ID：1825973

• Brand: Sany
  
• Model: SY55U
  
• Year of Manufacture: 2024
  
• Operating Hours: 670 hours
  
• Location: Jiangxi-Pingxiang
  

• Brand: Sany
  
• Model: SY55U
  
• Year of Manufacture: 2024
  
• Operating Hours: 670 hours
  
• Location: Jiangxi-Pingxiang
  
• Operating Weight: 5200 kg
  
• Bucket Capacity: 0.152 m³
  
• Power Type: Conventional diesel
  
• Manufacturer: Domestic
  
• Bucket Type: Backhoe
  

• Ground Pressure: 29.4 KPa
  
• Swing Speed: 10 rpm
  
• Climbing Ability: 70% (30°)
  
• Bucket Digging Force: 32.5 kN
  
• Arm Digging Force: 22.9 kN
  
• Travel Speed: 4.1 / 2.4 km/h
  
• Swing Torque: 10 kN·m
  

• Fuel Tank: 78 L
  
• Hydraulic Oil Tank: 52 L
  
• Engine Oil Replacement: 9 L
  

• Track Length: 400 mm
  
• Idler Wheels (per side): 1
  
• Carrier Rollers (per side): 4
  
• Track Shoes (per side): 39
  

                               

ID：1825960

• Brand: Caterpillar
  
• Model: 320C
  
• Year of Manufacture: 2003
  
• Hours: 8,800 hours
  
• Location: Guangdong - Shenzhen
  

• Engine Model: CAT 3066 ATAAC
  
• Rated Power: 110 kW at 1800 rpm
  
• Cooling System: Water-cooled
  
• Cylinder Bore × Stroke: 102 × 130 mm
  
• Displacement: 6.4 L
  
• Power Type: Conventional diesel
  
• Manufacturer: Joint venture/import
  

• Ground Pressure: 48.02 kPa
  
• Swing Speed: 11.5 rpm
  
• Bucket Digging Force: 132 kN
  
• Arm Digging Force: 99 kN
  
• Travel Speed: 5.5 km/h
  

• Bucket Cylinder: 1 × 120 mm × 1030 mm
  
• Arm Cylinder: 1 × 140 mm × 1430 mm
  
• Boom Cylinder: 2 × 120 mm × 1260 mm
  

• Fuel Tank: 320 L
  
• Hydraulic Oil Tank: 120 L
  
• Engine Oil Replacement: 30 L
  
• Coolant: 24 L
  
• Total Hydraulic System: 200 L
  

• Transport Length: 9390 mm
  
• Transport Width: 2800 mm
  
• Transport Height: 3050 mm
  
• Cabin Height: 3050 mm
  
• Minimum Ground Clearance: 460 mm
  
• Rear Swing Radius: 2770 mm
  
• Track Length: 4070 mm
  
• Track Gauge: 2200 mm
  
• Track Shoe Width: 600 mm
  
• Total Track Width: 2800 mm
  
• Track Ground Contact Length: 3260 mm
  

• Maximum Digging Depth: 6550 mm
  
• Maximum Digging Height: 9440 mm
  
• Maximum Dumping Height: 6770 mm
  
• Maximum Vertical Digging Depth: 5440 mm
  
• Maximum Excavation Radius at Ground Level: 9710 mm
  

                       

ID：1825905

• Brand: Shandong Lingong
  
• Model: E655FS
  
• Year of Manufacture: 2020
  
• Operating Hours: 5400 hours
  
• Location: Wenzhou, Zhejiang
  

• Brand: Shandong Lingong
  
• Model: E655FS
  
• Year of Manufacture: 2020
  
• Operating Hours: 5,400 hours
  
• Location: Wenzhou, Zhejiang
  
• Operating Weight: 6,050 kg
  
• Rated Power: 39 kW
  
• Bucket Type: Backhoe
  
• Power Source: Conventional diesel
  

• Transport Length: 5,970 mm
  
• Transport Width: 1,960 mm
  
• Transport Height: 2,610 mm
  

                               

ID：1825951

• Brand: Sumitomo
  
• Model: SH330-3
  
• Year of Manufacture: 2010
  
• Hours: 19,000 hours
  
• Location: Guangdong-Huizhou
  

• Engine Model: Isuzu AH-6HK1X
  
• Rated Power: 184 kW at 2000 rpm
  
• Cylinders: 6
  
• Displacement: 7.79 L
  
• Cooling: Water-cooled
  
• Operation Type: Four-stroke, direct injection, fully electronically controlled, turbocharged diesel with intercooler
  

