Blue Torque H/D F'wheel Safety Clutches Heavy Duty Units allow PTO driven implements to freewheel with adjustable safety protection under load. Prevents expensive damage to internal tractor PTO packs due to sudden PTO stop-start. Integral heavy duty adjustable dISc type safety clutch provides overload protection. 100 HP Capacity - 200mm (8") Diameter Part No. DESCRIPTION B7250 1 3/8" x 6 spline male / female B7251 1 3/4" x 20 spline male / female B7249 1 3/8" x 6 spline male / 1 3/8" x 21 spline female B7257 1 3/4" x 20 spline male / 1 3/4" x 6 spline female B7259 SPECIAL - Reverse Rotation for tractor FRONT PTO Applications 1 3/8" x 6 spline male / female A = 185mm   (7.3") 150 HP Capacity 4 Plate Clutch - 200mm (8") Diameter Part No. DESCRIPTION B7252 1 3/4" x 20 spline male / female B7256 1 3/4" x 20 spline male / 1 3/4" x 6 spline female B7254 1 3/8" x 6 spline male / female B7253 1 3/4" x 20 spline male / 1 3/8" x 6 spline female A = 200mm   (7.875") 220 HP Capacity 6 Plate Clutch - 200mm (8") Diameter Part No. DESCRIPTION B7260 1 3/4" x 20 spline male / female B7261 1 3/4" x 20 spline male / 1 3/4" x 6 spline female B7262 1 3/4" x 20 spline male / 1 3/8" x 6 spline female A = 230mm   (9") REMEMBER THIS! To adjust these BARE-Co PTO clutches: Basic Spring Length 31.75mm (1 1/4") Adjust to slip on overload.. At 6 Months, back off to polISh dIScs Tighten Shaft Clamping Bolts as Below. Repeat after 8 Hours + every 40 hours. Pair of 1/2" dia Clamp Bolts 75 ft lbs Pair of 5/8 " dia Clamp Bolts 150 ft lbs Single Cotter Clamp Bolt 100 ft lbs Note:   LOOSE BOLTS = STRIPPED SPLINES.