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Chiaravalli CH-G D 303 shaft mounted gear unit (chiaravalli.com product image)
Chiaravalli

CH-G D 303 Shaft Mounted Gear Unit (Ø30 mm hollow output shaft)

Cast Iron Gearboxes CH-G

CH-G D 303 parallel shaft mounted gear unit — Chiaravalli's cast iron series: three-stage, size 30, ratios 73.96:1 to 314.13:1. Hollow output shaft Ø30 mm H7 (D version; the M version has a solid shaft). Made to order: the catalogue lists every D/M version (B14 or B5 flange, KS shrink disc, LT rubber buffer, Ç fixing element, M solid shaft) as available on request — ask us for the lead time. Backstop device available on request (specify the free direction of rotation). PAM motor input for IEC 63, 71, 80, 90 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 314.13:1 gives 4 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, 0.17 to 0.73 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 FR2GRRadial load FR2 Weight
CH-G D303 314.13 PAM63 314.13:1 IEC 63 · 11 mm shaft 0.12 kW 4.5 r/min 247 Nm 1.42 1.4 kN 6 kN 6 kN 19.0 kg
CH-G D303 314.13 PAM71 314.13:1 IEC 71 · 14 mm shaft 0.25 kW 4.5 r/min 515 Nm 0.68 1.4 kN 6 kN 6 kN 20.0 kg
CH-G D303 256.27 PAM63 256.27:1 IEC 63 · 11 mm shaft 0.18 kW 5.5 r/min 300 Nm 1.17 1.4 kN 6 kN 6 kN 19.0 kg
CH-G D303 256.27 PAM71 256.27:1 IEC 71 · 14 mm shaft 0.25 kW 5.5 r/min 417 Nm 0.84 1.4 kN 6 kN 6 kN 20.0 kg
CH-G D303 217.41 PAM63 217.41:1 IEC 63 · 11 mm shaft 0.25 kW 6.4 r/min 350 Nm 1 1.4 kN 6 kN 6 kN 19.0 kg
CH-G D303 217.41 PAM71 217.41:1 IEC 71 · 14 mm shaft 0.25 kW 6.4 r/min 350 Nm 1 1.4 kN 6 kN 6 kN 20.0 kg
CH-G D303 217.41 PAM80 217.41:1 IEC 80 · 19 mm shaft 0.55 kW 6.4 r/min 770 Nm 0.45 1.4 kN 6 kN 6 kN 21.0 kg
CH-G D303 217.41 PAM90 217.41:1 IEC 90 · 24 mm shaft 1.1 kW 6.4 r/min 1540 Nm 0.23 1.4 kN 6 kN 6 kN 21.0 kg
CH-G D303 198.4 PAM63 198.4:1 IEC 63 · 11 mm shaft 0.25 kW 7.1 r/min 324 Nm 1.08 1.3 kN 6 kN 6 kN 19.0 kg
CH-G D303 198.4 PAM71 198.4:1 IEC 71 · 14 mm shaft 0.25 kW 7.1 r/min 324 Nm 1.08 1.3 kN 6 kN 6 kN 20.0 kg
CH-G D303 177.36 PAM63 177.36:1 IEC 63 · 11 mm shaft 0.25 kW 7.9 r/min 292 Nm 1.2 1.3 kN 6 kN 6 kN 19.0 kg
CH-G D303 177.36 PAM71 177.36:1 IEC 71 · 14 mm shaft 0.25 kW 7.9 r/min 292 Nm 1.2 1.3 kN 6 kN 6 kN 20.0 kg
CH-G D303 177.36 PAM80 177.36:1 IEC 80 · 19 mm shaft 0.55 kW 7.9 r/min 642 Nm 0.55 1.3 kN 6 kN 6 kN 21.0 kg
CH-G D303 177.36 PAM90 177.36:1 IEC 90 · 24 mm shaft 1.1 kW 7.9 r/min 1283 Nm 0.27 1.3 kN 6 kN 6 kN 21.0 kg
CH-G D303 137.31 PAM63 137.31:1 IEC 63 · 11 mm shaft 0.25 kW 10.2 r/min 224 Nm 1.56 1.3 kN 6 kN 6 kN 19.0 kg
CH-G D303 137.31 PAM71 137.31:1 IEC 71 · 14 mm shaft 0.37 kW 10.2 r/min 332 Nm 1.05 1.3 kN 6 kN 6 kN 20.0 kg
CH-G D303 137.31 PAM80 137.31:1 IEC 80 · 19 mm shaft 0.55 kW 10.2 r/min 494 Nm 0.71 1.3 kN 6 kN 6 kN 21.0 kg
CH-G D303 137.31 PAM90 137.31:1 IEC 90 · 24 mm shaft 1.1 kW 10.2 r/min 987 Nm 0.35 1.3 kN 6 kN 6 kN 21.0 kg
CH-G D303 117.1 PAM63 117.1:1 IEC 63 · 11 mm shaft 0.25 kW 12 r/min 194 Nm 1.8 1.3 kN 6 kN 6 kN 19.0 kg
CH-G D303 117.1 PAM71 117.1:1 IEC 71 · 14 mm shaft 0.37 kW 12 r/min 288 Nm 1.22 1.3 kN 6 kN 6 kN 20.0 kg
CH-G D303 117.1 PAM80 117.1:1 IEC 80 · 19 mm shaft 0.55 kW 12 r/min 428 Nm 0.82 1.3 kN 6 kN 6 kN 21.0 kg
CH-G D303 117.1 PAM90 117.1:1 IEC 90 · 24 mm shaft 1.1 kW 12 r/min 856 Nm 0.41 1.3 kN 6 kN 6 kN 21.0 kg
CH-G D303 95.53 PAM63 95.53:1 IEC 63 · 11 mm shaft 0.25 kW 14.7 r/min 156 Nm 2.24 1.3 kN 6 kN 6 kN 19.0 kg
CH-G D303 95.53 PAM71 95.53:1 IEC 71 · 14 mm shaft 0.55 kW 14.7 r/min 344 Nm 1.02 1.3 kN 6 kN 6 kN 20.0 kg
CH-G D303 95.53 PAM80 95.53:1 IEC 80 · 19 mm shaft 0.55 kW 14.7 r/min 344 Nm 1.02 1.3 kN 6 kN 6 kN 21.0 kg
CH-G D303 95.53 PAM90 95.53:1 IEC 90 · 24 mm shaft 1.1 kW 14.7 r/min 688 Nm 0.51 1.3 kN 6 kN 6 kN 21.0 kg
CH-G D303 73.96 PAM63 73.96:1 IEC 63 · 11 mm shaft 0.25 kW 18.9 r/min 120 Nm 2.92 1.2 kN 6 kN 6 kN 19.0 kg
CH-G D303 73.96 PAM71 73.96:1 IEC 71 · 14 mm shaft 0.55 kW 18.9 r/min 264 Nm 1.33 1.2 kN 6 kN 6 kN 20.0 kg
CH-G D303 73.96 PAM80 73.96:1 IEC 80 · 19 mm shaft 0.55 kW 18.9 r/min 264 Nm 1.33 1.2 kN 6 kN 6 kN 21.0 kg
CH-G D303 73.96 PAM90 73.96:1 IEC 90 · 24 mm shaft 1.1 kW 18.9 r/min 527 Nm 0.66 1.2 kN 6 kN 6 kN 21.0 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.

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