COGENG 707-99-24640 Komatsu Dozer Blade Tilt Cylinder Seal Kit

Technical Constants & Performance Data

Primary Tilt Cylinder Seals

Dozer-Specific Components

Support Seals & Hardware

Primary Applications

Specific Model Compatibility

Serial Number Compatibility

Cylinder Identification Guide

1. Workspace Specifications:

   • Clean environment (ISO 4406 Class 8/7/5 minimum)

   • Adequate lifting capacity for cylinder (typically 50-150kg)

   • Dedicated cylinder work station

   • Temperature controlled: 15-25°C (59-77°F)

2. Specialized Tools Required:

   • Cylinder holding fixture

   • Bearing press tools (if bushing replacement needed)

   • Dial indicator set (0.001mm resolution)

   • Torque wrench set (calibrated)

   • Micrometer set (0-200mm range)

   • Surface finish comparator

3. Safety Protocols:

   • Complete hydraulic system depressurization

   • Blade properly supported and secured

   • Track blocking and machine stabilization

   • Eye protection during disassembly

What is a blade tilt cylinder, and is this kit only for tilt circuits?
The blade tilt cylinder is the hydraulic cylinder responsible for angling the dozer blade left or right for grading, ditching, and slope work. This kit is designed specifically for that tilt cylinder. It is not a universal dozer cylinder kit — it will not fit blade lift cylinders or ripper cylinders unless dimensional cross-referencing confirms compatibility.

2. Which Komatsu dozer models does this kit fit?
This kit commonly services the blade tilt cylinders on medium and large Komatsu crawler dozers, including:

• D65 series (D65EX, D65PX, D65WX)

• D85 series (D85EX, D85PX)

• D155 series (D155AX)

• Potentially D275 and D375 models

Always verify by cross-referencing your cylinder's OEM part number or by providing the rod and piston diameters.

3. Why is it called a "Comprehensive" and "Heavy-Duty" sealing system?
The designation indicates this is a complete, application-engineered kit that includes all dynamic and static seals for a full cylinder overhaul:

• Heavy-duty piston seal — designed for high side-load conditions typical of blade tilt operations

• Rod seal and buffer seal — engineered to handle dirt, dust, and abrasive ingress

• Wiper/dust seal — aggressive lip design for maximum contaminant exclusion

• Wear rings / guide rings — phenolic or glass-filled PTFE for side-load resistance

• All static O-rings and backup rings for gland, piston, and cylinder head

The sealing materials are selected for prolonged exposure to shock loads, high temperatures, and contaminated environments typical of dozer undercarriage work.

4. What operating conditions is this kit built to withstand?

• Pressure rating: Standard Komatsu dozer implement circuits operate up to 35 MPa (5,075 PSI) ; kit is rated accordingly

• Temperature range: -30°C to +110°C (-22°F to +230°F) continuous

• Environmental resistance: Formulated for high-abrasion environments with constant exposure to dirt, rock dust, moisture, and wide temperature swings

• Shock load tolerance: Piston and rod seals are designed to handle the severe pressure spikes common when boulders or hard ground cause rapid cylinder reversals

5. Is this a genuine Komatsu part or aftermarket?
This is a COGENG high-quality aftermarket replacement kit, manufactured to exact OEM tolerances for Komatsu Part No. 707-99-24640. It provides a cost-effective alternative while matching the performance characteristics of the genuine seal set.

6. What should I check before ordering to avoid receiving the wrong kit?
To eliminate fitment errors, you must verify one of the following:

• The OEM cylinder group part number stamped on the cylinder body (e.g., 707-00-XXXXX or 707-01-XXXXX format)

• Precise measurements: rod diameter, piston diameter, and bore diameter

• The machine serial number and cylinder application (tilt vs. lift)

Do not rely on machine model alone — year splits, regional variants, and prior service cylinder replacements can all affect fitment.

7. What are the common symptoms indicating this cylinder needs a reseal?

• Visible hydraulic oil leaking down the cylinder rod

• Blade "drift" or inability to hold a set tilt angle under load

• Sluggish or jerky tilt response

• External oil accumulation around the gland nut or cylinder head

• Contaminated oil from dirt and water ingress past damaged wiper seals

8. Do you include installation instructions or torque specifications?
The kit includes an exploded diagram showing seal arrangement and stacking order for the gland and piston. However, COGENG does not provide full rebuild instructions. We strongly recommend referencing the Komatsu Shop Manual for your specific model to obtain correct gland torque values, rod nut torque, and bleeding procedures. Improper installation is the leading cause of premature seal failure.

9. What is the shelf life and recommended storage?
When stored unopened in a sealed package at 5°C to 30°C (41°F to 86°F), away from direct sunlight, ozone-generating equipment, and humidity, the shelf life is up to 7 years. Storage near electric motors, welders, or in direct sunlight will significantly degrade seal materials even before opening.
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