Guardian / Part reference

Guardian GUAT-301 sprocket and gear assembly

The 315 manual (4-14) calls GUAT-301 a sprocket and gear assembly; the 425 manual (9-17) calls it a shaft, and the 428 manual (03-21) calls it a shaft and gear assembly. The 315 assembly table requires replacement by a qualified technician. Keep the separate manual and October 2024 book scopes when selecting a part.

US source scopeUpdated 2026-09-15Independent Anderson reference

Match the whole number.

Manufacturer identifier: GUAT-301. Keep every character when comparing it with your label or paperwork. A similar number does not establish the same component.

Guardian 315 opener assembly parts, printed revision 4-14PDF page26 / printed page24, Opener Assembly Parts table item 1, exact part-number row · checked 2026-09-11 · GDO Manual Revised: 4-14 · Guardian
Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 5, row 2, column group 1; exact model heading 315; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 10, row 2, column group 1; exact model heading 415; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 15, row 2, column group 1; exact model heading 425; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 20, row 2, column group 1; exact model heading 428; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Guardian replacement-parts book, cover dated October 1, 2024DOCX embedded table word/media/image44.png, row 1; exact model heading 4250V; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Guardian replacement-parts book, cover dated October 1, 2024DOCX embedded table word/media/image47.png, row 1; exact model heading 4280V; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Guardian 415 manual parts referencePDF page 27 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 04-21; GDOMU10A-12 · Guardian
Guardian 425 manual parts referencePDF page 26 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian
Guardian 428 manual parts referencePDF page 26 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian

Values apply to the exact identifier and scope in the cited source.
Component function	sprocket and gear assembly View source and citation details Guardian 315 opener assembly parts, printed revision 4-14PDF page26 / printed page24, Opener Assembly Parts table item 1, exact part-number row · checked 2026-09-11 · GDO Manual Revised: 4-14 · Guardian
Exact manual scope	Guardian 315; printed cover revision GDO Manual Revised: 4-14. View source and citation details Guardian 315 opener assembly parts, printed revision 4-14PDF page26 / printed page24, Opener Assembly Parts table item 1, exact part-number row · checked 2026-09-11 · GDO Manual Revised: 4-14 · Guardian
Replacement requirement	Replacement by a qualified technician is required by this parts-table note. View source and citation details Guardian 315 opener assembly parts, printed revision 4-14PDF page26 / printed page24, Opener Assembly Parts table item 1, exact part-number row · checked 2026-09-11 · GDO Manual Revised: 4-14 · Guardian
Book description (observed model headings 315, 415; listing context only)	sprocket and gear assembly View source and citation details Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 5, row 2, column group 1; exact model heading 315; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Book description (observed model headings 425; listing context only)	shaft View source and citation details Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 15, row 2, column group 1; exact model heading 425; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Book description (observed model headings 428, 4250V, 4280V; listing context only)	shaft gear assembly View source and citation details Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 20, row 2, column group 1; exact model heading 428; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Source revision	Cover dated October 1, 2024 View source and citation details Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 5, row 2, column group 1; exact model heading 315; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
415 / 04-21; GDOMU10A-12: component function	sprocket and gear assembly View source and citation details Guardian 415 manual parts referencePDF page 27 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 04-21; GDOMU10A-12 · Guardian
415 / 04-21; GDOMU10A-12: applicability condition 1	Only the exact 415 manual edition 04-21 / GDOMU10A-12 is reviewed. No 415-3T, later edition, current stock or cross-model interchangeability is inferred. View source and citation details Guardian 415 manual parts referencePDF page 27 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 04-21; GDOMU10A-12 · Guardian
415 / 04-21; GDOMU10A-12: applicability condition 2	The assembly-parts table requires replacement by a qualified technician. View source and citation details Guardian 415 manual parts referencePDF page 27 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 04-21; GDOMU10A-12 · Guardian
425 / 9-17; GDOMU11A-5: component function	shaft View source and citation details Guardian 425 manual parts referencePDF page 26 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian
425 / 9-17; GDOMU11A-5: applicability condition 1	Only the exact 425 manual edition 9-17 / GDOMU11A-5 is reviewed. No later edition, current stock or cross-model interchangeability is inferred. View source and citation details Guardian 425 manual parts referencePDF page 26 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian
425 / 9-17; GDOMU11A-5: applicability condition 2	The assembly-parts table requires replacement by a qualified technician. View source and citation details Guardian 425 manual parts referencePDF page 26 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian
428 / 03-21; GDOMU16A-5: component function	shaft and gear assembly View source and citation details Guardian 428 manual parts referencePDF page 26 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian
428 / 03-21; GDOMU16A-5: applicability condition 1	Only the exact 428 manual edition 03-21 / GDOMU16A-5 is reviewed. No later edition, current stock or cross-model interchangeability is inferred. View source and citation details Guardian 428 manual parts referencePDF page 26 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian
428 / 03-21; GDOMU16A-5: applicability condition 2	The assembly-parts table requires replacement by a qualified technician. View source and citation details Guardian 428 manual parts referencePDF page 26 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian

Documented fitment & exclusions

Read the exact equipment or component, market, production and variant limits in every row. An omitted pairing has not been verified by this reference.

