Audible noise is evidence to investigate, but fault location depends on whether the sound tracks speed, torque or the machine structure.
Helical Gearbox Noise Diagnosis by Speed and Load
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The ZC300SS ZC Series Stainless Steel Hollow Pin Chain features the following specifications:

| Chain No. | Minimum Breaking Load,Ibf | Pitch Inches | Pitch(mm) | E | C2 | D3 | F | A1 | G | I | H | T1 | T2 | J1 | J2 | Breaking(load kN) | Mass (Type C) (kg/m) |
| ZC21SS | 4500 | 1.5 | 38.1 | 12.7 | 25.4 | 11 | 9 | 6.5 | 18 | 2.5 | 2.5 | 26 | 14.5 | 14.7 | 2.2 | ||
| ZC21SS | 4500 | 2 | 50.8 | 12.7 | 25.4 | / | 11 | 9 | 6.5 | 18 | 2.5 | 2.5 | 26 | 14.5 | 14.7 | 1.7 | |
| ZC21SS | 4500 | 2.5 | 63.5 | 12.7 | 25.4 | / | 11 | 9 | 6.5 | 18 | 2.5 | 2.5 | 26 | 14.5 | 14.7 | 1.6 | |
| ZC21SS | 4500 | 3 | 76.2 | 12.7 | 25.4 | / | / | 11 | 9 | 6.5 | 18 | 2.5 | 2.5 | 26 | 14.5 | 14.7 | 1.4 |
| ZC40SS | 6000 | 2 | 50.8 | 15 | 31.75 | 40 | 2.5 | 17 | 14 | 10.2 | 25 | 4 | 4 | 36.4 | 19.5 | 28 | 3.6 |
| ZC40SS | 6000 | 2.5 | 63.5 | 15 | 31.75 | 40 | 2.5 | 17 | 14 | 10.2 | 25 | 4 | 4 | 36.4 | 19.5 | 28 | 3.2 |
| ZC40SS | 6000 | 3 | 76.2 | 15 | 31.75 | 40 | 2.5 | 17 | 14 | 10.2 | 25 | 4 | 4 | 36.4 | 19.5 | 28 | 3 |
| ZC40SS | 6000 | 3.5 | 88.9 | 15 | 31.75 | 40 | 2.5 | 17 | 14 | 10.2 | 25 | 4 | 4 | 36.4 | 19.5 | 28 | 2.8 |
| 7C40SS | 6000 | 4 | 101.6 | 15 | 31.75 | 40 | 2.5 | 17 | 14 | 10.2 | 25 | 4 | 4 | 36.4 | 19.5 | 28 | 2.6 |
| ZC40SS | 6000 | 5 | 127 | 15 | 31.75 | 40 | 2.5 | 17 | 14 | 10.2 | 25 | 4 | 4 | 36.4 | 19.5 | 28 | 2.4 |
| ZC40SS | 6000 | 6 | 152.4 | 15 | 31.75 | 40 | 2.5 | 17 | 14 | 10.2 | 25 | 4 | 4 | 36.4 | 19.5 | 28 | 2.3 |
| ZC60SS | 12000 | 3 | 76.2 | 19 | 47.5 | 60 | 3.5 | 23 | 19 | 13.2 | 40 | 5 | 4 | 45 | 23.5 | 42 | 7 |
| ZC60SS | 12000 | 3.5 | 88.9 | 19 | 47.5 | 60 | 3.5 | 23 | 19 | 13.2 | 40 | 5 | 4 | 45 | 23.5 | 42 | 6.4 |
| ZC60SS | 12000 | 4 | 101.6 | 19 | 47.5 | 60 | 3.5 | 23 | 19 | 13.2 | 40 | 5 | 4 | 45 | 23.5 | 42 | 6 |
| ZC60SS | 12000 | 5 | 127 | 19 | 47.5 | 60 | 3.5 | 23 | 19 | 13.2 | 40 | 5 | 4 | 45 | 23.5 | 42 | 5.3 |
| ZC60SS | 12000 | 6 | 152.4 | 19 | 47.5 | 60 | 3.5 | 23 | 19 | 13.2 | 40 | 5 | 4 | 45 | 23.5 | 42 | 4.9 |
| ZC60SS | 12000 | 7 | 177.8 | 19 | 47.5 | 60 | 3.5 | 23 | 19 | 13.2 | 40 | 5 | 4 | 45 | 23.5 | 42 | 4.6 |
| ZC60SS | 12000 | 8 | 203.2 | 19 | 47.5 | 60 | 3.5 | 23 | 19 | 13.2 | 40 | 5 | 4 | 45 | 23.5 | 42 | 4.4 |
| ZC150SS | 24000 | 4 | 101.6 | 26 | 66.7 | 82 | 4 | 33 | 26.9 | 20.2 | 50 | 7 | 5 | 58 | 31.5 | 105 | 12.8 |
| ZC150SS | 24000 | 5 | 127 | 26 | 66.7 | 82 | 4 | 33 | 26.9 | 20.2 | 50 | 7 | 5 | 58 | 31.5 | 105 | 11.3 |
| ZC150SS | 24000 | 6 | 152.4 | 26 | 66.7 | 82 | 4 | 33 | 26.9 | 20.2 | 50 | 7 | 5 | 58 | 31.5 | 105 | 11 |
| ZC150SS | 24000 | 7 | 177.8 | 26 | 66.7 | 82 | 4 | 33 | 26.9 | 20.2 | 50 | 5 | 58 | 31.5 | 105 | 9.5 | |
| ZC150SS | 24000 | 8 | 203.2 | 26 | 66.7 | 82 | 4 | 33 | 26.9 | 20.2 | 50 | 7 | 5 | 58 | 31.5 | 105 | 9 |
| ZC150SS | 24000 | 9 | 228.6 | 26 | 66.7 | 82 | 4 | 33 | 26.9 | 20.2 | 50 | 7 | 5 | 58 | 31.5 | 105 | 8.6 |
| ZC150SS | 24000 | 10 | 254 | 26 | 66.7 | 82 | 4 | 33 | 26.9 | 20.2 | 50 | 7 | 5 | 58 | 31.5 | 105 | 8.2 |
| ZC300SS | 36000 | 6 | 152.4 | 38 | 88.9 | 114 | 8.5 | 38 | 32 | 22.5 | 60 | 10 | 8 | 83 | 43.5 | 210 | 22.3 |
| ZC300SS | 36000 | 7 | 177.8 | 38 | 88.9 | 114 | 8.5 | 38 | Additional information
Blogs UpdatedHelical Gearbox Noise Diagnosis by Speed and LoadAudible noise is evidence to investigate, but fault location depends on whether the sound tracks speed, torque or the machine structure. Coupling Alignment for Inline Helical Gearbox InstallationsFlexible couplings accommodate limited relative movement, but poor shaft alignment still affects bearings and seals. Helical Gearbox Oil Leak Diagnosis and Seal ProtectionOil observed on a housing may have traveled from a vent, joint or shaft seal; finding the first wet point is essential. |