HYDRAULIC SYSTEM
CYLINDER GPTANK GP
HYDRAULIC SYSTEM
CYLINDER GP#SEBP44620200
270-9475: CYLINDER GP-BOOM
270-9475 CYLINDER GP-BOOM
95-MM (3.7-IN) BORE X 667-MM (26.3-IN) STROKE
PART OF 268-9973 LINES AR-BOOM
AN ATTACHMENT
95-MM (3.7-IN) BORE X 667-MM (26.3-IN) STROKE
PART OF 268-9973 LINES AR-BOOM
AN ATTACHMENT
Parts for your 304C CR MINI HYD EXCAVATOR:
CATERPILLAR SISPos. | Part No | Qty | Parts name | Comments |
---|---|---|---|---|
1. | 265-8726 | [2] | BUSHING | |
2. | 277-3414 | [1] | CYLINDER AS-BOOM | |
3. | 277-3415 | [1] | ROD AS | |
4. | 277-3379 | [1] | HEAD | |
5. | 277-3380 | [1] | RING | |
6. | 277-3381 J | [1] | SEAL | |
7. | 095-1713 J | [1] | SEAL-O-RING | |
8. | 277-3383 J | [1] | SEAL | |
9. | 277-3384 J | [1] | RING | |
10. | 277-3385 | [1] | BEARING | |
11. | 277-4933 J | [1] | RING | |
12. | 095-1712 J | [2] | SEAL-O-RING | |
13. | 277-3386 J | [2] | RING | |
14. | 277-3388 | [1] | PISTON | |
15. | 277-3389 J | [1] | RING | |
16. | 277-3390 J | [1] | RING | |
17. | 277-3391 | [1] | NUT | |
18. | 277-3392 J | [4] | SEAL | |
19. | 3B-8489 | [1] | FITTING-GREASE (1/8-27 PTF) | |
20. | 3B-8488 | [1] | FITTING-GREASE (1/8-27 PTF) | |
21. | 277-3393 | [1] | BEARING | |
22. | 277-3416 | [1] | TUBE AS | |
23. | 263-9891 J | [1] | SEAL-O-RING | |
24. | 277-3417 | [1] | U-BOLT | |
25. | 8T-4133 M | [2] | NUT (M10X1.5-THD) | |
26. | 8T-4121 | [2] | WASHER-HARD (11X21X2.5-MM THK) | |
AVAILABLE REPAIR KIT(S): | ||||
277-3395 J | [1] | KIT-SEAL (BOOM CYLINDER) | ||
J | KIT MARKED J SERVICES PART(S) MARKED J | |||
M | METRIC PART |
#SEBP44620201
282-8548: CYLINDER GP-BOOM
282-8548 CYLINDER GP-BOOM
95-MM (3.7-IN) BORE X 667-MM (26.3-IN) STROKE
PART OF 264-8415 BOOM AR
95-MM (3.7-IN) BORE X 667-MM (26.3-IN) STROKE
PART OF 264-8415 BOOM AR
Parts for your 304C CR MINI HYD EXCAVATOR:
CATERPILLAR SISPos. | Part No | Qty | Parts name | Comments |
---|---|---|---|---|
1. | 265-8726 | [2] | BUSHING | |
2. | 277-3377 | [1] | CYLINDER AS-BOOM | |
3. | 277-3415 | [1] | ROD AS | |
4. | 277-3379 | [1] | HEAD | |
5. | 277-3380 | [1] | RING | |
6. | 277-3381 J | [1] | SEAL | |
7. | 095-1713 J | [1] | SEAL-O-RING | |
8. | 277-3383 J | [1] | SEAL | |
9. | 277-3384 J | [1] | RING | |
10. | 277-3385 | [1] | BEARING | |
11. | 277-4933 | [1] | RING | |
12. | 095-1712 J | [2] | SEAL-O-RING | |
13. | 277-3386 J | [2] | RING | |
14. | 277-3388 | [1] | PISTON | |
15. | 277-3389 J | [1] | RING | |
16. | 277-3390 J | [1] | RING | |
17. | 277-3391 | [1] | NUT | |
18. | 277-3392 J | [4] | SEAL | |
19. | 3B-8488 | [1] | FITTING-GREASE (1/8-27 PTF) | |
20. | 3B-8489 | [1] | FITTING-GREASE (1/8-27 PTF) | |
21. | 283-2053 | [1] | BEARING | |
22. | 283-2054 | [1] | TUBE AS | |
23. | 263-9891 J | [1] | SEAL-O-RING | |