Source statements and their exact conditions. Use the checker below to compare equipment or a component.
Equipment or component / relationship	Evidence and conditions
415 Documented compatibility From GUAT-301 to 415.	Conditional Additional source conditions or an adapter must be checked before confirming compatibility. Details still needed source conditions Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified. GUAT-301 is listed directly under model 415 in the cover dated October 1, 2024 parts book; confirm source revision and exact configuration. Applies only within this source scope Market: US Model scope: 415 Exact model 415 listing in the replacement-parts book: Cover dated October 1, 2024. Confirm the exact part and installed configuration; a listing does not establish interchangeability with another revision, model or similarly named item. The source footnote for this assembly table requires replacement by a qualified technician. In the 415 manual (04-21; GDOMU10A-12): Only the exact 415 manual edition 04-21 / GDOMU10A-12 is reviewed. No 415-3T, later edition, current stock or cross-model interchangeability is inferred. The assembly-parts table requires replacement by a qualified technician. These requirements describe this manual edition only; they are not assigned to other source editions. Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 10, row 2, column group 1; exact model heading 415; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 10, row 2, column group 1; exact model heading 415; assembly item 1; qualified-technician footnote immediately following native assembly table 10 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian 415 manual parts referencePDF page 27 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 04-21; GDOMU10A-12 · Guardian Guardian 415 manual parts referencePDF page 1, exact model and revision on cover · checked 2026-09-12 · 04-21; GDOMU10A-12 · Guardian Guardian 415 manual parts referencePDF page 27 / printed page 25, qualified-technician replacement footnote below assembly table · checked 2026-09-12 · 04-21; GDOMU10A-12 · Guardian
425 Documented compatibility From GUAT-301 to 425.	Conditional Additional source conditions or an adapter must be checked before confirming compatibility. Details still needed source conditions Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified. GUAT-301 is listed directly under model 425 in the cover dated October 1, 2024 parts book; confirm source revision and exact configuration. Applies only within this source scope Market: US Model scope: 425 Exact model 425 listing in the replacement-parts book: Cover dated October 1, 2024. Confirm the exact part and installed configuration; a listing does not establish interchangeability with another revision, model or similarly named item. The source footnote for this assembly table requires replacement by a qualified technician. In the 425 manual (9-17; GDOMU11A-5): Only the exact 425 manual edition 9-17 / GDOMU11A-5 is reviewed. No later edition, current stock or cross-model interchangeability is inferred. The assembly-parts table requires replacement by a qualified technician. These requirements describe this manual edition only; they are not assigned to other source editions. Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 15, row 2, column group 1; exact model heading 425; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 15, row 2, column group 1; exact model heading 425; assembly item 1; qualified-technician footnote immediately following native assembly table 15 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian 425 manual parts referencePDF page 26 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian Guardian 425 manual parts referencePDF page 1, exact model and revision on cover · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian Guardian 425 manual parts referencePDF page 26 / printed page 25, qualified-technician replacement footnote below assembly table · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian
4250V Documented compatibility From GUAT-301 to 4250V.	Conditional Additional source conditions or an adapter must be checked before confirming compatibility. Details still needed source conditions Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified. GUAT-301 is listed directly under model 4250V in the cover dated October 1, 2024 parts book; confirm source revision and exact configuration. Applies only within this source scope Market: US Model scope: 4250V Exact model 4250V listing in the replacement-parts book: Cover dated October 1, 2024. Confirm the exact part and installed configuration; a listing does not establish interchangeability with another revision, model or similarly named item. Guardian replacement-parts book, cover dated October 1, 2024DOCX embedded table word/media/image44.png, row 1; exact model heading 4250V; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
428 Documented compatibility From GUAT-301 to 428.	Conditional Additional source conditions or an adapter must be checked before confirming compatibility. Details still needed source conditions Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified. GUAT-301 is listed directly under model 428 in the cover dated October 1, 2024 parts book; confirm source revision and exact configuration. Applies only within this source scope Market: US Model scope: 428 Exact model 428 listing in the replacement-parts book: Cover dated October 1, 2024. Confirm the exact part and installed configuration; a listing does not establish interchangeability with another revision, model or similarly named item. The source footnote for this assembly table requires replacement by a qualified technician. In the 428 manual (03-21; GDOMU16A-5): Only the exact 428 manual edition 03-21 / GDOMU16A-5 is reviewed. No later edition, current stock or cross-model interchangeability is inferred. The assembly-parts table requires replacement by a qualified technician. These requirements describe this manual edition only; they are not assigned to other source editions. Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 20, row 2, column group 1; exact model heading 428; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 20, row 2, column group 1; exact model heading 428; assembly item 1; qualified-technician footnote immediately following native assembly table 20 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian 428 manual parts referencePDF page 26 / printed page 25, assembly table item 1, exact part-number cell · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian Guardian 428 manual parts referencePDF page 1, exact model and revision on cover · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian Guardian 428 manual parts referencePDF page 26 / printed page 25, qualified-technician replacement footnote below assembly table · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian
4280V Documented compatibility From GUAT-301 to 4280V.	Conditional Additional source conditions or an adapter must be checked before confirming compatibility. Details still needed source conditions Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified. GUAT-301 is listed directly under model 4280V in the cover dated October 1, 2024 parts book; confirm source revision and exact configuration. Applies only within this source scope Market: US Model scope: 4280V Exact model 4280V listing in the replacement-parts book: Cover dated October 1, 2024. Confirm the exact part and installed configuration; a listing does not establish interchangeability with another revision, model or similarly named item. Guardian replacement-parts book, cover dated October 1, 2024DOCX embedded table word/media/image47.png, row 1; exact model heading 4280V; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
315 Documented compatibility From GUAT-301 to 315.	Conditional Additional source conditions or an adapter must be checked before confirming compatibility. Details still needed source conditions Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified. GUAT-301 is listed for the Guardian 315 opener assembly in the printed 4-14 manual; replacement requires a qualified technician. Applies only within this source scope Market: US Model scope: 315 Replacement by a qualified technician is required by this parts-table note. Scope is the Guardian 315 manual with printed cover revision GDO Manual Revised: 4-14; no current-stock, changed-revision or other-model fitment is established. Exact model 315 listing in the replacement-parts book: Cover dated October 1, 2024. Confirm the exact part and installed configuration; a listing does not establish interchangeability with another revision, model or similarly named item. The source footnote for this assembly table requires replacement by a qualified technician. Guardian 315 opener assembly parts, printed revision 4-14PDF page26 / printed page24, Opener Assembly Parts table item 1, exact part-number row · checked 2026-09-11 · GDO Manual Revised: 4-14 · Guardian Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 5, row 2, column group 1; exact model heading 315; assembly item 1 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 5, row 2, column group 1; exact model heading 315; assembly item 1; qualified-technician footnote immediately following native assembly table 5 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian

