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Chiaravalli CH-G A 903 helical gear unit (chiaravalli.com product image)
Chiaravalli

CH-G A 903 Helical Gear Unit (Ø90 mm output shaft)

Cast Iron Gearboxes CH-G

CH-G A 903 helical in-line gear unit — Chiaravalli's cast iron series: three-stage, size 90, ratios 48.5:1 to 205.73:1. This is the A … / PAM version — foot mounting with the PAM motor input — the version the catalogue lists as available from stock. Solid keyed output shaft Ø90 m6. The flange-mounted F and foot-flange AF versions, the W input-shaft and IEC-coupling input versions and the FA–FD output flanges are made to order — ask us. PAM motor input for IEC 132, 160, 180, 200 motors.

Supplied without motor. You are choosing the gear unit with its PAM motor adapter — ask us to quote a suitable motor together with it if you'd like both.

How to pick from the table: with a standard 4-pole motor (1400 r/min) the ratio sets the output speed — e.g. ratio 205.73:1 gives 7 r/min at the output shaft. Each row shows the catalogue's maximum output torque (M2max at service factor 1) and the largest 4-pole motor that reaches it (P1max, 5.7 to 24.18 kW on this size). Choose the row whose output speed and torque match your application, then the flange that matches your motor (the frame size is on the motor's nameplate — only the frames the catalogue lists for that ratio are offered). The Motor column lists the 4-pole motors that fit that flange — pick yours and the output torque and service factor update to match. FR1 / FR2 are the permissible radial loads on the input and output shafts. More in the Selection Guide tab below.

Mounting position M1 is standard — specify yours when ordering (see the mounting-positions image). Cast iron housing.

