The Chelsea 680QHMEX-56AF is an 8-bolt Power Take-Off from the Chelsea 680 Series, engineered for medium- to heavy-duty manual transmission applications. The cast iron housing and tapered cone bearings on the output shaft deliver a high intermittent torque rating characteristic of the 680 Series (375 lb-ft / 508 Nm, check application pages for actual rating). Output options include SAE A and SAE B pump flanges, ISO 7652 pump flange, and driveline configurations. Shift is accomplished via wire/cable or mechanical means. The series covers Eaton/Fuller, Volvo/Mack, Daimler/Detroit, and other manual transmissions with 8-bolt PTO apertures, with a deep-mount housing option available for Mack applications. Pro Gear and Transmission carries this genuine Chelsea part.
Features
8-bolt mounting for compatibility with Eaton/Fuller, Volvo/Mack, Daimler/Detroit, and other manual transmissions
Cast iron housing with tapered cone bearings on the output and input shafts
680 Series intermittent torque rating: 375 lb-ft (508 Nm) - check application pages for actual rating
Output options include SAE A pump flange, SAE B pump flange, ISO 7652 pump flange, and driveline
Wire/cable or mechanical shift types supported
Deep-mount housing option available for Mack transmission applications
Tech Specs
- Mounting Type: 8-Bolt
- Shift Type: Wire/Cable or Mechanical
- Output Type: SAE A Pump Flange, SAE B Pump Flange, ISO 7652 Pump Flange, Driveline
- Series Intermittent Torque (680 Series): 375 lb-ft / 508 Nm (check application pages for actual rating)
- Continuous Operation: Yes, with 30% de-rating
- Output Power: 56+ HP / 51+ kW
- Shaft Power: 36 HP at 500 RPM, 71 HP at 1000 RPM, 107 HP at 1500 RPM
- Transmission Compatibility: Eaton/Fuller, Volvo/Mack, Daimler/Detroit, and other 8-bolt manual transmissions
- Lubricant: No Pressure Lube (X designation)
Additional Information
The Chelsea 680 Series is suited for higher-torque vocational applications including pneumatic blowers, aerial equipment, dump trucks, refuse trucks, fire and rescue, snow and ice removal, and service trucks. The 360-degree rotatable flange option (where applicable within the series) allows improved pump positioning. Four internal speed ratios and up to ten shift options are available across the 680 Series lineup. Refer to the 680 Series Sales Literature and Parts List (HY25-2660-M1_US) for full ratio and output configuration details.Parts Manual: Chelsea 680 Series PTO Parts Manual (PDF) — exploded views, item numbers and the full parts breakdown for this series.