• Ground Pressure: 67 kPa
  
• Swing Speed: 9.6 rpm
  
• Gradeability: 70% (approx. 35° slope)
  
• Bucket Digging Force: 229 kN (standard), 248 kN (power mode)
  
• Arm Digging Force: 164 kN (standard), 178 kN (power mode)
  
• Travel Speed: 3.2 / 5.5 km/h
  

• Main Relief Pressure: 34.3 / 37.3 MPa
  
• Swing Hydraulic Motor: Fixed displacement axial piston
  
• Travel Hydraulic Motor: Variable displacement axial piston ×2
  
• Main Pump Type: Variable displacement axial piston ×2 + Gear Pump ×1
  

• Fuel Tank: 580 L
  
• Hydraulic Oil Tank: 350 L
  

• Transport Length: 11,040 mm
  
• Transport Width: 3,200 mm
  
• Transport Height: 3,290 mm
  
• Cab Height: 3,130 mm
  
• Counterweight Ground Clearance: 1,210 mm
  
• Minimum Ground Clearance: 480 mm
  
• Front Working Equipment Swing Radius: 4,500 mm
  
• Rear Swing Radius: 3,450 mm
  
• Track Total Length: 4,650 mm
  
• Track Gauge: 2,600 mm
  
• Track Shoe Width: 600 / 800 mm
  
• Track Ground Contact Length: 3,720 mm
  

• Maximum Digging Radius: 11,170 mm
  
• Maximum Digging Depth: 7,340 mm
  
• Maximum Digging Height: 10,370 mm
  
• Maximum Dumping Height: 7,230 mm
  
• Maximum Vertical Digging Depth: 6,350 mm
  
• Dozer Blade: Not equipped
  

                               


ID：1825949

• Brand: SANY
  
• Model: SY135C (China Stage IV)
  
• Year of Manufacture: 2021
  
• Operating Hours: 4100 hours
  
• Location: Huizhou, Guangdong
  

• Operating weight: 13,500 kg
  
• Bucket capacity: 0.6 m³
  
• Rated tonnage: 13 tons
  
• Power source: Conventional diesel engine
  
• Manufacturer: Domestic (China)
  
• Bucket type: Backhoe
  

• Engine model: Isuzu 4JJ1
  
• Rated power: 86 kW at 2200 rpm
  
• Maximum torque: 375 N·m at 1800 rpm
  
• Displacement: 2.999 L
  
• Fuel type: Diesel, direct injection, turbocharged
  

• Ground pressure: 41.7 kPa
  
• Swing speed: 12 rpm
  
• Gradeability: 70%
  
• Bucket digging force: 103 kN
  
• Arm digging force: 67 kN
  
• Travel speed: 5.5 km/h (high) / 3.5 km/h (low)
  

• Fuel tank: 280 L
  
• Hydraulic oil tank: 200 L
  
• Engine oil change: 16 L
  

• Track shoe width: 500 mm
  
• Idler wheels (per side): 1
  
• Carrier rollers (per side): 7
  
• Track shoes (per side): 44
  

                               

ID：1825933

• Brand: SANY
  
• Model: SY245H (China Stage IV)
  
• Year of Manufacture: 2019
  
• Operating Hours: 5100 hours
  
• Location: Zigong, Sichuan
  

• Brand: SANY
  
• Model: SY245H (China Stage IV)
  
• Year of Manufacture: 2019
  
• Operating Hours: 5100 hours
  
• Location: Zigong, Sichuan
  

• Weight Class: 25 tons
  
• Operating Weight: 25,500 kg
  
• Bucket Capacity: 1.4 m³
  
• Power: Conventional diesel power
  
• Manufacturer: Domestic production
  
• Bucket Type: Backhoe
  

• Ground Pressure: 52.5 KPa
  
• Swing Speed: 10 rpm
  
• Gradeability: 70%
  
• Bucket Digging Force: 175 kN (up to 187 kN in power mode)
  
• Arm Digging Force: 120 kN (up to 129 kN)
  
• Travel Speed: 5.8 / 3.7 km/h
  

• Transport Length: 10,290 mm
  
• Width: 3,190 mm
  
• Height: 3,255 mm
  
• Minimum Ground Clearance: 470 mm
  
• Front Swing Radius: 3,800 mm
  
• Tail Swing Radius: 3,105 mm
  
• Track Length: 4,445 mm
  
• Track Gauge: 2,590 mm
  
• Track Shoe Width: 600 mm
  
• Track Ground Contact Length: 3,640 mm
  
• Maximum Height at Minimum Swing Radius: 8,016 mm
  

• Maximum Digging Radius: 10,225 mm
  
• Maximum Digging Depth: 6,705 mm
  
• Maximum Digging Height: 9,745 mm
  
• Maximum Dumping Height: 6,715 mm
  
• Maximum Vertical Digging Depth: 5,675 mm
  

• Use genuine filters and lubricants to extend engine life beyond 15,000 operating hours.
  
