COGENG 707-99-22300 707-99-14990 Komatsu D39EX-23 Angle Cylinder Seal Kit

Technical Constants & Performance Data

Primary Angle Cylinder Seals

D39EX-23 Specific Components

Support Seals & Hardware

Critical D39EX-23 Specific Warnings

⚠️ ANGLE CYLINDER SPECIFIC REQUIREMENTS:

• ONLY for D39EX-23 angle cylinder - not for lift or tilt cylinders

• REQUIRED: Follow Komatsu D39EX-23 service manual exactly

• MANDATORY: Use blade angle lock during service

• CRITICAL: Verify angle calibration after installation

⚠️ PERFORMANCE-SENSITIVE FACTORS:

• Linkage condition affects seal performance

• Hose routing must accommodate full angle range

• Control valve adjustment may be required

• Electronic angle control calibration needed

⚠️ SAFETY CONSIDERATIONS:

• Blade can move unexpectedly if not properly secured

• Hydraulic pressure can be retained in angle circuit

• Linkage pins under tension during removal

• Track movement possible if not properly blocked

Why are there two part numbers listed for this kit?
These two numbers represent different cylinder applications or generational updates on the D39EX-23 angle blade system, but they are often cross-referenced in the aftermarket:

• 707-99-14990 – Typically associated with earlier production D39EX-23 models and certain angle cylinder configurations

• 707-99-22300 – Generally corresponds to later production runs or a superseded part number

COGENG may supply these as a unified kit or as two distinct assemblies. You must verify which cylinder is being serviced — left angle, right angle, or a tandem pair — and confirm the corresponding OEM number stamped on the cylinder body.

2. What is the angle cylinder, and what does it do?
On a Komatsu D39EX-23 crawler dozer equipped with a PAT (Power Angle Tilt) blade, the angle cylinders allow the operator to angle the blade left or right — typically up to 25 degrees — without leaving the cab. This is essential for backfilling, windrowing material, and side-casting while moving forward. The angle function is distinct from the blade tilt and lift circuits.

3. Which specific machine is this kit for?
This kit is engineered specifically for the Komatsu D39EX-23 (also cross-compatible with certain D39PX-23 swamp variants). It may also fit other D39 series machines equipped with the angle blade option, but fitment is not guaranteed across all D39 sub-models or production years. Always verify using the cylinder's stamped OEM part number.

4. Is this a complete kit for one angle cylinder?
Yes. One kit provides all seals for a single angle cylinder overhaul, including:

• Piston seal assembly – High-pressure U-cup or compact piston seal

• Rod seal – Primary pressure seal for the rod

• Buffer ring – Pressure spike protection before the rod seal

• Dust wiper / scraper – Heavy-duty exclusion seal

• Wear rings / guide bands – For piston and rod gland

• Static seals – O-rings and backup rings for gland threads, piston nut, and cylinder head

If you are rebuilding both left and right angle cylinders, you will need two kits.

5. What are the critical specifications for this kit?

• Operating pressure: Rated for standard Komatsu dozer implement circuits up to 35 MPa (5,075 PSI)

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

• Seal materials: Primary dynamic seals in high-performance polyurethane; O-rings in NBR; wear rings in glass-filled PTFE or phenolic composite

• Design philosophy: Engineered for the compact cylinder geometry typical of D39-class angle circuits, with tight gland envelopes and high-duty-cycle operation

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