24. | 8T-4137 M | [1] | BOLT (M10X1.5X20-MM) | |
25. | 8T-4121 | [1] | WASHER-HARD (11X21X2.5-MM THK) | |
AVAILABLE REPAIR KIT(S): | ||||
277-3395 J | [1] | KIT-SEAL (BOOM CYLINDER) | ||
J | KIT MARKED J AVAILABLE FOR PARTS MARKED J | |||
M | METRIC PART |
#SEBP44620202
266-6969: CYLINDER GP-BUCKET
266-6969 CYLINDER GP-BUCKET
75-MM (3-IN) BORE X 646-MM (25.4-IN) STROKE
PART OF 266-3933, 270-6586 LINKAGE AR-BUCKET
AN ATTACHMENT
75-MM (3-IN) BORE X 646-MM (25.4-IN) STROKE
PART OF 266-3933, 270-6586 LINKAGE AR-BUCKET
AN ATTACHMENT
Parts for your 304C CR MINI HYD EXCAVATOR:
CATERPILLAR SISPos. | Part No | Qty | Parts name | Comments |
---|---|---|---|---|
1. | 265-8721 | [2] | BUSHING | |
2. | 277-4189 | [1] | CYLINDER AS | |
3. | 277-4159 | [1] | ROD AS | |
4. | 277-4160 | [1] | HEAD | |
5. | 250-8701 | [1] | RING-RETAINING | |
6. | 250-8702 J | [1] | SEAL-WIPER | |
7. | 095-1709 J | [1] | SEAL-O-RING | |
8. | 277-4161 J | [1] | SEAL | |
9. | 277-4162 J | [1] | RING | |
10. | 277-4163 | [1] | BEARING | |
11. | 250-8718 J | [1] | RING-BACKUP | |
12. | 095-1708 J | [1] | SEAL-O-RING | |
13. | 277-4164 | [1] | PISTON | |
14. | 250-8729 J | [1] | SEAL AS | |
15. | 250-8733 J | [1] | RING-WEAR | |
16. | 277-4165 | [1] | NUT | |
17. | 277-4134 J | [4] | SEAL | |
18. | 3B-8489 | [1] | FITTING-GREASE (1/8-27 PTF) | |
19. | 3B-8488 | [1] | FITTING-GREASE (1/8-27 PTF) | |
20. | 301-6906 | [1] | TUBE AS | |
21. | 8T-4121 | [1] | WASHER-HARD (11X21X2.5-MM THK) | |
22. | 8T-4137 M | [1] | BOLT (M10X1.5X20-MM) | |
23. | 263-9891 J | [1] | SEAL-O-RING | |
AVAILABLE REPAIR KIT(S): | ||||
277-4167 J | [1] | KIT-SEAL (BUCKET CYLINDER) | ||
J | KIT MARKED J SERVICES PART(S) MARKED J | |||
M | METRIC PART |
#SEBP44620203
282-8550: CYLINDER GP-STICK
282-8550 CYLINDER GP-STICK
85-MM (3.3-IN) BORE X 623-MM (24.5-IN) STROKE
PART OF 266-9545 STICK AR
85-MM (3.3-IN) BORE X 623-MM (24.5-IN) STROKE
PART OF 266-9545 STICK AR
Parts for your 304C CR MINI HYD EXCAVATOR:
CATERPILLAR SISPos. | Part No | Qty | Parts name | Comments |
---|---|---|---|---|
1. | 265-8721 | [2] | BUSHING | |
2. | 283-2105 | [1] | CYLINDER AS-STICK | |
3. | 277-4188 | [1] | ROD AS | |
4. | 277-4127 | [1] | HEAD | |
5. | 277-4128 | [1] | RING | |
6. | 277-4129 J | [1] | SEAL | |
7. | 277-4130 J | [1] | SEAL | |
8. | 095-1711 J | [1] | SEAL-O-RING | |
9. | 277-4131 J | [1] | RING | |
10. | 277-4132 | [1] | BEARING | |
11. | 263-9883 J | [1] | RING-BACKUP | |
12. | 095-1710 J | [1] | SEAL-O-RING | |
13. | 277-4133 | [1] | PISTON | |
14. | 263-9886 J | [1] | SEAL AS | |
15. | 263-9887 J | [1] | RING-WEAR | |
16. | 277-3391 | [1] | NUT | |
17. | 277-4134 J | [4] | SEAL | |
18. | 3B-8488 | [2] | FITTING-GREASE (1/8-27 PTF) | |
19. | 277-4135 | [1] | PLUG | |
20. | 095-1575 J | [1] | SEAL-O-RING | |
