123‑8686 ELECTRIC STARTING MOTOR ASSEMBLY for CAT D9R D11R D10R
123‑8686 ELECTRIC STARTING MOTOR ASSEMBLY is a heavy‑duty 24‑volt DC electric starting assembly designed for CAT D9R, D11R and D10R large track‑type tractors. This pre‑lube integrated starter motor delivers high cranking torque to drive engine flywheel rotation, completing cold‑start and normal startup for large‑displacement diesel engines. Adopting SAE No.1 special nose housing mounting flange and high‑strength pinion gear, it provides reliable starting performance under low‑temperature, dusty and high‑vibration open‑pit mining and earth‑moving site conditions.
Provide cranking torque for large diesel engine startup, with pre‑lubrication function
Condition
New, Standard OEM Specification
Origin
China
Warranty
6 months
Applications
Suitable for: Open‑pit mining stripping, large‑scale earth‑moving, highway & railway subgrade construction, stockyard bulk‑material handling and other heavy‑duty working scenarios for CAT large track‑type dozers.
Why Choose Us
Full‑range CAT large dozer spare parts supply
We supply starting motors, engine assemblies, undercarriage and wearing components for CAT D9R, D11R, D10R track‑type dozers, supporting accurate procurement by OEM part number.
Strict pre‑shipment quality inspection
Each 123‑8686 electric starting motor assembly undergoes electrical cranking test, load performance inspection and dimensional calibration before shipment to adapt to low‑temperature and high‑vibration mine‑site working conditions.
Stock support for key starting‑system components
Electric starting motor assemblies are critical core assemblies of dozer engine starting system. We maintain available inventory to respond quickly to urgent on‑site maintenance demands and shorten equipment downtime.
Cost‑effective replacement spare parts
We deliver factory‑direct CAT replacement components for global machinery dealers, repair workshops and construction‑site contractors without extra intermediate costs.
Mature global export service
We serve customers in multiple countries, providing complete export documents, heavy‑duty shock‑proof rust‑proof wooden‑case packaging and flexible sea‑air transport solutions for cross‑border delivery.
Professional pre‑sales compatibility check
If you are not sure whether this electric starting motor assembly fits your CAT machine, provide the machine serial number, our team will confirm matching status within 24 hours to prevent wrong‑ordering.
Packaging
Electrical terminals and pinion gear are fitted with protective caps for dust‑proof and anti‑rust protection. The starting motor assembly is wrapped with thick shock‑absorbing cushioning material to avoid collision, thread and gear damage in transit. Reinforced heavy‑duty export wooden case is adopted, clearly marked with exact part number for inventory management and customs clearance.
Shipping
Sea freight is recommended for this heavy‑weight item for cost saving. Air freight can be arranged for urgent repair work. In‑stock items will be shipped within 3‑7 working days after payment confirmation. Complete packing list and export documents will be provided.
FAQ
Q1: How do I confirm this electric starting motor assembly fits my CAT dozer?
Please send us your machine serial number and model, we will check compatibility for you before placing the order.
Q2: What symptoms mean the electric starting motor assembly needs replacement?
Difficult engine cranking, insufficient starting torque, abnormal knocking noise during startup, solenoid no‑action are typical failure signs.
Q3: What is your delivery time?
In‑stock goods ship within 3‑7 working days. For out‑of‑stock items, we will confirm the exact lead time before order confirmation.
Q4: What does the warranty cover?
6‑month warranty covers manufacturing defects. Damage caused by improper installation, unstable power supply, overload cranking and normal operational wear is not covered.
Q5: How to get a quotation?
Provide the part number, purchase quantity and delivery address, our sales team will send a formal quotation within 24 hours.
Installation Guide
Completely shut down the dozer and disconnect battery power supply to guarantee operation safety.
Clean mounting flange, electrical terminals and connecting wiring thoroughly, remove dirt, oil sludge and debris.
Inspect new 123‑8686 electric starting motor assembly for housing deformation, pinion scratch or terminal damage before mounting.
Align motor flange with engine mounting seat correctly, connect battery cables and control wiring strictly following polarity requirements, fasten fixing bolts according to OEM torque specifications.
Reconnect battery, perform startup test, check cranking performance and observe abnormal noise during operation.
Maintenance Tips
Regularly inspect motor terminals, wiring harness and ground connection for looseness and oxidation in daily service.
Avoid long‑time continuous cranking operation to prevent over‑burning of internal coils and carbon‑brush accelerated wear.
Keep battery in good condition; ensure stable 24V power supply for starter service life extension.
When replacing starting motor assembly, inspect matched battery, cables and relay synchronously, renew worn supporting components.
