Komatsu Pc1250-8 Hydraulic Excavator Factory Service Manual

Komatsu Pc1250-8 Hydraulic Excavator Factory Service Manual

Komatsu Pc1250-8 Hydraulic Excavator Factory Service Manual

Komatsu PC1250-8 Service Maintenance: Ensuring Optimal Performance and Longevity

This collection contains the following 4 manuals:
Komatsu SAA6D170E-5 shop manual. 170E-5 series engine
Komatsu SAA6D170E-5 training guide
Komatsu PC1250-8 operation & maintenance manual
Komatsu PC1250-8 workshop manual.

Manual descriptions:
Komatsu Pc1250-8 workshop service manual. This is a factory manual. 1170 pages.

Model and serial number range covered by this manual:
PC1250-8 s/n 30001 and up
PC1250SP-8 s/n 30001 and up
PC1250LC-8 s/n 30001 and up


The Komatsu PC1250-8 is a powerful and reliable hydraulic excavator used in various heavy-duty construction and mining applications. To ensure the machine’s longevity and optimal performance, regular service and maintenance are crucial.

This article provides a comprehensive guide to the service maintenance of the Komatsu PC1250-8 excavator, covering key aspects such as routine inspections, fluid checks, filter replacements, lubrication, and preventive maintenance.

By following these guidelines, operators can maximize the efficiency, productivity, and lifespan of this exceptional piece of machinery.

Table of Contents

  1. Introduction
  2. Routine Inspections
  3. Fluid Checks
  4. Filter Replacements
  5. Lubrication
  6. Preventive Maintenance
  7. Undercarriage Maintenance
  8. Electrical System
  9. Safety Considerations
  10. Conclusion
  11. FAQs
    1. How often should routine inspections be performed on the Komatsu PC1250-8 excavator?
    2. What fluids need to be checked in the excavator, and how often?
    3. When should filters be replaced in the Komatsu PC1250-8 excavator?
    4. What lubrication points should be maintained regularly?
    5. What are some safety considerations when performing service maintenance on the excavator?

Routine Inspections

Regular inspections are essential to identify potential issues and ensure the overall health of the Komatsu PC1250-8 excavator. Perform the following inspections on a routine basis:

  1. Visual Inspection: Inspect the excavator for any signs of damage, leaks, or loose components. Pay attention to the undercarriage, boom, arm, and bucket.
  2. Structural Inspection: Check the structural integrity of the excavator, including welds, bolts, and pins. Look for any signs of wear, cracks, or deformation.
  3. Hydraulic System Inspection: Inspect hydraulic hoses, fittings, and cylinders for any leaks or damage. Ensure proper hydraulic fluid levels.
  4. Electrical System Inspection: Check the electrical connections, lights, and switches for proper functioning.

Komatsu Pc1250-8 Hydraulic Excavator Factory Service Manual

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Fluid Checks

Regularly check the following fluids in the Komatsu PC1250-8 excavator:

  1. Engine Oil: Check engine oil levels and inspect for any signs of contamination or discoloration. Follow the manufacturer’s recommendations for the type of oil and oil change intervals.
  2. Hydraulic Fluid: Inspect hydraulic fluid levels and check for any signs of contamination. Maintain proper fluid cleanliness to ensure optimal performance.
  3. Coolant: Monitor coolant levels and inspect for proper concentration and any signs of leakage. Maintain the appropriate coolant mixture and replace as needed.
  4. Fuel: Regularly check the fuel level and ensure that the fuel system is free from any leaks or blockages.

Filter Replacements

Regular filter replacements are crucial for maintaining the efficiency and longevity of the Komatsu PC1250-8 excavator. Follow the manufacturer’s recommendations for filter replacement intervals, which typically include:

  1. Engine Oil Filter: Replace the engine oil filter according to the specified interval or if it becomes clogged or contaminated.
  2. Hydraulic Filters: Regularly replace the hydraulic filters to ensure clean hydraulic fluid and optimal performance of the hydraulic system.
  3. Fuel Filters: Replace the fuel filters at recommended intervals to prevent contamination of the fuel system and ensure proper fuel flow.


Proper lubrication is essential for reducing friction, minimizing wear, and maximizing the lifespan of components in the Komatsu PC1250-8 excavator. Follow these guidelines for lubrication:

  1. Boom, Arm, and Bucket Joints: Regularly lubricate the boom, arm, and bucket joints to maintain smooth operation and prevent premature wear.
  2. Undercarriage Components: Apply lubrication to undercarriage components, including track links, rollers, and idlers, according to the manufacturer’s recommendations.
  3. Pins and Bushings: Ensure that pins and bushings receive proper lubrication to prevent excessive wear and maintain the excavator’s overall performance.

Preventive Maintenance

Implementing preventive maintenance measures is crucial for avoiding unexpected breakdowns and extending the life of the Komatsu PC1250-8 excavator. Consider the following preventive maintenance tasks:

  1. Regular Inspections: Perform routine inspections and address any issues promptly before they escalate.
  2. Scheduled Maintenance: Follow the manufacturer’s recommended maintenance schedule for servicing, inspections, and replacements.
  3. Cleaning and Washing: Regularly clean the excavator to remove dirt, debris, and contaminants that can cause damage or corrosion.
  4. Storage and Winterization: Properly store the excavator during periods of inactivity and follow recommended procedures for winterization to prevent cold-weather-related issues.

Undercarriage Maintenance

The undercarriage plays a vital role in the performance and stability of the Komatsu PC1250-8 excavator. Follow these maintenance tips for the undercarriage:

  1. Track Tension: Regularly check and adjust the track tension to ensure proper track alignment, reduce wear, and maintain stability.
  2. Track Shoe Condition: Inspect the track shoes for wear and damage. Replace any worn-out or damaged track shoes promptly.
  3. Track Cleaning: Clean the tracks regularly to remove mud, debris, and other materials that can contribute to accelerated wear and damage.

Electrical System

The electrical system of the Komatsu PC1250-8 excavator requires proper maintenance for reliable operation. Consider the following:

  1. Battery Maintenance: Inspect the battery regularly for signs of corrosion or damage. Clean and tighten the battery connections as necessary.
  2. Wiring and Connections: Check the wiring and electrical connections for any signs of wear, damage, or loose connections. Repair or replace as needed.

Safety Considerations

Safety should always be a top priority during service maintenance of the Komatsu PC1250-8 excavator. Follow these safety considerations:

  1. Lockout/Tagout: Implement lockout/tagout procedures to ensure the excavator is safely shut off and isolated from any energy sources during maintenance.
  2. Personal Protective Equipment: Wear appropriate personal protective equipment, including gloves, safety glasses, and steel-toed boots, to protect against potential hazards.
  3. Proper Lifting Techniques: Use proper lifting equipment and techniques when handling heavy components to prevent injuries.
  4. Follow Manufacturer Guidelines: Adhere to the manufacturer’s guidelines and safety instructions provided in the operator’s manual.


Proper service maintenance is crucial for ensuring the optimal performance, efficiency, and longevity of the Komatsu PC1250-8 excavator. By following the guidelines for routine inspections, fluid checks, filter replacements, lubrication, preventive maintenance, and adhering to safety considerations, operators can maximize the productivity and reliability of this exceptional machine. Regular maintenance and timely addressing of any issues will contribute to a safe and efficient working environment.

Komatsu Pc1250-8 Hydraulic Excavator Factory Service Manual