Direct replacement paths

No direct successor for GUAT-301 is verified in this reference.

A direct replacement statement does not establish reverse interchangeability, a kit equivalent or a later replacement chain.

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Part or accessory brand

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Part or accessory

Selected: GUAT-301 · Read its reference. Selection identifies a record; it does not confirm fitment.

Equipment or accessory brand

Choose the equipment or accessory brand separately from the component brand. A missing identifier is unverified. Use the model library to identify your equipment and its source documents.

An accessory pairing, including a receiver or wall console, applies only to the exact listed pair and source conditions. It does not establish suitability for your installed opener or compatibility through another device.

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Equipment market

Production date, if known

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Recall references

No recall reference is included for this identifier in the published dataset. This is not a safety clearance or proof that no recall exists.

Sources & scope

Guardian 315 opener assembly parts, printed revision 4-14Guardian · US · checked 2026-09-11 · GDO Manual Revised: 4-14
Guardian 415 manual parts referenceGuardian · US · checked 2026-09-12 · 04-21; GDOMU10A-12
Guardian 425 manual parts referenceGuardian · US · checked 2026-09-12 · 9-17; GDOMU11A-5
Guardian 428 manual parts referenceGuardian · US · checked 2026-09-12 · 03-21; GDOMU16A-5
Guardian replacement-parts book, cover dated October 1, 2024Guardian · US · checked 2026-09-12 · Cover dated October 1, 2024

Anderson prepared this reference from the listed evidence. Source statements are not an Anderson installation inspection or independent product test. Official documents stay on their publisher’s website.

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Use Guardian official support and match the complete part number, equipment model and production details with the source scope.

Use safely accessible labels and existing paperwork. Do not remove powered covers or adjust springs or cables to identify a component.

This is an independent Anderson reference. Manufacturer names identify the equipment and do not imply affiliation or authorized-dealer status.

A reference listing does not establish current stock, a price, eligibility for manufacturer support or that a component is faulty.