Alternators

Caterpillar 121-4135 Alternator for AP-1000 AP-1050 3116

Q: What numbers are documented for 121-4135?

Primary Part Number: 121-4135. Related reference - verify configuration: 321-674. Related reference - verify configuration: 321-682. Related reference - verify configuration: 321-683. Related reference - verify configuration: 321-685. Related reference - verify configuration: 321-686. Related reference - verify configuration: 321-687. Related reference - verify configuration: 321-688. Related reference - verify configuration: 71370306. Related reference - verify configuration: ADR0046. Related reference - verify configuration: BAL9960LH. Related reference - verify configuration: MG490. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 121-4135 before ordering?

Match the complete part number, compare the connector or mounting arrangement with your original unit and the recorded specifications, and confirm the machine or engine model and serial range. Send clear photos of the original unit when requesting a quote.

EexcavaStart packaging illustration · Not a photograph of this exact part. Exact-unit photo availability is not confirmed; send your original part number and unit photos with your inquiry.

OEM / reference121-4135

SpecificationAlternator

Catalog ID91000727

Product Type: Alternator
Supply Brand: EexcavaStart
Equipment Brand: Caterpillar
Catalog Classification: Alternator Gp -B
Application Records: 3
Condition: New replacement part
Gallery Representation: EexcavaStart neutral packaging illustration; actual product photograph pending
Reference limitation: Confirm original-unit ratings, mounting, connections and equipment serial range; related numbers do not guarantee universal interchange.

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Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.

Quotation details: MOQ, availability, lead time, item condition (new or remanufactured) and warranty coverage must be confirmed in your quotation before ordering.