• Regularly check track tension to avoid accelerated wear on the undercarriage.
  
• When working in high-altitude regions like Tibet, monitor turbocharger performance to prevent power loss.
  
• For contractors working on soft soil, consider wider track shoes to reduce ground pressure.
  

                                   

ID：1825932

• Brand: SDLG (Shandong Lingong)
  
• Model: E6205FS
  
• Year of Manufacture: 2018
  
• Hours: 8,000 hours
  
• Location: Chizhou, Anhui
  

• Operating weight: 20 tons
  
• Power type: Traditional diesel engine
  
• Bucket type: Backhoe bucket
  
• Manufacturer: Domestic Chinese production
  

• Engine oil condition and replacement intervals
  
• Hydraulic filter and pump efficiency
  
• Undercarriage wear, especially track chains and rollers
  
• Bucket teeth and cutting edge condition
  

                                   

ID：1825926

• Brand: XCMG
  
• Model: XE205DA
  
• Year of Manufacture: 2021
  
• Hours: 5,500 hours
  
• Location: Shaoyang, Hunan
  

• Brand: XCMG
  
• Model: XE205DA
  
• Year of Manufacture: 2021
  
• Hours: 5,500
  
• Location: Shaoyang, Hunan
  

• Operating Weight: 21,500 kg
  
• Bucket Capacity: 1.0–1.2 m³
  
• Boom Length: 5,680 mm
  
• Arm Length: 2,910 mm
  
• Power Type: Conventional diesel
  
• Bucket Type: Backhoe
  

• Rated Power: 135 kW at 2050 rpm
  
• Injection: Direct injection, four-stroke
  
• Cooling: Water-cooled with air-to-air intercooler
  

• Ground Pressure: 47.5 kPa
  
• Swing Speed: 12 rpm
  
• Gradeability: 35%
  
• Maximum Traction: 184 kN
  
• Travel Speed: 5.7 / 3.1 km/h
  

• Fuel Tank: 400 L
  
• Hydraulic Tank: 220 L
  
• Engine Oil Change Volume: 24 L
  

• Transport Length: 9,630 mm
  
• Width: 2,910 mm
  
• Height: 3,100 mm
  
• Counterweight Clearance: 1,050 mm
  
• Minimum Ground Clearance: 486 mm
  
• Tail Swing Radius: 2,890 mm
  
• Track Gauge: 2,290 mm
  
• Track Length: 4,155 mm
  
• Shoe Width: 600 mm
  

• Max Digging Radius: 9,760 mm
  
• Max Digging Depth: 6,660 mm
  
• Max Digging Height: 9,540 mm
  
• Max Dumping Height: 6,780 mm
  
• Max Vertical Digging Depth: 6,480 mm
  

• Maintain engine oil replacement every 250–300 hours to extend engine life.
  
• Regularly monitor hydraulic filters to avoid cavitation damage.
  
• Consider retrofitting GPS telematics for performance tracking and fuel management.
  

                               

