Excavator Fuel Filters 944412 Filters Customized Panel

Problems and Solutions in the Use of chassis parts for construction machinery

The following are common usage problems and systematic solutions for construction machinery chassis components, classified and organized based on working condition characteristics and failure mechanisms:
I. Abnormal wear and derailment of the track system
The ‌ polygon effect causes vibration ‌
Youdaoplaceholder0 problem ‌ : Resonance occurs when the track link meshes with the drive wheel, causing the track to jump, make abnormal noises and accelerate wear.
Youdaoplaceholder0 solution ‌ :
Clean the dirt, sand and stones in the gaps of the tracks every day to prevent foreign objects from intensifying the vibration.
For soft ground surfaces, loosen the tracks (sag ≤30mm), and for hard ground surfaces, tighten them (sag ≤15mm).
Youdaoplaceholder0 track plate and track link failure ‌
Youdaoplaceholder0 Problem ‌ : Track plate crack >5mm, edge wear >30% or chain track pitch elongation >10mm (from 174mm to 184mm).
Youdaoplaceholder0 solution ‌ :
Replace the failed track plates in time to prevent the teeth of the drive wheels from being ground into a knife-edge shape.
Regularly flip the track pins 180° for installation to balance wear.
Ii. Steering system failure
Abnormal wear caused by ‌ steering operation ‌
Youdaoplaceholder0 problem ‌ : When turning in place on a concrete road surface or when crossing an obstacle greater than 30cm, it accelerates the deformation of the track link and the wear of the drive wheel.
Youdaoplaceholder0 solution ‌ :
Do not turn in place on hardened roads. Keep going straight when crossing obstacles.
The turning radius of the track equipment should be controlled within no more than 1.5 meters.
Youdaoplaceholder0 hydraulic steering failure ‌
Youdaoplaceholder0 problem ‌ : Heavy steering or uneven left and right steering force, mostly due to hydraulic oil contamination, oil pump damage or distribution valve failure.
Youdaoplaceholder0 solution ‌ :
Check the cleanliness of the hydraulic oil (reaching NAS level 8) and replace the clogged filter element.
Replace the worn distribution valve assembly and adjust the pressure.
Iii. Seal Failure and Oil Leakage
Youdaoplaceholder0 The floating oil seal ages and leaks oil ‌
Youdaoplaceholder0 problem ‌ : Foreign matter intrusion or oil temperature ≥150℃ causes the oil seal to harden and crack.
Youdaoplaceholder0 solution ‌ :
Clean the mud and sand around the oil seal every week and add high-temperature grease after wading through water.
Stop the machine to cool down after continuous operation for 2 hours to prevent thermal deterioration of the oil seal.
Youdaoplaceholder0 hydraulic cylinder leakage ‌
Youdaoplaceholder0 Problem ‌ : The depth of scratches on the chrome-plated surface is greater than 0.1mm or the seal is worn.
Youdaoplaceholder0 solution ‌ :
Repair the scratched cylinder barrel and replace the high-temperature resistant sealing parts (such as fluororubber material);
When the tensioning cylinder is filled with oil, the operator should stand sideways to prevent the oil nozzle from popping out.
Iv. Structural Deformation and Fracture
Youdaoplaceholder0 frame cracking ‌
Youdaoplaceholder0 problem ‌ : Weld crack >50mm or single-wheel load of the idler wheel >8 tons causes stress concentration in the frame.
Youdaoplaceholder0 solution ‌ :
Annual magnetic particle flaw detection is required. If the crack exceeds the limit, carbon arc air gouging and re-welding are necessary.
For heavy-duty working conditions (such as mines), a reinforced chassis is adopted, and the strength of the transmission chain is increased by 40%.
The axial clearance of the ‌ idler wheel/idler wheel is too large ‌
Youdaoplaceholder0 problem ‌ : Axial clearance greater than 2mm causes the track to deviate.
Youdaoplaceholder0 solution ‌ :
Monthly inspection intervals: Replace immediately if the deviation is exceeded.
Swap the front and rear idler wheels for use every 1,000 hours to balance wear

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