This hydraulic shear maintenance manual applies to all types of guillotine hydraulic plate shearing machine (common models such as QC11Y/QC11K). Please refer to the specific equipment manual and on-site working conditions before proceeding.

1. Hydraulic Shear Maintenance Objectives

- Ensure shearing accuracy and stability.

- Extend the lifespan of the hydraulic system and mechanical structure.

- Reduce failure rate and downtime risk.

- Ensure operational safety.

2. Daily Maintenance (per shift/day)

1) Pre-start Inspection

- Check if the hydraulic oil level is within the indicated range.

- Observe for leaks in the oil pipes, joints, and valve blocks.

- Check if the blade fixing bolts and material clamping device are loose.

- Check if the back gauge and limit switches are sensitive.

2) Precautions During Operation

- Pay attention to any abnormal noise or vibration during shearing.

- Observe if the pressure gauge is stable.

- Do not shear beyond specifications (thickness, material).

3) Post-shutdown Maintenance

- Clean metal shavings from the worktable and blade edge.

- Wipe the guide rails and back gauge screw surface.

- Turn off the power and disconnect the hydraulic system.

3. Weekly Maintenance

- Check the wear of the blade edges.

- Check if the pressure cylinder returns to its normal position.

- Check the lubrication of the back gauge screw and guide rail.

- Check for loose or aged electrical wiring.

- Check the hydraulic oil temperature.

4. Monthly Maintenance

1) Hydraulic System

- Clean the hydraulic oil tank vent filter cap.

- Check the hydraulic oil color, for bubbles and impurities.

- Check the working status of the oil pump and relief valve.

2) Mechanical Structure

- Verify that the blade clearance meets material requirements.

- Check the frame, slide block, and connecting rod for abnormal wear.

- Tighten critical bolts (tool holder, main cylinder seat).

3) Lubrication

- Replenish lubrication to the guide rails, lead screw, and shaft pins.

- Use the specified type of lubricating oil/grease.

5. Quarterly/Semi-annual Maintenance

- Replace or clean the hydraulic oil filter element.

- Calibrate the back gauge positioning accuracy.

- Check the limit switches and light curtains (if present).

- Check for aging of cylinder seals.

6. Annual Maintenance (or 2000–3000 hours)

- Replace the hydraulic oil (according to the manufacturer's specified model).

- Comprehensively check the hydraulic valve assembly and pump efficiency.

- Inspect or flip the cutting tools (replace if necessary).

- Check the electrical control system and CNC system parameter backups.

7. Cutting Tool Maintenance Points

- Keep the cutting edge clean and prevent impacts.

- Regularly check the cutting tool clearance and parallelism.

- Turn or regrind the cutting tool promptly after dulling.

- Changing cutting tools must be done in pairs and symmetrically.

8. Common Faults and Maintenance Strategies (Practical Table)

9. Importance of Hydraulic Shear Maintenance

1) Ensure Shearing Accuracy and Product Quality

- Regular hydraulic shear maintenance maintains blade sharpness and proper clearance.

- Prevents large burrs and skewing caused by guide rail and blade holder wear.

- Ensuring accurate back gauge positioning and improving dimensional consistency.

Result: Stable shearing quality and significantly reduced rework rate.

2) Extend Equipment Lifespan

- Clean hydraulic oil reduces wear on oil pumps, valve groups, and cylinders.

- Timely lubrication prevents premature damage to guide rails and pins.

- Preventative maintenance is more effective than reactive repair.

Result: Lifespan of key components extended by over 30%.

3) Reduce Failure Rate and Downtime Risk

- Most failures stem from oil contamination, loose fasteners, and insufficient lubrication.

- Daily and periodic maintenance allows for early detection of potential problems.

- Avoids sudden downtime affecting production plans.

Result: More continuous production and more controllable delivery times.

4) Ensure Operational Safety

- Inadequate maintenance can easily lead to material clamping failure, malfunctions, and oil leaks. - Regularly inspecting electrical and hydraulic systems reduces safety risks.

- Complies with workshop safety and shear machine management regulations.

Result: Reduced workplace injuries and equipment accidents.

5) Reduce Overall Operating Costs

Result: The average annual maintenance cost per unit of equipment decreased significantly.

10. Typical Fault & Maintenance Correlation Comparison Table (After-sales Focus)

11. Summary

Standardized maintenance = stable accuracy + fewer malfunctions + lower cost

1 Inspection (Before Start-up)

- Check oil level, blades, and operation.

- Oil level should be normal with no leakage.

- Blades should not be loose when pressing material.

- Back gauge should run smoothly.

2 Inspection (During Production)

- No unusual noises, vibrations, or odors.

- Shearing sound should be uniform.

- Hydraulic shearing machine should run smoothly.

- Hydraulic system should not overheat.

3 Prohibitions (Must Be Followed)

- No cutting excessively thick or hard materials.

- No cutting materials with malfunctions.

- Do not exceed the equipment's rated thickness.

- Do not cut unknown materials.

- Immediately stop the hydraulic shear machine and report any abnormalities.

4 Cleaning (After get off work)

- Clean metal filings, clean blade edges, clean the worktable.

- Clean metal filings from the worktable.

- Wipe the blade edges and guide rails clean.

- Reset the hydraulic shears and disconnect the power.