Common Faults And Repair Techniques of Shandong Lingong Loaders

With the rapid development of the second-hand construction machinery market, SDLG (Shangong) front loaders are widely used in many construction and mining projects around the world due to their high cost-effectiveness, easy operation and convenient maintenance. However, as the equipment ages, various mechanical failures are inevitable. This article will systematically sort out the common failures, troubleshooting ideas and maintenance techniques of SDLG loaders to help you extend the service life of the equipment and reduce maintenance costs.

If you want to buy or wholesale second-hand SDLG loaders, please contact Jiecheng second-hand excavator supplier via email guo@machbro.com, or visit the official website: https://www.machbro.com.

Common problems and maintenance tips for hydraulic systems

Hydraulic oil temperature is too high

Cause analysis:

Improper selection of hydraulic oil (viscosity is too low)

Oil cooler is blocked or damaged

Hydraulic pump or motor efficiency is reduced

Maintenance suggestions:

Replace hydraulic oil suitable for local climate (such as anti-wear hydraulic oil 68#)

Cleaning or replacing cooler

Check and repair hydraulic pump and motor wear

Working device moves slowly

Possible reasons:

Leakage in hydraulic system

Insufficient setting pressure of main overflow valve

Distribution valve is stuck or blocked

Handling suggestions:

Check hoses and joints for oil leakage

Calibrate overflow valve pressure to standard value

Disassemble and inspect distribution valve, clean or replace worn parts

Lifting arm shakes or falls by itself

Judgment points:

Lifting cylinder leaks or oil seals age

Hydraulic oil mixed with air

Multi-way valve failure

Maintenance measures:

Replace cylinder oil seal or assembly

Ventilate thoroughly and replace hydraulic oil

Disassemble and replace multi-way valve seal

Common engine failures and repair suggestions

Difficult cold start

Possible causes:

Battery power loss or damage

Poor atomization of fuel injector

Preheating device failure

Repair measures:

Replace battery or charge maintenance

Cleaning or replacing fuel injector

Check preheating plug circuit and fuse

Engine emits black smoke

Technical analysis:

Air filter element is clogged

Injection system sprays too much fuel

Supercharger failure

Troubleshooting suggestions:

Replace air filter element

Check injection pump injection pressure and range

Disassemble and check whether the supercharger impeller is worn or stuck

Water temperature is too high alarm

The causes may be:

Radiator blockage or water tank scaling

Water pump belt slippage

Thermostat failure

Suggested treatment methods:

Clean radiator, replace coolant

Tighten or replace belt

Check and replace thermostat

Common faults and troubleshooting methods of transmission system

Shift impact or gear knocking

Cause analysis:

Shift valve wear or jamming

Clutch plate slippage or ablation

Hydraulic control delay

Repair methods:

Replace shift valve assembly

Replace clutch friction plate

Check transmission hydraulic control circuit

Driving powerless or unable to move forward/reverse

Core problems:

Insufficient pressure of transmission pump

Damage to internal gears of drive axle

Deterioration of hydraulic oil quality

Handling suggestions:

Inspect and repair transmission pump

Check drive axle assembly and replace damaged gears

Replace deteriorated hydraulic oil

Wheel reducer oil leakage

Common causes:

Aging or improper installation of oil seal

Blocked vents causing oil pressure to rise

Excessive work intensity causing bearing damage

Maintenance measures:

Replace high-quality oil seals

Clean vents

Replace wheel bearings

Common problems with electrical and control systems

No display on the instrument panel or flashing alarm lights

Diagnostic suggestions:

Loose battery wiring or poor grounding

Damaged or water-infiltrated control panel

Line short circuit or control module failure

Maintenance methods:

Tighten the battery terminals

Disassemble the controller to clean and reseal

Use a multimeter to check the circuit section by section

Air conditioning system does not cool

Possible situations:

Refrigerant leakage

Compressor damage

Electromagnetic clutch failure

Solution suggestions:

Refill refrigerant and check for leaks

Replace compressor

Repair or replace air conditioning electromagnetic clutch

SDLG loader common faults and treatment comparison table

Conclusion

Through the in-depth analysis of common faults of SDLG front loaders and the arrangement of maintenance skills, we can see that equipment maintenance focuses on prevention and standardized operation. For customers who use second-hand loaders, the equipment itself has a certain age and wear and tear, so it is crucial to choose a reliable second-hand excavator supplier.

If you are looking for a stable, efficient and reasonably priced second-hand SDLG loader, please contact Jiecheng second-hand excavator supplier. We provide all kinds of second-hand loading equipment that have been strictly tested and maintained, and support global wholesale and export business.

Visit the official website for more information: https://www.machbro.com

Email contact: guo@machbro.com