Part-number relationships

Relationship	Reference family	Number
Primary Part Number	Product reference; supplied-unit verification pending	121-4135
Cross-reference (fitment check required)	AC DELCO	321-674
Cross-reference (fitment check required)	AC DELCO	321-682
Cross-reference (fitment check required)	AC DELCO	321-683
Cross-reference (fitment check required)	AC DELCO	321-685
Cross-reference (fitment check required)	AC DELCO	321-686
Cross-reference (fitment check required)	AC DELCO	321-687
Cross-reference (fitment check required)	AC DELCO	321-688
Cross-reference (fitment check required)	AGCO	71370306
Cross-reference (fitment check required)	ARROWHEAD	ADR0046
Cross-reference (fitment check required)	ARROWHEAD	BAL9960LH
Cross-reference (fitment check required)	ARROWHEAD	MG490
Cross-reference (fitment check required)	ARROWHEAD	IA1058
Cross-reference (fitment check required)	CARGO	111232
Cross-reference (fitment check required)	CARGO	112995
Cross-reference (fitment check required)	CARGO	112996
Cross-reference (fitment check required)	CARGO	113432
Cross-reference (fitment check required)	CATERPILLAR	0R9480
Cross-reference (fitment check required)	CATERPILLAR	117-1379
Cross-reference (fitment check required)	CATERPILLAR	121-4134
Cross-reference (fitment check required)	CATERPILLAR	3E8827
Cross-reference (fitment check required)	CATERPILLAR	9X9096
Cross-reference (fitment check required)	CUMMINS	3604667RX
Cross-reference (fitment check required)	CUMMINS	3604668RX
Cross-reference (fitment check required)	CUMMINS	3675158RX
Cross-reference (fitment check required)	CUMMINS	3920615
Cross-reference (fitment check required)	DELCO	10459013
Cross-reference (fitment check required)	DELCO	10459017
Cross-reference (fitment check required)	DELCO	10459037
Cross-reference (fitment check required)	DELCO	10459047
Cross-reference (fitment check required)	DELCO	10459050
Cross-reference (fitment check required)	DELCO	10459051
Cross-reference (fitment check required)	DELCO	10459336
Cross-reference (fitment check required)	DELCO	1117885
Cross-reference (fitment check required)	DELCO	1117886
Cross-reference (fitment check required)	DELCO	1117887
Cross-reference (fitment check required)	DELCO	1117890
Cross-reference (fitment check required)	DELCO	1117891
Cross-reference (fitment check required)	DELCO	1117892
Cross-reference (fitment check required)	DELCO	1117905
Cross-reference (fitment check required)	DELCO	1117909
Cross-reference (fitment check required)	DELCO	1117910
Cross-reference (fitment check required)	DELCO	1117918
Cross-reference (fitment check required)	DELCO	1117920
Cross-reference (fitment check required)	DELCO	1117922
Cross-reference (fitment check required)	DELCO	1117923
Cross-reference (fitment check required)	DELCO	1117934
Cross-reference (fitment check required)	DELCO	1117937
Cross-reference (fitment check required)	DELCO	1117943
Cross-reference (fitment check required)	DELCO	1117961
Cross-reference (fitment check required)	DELCO	1117963
Cross-reference (fitment check required)	DELCO	1117964
Cross-reference (fitment check required)	DELCO	1117965
Cross-reference (fitment check required)	DELCO	1117966
Cross-reference (fitment check required)	DELCO	19010101
Cross-reference (fitment check required)	DELCO	19010103
Cross-reference (fitment check required)	DELCO	19010104
Cross-reference (fitment check required)	DELCO	19010105
Cross-reference (fitment check required)	DELCO	19010114
Cross-reference (fitment check required)	DELCO	19010115
Cross-reference (fitment check required)	DELCO	19010126
Cross-reference (fitment check required)	DELCO	19010127
Cross-reference (fitment check required)	DELCO	19010129
Cross-reference (fitment check required)	DELCO	19010141
Cross-reference (fitment check required)	DELCO	19010145
Cross-reference (fitment check required)	DELCO	19010147
Cross-reference (fitment check required)	DELCO	19010168
Cross-reference (fitment check required)	DELCO	19010181
Cross-reference (fitment check required)	DELCO	19010192
Cross-reference (fitment check required)	DELCO	19010196
Cross-reference (fitment check required)	INTL HARVESTER	1677975C91
Cross-reference (fitment check required)	J&N Electrical Products	400-12072
Cross-reference (fitment check required)	J&N Electrical Products	400-12072R
Cross-reference (fitment check required)	J&N Electrical Products	400-12074R
Cross-reference (fitment check required)	J&N Electrical Products	400-12082
Cross-reference (fitment check required)	J&N Electrical Products	400-12266
Cross-reference (fitment check required)	J&N Electrical Products	400-12082R
Cross-reference (fitment check required)	John Deere	AT142246
Cross-reference (fitment check required)	John Deere	TY6753
Cross-reference (fitment check required)	LESTER	7641
Cross-reference (fitment check required)	LESTER	7660
Cross-reference (fitment check required)	LESTER	7662
Cross-reference (fitment check required)	LESTER	7663
Cross-reference (fitment check required)	LESTER	7664
Cross-reference (fitment check required)	LESTER	7668
Cross-reference (fitment check required)	LESTER	7673
Cross-reference (fitment check required)	LESTER	7679
Cross-reference (fitment check required)	LESTER	7680
Cross-reference (fitment check required)	LESTER	7681
Cross-reference (fitment check required)	LESTER	7685
Cross-reference (fitment check required)	LESTER	7686
Cross-reference (fitment check required)	LESTER	8016
Cross-reference (fitment check required)	LESTER	8017
Cross-reference (fitment check required)	LESTER	8018
Cross-reference (fitment check required)	LESTER	8019
Cross-reference (fitment check required)	LESTER	8022
Cross-reference (fitment check required)	LESTER	8023
Cross-reference (fitment check required)	LESTER	8025
Cross-reference (fitment check required)	LESTER	8031
Cross-reference (fitment check required)	LESTER	M20149
Cross-reference (fitment check required)	LESTER	M20154
Cross-reference (fitment check required)	LETRIKA (ISKRA) AFTERMARKET	IA 1058
Cross-reference (fitment check required)	MAHLE	MG490
Cross-reference (fitment check required)	NEW HOLLAND	9824834
Cross-reference (fitment check required)	REGITAR-USA	A240-848N
Cross-reference (fitment check required)	REGITAR-USA	A240-859N
Cross-reference (fitment check required)	REGITAR-USA	A240-861N
Cross-reference (fitment check required)	REMY LIGHT DUTY	51211
Cross-reference (fitment check required)	REMY LIGHT DUTY	51215
Cross-reference (fitment check required)	REMY LIGHT DUTY	51217
Cross-reference (fitment check required)	REMY LIGHT DUTY	53103
Cross-reference (fitment check required)	REMY LIGHT DUTY	53104
Cross-reference (fitment check required)	REMY LIGHT DUTY	53169
Cross-reference (fitment check required)	WAI	7681N
Cross-reference (fitment check required)	WAI	7685N