Product Configuration

Select a row to add it to your quote

Code RatioMotor flangeMotorOutput speedOutput torqueService factorRadial load FR1Radial load FR2 Weight
CH-G A903 205.73 PAM132 205.73:1 IEC 132 · 38 mm shaft 5.5 kW 6.8 r/min 7719 Nm 1.04 8 kN 55 kN 182.0 kg
CH-G A903 205.73 PAM160 205.73:1 IEC 160 · 42 mm shaft 11 kW 6.8 r/min 15439 Nm 0.52 8 kN 55 kN 190.0 kg
CH-G A903 205.73 PAM180 205.73:1 IEC 180 · 48 mm shaft 18.5 kW 6.8 r/min 25965 Nm 0.31 8 kN 55 kN 190.0 kg
CH-G A903 185.64 PAM132 185.64:1 IEC 132 · 38 mm shaft 5.5 kW 7.5 r/min 6962 Nm 1.15 8 kN 55 kN 182.0 kg
CH-G A903 185.64 PAM160 185.64:1 IEC 160 · 42 mm shaft 11 kW 7.5 r/min 13924 Nm 0.57 8 kN 55 kN 190.0 kg
CH-G A903 185.64 PAM180 185.64:1 IEC 180 · 48 mm shaft 18.5 kW 7.5 r/min 23418 Nm 0.34 8 kN 55 kN 190.0 kg
CH-G A903 154.07 PAM132 154.07:1 IEC 132 · 38 mm shaft 7.5 kW 9.1 r/min 7884 Nm 1.01 8 kN 55 kN 182.0 kg
CH-G A903 154.07 PAM160 154.07:1 IEC 160 · 42 mm shaft 11 kW 9.1 r/min 11564 Nm 0.69 8 kN 55 kN 190.0 kg
CH-G A903 154.07 PAM180 154.07:1 IEC 180 · 48 mm shaft 18.5 kW 9.1 r/min 19448 Nm 0.41 8 kN 55 kN 190.0 kg
CH-G A903 139.41 PAM132 139.41:1 IEC 132 · 38 mm shaft 7.5 kW 10 r/min 7134 Nm 1.12 8 kN 55 kN 182.0 kg
CH-G A903 139.41 PAM160 139.41:1 IEC 160 · 42 mm shaft 11 kW 10 r/min 10464 Nm 0.76 8 kN 55 kN 190.0 kg
CH-G A903 139.41 PAM180 139.41:1 IEC 180 · 48 mm shaft 18.5 kW 10 r/min 17598 Nm 0.45 8 kN 55 kN 190.0 kg
CH-G A903 128.36 PAM132 128.36:1 IEC 132 · 38 mm shaft 7.5 kW 10.9 r/min 6565 Nm 1.22 8 kN 55 kN 182.0 kg
CH-G A903 128.36 PAM160 128.36:1 IEC 160 · 42 mm shaft 11 kW 10.9 r/min 9628 Nm 0.83 8 kN 55 kN 190.0 kg
CH-G A903 128.36 PAM180 128.36:1 IEC 180 · 48 mm shaft 18.5 kW 10.9 r/min 16193 Nm 0.49 8 kN 55 kN 190.0 kg
CH-G A903 128.36 PAM200 128.36:1 IEC 200 · 55 mm shaft 30 kW 10.9 r/min 26258 Nm 0.3 8 kN 55 kN 205.0 kg
CH-G A903 115.83 PAM132 115.83:1 IEC 132 · 38 mm shaft 7.5 kW 12.1 r/min 5923 Nm 1.35 8 kN 55 kN 182.0 kg
CH-G A903 115.83 PAM160 115.83:1 IEC 160 · 42 mm shaft 11 kW 12.1 r/min 8687 Nm 0.92 8 kN 55 kN 190.0 kg
CH-G A903 115.83 PAM180 115.83:1 IEC 180 · 48 mm shaft 18.5 kW 12.1 r/min 14610 Nm 0.55 8 kN 55 kN 190.0 kg
CH-G A903 115.83 PAM200 115.83:1 IEC 200 · 55 mm shaft 30 kW 12.1 r/min 23692 Nm 0.34 8 kN 55 kN 205.0 kg
CH-G A903 104.41 PAM132 104.41:1 IEC 132 · 38 mm shaft 7.5 kW 13.4 r/min 5343 Nm 1.5 8 kN 55 kN 182.0 kg
CH-G A903 104.41 PAM160 104.41:1 IEC 160 · 42 mm shaft 11 kW 13.4 r/min 7836 Nm 1.02 8 kN 55 kN 190.0 kg
CH-G A903 104.41 PAM180 104.41:1 IEC 180 · 48 mm shaft 18.5 kW 13.4 r/min 13179 Nm 0.61 8 kN 55 kN 190.0 kg
CH-G A903 96.13 PAM132 96.13:1 IEC 132 · 38 mm shaft 7.5 kW 14.6 r/min 4918 Nm 1.63 8 kN 55 kN 182.0 kg
CH-G A903 96.13 PAM160 96.13:1 IEC 160 · 42 mm shaft 11 kW 14.6 r/min 7213 Nm 1.11 8 kN 55 kN 190.0 kg
CH-G A903 96.13 PAM180 96.13:1 IEC 180 · 48 mm shaft 18.5 kW 14.6 r/min 12131 Nm 0.66 8 kN 55 kN 190.0 kg
CH-G A903 96.13 PAM200 96.13:1 IEC 200 · 55 mm shaft 30 kW 14.6 r/min 19672 Nm 0.41 8 kN 55 kN 205.0 kg
CH-G A903 86.43 PAM132 86.43:1 IEC 132 · 38 mm shaft 7.5 kW 16.2 r/min 4422 Nm 1.81 8 kN 55 kN 182.0 kg
CH-G A903 86.43 PAM160 86.43:1 IEC 160 · 42 mm shaft 11 kW 16.2 r/min 6485 Nm 1.23 8 kN 55 kN 190.0 kg
CH-G A903 86.43 PAM180 86.43:1 IEC 180 · 48 mm shaft 18.5 kW 16.2 r/min 10906 Nm 0.73 8 kN 55 kN 190.0 kg
CH-G A903 86.43 PAM200 86.43:1 IEC 200 · 55 mm shaft 30 kW 16.2 r/min 17686 Nm 0.45 8 kN 55 kN 205.0 kg
CH-G A903 79.13 PAM132 79.13:1 IEC 132 · 38 mm shaft 7.5 kW 17.7 r/min 4049 Nm 1.98 8 kN 55 kN 182.0 kg
CH-G A903 79.13 PAM160 79.13:1 IEC 160 · 42 mm shaft 11 kW 17.7 r/min 5938 Nm 1.35 8 kN 55 kN 190.0 kg
CH-G A903 79.13 PAM180 79.13:1 IEC 180 · 48 mm shaft 18.5 kW 17.7 r/min 9987 Nm 0.8 8 kN 55 kN 190.0 kg
CH-G A903 79.13 PAM200 79.13:1 IEC 200 · 55 mm shaft 30 kW 17.7 r/min 16194 Nm 0.49 8 kN 55 kN 205.0 kg
CH-G A903 71.4 PAM132 71.4:1 IEC 132 · 38 mm shaft 7.5 kW 19.6 r/min 3652 Nm 2.19 8 kN 54.3 kN 182.0 kg
CH-G A903 71.4 PAM160 71.4:1 IEC 160 · 42 mm shaft 15 kW 19.6 r/min 7304 Nm 1.1 8 kN 54.3 kN 190.0 kg
CH-G A903 71.4 PAM180 71.4:1 IEC 180 · 48 mm shaft 18.5 kW 19.6 r/min 9008 Nm 0.89 8 kN 54.3 kN 190.0 kg
CH-G A903 71.4 PAM200 71.4:1 IEC 200 · 55 mm shaft 30 kW 19.6 r/min 14607 Nm 0.55 8 kN 54.3 kN 205.0 kg
CH-G A903 63.02 PAM132 63.02:1 IEC 132 · 38 mm shaft 7.5 kW 22.2 r/min 3224 Nm 2.48 8 kN 51.2 kN 182.0 kg
CH-G A903 63.02 PAM160 63.02:1 IEC 160 · 42 mm shaft 15 kW 22.2 r/min 6448 Nm 1.24 8 kN 51.2 kN 190.0 kg
CH-G A903 63.02 PAM180 63.02:1 IEC 180 · 48 mm shaft 18.5 kW 22.2 r/min 7953 Nm 1.01 8 kN 51.2 kN 190.0 kg
CH-G A903 63.02 PAM200 63.02:1 IEC 200 · 55 mm shaft 30 kW 22.2 r/min 12896 Nm 0.62 8 kN 51.2 kN 205.0 kg
CH-G A903 59.26 PAM132 59.26:1 IEC 132 · 38 mm shaft 7.5 kW 23.6 r/min 3032 Nm 2.64 8 kN 49.6 kN 182.0 kg
CH-G A903 59.26 PAM160 59.26:1 IEC 160 · 42 mm shaft 15 kW 23.6 r/min 6064 Nm 1.32 8 kN 49.6 kN 190.0 kg
CH-G A903 59.26 PAM180 59.26:1 IEC 180 · 48 mm shaft 18.5 kW 23.6 r/min 7479 Nm 1.07 8 kN 49.6 kN 190.0 kg
CH-G A903 59.26 PAM200 59.26:1 IEC 200 · 55 mm shaft 30 kW 23.6 r/min 12127 Nm 0.66 8 kN 49.6 kN 205.0 kg
CH-G A903 53.66 PAM132 53.66:1 IEC 132 · 38 mm shaft 7.5 kW 26.1 r/min 2745 Nm 2.91 8 kN 47.2 kN 182.0 kg
CH-G A903 53.66 PAM160 53.66:1 IEC 160 · 42 mm shaft 15 kW 26.1 r/min 5489 Nm 1.46 8 kN 47.2 kN 190.0 kg
CH-G A903 53.66 PAM180 53.66:1 IEC 180 · 48 mm shaft 18.5 kW 26.1 r/min 6770 Nm 1.18 8 kN 47.2 kN 190.0 kg
CH-G A903 53.66 PAM200 53.66:1 IEC 200 · 55 mm shaft 30 kW 26.1 r/min 10979 Nm 0.73 8 kN 47.2 kN 205.0 kg
CH-G A903 48.5 PAM160 48.5:1 IEC 160 · 42 mm shaft 15 kW 28.9 r/min 4963 Nm 1.61 8 kN 44.9 kN 190.0 kg
CH-G A903 48.5 PAM180 48.5:1 IEC 180 · 48 mm shaft 22 kW 28.9 r/min 7279 Nm 1.1 8 kN 44.9 kN 190.0 kg
CH-G A903 48.5 PAM200 48.5:1 IEC 200 · 55 mm shaft 30 kW 28.9 r/min 9926 Nm 0.81 8 kN 44.9 kN 205.0 kg

