70D PTO Problem

dgisme

New User
I'm looking at a 1955 model 70 Diesel to purchase and can't get the PTO lever to move.

The powershaft engagement lever works, but the PTO lever located at the lower right of the seat area will not move up at all. Don't want to pull too hard on it at this point.
The situation with the tractor is one where the person selling it unfortunately knows nothing about the repair / maintenance history. It's had some restoration work done but is
far from completely finished. The pony runs great, the diesel starts right up and it drives fine in all gears high, low range etc. Just cant engage the PTO.....Wondering if its a
known issue (stuck from sitting over a year) Do they do that? or, maybe it's been broken for years. I ordered manuals for it and they will arrive in a day or two. Thought I
would ask just in case it's an easy fix.
 
"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">the PTO lever located at the lower right of the seat area will not move up at all[/i:654c4848f0][/b:654c4848f0]</font>"

You might consider adjusting the clutch.

Take a look at the diagram below.

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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 [b:654c4848f0]SERVICE MANUAL FOR JOHN DEERE DEALERS MODEL 70 DIESEL TRACTOR (GENERAL PURPOSE AND STANDARD[/b:654c4848f0] in the [b:654c4848f0][i:654c4848f0]Engine Driven Power Shaft[/i:654c4848f0][/b:654c4848f0] section under the [b:654c4848f0]CLUTCH ADJUSTMENT[/b:654c4848f0] 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.

a223385.jpg" width="650"


Now remove large plug ?A? and small plug ?B? from the right side of the clutch housing.

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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.

a223387.jpg" width="650"


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.

a223389.jpg" width="650"


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.

a223390.jpg" width="650"


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. [i:654c4848f0]NOTE: 3/32-inch welding rod gauge is satisfactory for minimum clearance.[/i:654c4848f0]

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 [b:654c4848f0]tightens[/b:654c4848f0] the clutch, will [b:654c4848f0]increase[/b:654c4848f0] the clearance. Turning the cam clockwise, which [b:654c4848f0]loosens[/b:654c4848f0] the clutch, will [b:654c4848f0]decrease[/b:654c4848f0] 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 ? turn; then secure it in place with lock nut and replace cap nut."

a223393.jpg" width="650"


Hope this helps.
 
I had the same problem with my 60 that was sitting for a couple of years. The first thing I did was change the fluid in the pto clutch and put in 10 wt oil. Then I got a pipe wrench on the pto shaft and just started moving back and fort and eventually it started to move a little and finally I just put some torque to it with a a long pipe and got it to turn , but it was tight. Then I started the tractor and pulled up on the clutch and with a little force I got it to engage and start to spin.

Make sure when you first try to get it to move the tractor is out of gear and pto is disengaged.
 
Thank you gentlemen for the two very helpful responses. The clutch adjusting tutorial with pictures is excellent and Chas036 confirmed my suspicions regarding the clutch plates being all stuck together. It'll probably be easier to fix than a clutch disk rust stuck to a flywheel (boy, is that a good time or what?) This is my first time posting on any forum anywhere. (made it to 58 before I had to ask for help) Just kidding! It's nice to know that there are friendly, knowledgeable people willing to take the time to help others. This will be my first two cylinder tractor, so the fun begins....
 

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