Longgong LG850 Loader User Report

[MikePhua]

I have used three Longgong LG850 loaders, with the following purchase timeline: the first in early 2007, the second in mid-2008, and the third in late 2009. All three machines weigh 15.8 tons, and while they all exhibit some common traits, such as occasional rear-end lifting when in use, the following report outlines my experience with this particular model, based on my usage of these three units.
1. Engine
The engines of the Longgong LG850 loaders are all from the Weichai series. The first two units use the WD615 engine, while the third one is equipped with the WD10 engine, meeting the Euro III emission standards. From the specifications, we can see that the WD10 engine has a smaller bore and stroke, but the power remains the same (162kw), and the fuel consumption per kilowatt hour is lower.

• The WD10 engine features an oil-water separator filter, and the fuel filter has been integrated into a complete assembly.
  
• The first vehicle uses a cable-operated shutdown switch, while the second and third units use an electromagnetic valve shutdown system, which unfortunately has a shorter lifespan.
  

In terms of performance, the first vehicle experienced oil leakage around the cylinder head and the turbocharger, which was positioned close to the cylinder head, making it difficult to seal. The first vehicle also required several parts to be replaced, including water plugs, a fuel pump, and an oil injector. Additionally, the starter motor's gear was damaged. The cold-start process requires a higher throttle, as the engine initially lacks power and emits white smoke, which dissipates after warming up. The idle speed was adjusted higher to prevent stalling.
The second and third units also had similar issues with water plugs leaking and electromagnetic valve failure. The turbocharger’s sealing paper gasket was replaced in the third unit.
2. Transmission (Double Gearbox)

• The first vehicle's double gearbox remains in good condition.
  
• The second vehicle needed a gearbox repair after 3,000 hours, primarily due to bearing failure in the torque converter. The bearings used in the system were from ZWZ.
  
• The third vehicle felt slightly slower to respond when shifting gears after the vehicle was new.
  

3. Drive Axles

• The first vehicle has required repairs to the front axle numerous times. After the most recent repair, it was suspected that the axle housing bolts were not tightened correctly, causing oil leaks. The half-axle also broke once, and the braking system often leaks oil. The hydraulic pump was replaced, and the original Henan Fengshen tires, which were heavily worn, were replaced with remanufactured tires.
  
• The second vehicle had an issue with the planetary gears in the front axle, which repeatedly failed within a short period. The gears were damaged and got stuck inside, requiring the tires to be removed for repairs.
  

4. Hydraulic System
The hydraulic system has been a major headache. The piping layout is extremely messy, with many pipes interfering with each other. Despite the passage of time, from the first vehicle to the third, there have been no improvements. Many hydraulic pipes leak oil, and several have been replaced. The hydraulic return pipe on the first vehicle detached twice, draining an entire tank of hydraulic oil — a painful experience. The steering mechanism and distribution valve have also experienced consistent leaks shortly after use.
Both the first and second vehicles use hydraulic pumps from Jinan Hydraulic Factory, while the third vehicle uses a self-produced Longgong hydraulic pump, which has been performing well.
The hydraulic cylinders are also from Longgong's in-house brand, Haikelis. The first vehicle’s four hydraulic cylinders experienced severe wear, and the original hydraulic cylinders were eventually discarded. The first replacement cylinder also started to experience wear. The second vehicle had the arm oil seals replaced.
5. Miscellaneous Issues

• The first vehicle has had an ongoing issue with the upper pin of the bucket constantly breaking.
  
• Despite these mechanical challenges, Longgong’s paintwork is notable. The older machines maintain a new appearance even after being washed.
  

Summary
Overall, the Longgong LG850 loader has had a variety of issues, particularly with the hydraulic system, engine seals, and drive axles. While it continues to perform reasonably well for general tasks, frequent maintenance and repairs are required to ensure smooth operation. The hydraulic system, in particular, has been a consistent point of concern, with repeated oil leaks and the need for parts replacements.
In terms of performance, the engine and transmission have proven to be reliable, but the drive axle and hydraulic components require careful attention. I would recommend maintaining a strict maintenance schedule and monitoring hydraulic components closely to avoid significant downtime.
While the Longgong LG850 can fulfill standard operational requirements, prospective buyers should be prepared for regular servicing and repairs, especially concerning the hydraulic and axle systems.