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Clutch - Friction

PTO CLUTCH YOKE TYPE A4

1 3/8 X 6 SPLINE CLAMP BOLT

Product Code: AK421090
$239.25
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Bare Co. yoke type friction disk safety clutch is designed to attach directly to the PTO shaft universal joint, reducing length and components. Ideal for use in agricultural applications including slashers, chaser-bins and other PTO powered machinery. 

Features
  • Series 4 integrated yoke 27mm x 74.6mm
  • Reduce clutch overhang and assembly length
Specifications

Part Number AK421090
Rated Torque 467NM (340 ft-lb)
Rated Horsepower 35hp (26kW) @ 540rpm 56HP (42kW) @ 1000rpm
Diameter 180mm (7")
Output Series 4 yoke 27mm x 74.6mm
Input Shaft 1-3/8" Z6 Spline - Female
Clamping Method Clamp Bolt

Important

To adjust all BARE-Co PTO clutches with painted, gold or silver springs:
  • Compress springs fully then back off 2 turns.
  • Fine tune so that the clutch slips occasionaly
  • On 20 spline models, clutch retaining (clamp) bolts must be tightened to 150 ft/lbs to clamp clutch to shaft - LOOSE BOLTS = STRIPPED SPLINES.
  • Once per year release springs completely and allow clutch to slip to polish pressure plate.
When delivered from the factory, friction clutches are normally set to their rated torque settings. This is achieved by tensioning the clutch springs to their maximum compressed length. Compressing the springs beyond these lengths will cause damage to the clutch

This is a general guide on how to correctly set a Bare Co. friction clutch

Step Action Specification
1. Intial Spring Compression Standard Duty (Sliver or Gold Springs) All sizes - Compress fully then back off 2 turns. 
Blue Torque (Blue Springs) 150mm (6") Clutch - Compress spring to 28mm overall length
Blue Torque (Blue Springs) 200mm (8") Clutch - Compress spring to 31mm overall length
2. Operate Clutch Run machine for approximate 10 minutes
3. Check Clutch Springs Set Correctly - Warm to touch approx 45C (Like a warm cup of tea)
Springs Overtight - Cool to touch, springs too tight, back off  each spring 1/4 turn and retest
Springs Loose - Hot to touch, over 60C (Excessive slipping) tighten spring 1/4 turn and retest
4 Storage When clutch is not in use, back off spring nuts completely and remove all tension from springs
5. Maintainence At 6 Months, back off to polish discs.

How to free up the clutch after a period of storage:

As outlined in the instructions on most implements, the slip clutch can seize if left for long periods without use, or left outside in the elements. The best way to free up a slip clutch is to loosen all the bolts that hold the spring tension on the friction plates (so they are quite loose), then run the machine with it either jammed so it cannot move, or put into heavy work, to slip the clutch. The clutch only needs to be slipped for 30 seconds to a minute to clean up the surfaces. Alternatively dismantle the clutch and clean it.

Clutch Hub Tightening Torque

Type Specification
Clamp Bolt Style  2 x 1/2" Bolts 75 ft lb (101Nm)
Clamp Bolt Style 2 x 5/8" Bolts 150 ft lb (200Nm)
Single Cotter Clamp Bolt 100 ft lb (135Nm)
Retension clamp bolts Every 100 Hours
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