Slow or weak hydraulics
Boom, arm or bucket moving slowly, weak digging response and main-pump versus pilot-system questions.
YUANJIAN / EXCAVATOR TECHNICAL SUPPORT
Excavator Technical Support Center
Excavator troubleshooting, fault diagnosis, repair manuals and technical support, organized by symptom, brand and model. Explore real catalogue previews before requesting the references for your machine.
Excavator Troubleshooting & Repair Topics
Start with the symptom, then check the full model, serial number, engine and controller. The links below lead to public guides or clearly identified reference catalogues, not one repair procedure for every excavator.
One track slow or weak
Travel-motor and final-drive inspection references, with model-specific guidance for unequal track movement.
Engine starting, overheating & warning symptoms
Find engine systems-operation references and request the matching troubleshooting material for your engine variant and symptom.
Fault codes, wiring & hydraulic diagrams
Identify the controller, photograph the exact warning or code and select the correct electrical or hydraulic reference before discussing repairs.
Swing bearing play & slew-system concerns
A public inspection guide for swing-bearing play and slew-system review, linked to the evidence to request before purchase.
High fuel use & operating-cost questions
A practical fuel-consumption guide with operating context, rather than one promised litres-per-hour figure for every used excavator.
Choose a brand. Inspect the catalogue.
XCMG
Hydraulic circuits, electrical drawings and monitor-harness references, separated by XE model and configuration.
Browse models & contents
SUMITOMO
SH200/SH220 hydraulic and electrical references, older A1/A2 collections and fault-diagnosis volumes.
Browse models & contents
DAEWOO / DOOSAN
DH electrical sheets, Solar component references and DX shop manuals with publication codes and serial applicability.
Browse models & contents
CASE
CX210 workshop sections, CX330 parts references and CX55B hydraulic, electrical, testing and assembly chapters.
Browse models & contents
SANY
SY workshop manuals, hydraulic/electrical diagrams, model-specific parts references and SY365 service training.
Browse models & contents
HYUNDAI
R-series references organized into structure/function, hydraulics, troubleshooting, performance tests and workshop chapters.
Browse models & contents
KOMATSU
PC200/220-6 shop references, separate PC300-6 technical volumes, PC-7 wiring and 102-series engine resources.
Browse models & contentsChoose the technical task
| Need | Reference to request |
|---|---|
| Understand normal operation | Systems operation / structure and function. |
| Interpret a symptom or warning | Troubleshooting matched to the controller and model. |
| Measure condition | Testing and adjustment, including conditions and limits. |
| Plan workshop repair | Disassembly / assembly, not only a parts illustration. |
| Follow a circuit or identify a component | Hydraulic / electrical diagrams or the correct parts reference. |
Technical reading linked to actual machines
A Supplier You Can Evaluate Beyond the Sales Listing
YUANJIAN MACHINERY INTERNATIONAL TRADING LIMITED is a direct used excavator supplier in China with our own refurbishment team. Our technical library sits alongside real workshop records and machine-specific inspection media, so buyers can review both the equipment and the support available after purchase.
YUANJIAN MACHINERY INTERNATIONAL TRADING LIMITED
Free Technical Resources + 5-Year Machine Guidance
Customers who purchase a used excavator from YUANJIAN receive available, applicable technical resources at no extra charge and free machine-use, maintenance and troubleshooting guidance for 5 years after purchase. Send the full model, serial number, engine or pump details, the exact symptom and your purchase reference so our team can check the appropriate resources.
Full-document access, safety and service terms
Public HTML contains YUANJIAN-written explanations and selected catalogue metadata. Preview images are YUANJIAN-compiled index cards, not manufacturer covers or full manual pages. Complete documents are not publicly downloadable; supply depends on availability, applicability and permission. No manufacturer authorization is implied. This bilingual catalogue does not translate the complete source manuals, which include Chinese, English and scanned material.
Five-year guidance covers operation, maintenance questions and troubleshooting communication. It is not a five-year warranty and excludes free parts, consumables, freight, on-site labor and repairs. Pressure tests, electrical measurements, adjustments, lifting and disassembly require qualified technicians, safe isolation and the correct current service instructions. Do not bypass safety systems or adjust pressure from an unmatched diagram.