GM Full-Size Trucks 1970-1979 Repair Guide

Adjustments

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PEDAL FREE-PLAY



1970-72 Models

See Figure 1



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Fig. Fig. 1: Clutch pedal free-play adjustment - 1970-72 vehicles

Only one adjustment is necessary to assure that the clutch operates efficiently. This adjustment is for the amount of free clutch pedal travel before the throwout bearing contacts the clutch fingers. The pedal should be adjusted at periodic intervals to provide 3 / 4 -1 in. of free pedal travel.

  1. Disconnect the clutch fork return spring at the fork.
  2.  
  3. Loosen the nut (A) and back it off approximately 1 / 2 in. from the swivel.
  4.  
  5. Hold the clutch fork pushrod against the fork to move the throwout bearing against the clutch fingers. The pushrod will slide through the swivel at the cross-shaft.
  6.  
  7. Rotate the lever until the clutch pedal contacts the bumper mounted on the parking brake support.
  8.  
  9. Adjust nut (B) to obtain 1 / 4 in. clearance between nut (B) and the swivel.
  10.  
  11. Release the pushrod, connect the return spring and tighten nut (A) to lock the swivel against nut (B).
  12.  
  13. Check the free pedal travel at the pedal and readjust as necessary.
  14.  

1973-79 Models

See Figure 2



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Fig. Fig. 2: Clutch pedal free-play adjustment - 1973-79 vehicles

  1. Disconnect the return spring at the clutch fork.
  2.  
  3. Rotate the clutch lever and shaft assembly until the clutch pedal is firmly against the rubber bumper on the brake pedal bracket.
  4.  
  5. Push the outer end of the clutch fork rearward until the throwout bearing lightly contacts the pressure plate levers.
  6.  
  7. Loosen the locknut and adjust the rod length so that the swivel slips freely into the gauge hole. Increase the rod length until all lash is removed.
  8.  
  9. Remove the swivel from the gauge hole. Insert the swivel in the lower hole in the lever. Install two washers and the cotter pin. Tighten the locknut, being careful not to change the rod length. Reinstall the spring and check the pedal free travel. It should be 1 3 / 8 -1 5 / 8 in.
  10.  

If you have a problem with driveline chatter in reverse on an early 1973 model, this can be corrected with a service kit (no. 340607) containing a new clutch cross shaft and relocated clutch fork springs. The kit components were installed at the factory in later models.

 
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