ID：1825931

• Brand: Kobelco
  
• Model: SK75-8
  
• Year of Manufacture: 2012
  
• Hours: 13,000 hours
  
• Location: Haikou, Hainan
  

• Brand: Kobelco
  
• Model: SK75-8
  
• Year of Manufacture: 2012
  
• Hours: 13,000 hours
  
• Location: Haikou, Hainan
  

• Operating Weight: 6,850 kg
  
• Bucket Capacity: 0.4 m³
  
• Arm Length: 1,710 mm
  
• Ton Rating: 7 tons
  
• Origin: Chengdu, China
  
• Power Type: Conventional engine
  
• Manufacturer: Joint venture/imported
  
• Bucket Type: Backhoe
  

• Engine Model: Isuzu 4LE2XCUA
  
• Rated Power: 42 kW / 2,200 rpm
  
• Cooling System: Water-cooled
  
• Bore x Stroke: 85 mm x 96 mm
  
• Maximum Torque: 211 N·m / 1,600 rpm
  
• Number of Cylinders: 4
  
• Displacement: 2.179 L
  
• Operating Mode: Direct injection, turbocharged, intercooled
  

• Ground Pressure: 30.8 kPa
  
• Swing Speed: 11.5 rpm
  
• Gradeability: 70%
  
• Bucket Digging Force: 52.7 kN
  
• Arm Digging Force: 39.4 kN
  
• Maximum Traction: 72.2 kN
  
• Travel Speed: 5.3 km/h forward / 2.8 km/h reverse
  

• Main Pump Max Flow: 132 L/min
  
• Travel Hydraulic Circuit: 29.4 MPa
  
• Swing Hydraulic Circuit: 24.5 MPa
  
• Main Pump Type: Variable displacement axial piston pump
  
• Pilot Pump Flow: 18 L/min
  
• Bucket Cylinder: 1 × 80 mm × 735 mm
  
• Arm Cylinder: 1 × 95 mm × 833 mm
  
• Boom Cylinder: 1 × 110 mm × 916 mm
  

• Fuel Tank: 140 L
  
• Hydraulic Tank: 67 L
  
• Engine Oil Change Volume: 11 L
  
• Coolant: 8.5 L
  
• Hydraulic System Volume: 107 L
  

• Transport Length: 6,200 mm
  
• Transport Width: 2,320 mm
  
• Transport Height: 2,650 mm
  
• Minimum Ground Clearance: 375 mm
  
• Front Minimum Swing Radius: 1,760 mm
  
• Rear Swing Radius: 1,750 mm
  
• Track Length: 2,830 mm
  
• Track Gauge: 1,870 mm
  
• Track Shoe Width: 450 mm
  
• Track Shoe Number (per side): 39
  

• Maximum Digging Radius: 6,460 mm
  
• Maximum Digging Depth: 4,170 mm
  
• Maximum Digging Height: 7,400 mm
  
• Maximum Dumping Height: 5,330 mm
  
• Maximum Vertical Digging Depth: 3,480 mm
  
• Dozer Blade Lift/Push Depth: 475 mm / 305 mm
  
• Dozer Blade Width × Height: 2,320 × 460 mm
  
• Parking Surface Max Digging Radius: 6,310 mm
  
• Maximum Effective Digging Depth: 3,810 mm
  

• Monitor hydraulic system pressure to prevent performance drop.
  
• Maintain engine oil and coolant to prevent overheating in tropical climates.
  
• Inspect track tension regularly to ensure stability during high-grade operations.
  
• Consider attachments such as hydraulic hammers or grapples to expand versatility.
  

Introduction
The John Deere 270DLC is a robust and versatile machine, widely used in construction and excavation projects. However, like any complex hydraulic system, it can experience issues that affect performance. One common problem operators encounter is slow hydraulic response, particularly in functions such as boom, bucket curl, and tracks, while the swing motor may still operate normally. Understanding the potential causes and solutions can help in diagnosing and rectifying these issues efficiently.
Common Symptoms
Operators have reported several symptoms indicative of hydraulic issues:

• Slow Boom and Track Movement: Both the boom and tracks exhibit sluggish movement, lacking power.
  
• Uneven Track Speeds: One track moves faster than the other, leading to a dog-tracking effect.
  
• Normal Swing Operation: The swing motor maintains full hydraulic strength, operating at expected speeds.
  

1. Hydraulic Pump Issues: While the swing motor operates normally, other functions may suffer if the hydraulic pump is not delivering adequate pressure.
   
2. Pilot System Malfunctions: The pilot system controls the main control valve. Any issues here can lead to reduced hydraulic response.
   
3. Filter Blockages: Clogged filters, such as the pilot filter, can restrict fluid flow, leading to sluggish hydraulic functions.
   
4. Control Valve Problems: Sticking or malfunctioning control valves can impede hydraulic fluid flow, affecting performance.
   
5. Hydraulic Fluid Contamination: Contaminants in the hydraulic fluid can cause internal wear and reduced efficiency.
   

1. Check Hydraulic Fluid Levels: Ensure that the hydraulic fluid is at the correct level and in good condition.
   
2. Inspect Filters: Examine and replace filters if they are clogged or dirty.
   
3. Monitor Pump Pressures: Use diagnostic tools to check the pressures of the hydraulic pumps.
   
4. Test Pilot System: Verify the functionality of the pilot system and its components.
   
5. Evaluate Control Valves: Inspect control valves for any signs of sticking or malfunction.
   

• Regular Fluid Changes: Change the hydraulic fluid at intervals recommended by the manufacturer.
  
• Filter Replacements: Replace filters as per the maintenance schedule to ensure clean fluid flow.
  
• System Flushing: Periodically flush the hydraulic system to remove contaminants.
  
• Component Inspections: Regularly inspect hydraulic components for wear and tear.