc.)，Sometimes we will arrange as the customer's demand.
A: What's package? Can you give me the package according my requirement??
Q. We usually packed by standard exported box or carton. And yes we can pack as per your requirement.
A: Can the price be cheaper?
Q: Of course, you will be offered a good discount for a big amount.
A: Why should I choose to buy from you?
Q:Our advantages: 100% quality assurance, develop and manufature follow original ones;Quick response within 24 hours; Small order allowed;Reasonable stock and timely delivery;Neutral packing, customized packing are allowed. Positive customer feedback from abroad market;Excellent after-sales service.
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