Document Version: 1.0
Date of Issue: October 26, 2023
Product Category: Hydraulic Components / Excavator & Loader Spare Parts
Manufacturer Reference: Komatsu OEM Reference
This document serves as the comprehensive technical specification for the hydraulic component identified by part number 707-52-91551. This part is a critical component within the hydraulic cylinder systems of heavy construction and mining machinery, specifically designed for Komatsu equipment including excavators, wheel loaders, and bulldozers.
The purpose of this document is to provide engineers, mechanics, procurement specialists, and maintenance teams with a complete understanding of the physical specifications, compatibility, installation protocols, and maintenance requirements for this specific part number.
The 707-52-91551 is identified in the Komatsu parts catalog as a Rod Bushing (also referred to as a hydraulic cylinder rod bushing or jack bushing). This component is a precision-machined cylindrical sleeve installed in the cylinder head or rod end of a hydraulic cylinder. Its primary function is to guide and support the piston rod, ensuring proper alignment and smooth linear motion while withstanding side loads and reducing friction between the rod and the cylinder head bore.
The bushing is engineered to operate under extreme pressures and heavy loads, typical of mining and construction environments. It is manufactured from high-grade bronze alloy or bearing steel, with precision tolerances to ensure a proper fit and long service life .
Key Functional Characteristics:
Precision Bore: Inner diameter of 180mm, designed for exact fit with the piston rod
Load Bearing: Withstands radial loads and side forces during cylinder operation
Wear Resistance: Constructed from high-grade bearing materials for extended service life
Self-Lubricating Properties: May incorporate lubrication grooves or bronze construction for reduced friction
Corrosion Resistance: Suitable for operation in harsh outdoor environments
Precision Manufacturing: Machined to exacting tolerances for proper rod alignment
180mm Rod Compatibility: Designed specifically for hydraulic cylinders with 180mm rod diameter
90mm Height: Bushing height of 90mm provides adequate support surface area
Bronze Alloy Construction: Typical material for rod bushings, offering excellent wear characteristics
Precision Machined: Manufactured to OEM specifications for perfect fit
Easy Installation: Designed for press-fit or slip-fit installation depending on application
The following list details the components associated with the 707-52-91551 rod bushing. This part is typically a single component, but the following table details the bushing itself and related service components.
| Item No. | Part Number | Description | Quantity | Material |
|---|---|---|---|---|
| 1 | 707-52-91551 | Rod Bushing (180mm) | 1 | Bronze / Bearing Steel |
| 2 | 707-52-91550 | Rod Bushing (Interchangeable) | 1 | Bronze / Bearing Steel |
| 3 | 707-52-91552 | Rod Bushing (Alternate) | 1 | Bronze / Bearing Steel |
| 4 | 707-52-91553 | Rod Bushing (Alternate) | 1 | Bronze / Bearing Steel |
Note: The 707-52-91550 is listed as a related part number and may be interchangeable or a superseded version. Always verify with the specific machine serial number .
When replacing a rod bushing, the following components should be inspected and replaced if necessary:
Rod Seal Kit: The seal kit for the corresponding cylinder (see 707-98 series kits)
Dust Wiper Seal: Located outboard of the bushing
O-Ring (Bushing): Seals the bushing to the cylinder head
Piston Rod: Inspect for wear, scoring, or chrome damage
Cylinder Head: Inspect bore for wear or damage
The part number 707-52-91551 is primarily designed for Komatsu heavy equipment. Based on available catalog data, this part is compatible with the following machine series.
This part is most commonly found on the following machine models :
Komatsu D575A-2 (Bulldozer)
Komatsu D575A-3 (Bulldozer)
Komatsu WA800-1 (Wheel Loader)
Komatsu WA800-2 (Wheel Loader)
Komatsu WA800-3E0 (Wheel Loader)
Komatsu WA900-1 (Wheel Loader)
Komatsu WA900-3 (Wheel Loader)
Komatsu WA1200-3 (Wheel Loader)
When searching for this part, you may encounter the following interchangeable or related part numbers :
707-52-91550 (Primary interchange)
707-52-91552 (Potential alternate)
707-52-91553 (Potential alternate)
Warning: While these numbers are often interchangeable, the specific suffix number usually denotes a specific revision or application. It is crucial to confirm the exact dimensions and machine compatibility before ordering.
Installing a hydraulic cylinder rod bushing is a precision operation. Failure to follow these precautions can result in immediate damage to the bushing, hydraulic contamination, or personal injury.
Verify Part Number: Ensure the new bushing matches the old bushing exactly. Check the inner diameter (180mm), outer diameter, and height (90mm) .
Cleanliness: The hydraulic system is highly sensitive to contamination. Clean the area around the cylinder before disassembly.
Hydraulic Oil: Check the hydraulic tank for debris or metallic particles. If the old bushing failed catastrophically, the entire hydraulic system must be flushed.
Inspect Mating Parts: Check the piston rod for scratches, dents, or excessive wear. Check the cylinder head bore for scoring or damage.
Check Cylinder Head Bore: Measure the cylinder head bore to ensure it is within specification for the new bushing.
Disassembly: Carefully disassemble the hydraulic cylinder. Remove the cylinder head and extract the old bushing using a press or bushing removal tool.
Cleaning: Thoroughly clean all metal components with a suitable solvent. Dry with compressed air.
Inspection: Inspect the cylinder head bore for wear, scoring, or damage. If the bore is damaged, the cylinder head may need to be replaced or machined.
Bushing Installation: If the bushing is a press-fit design, use a hydraulic press or bushing driver to install it squarely into the cylinder head bore. If it is a slip-fit design, ensure it slides in smoothly without excessive play.
