Part-number relationships
| Relationship | Reference family | Number |
|---|---|---|
| Primary Cat Part Number | Official control-group identity | 521-0783 |
| Same-number Formatting Variant | Search alias only | 5210783 |
ECM Controllers & Monitors
521-0783 Control Group for Cat 336 340 345 GC 350 C9.3B
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OEM / reference521-0783
SpecificationElectronic Control Group / ECM
Catalog ID53589453
Electronic control group identified by official Cat part number 521-0783. The manufacturer compatible-model record includes 336, 340, 345 GC and 350 excavators, the 336MHPU mobile hydraulic power unit, D6 and D7 tractors, C9.3B industrial engines and additional listed equipment. The selected owned photograph has a readable 521-0783 manufacturer label.
- Product Type
- Electronic Control Group / ECM
- Condition
- New replacement component
Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.
Product fitment guide
Part numbers and compatible models
Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.
Part identification
Reference numbers
Primary number
Formatting alias
Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.
Product summary
Electronic Control Group / ECM
- Category
- ECM Controllers & Monitors
- Catalog ID
- 53589453
- Photo views
- 1
Before ordering
Confirm these details
- Match the complete part number on the original component label.
- Compare the front layout and visible configuration with the product photos.
- Compare connector count, connector shape and keying before installation.
- Confirm the exact machine model and serial range before ordering.
Machine fitment
Compatible model references
6 model references
Compatibility lists identify searchable model families, not every production serial range. Confirm the original part number and machine serial number before purchase.
Quick fitment answers
Common questions about 521-0783
Which machines use 521-0783?
Recorded compatible model references include Official Cat Excavators: 336 / 340 / 345 GC / 350, Official Cat Mobile Hydraulic Power Unit: 336MHPU, Official Cat Track-Type Tractors: D6 / D7, Official Cat Industrial Engine: C9.3B, Other official equipment: RM400 / 521 / 522 / 973 / 973K / PM310 / PM312 / PM313 / 966 / 966 GC / 972, Fitment limitation: Confirm 521-0783, software/calibration, connector keying, machine serial and configuration before shipment. Confirm the complete part number and machine serial range before ordering.
What numbers are documented for 521-0783?
Formatting aliases for the same number: 5210783.
How do I confirm 521-0783 before ordering?
Match the complete part number on the original component label. Compare the front layout and visible configuration with the product photos. Compare connector count, connector shape and keying before installation. Send clear photos of the original unit and connector layout when requesting a quote.
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