21. | 277-4138 | [25] | BALL | |
22. | 283-2106 | [1] | BEARING | |
AVAILABLE REPAIR KIT(S): | ||||
277-4140 J | [1] | KIT-SEAL (STICK CYLINDER) | ||
J | KIT MARKED J SERVICES PART(S) MARKED J |
#SEBP44620204
266-6975: CYLINDER GP-SWING BOOM
266-6975 CYLINDER GP-SWING BOOM
90-MM (3.54-IN) BORE X 591-MM (23.27-IN) STROKE
PART OF 264-8415 BOOM AR
90-MM (3.54-IN) BORE X 591-MM (23.27-IN) STROKE
PART OF 264-8415 BOOM AR
Parts for your 304C CR MINI HYD EXCAVATOR:
CATERPILLAR SISPos. | Part No | Qty | Parts name | Comments |
---|---|---|---|---|
1. | 265-8725 | [2] | BUSHING | |
2. | 272-5688 | [1] | CYLINDER AS | |
3. | 272-5689 | [1] | ROD AS | |
4. | 272-5659 | [1] | HEAD | |
5. | 193-1365 | [1] | PISTON | |
6. | 294-1867 | [1] | NUT (M36X4-THD) | |
7. | 193-1367 J | [2] | RING | |
8. | 193-1368 J | [1] | SEAL | |
9. | 272-5640 | [1] | RING | |
10. | 272-5664 | [1] | BEARING | |
11. | 272-5642 J | [1] | SEAL | |
12. | 272-5643 J | [1] | RING | |
13. | 272-5644 J | [1] | SEAL | |
14. | 095-1623 J | [1] | SEAL-O-RING | |
15. | 093-1513 J | [1] | RING-BACKUP | |
16. | 6V-7610 J | [1] | SEAL-O-RING | |
17. | 272-5645 | [4] | SEAL | |
18. | 3B-8489 | [1] | FITTING-GREASE (1/8-27 PTF) | |
19. | 3B-8486 | [1] | FITTING-GREASE (1/8-27 PTF) | |
AVAILABLE REPAIR KIT(S): | ||||
430-8918 J | [1] | KIT-HYD CYLINDER SEAL | ||
(INCLUDES RINGS & SEALS) | ||||
J | KIT MARKED J SERVICES PART(S) MARKED J |
#SEBP44620205
246-0192: CYLINDER GP-TILT
246-0192 CYLINDER GP-TILT -BUCKET
76-MM (3-IN) BORE X 120-MM (4.72-IN) STROKE
PART OF 274-9022 BUCKET AR-TILTABLE
AN ATTACHMENT
76-MM (3-IN) BORE X 120-MM (4.72-IN) STROKE
PART OF 274-9022 BUCKET AR-TILTABLE
AN ATTACHMENT
Parts for your 304C CR MINI HYD EXCAVATOR:
CATERPILLAR SISPos. | Part No | Qty | Parts name | Comments |
---|---|---|---|---|
1. | 1H-7339 | [1] | SEAL-O-RING | |
2. | 6E-0122 | [1] | HEAD | |
3. | 6J-1972 J | [1] | SEAL AS | |
4. | 6J-5733 J | [1] | RING-WEAR | |
5. | 9T-2212 | [1] | PISTON | |
6. | 167-2186 J | [1] | SEAL AS-BUFFER | |
7. | 167-2294 J | [1] | SEAL-U-CUP | |
8. | 226-8202 J | [1] | SEAL-WIPER | |
9. | 249-4175 | [1] | ROD AS | |
9T-4007 | [2] | BEARING | ||
10. | 4T-6780 J | [1] | RING-WEAR | |
11. | 5P-8250 | [1] | WASHER (28X49X5-MM THK) | |
12. | 6F-7037 | [1] | BOLT (1-14X3.25-IN) | |
13. | 8J-2574 J | [1] | RING-BACKUP | |
AVAILABLE REPAIR KIT(S): | ||||
235-0354 J | KIT-SEAL (HYDRAULIC CYLINDER)(BUCKET CYLINDER) | |||
(ALSO INCLUDES BACKUP RING & O-RING SEAL) | ||||
J | KIT MARKED J SERVICES PART(S) MARKED J |
#SEBP44620206
280-8530: DRAIN GP-ECOLOGY
280-8530 DRAIN GP-ECOLOGY -ENGINE, HYDRAULIC TANK
AN ATTACHMENT
AN ATTACHMENT
Parts for your 304C CR MINI HYD EXCAVATOR:
CATERPILLAR SIS#SEBP44620207
274-6502: DRAIN GP-OIL
274-6502 DRAIN GP-OIL -HYDRAULIC TANK