Lubrication: Lubricate the inner bore of the bushing with clean hydraulic oil or assembly grease.
Assembly: Reassemble the cylinder head onto the cylinder. Tighten the cylinder head bolts to the specified torque.
This is the most critical step.
Fill Casing: Before connecting the hydraulic hoses, fill the cylinder with clean hydraulic oil.
Air Bleeding:
Start the engine at low idle.
Slowly operate the cylinder in both directions to circulate oil.
Loosen the hose fitting slightly to allow air to escape until oil flows out, then tighten.
Check for Leaks: Inspect all connections for leaks while the system is under pressure.
Final Check: Check the hydraulic oil level in the tank and top up if necessary.
Crush Hazard: The hydraulic cylinder and cylinder head are heavy. Ensure proper lifting equipment is used.
High Pressure: Hydraulic fluid under pressure can penetrate the skin. Relieve pressure before disconnecting lines.
Hot Oil: Allow the system to cool before servicing.
Pinch Points: Keep hands and fingers away from moving parts during installation.
Press Hazard: Use proper guarding when using a hydraulic press to install or remove bushings.
This section provides a detailed breakdown of the equipment compatible with the 707-52-91551, including specific model years and regional variations.
The 707-52 series is commonly used in large Komatsu wheel loaders. These machines are ubiquitous in the mining, quarry, and heavy construction sectors.
Komatsu WA800-1: Early generation large wheel loader. The 707-52-91551 is used in the lift and tilt cylinder assemblies .
Komatsu WA800-2: Updated version of the WA800. The rod bushing specification remains consistent.
Komatsu WA800-3E0: Later generation WA800. This model uses the 707-52-91551 bushing in its hydraulic cylinders .
Komatsu WA900-1: Larger capacity wheel loader. The 707-52-91551 is compatible .
Komatsu WA1200-3: One of Komatsu's largest wheel loaders. The 707-52-91551 bushing is used in the main lift cylinders .
Komatsu D575A-2: Super-large bulldozer. The 707-52-91551 is used in the blade lift and tilt cylinders .
Komatsu D575A-3: Updated D575A model. The bushing specification is consistent .
To ensure compatibility with your specific machine:
Locate the Serial Number: Find the machine's serial number plate (usually in the cab).
Check the Parts Manual: Consult the official Komatsu parts manual for your specific serial number range.
Visual Inspection: Compare the old bushing with the new bushing. Check the dimensions (inner diameter, outer diameter, thickness) of the bushing .
Measure the Cylinder: Measure the rod diameter (should be 180mm) and cylinder head bore diameter to confirm the bushing size .
Q1: What is the part number 707-52-91551 exactly?
A: The 707-52-91551 is a Rod Bushing (also called a hydraulic cylinder rod bushing or jack bushing) used in Komatsu heavy equipment including wheel loaders (WA800, WA900, WA1200 series) and bulldozers (D575A series) .
Q2: What are the dimensions of the 707-52-91551?
A: The bushing has an inner diameter of 180mm and a height of 90mm . The outer diameter is designed to fit the cylinder head bore of the compatible machines.
Q3: Can I replace just the bushing without replacing the cylinder?
A: Yes, provided the cylinder rod and cylinder head bore are in good condition. If the rod is scratched or the head bore is scored, those components should be replaced or repaired.
Q4: Why does my hydraulic cylinder leak?
A: Leaking can be caused by:
Worn rod seal: Replace the seal kit.
Damaged rod: Replace or repair the rod.
Worn bushing: Replace the rod bushing.
Contaminated oil: Flush the system and replace the oil.
Q5: What is the warranty period for this part?
A: Standard warranty for these hydraulic components is typically 6 to 12 months, depending on the supplier. However, warranty is void if the unit is disassembled, if the system was not flushed after a previous failure, or if the wrong hydraulic oil was used.
Q6: Can I use this bushing on a different brand of equipment?
A: It is not recommended unless you are a qualified hydraulic engineer. While the bushing might physically fit, the dimensions and load ratings may not match the host machine's requirements, leading to poor performance or failure.
Q7: What type of hydraulic oil should I use?
A: Always use the oil specified by the equipment manufacturer. Typically, this is an ISO VG 46 anti-wear hydraulic oil. Using the wrong viscosity can cause overheating and internal damage.
Q8: Do I need to replace the hydraulic filter after installing a new bushing?
A: Yes. It is highly recommended to replace the return filter and the suction filter immediately after installation. If the old bushing failed, the system should be flushed, and the filters replaced again after 50 hours of operation.
Q9: What is the typical lead time for this part?
A: Lead times vary. Standard stock items may ship within 24-48 hours. Custom or non-stock items may take 15-30 days for manufacturing or sourcing.
Q10: How do I identify if I have a genuine OEM part or an aftermarket replacement?
A: Genuine OEM parts will have the Komatsu logo and part number cast or stamped into the metal. Aftermarket parts may have the part number but lack the logo. Aftermarket parts can be of high quality or low quality. Always source from a trusted supplier.
Q11: What is the difference between 707-52-91551 and 707-52-91550?
A: The 707-52-91550 is listed as a related part number and may be interchangeable or a superseded version. Always verify with the specific machine serial number before ordering .
Q12: How do I install a rod bushing?
A: Rod bushings are typically press-fit into the cylinder head. Use a hydraulic press and proper bushing driver to install the bushing squarely. Do not use a hammer, as this can damage the bushing and the cylinder head bore.
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End of Document
Disclaimer: This document is for informational purposes only. The manufacturer reserves the right to change specifications without notice. Always consult the official service manual for your specific machine before performing any repairs. Part numbers and compatibility are based on industry cross-reference data and may vary by region and production year.
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