Canon EF 75-300mm 1:4-5.6 III USM Parts Catalog

This document provides a comprehensive parts catalog and list for the Canon EF 75-300mm 1:4-5.6 III USM camera lens, identified by reference number C21-9862. It details individual components and their assembly within the lens structure.

Exploded View Diagrams

Page 1: Main Lens Assembly

This section illustrates the overall Canon EF 75-300mm 1:4-5.6 III USM lens. It shows the main lens barrel, zoom ring with focal length indicators (75mm, 100mm, 135mm, 200mm, 300mm), and the lens mount area. Key components depicted in exploded view include:

Mount Stopper Screw (CA2-4585-000)
Screws (CA2-4586-000 x2)
Mount Washer (CY1-2178-000(xxx))
Lens Mount (CY1-2180-000(xxx))
Back Cover (CY1-2458-000)
Screws (XA4-9200-606 x4)

A detailed view of component CY1-2178-000(xxx) is referenced, showing dimensions of 0.02 mm and 0.05 mm. A detailed view of component CY1-2180-000(xxx) is also referenced, showing various sizes from 2.0 mm to 2.7 mm.

Page 2: Rear Lens Assembly

This page focuses on the rear section of the lens, near the mount. It shows the lens mount (CY1-2180-000(xxx)) and associated screws (XA4-9200-606 x4). The back cover (CY1-2458-000) is also shown. Additional components include a mount washer (CY1-2178-000(xxx)) and its detailed view.

Page 3: Zoom and AF Mechanism Components

This section details parts related to the zoom and autofocus mechanisms. It includes the AF Drive Unit (CY1-2852-000), A/M Switch Assembly (CY1-2601-010), and the Zooming Scale Ring (CY1-2599-000). Other components shown are screws (XA4-4200-557 x2), a ring (YG9-2010), and parts labeled (CH1-0632) and (YA2-1219).

Page 4: Front Barrel Assembly

This page illustrates the front part of the lens barrel. Components shown include the Front Ring (CY1-2608-000), screws (XA4-9170-257, YA2-1218), and a barrel component (YG9-2008). Also depicted are lens groups/barrels (CY1-2453, CY1-2455, CY1-2456, CY1-2457) and associated screws and washers (YA2-0515 x2, YA2-0514).

Page 5: Internal Lens Groups and Components

This section provides a detailed exploded view of internal lens groups and barrels. Components include Lens G4.5 w/Barrel (CY1-2843-000), Lens G6/7 w/Frame (CY1-2455-000), Lens G8/9.10 w/Barrel (CY1-2456-000), and Lens G11.12/13 w/Barrel (CY1-2457-000). Also shown are the Power Diaphragm Unit (YG2-0246), AF Drive Unit (CY1-2852-000), and various screws, collars, and barrels such as XA4-9170-459 x3, XA1-7170-277 x2, YA2-1212, XA4-9170-309, YA2-0605 x2, XA4-6170-409 x2, X91-1436-870 x3, and CB2-0075-000(xxx) x3. A detailed view of CB2-0075-000(xxx) is referenced, showing dimensions of approximately 3.99 mm, 4.00 mm, and 4.01 mm.

Page 6: Further Internal Assemblies

This page continues the depiction of internal components. It shows a Ring, Front (CY1-2608-000), a Ring, Name (CY1-2853-000), and a Ring, Rubber (YA2-2303-000). Other components include a Ring, Reinforcement (YA2-2312-000), screws (YA2-2316 x3), a Washer, Dust Shield (YA2-2318-000), and a barrel assembly (CY1-2607-000) and housing (YA2-1200-050).

Page 7: Final Internal Components

This section illustrates the final internal assemblies. Components include barrels (YA2-1193, YA2-1192, YA2-1191-080), screws (YA2-0596 x3, XA1-6200-227 x2), a Key (YA2-1209), and a Z-FLX component (YH1-0190). The lens also features an Outer Helicoid (CY1-2607-000) and a Ring, Focusing (YA2-1200-050).