PART OF 280-8529 DRAIN GP-OIL
Type 1
AN ATTACHMENT
PART OF 280-8529 DRAIN GP-OIL
Type 1
AN ATTACHMENT
Parts for your 304C CR MINI HYD EXCAVATOR:
CATERPILLAR SISPos. | Part No | Qty | Parts name | Comments |
---|---|---|---|---|
1. | 274-6548 | [1] | CLAMP | |
2. | 285-6937 | [1] | BRACKET AS | |
3. | 285-6936 I | [1] | HOSE AS | |
4. | 148-8390 | [1] | ELBOW AS | |
2M-9780 | [1] | SEAL-O-RING | ||
6V-8626 | [1] | ELBOW | ||
7J-9108 | [1] | SEAL-O-RING | ||
5. | 165-4935 | [1] | PLUG AS | |
6V-9510 | [1] | PLUG | ||
7J-9108 | [1] | SEAL-O-RING | ||
6. | 6V-4298 M | [2] | BOLT (M5X0.8X16-MM) | |
7. | 8T-0328 | [2] | WASHER-HARD (5.5X10X1-MM THK) | |
8. | 8T-4121 | [2] | WASHER-HARD (11X21X2.5-MM THK) | |
9. | 8T-4136 M | [2] | BOLT (M10X1.5X25-MM) | |
10. | 7K-1181 | [1] | STRAP-CABLE | |
I | REFER TO HYDRAULIC INFORMATION SYSTEM | |||
M | METRIC PART |
#SEBP44620208
274-6502: DRAIN GP-OIL
274-6502 DRAIN GP-OIL -HYDRAULIC TANK
PART OF 280-8529 DRAIN GP-OIL
Type 2
AN ATTACHMENT
PART OF 280-8529 DRAIN GP-OIL
Type 2
AN ATTACHMENT
Parts for your 304C CR MINI HYD EXCAVATOR:
CATERPILLAR SISPos. | Part No | Qty | Parts name | Comments |
---|---|---|---|---|
1. | 274-6548 | [1] | CLAMP | |
2. | 285-6937 | [1] | BRACKET AS | |
3. | 285-6936 I | [1] | HOSE AS | |
4. | 148-8390 | [1] | ELBOW AS | |
2M-9780 | [1] | SEAL-O-RING | ||
6V-8626 | [1] | ELBOW | ||
7J-9108 | [1] | SEAL-O-RING | ||
5. | 165-4935 | [1] | PLUG AS | |
6V-9510 | [1] | PLUG | ||
7J-9108 | [1] | SEAL-O-RING | ||
6. | 7I-2273 M | [2] | BOLT (M5X0.8X16-MM) | |
7. | 7X-0620 C | [2] | WASHER-HARD (5.5X13X1.6-MM THK) | |
8. | 8T-4121 | [2] | WASHER-HARD (11X21X2.5-MM THK) | |
9. | 8T-4136 M | [2] | BOLT (M10X1.5X25-MM) | |
10. | 7K-1181 | [1] | STRAP-CABLE | |
C | CHANGE FROM PREVIOUS TYPE | |||
I | REFER TO HYDRAULIC INFORMATION SYSTEM | |||
M | METRIC PART |
#SEBP44620209
274-6502: DRAIN GP-OIL
274-6502 DRAIN GP-OIL -HYDRAULIC TANK
PART OF 280-8529 DRAIN GP-OIL
Type 3
AN ATTACHMENT
PART OF 280-8529 DRAIN GP-OIL
Type 3
AN ATTACHMENT
Parts for your 304C CR MINI HYD EXCAVATOR:
CATERPILLAR SISPos. | Part No | Qty | Parts name | Comments |
---|---|---|---|---|
1. | 4H-2558 C | [1] | GROMMET | |
2. | 353-2631 C | [1] | BRACKET AS | |
8T-3490 M | [2] | NUT-WELD (M10X1.5-THD) | ||
3. | 285-6936 I | [1] | HOSE AS | |
4. | 148-8390 | [1] | ELBOW AS | |
2M-9780 | [1] | SEAL-O-RING | ||
6V-8626 | [1] | ELBOW | ||
7J-9108 | [1] | SEAL-O-RING | ||
5. | 165-4935 | [1] | PLUG AS | |
6V-9510 | [1] | PLUG | ||
7J-9108 | [1] | SEAL-O-RING | ||
6. | 8T-4136 M | [2] | BOLT (M10X1.5X25-MM) | |
7. | 7K-1181 | [1] | STRAP-CABLE | |
8. | 8T-4121 | [2] | WASHER-HARD (11X21X2.5-MM THK) | |
C | CHANGE FROM PREVIOUS TYPE | |||
I | REFER TO HYDRAULIC INFORMATION SYSTEM | |||
M | METRIC PART |