Product Information

Motor pole count

All table figures assume a 4-pole motor (1400 r/min input) — the standard choice for most applications. A 2-pole motor (2800 r/min) doubles the output speed and a 6-pole motor (900 r/min) reduces it, and the power and torque ratings change with them — if you're running anything other than 4-pole, contact us and we'll size it for you.

Service factor — the number that decides how long your gearbox lives

It's the safety margin between what the gearbox can handle and what the motor asks of it: 1.0 means the gearbox works exactly at its rated limit (the catalogue's M2max); higher means reserve capacity — a cooler, quieter drive and a much longer life. As a guide: smooth, steady loads (light conveyors, centrifugal pumps) are fine near 1.0; moderate loads (heavier conveyors, packing machines) deserve 1.3 or more; heavy duty (mixers, bucket elevators, frequent starts, long running hours) should sit at 1.5–2.0.

If the service factor turns red after you pick a motor, that combination is below 1.0 — the motor can overload the gearbox in continuous use. It may be acceptable for light, intermittent duty, but for anything continuous choose a smaller motor, a different ratio, or the next gearbox size up — or ask us and we'll size it with you.

Radial loads

FR1 is the permissible radial load on the input shaft and FR2 on the output shaft (kN, applied at the shaft centre). Chain sprockets, belt pulleys and gears on the shaft all load it radially — check the figure against your drive, and ask us if your load is close to it. The catalogue also limits peak loads to 200 % of the nominal torque.

Need help specifying this product?

Our technical team can help you specify the right component. Add it to your quote basket above, or contact us directly.

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