Parts List

NEW	PARTS NO.	CLASS	QTY	DESCRIPTION	PAGE
E	CA2-4585-000	E	1	SCREW, MOUNT STOPPER	1
E	CA2-4586-000	E	2	SCREW	1
E	CB2-0075-000(XXX)	E	6	COLLAR, FOCUSING	5
E	CH1-0632-000	E	1	M-FLX	2
E	CY1-2178-000(XXX)	E	1	WASHER, MOUNT	1
C	CY1-2180-000(XXX)	C	1	MOUNT, LENS	1
E	CY1-2453-000	E	1	LENS G1/2.3 W/BARREL	4
E	CY1-2455-000	E	1	LENS G6/7 W/FRAME	5
E	CY1-2456-000	E	1	LENS G8/9.10 W/BARREL	5
E	CY1-2457-000	E	1	LENS G11.12/13 W/BARREL	5
E	CY1-2458-000	E	1	COVER, BACK	1
C	CY1-2599-000	C	1	RING, ZOOMING SCALE	3
C	CY1-2601-010	C	1	A/M SWITCH ASS'Y	2
C	CY1-2607-000	C	1	OUTER HELICOID	6
C	CY1-2608-000	C	1	RING, FRONT	4
E	CY1-2843-000	E	1	LENS G4.5 W/BARREL	5
C	CY1-2852-000	C	1	AF DRIVE UNIT	2
C	CY1-2853-000	C	1	RING, NAME	6
6	X91-1436-870	6	SCREW, CROSS-RECESS, PH	5
2	XA1-6200-227	2	SCREW, CROSS-RECESS, PH	7
2	XA1-7170-277	2	SCREW, CROSS-RECESS, PH	5
1	XA1-7170-307	1	SCREW, CROSS-RECESS, PH	3
2	XA4-4200-557	2	SCREW, CROSS-RECESS, PH	2
3	XA4-6170-409	3	SCREW, CROSS-RECESS, PH	5
1	XA4-9170-257	1	SCREW, CROSS-RECESS, PH	3
1	XA4-9170-287	1	SCREW, CROSS-RECESS, PH	3
1	XA4-9170-309	1	SCREW, CROSS-RECESS, PH	5
3	XA4-9170-459	3	SCREW, CROSS-RECESS, PH	5
4	XA4-9200-606	4	SCREW, CROSS-RECESS, PH	1
E	YA2-0514-000	E	1	PIN	4
E	YA2-0515-000	E	2	PIN, ADJUSTING	4
D	YA2-0518-000	D	1	RUBBER, FRICTION	2
E	YA2-0585-000	E	1	STOPPER, KEY	3
3	YA2-0596-000	3	SCREW, CROSS-RECESS, PH	7
E	YA2-0597-000	E	1	WASHER, MOUNT	1
D	YA2-0605-000	D	3	COLLAR	5
E	YA2-1191-080	E	1	BARREL, FIXED	7
E	YA2-1192-000	E	1	BARREL, ZOOMING CAM	7
E	YA2-1193-000	E	1	INNER HELICOID	7
E	YA2-1200-050	E	1	RING, FOCUSING	6
E	YA2-1209-000	E	1	KEY	7
E	YA2-1212-000	E	1	HOLDER, EMD-FLX	5
E	YA2-1214-000	E	1	SHIELD, DUST	3
D	YA2-1218-000	D	1	BRUSH, FOCUSING	3
D	YA2-1219-000	D	1	CONTACT ASS'Y	2
C	YA2-2303-000	C	1	RING, RUBBER	3
D	YA2-2312-000	D	1	RING, REINFORCEMENT	6
3	YA2-2316-000	3	SCREW, CROSS-RECESS, PH	4
C	YA2-2318-000	C	2	WASHER, DUST SHIELD	6
D	YF2-0036-000	D	1	BRUSH, ZOOMING	3
E	YF2-0044-000	E	3	KEY	7
C	YG2-0246-000	C	1	POWER DIAPHRAGM UNIT	5
C	YG9-2008-000	C	1	RING, ZOOM	3
C	YG9-2009-000	C	1	RING, INDEX	2
C	YG9-2010-000	C	1	PCB ASS'Y, MAIN	2
D	YH1-0190-000	D	1	Z-FLX	7

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