Information:
HYDRAULIC SYSTEM
CYLINDER GP
Operation and Maintenance Manual
Swing Frame and Cylinder Bearings - Lubricate
303C CR, 303.5C CR, 304C CR and 305C CR Mini Hydraulic Excavators
303C CR, 303.5C CR, 304C CR and 305C CR Mini Hydraulic Excavators
Special Instruction
Instructions for Installation of Oversize Hydraulic Cylinder Seals {7555, 7562}
Instructions for Installation of Oversize Hydraulic Cylinder Seals {7555, 7562}
Instructions for Installation of Oversize Hydraulic Cylinder Seals {7555, 7562}
Procedure to Test the Position Sensor of a Hydraulic Cylinder {1439, 7562}
Procedure to Test the Position Sensor of a Hydraulic Cylinder {1439, 7562}
Procedure to Test the Position Sensor of a Hydraulic Cylinder {1439, 7562}
Technical Information Bulletin
Color Change for Cylinder Rod Seals (Wiper, U-Cup and Buffer){5100, 7555, 7562}
Color Change for Cylinder Rod Seals (Wiper, U-Cup and Buffer){5100, 7555, 7562}
Color Change for Cylinder Rod Seals (Wiper, U-Cup and Buffer){5100, 7555, 7562}
Specifications
Tool Operating Manual
Procedures for Using the 232-4686 Cylinder Washer Tank Group European Union Compliant{0374, 0599, 0680, 0738}
Procedures for Using the 232-4686 Cylinder Washer Tank Group European Union Compliant{0374, 0599, 0680, 0738}
Procedures for Using the 232-4686 Cylinder Washer Tank Group European Union Compliant{0374, 0599, 0680, 0738}
1U-9001 and 1U-9002 Automatic Hone Tooling{0599, 0677, 0738, 7562, 7562}
1U-9001 and 1U-9002 Automatic Hone Tooling{0599, 0677, 0738, 7562, 7562}
1U-9001 and 1U-9002 Automatic Hone Tooling{0599, 0677, 0738, 7562, 7562}
Model HCS-40 Hydraulic Cylinder Servicer{0374, 0599, 0700, 0738, 7562}
Model HCS-40 Hydraulic Cylinder Servicer{0374, 0599, 0700, 0738, 7562}
Model HCS-40 Hydraulic Cylinder Servicer{0374, 0599, 0700, 0738, 7562}
4C-9910 Portable Hydraulic Tester (Flow 125 GPM) {0599, 0784, 5050, 5057, 5095}
4C-9910 Portable Hydraulic Tester (Flow 125 GPM) {0599, 0784, 5050, 5057, 5095}
4C-9910 Portable Hydraulic Tester (Flow 125 GPM) {0599, 0784, 5050, 5057, 5095}
Using the 265-4177, 265-4209 Service Tool Groups to Install Sensors in Position-Sensing Hydraulic Cylinders{0599, 0709, 0738, 1439, 7562, 7562}
Using the 265-4177, 265-4209 Service Tool Groups to Install Sensors in Position-Sensing Hydraulic Cylinders{0599, 0709, 0738, 1439, 7562, 7562}
Using the 265-4177, 265-4209 Service Tool Groups to Install Sensors in Position-Sensing Hydraulic Cylinders{0599, 0709, 0738, 1439, 7562, 7562}
Using the 9U-7868 and 9U-7869 Spanner Wrench to Remove and install Threaded Gland Cylinder Heads{0374, 0599, 0602, 0738}
Using the 9U-7868 and 9U-7869 Spanner Wrench to Remove and install Threaded Gland Cylinder Heads{0374, 0599, 0602, 0738}
