Detroit Diesel — Power Take-Off Clutch Adjustment
Adjustments
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- The thrust load on the bronze clutch release bearing should be kept at an absolute minimum; position the hand lever near the 12 or 6 o'clock position.
Procedure
- Disengage the clutch with the hand lever.
- Remove the inspection hole cover to expose the clutch adjusting ring.
- Remove the clutch adjusting ring spring lock screw and lock.
- Hold the clutch drive shaft and turn the adjusting ring counterclockwise until desired hand lever pressure is obtained.
- Start the engine at idling (about 500 rpm) with clutch disengaged.
- Check engagement pressure; if lower than after adjustment, stop the engine and readjust.
- Install the inspection hole cover.
Tools required
- Spring scale or torque wrench with adapter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 8" clutch: 55 psi / 56-63 lb-ft
- 10" clutch: 80 psi / 76-85 lb-ft
- 11-1/2" clutch: 100 psi / 87-94 lb-ft
- 15-1/2" clutch: 105 psi / 113-127 lb-ft
Source: Detroit Diesel service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.