"does the clutch have to be engaged when you measure the 90 clearance or not engaged?"
Engage the clutch.
Take a look at the diagram below.
Note the adjusting cam (Key 40), locking screw (Key 37), clutch brake facing (Key 17), cam disk (Key 15), power shaft (Key 1), and clutch brake plate facing (Key 32).
Reviewed the SERVICE MANUAL FOR JOHN DEERE DEALERS MODEL 70 DIESEL TRACTOR (GENERAL PURPOSE AND STANDARD in the Engine Driven Power Shaft section under the CLUTCH ADJUSTMENT topic on pages 135-10-7 and 135-10-8.
"Before attempting to adjust the clutch be sure the power shaft shift lever is in the disengaged position.
Now remove large plug “A” and small plug “B” from the right side of the clutch housing.
The large opening will expose the adjusting cam and locking screw provided for making clutch adjustment. The small opening will permit you to check clearance between the clutch brake facing and cam disk.
With power shaft clutch engaged, peer into the large opening and see if you can locate the locking screw in one of the notches of the clutch adjusting cam.
If the screw cannot be seen, engage the clutch, then, using vise grip pliers or a suitable wrench on the power shaft, turn the shaft (and cam)a few degrees. The adjusting cam will turn only with the power shaft clutch engaged.
Disengage clutch and again see if the locking screw is visible. It may be necessary to engage the clutch, turn the power shaft, and disengage the clutch several times before the locking screw is correctly positioned. The screw must be visible before proceeding with the adjustment.
Engage the clutch. Working through the small opening, use a piece of wire .090-incb in diameter to measure clearance between clutch brake plate facing and flange of cam disk. On a properly adjusted clutch this clearance is .090-inch minimum. NOTE: 3/32-inch welding rod gauge is satisfactory for minimum clearance.
Working through the large opening, turn the adjusting screw cam locking screw in until its head clears the slot in the adjusting cam. Now turn the adjusting cam in a counter-clockwise direction (viewed from the rear) to tighten the clutch moving the adjusting cam only one notch at a time while checking clearance through the small hole. Turning the cam counter-clockwise, which tightens the clutch, will increase the clearance. Turning the cam clockwise, which loosens the clutch, will decrease the clearance.
After the .090-inch clearance has been obtained, rotate the clutch and check clearance in two or three different positions to make sure that adjustments satisfactory in all positions.
When the adjustment is completed, turn the locking screw outward, into one of the notches of the adjusting cam. Replace the plugs.
If tractor is equipped with a clutch fork adjustment screw (tractors with Serial No. below 7031300), remove cap nut, engage clutch and turn adjusting screw in until it touches fork. Back adjusting screw off ¼ turn; then secure it in place with lock nut and replace cap nut."
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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