Product fitment guide

Part numbers and compatible models

Quickly compare the reference number and recorded machine applications. Use photos of your original unit and the checklist before ordering.

Part identification

Reference numbers

Primary number

121-4135

Cross-reference (fitment check required)

321-674
321-682
321-683
321-685
321-686
321-687
321-688
71370306
ADR0046
BAL9960LH
MG490
IA1058
111232
112995
112996
113432
0R9480
117-1379
121-4134
3E8827
9X9096
3604667RX
3604668RX
3675158RX
3920615
10459013
10459017
10459037
10459047
10459050
10459051
10459336
1117885
1117886
1117887
1117890
1117891
1117892
1117905
1117909
1117910
1117918
1117920
1117922
1117923
1117934
1117937
1117943
1117961
1117963
1117964
1117965
1117966
19010101
19010103
19010104
19010105
19010114
19010115
19010126
19010127
19010129
19010141
19010145
19010147
19010168
19010181
19010192
19010196
1677975C91
400-12072
400-12072R
400-12074R
400-12082
400-12266
400-12082R
AT142246
TY6753
7641
7660
7662
7663
7664
7668
7673
7679
7680
7681
7685
7686
8016
8017
8018
8019
8022
8023
8025
8031
M20149
M20154
IA 1058
9824834
A240-848N
A240-859N
A240-861N
51211
51215
51217
53103
53104
53169
7681N
7685N

Formatting aliases are the same number written differently. Cross-references require a specification and fitment check; they do not by themselves confirm direct interchangeability. Related assemblies and remanufactured numbers are separate relationship types.

Product summary

Alternator

Category: Alternators
Catalog ID: 91000727
Illustration views: 1

Before ordering

Confirm these details

Confirm voltage and rated amperage against the original alternator label.
Compare mounting ears, pulley type and pulley-groove count.
Check plug shape, terminal position and regulator connection.
Verify the engine model and machine serial range before ordering.

Machine fitment

Compatible model references

2 model references

Machine models: AP-1000 / AP-1050
Engine models: 3116

Fitment / evidence notes

Fitment limitation: Confirm the exact part number, electrical rating, terminal layout, mounting and machine serial range before shipment

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 121-4135

Which machines use 121-4135?

Recorded compatible model references include Machine models: AP-1000 / AP-1050, Engine models: 3116. Recorded fitment/evidence notes: Fitment limitation: Confirm the exact part number, electrical rating, terminal layout, mounting and machine serial range before shipment. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 121-4135?

Cross-references are listed in the relationship table above. Compare specifications and the original unit before treating a reference as interchangeable.

How do I confirm 121-4135 before ordering?

Confirm voltage and rated amperage against the original alternator label. Compare mounting ears, pulley type and pulley-groove count. Check plug shape, terminal position and regulator connection. Send clear photos of the original unit and connector layout when requesting a quote.