Using the 9U-7868 and 9U-7869 Spanner Wrench to Remove and install Threaded Gland Cylinder Heads{0374, 0599, 0602, 0738}
Procedures for Using the 120-9143 Cylinder Washer Tank Group {0374, 0602, 0680, 0738}
Procedures for Using the 120-9143 Cylinder Washer Tank Group {0374, 0602, 0680, 0738}
Procedures for Using the 120-9143 Cylinder Washer Tank Group {0374, 0602, 0680, 0738}
Systems Operation
Reuse And Salvage Guidelines
Testing Hydraulic Cylinders Using the <NOBR>188-3926</NOBR> Caterpillar Cylinder Tester and the <NOBR> 9U-6803</NOBR> Caterpillar Cylinder Tester {0784, 7562}
Testing Hydraulic Cylinders Using the188-3926 Caterpillar Cylinder Tester and the 9U-6803 Caterpillar Cylinder Tester {0784, 7562}
Testing Hydraulic Cylinders Using the
Hydraulic Cylinder Seal Failure Analysis {7555, 7562}
Hydraulic Cylinder Seal Failure Analysis {7555, 7562}
Hydraulic Cylinder Seal Failure Analysis {7555, 7562}
Inspection and Salvage of Hydraulic Cylinder Components {7562}
Inspection and Salvage of Hydraulic Cylinder Components {7562}
Inspection and Salvage of Hydraulic Cylinder Components {7562}
Measuring Bores and Installing Seals in Standard and Oversized Hydraulic Cylinders {5100, 7562}
Measuring Bores and Installing Seals in Standard and Oversized Hydraulic Cylinders {5100, 7562}
Measuring Bores and Installing Seals in Standard and Oversized Hydraulic Cylinders {5100, 7562}
Machining the O-ring Groove into the Face of Oversized Bolted Head Hydraulic Cylinders {0677, 5100, 7562}
Machining the O-ring Groove into the Face of Oversized Bolted Head Hydraulic Cylinders {0677, 5100, 7562}
Machining the O-ring Groove into the Face of Oversized Bolted Head Hydraulic Cylinders {0677, 5100, 7562}
HVOF Identification and Polishing (Superfinishing){0674, 0679, 1000, 7000, 7562}
HVOF Identification and Polishing (Superfinishing){0674, 0679, 1000, 7000, 7562}
HVOF Identification and Polishing (Superfinishing){0674, 0679, 1000, 7000, 7562}
Thermal Spray Procedures for Hydraulic Cylinder Rods{0679, 7562, 7562}
Thermal Spray Procedures for Hydraulic Cylinder Rods{0679, 7562, 7562}
Thermal Spray Procedures for Hydraulic Cylinder Rods{0679, 7562, 7562}
Contamination Control Guidelines
Applied Failure Analysis
Hydraulic Cylinder Seal Failure Analysis {7555, 7562}
Hydraulic Cylinder Seal Failure Analysis {7555, 7562}
Hydraulic Cylinder Seal Failure Analysis {7555, 7562}
Testing and Adjusting
Bench Test Procedures
Testing Hydraulic Cylinders Using the <NOBR>188-3926</NOBR> Caterpillar Cylinder Tester and the <NOBR> 9U-6803</NOBR> Caterpillar Cylinder Tester {0784, 7562}
Testing Hydraulic Cylinders Using the188-3926 Caterpillar Cylinder Tester and the 9U-6803 Caterpillar Cylinder Tester {0784, 7562}
Testing Hydraulic Cylinders Using the
Disassembly and Assembly
Service Magazine