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Help Needed with Rake Sweep Issue..Driving me bonkers!


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  • Help Needed with Rake Sweep Issue..Driving me bonkers!

    Hi guys, I have 20 lanes of A2 JetBacks.

    I am having an issue on Lane 3. On the 7 pin side, when a pin lays in the flat gutter with the butt towards the pit....The rake sweeps the pins back to the shaker board, but the rake starts to raise on the 4,5,6 row and get above the head of the pin before the pin gets completely on the shakerboard. Then when the rake goes down and back to 90* it pinches the neck of the pin and pulls it out onto the flat gutter again.

    I have tried adjusting the rake higher lower improvement. Im pretty sure I need to adjust the sweep to start the raise up closer to the back row pin spots.

    Im pretty positive the big cam needs to be adjusted but Im not sure.

    Can anyone give me any ideads or procedures on how to accomplish this.

    Thank you very much!! This has been driving me nuts for some time now. Any help will be greatly appreciated!

  • #2
    Here is a procedure for setting the rake cam timing.

    Go with what works and not what the book says.


    • #3
      Here is a procedure for setting the rake cam timing.

      It's possible some bowlers may have hit the rake knocking the cam out of time.
      Go with what works and not what the book says.


      • #4
        anything out there with a little more detail?


        • #5
          Here you go.

          Go with what works and not what the book says.


          • #6
            I am not a big fan of that article...and I am the one that wrote it.

            I did that article as a generic introduction to the rake system and the adjustments that are involved. You will find this set of instructions a bit more exact.

            Follow this adjustment step by step. Don't cut any corners:

            Step 1: Perform deck lift shaft adjustment. Adjustment 13 on page 3-16 in your service manual. This will position the deck lift shaft and the rake sweep shaft in the proper positions.

            Step 2: At zero degrees, position "C" lever so that its closest point is 1/4" from rake sweep shaft. To adjust, cycle to 90 degrees and loosen set screw on rake trip shaft assy. (If you loose the gap at the trip latch, don't worry. Don't open trip latch until you get done with step 7) Remember that the shaft must be adjusted in 1 turn increments. Each rotation of the shaft is about 1/32” change in gap.

            Step 3: At 45 degrees, raise out-of-range latch. Set rake sweep hook clearance above block to 5/16" by adjusting the link between the collar for the curved shoe and the rake hook sweep cam follower. (You should have changed 12-250040 link and roll pins if there was too much wear) This adjustment may cause you to have to adjust the out-of-range latch.

            Step 4: While still at 45 degrees, lower out-of-range latch. Pull the out-of-range reset lever at the rear of the pinsetter and while holding it in its rearmost position, rotate the middle cross brace until the short inner arm on the out-of-range blocking latch just drops over the pin in the cross brace. (The reset lever can be held in its most rearward position by placing the palm of your hand on the connection of the adjusting link and the collar for the curved shoe and holding this down) Tighten the bolts. The cross brace may be rotated by placing a pin punch through one of the roll pins in the center cross brace.

            Step 5: Position rake at rearmost position (180 degrees) and measure gap between rake sweep arms and cross member of frame. This gap should be 1/4" at the closest point of either arm. This gets the rake as far to the rear as possible without hitting the frame. Use the rake sweep link to obtain this clearance.

            Step 6: While still at 180 degrees, loosen rake lowering stop bracket and allow it to fall away from rake lift shaft. Position rake lift cam follower in low of rake lift cam by rotating the gear box by hand and watching the rake lift shaft until it has reached its furthest clockwise position. Adjust the rake lowering stop bracket to obtain 1/16" between it and the lower side of the "V" lever. Be sure the bottom of the stop bracket is solid against the frame of the pinsetter.

            Step 7: Loosen right hand rake stop and move it as far forward as possible. Position machine at 135 degrees and set clearance between rake sweep hook and block to 1/16"…or less if you like. Use your left hand rake stop bracket to obtain this clearance. Tighten left hand rake stop bracket. Using the right hand stop bracket, push the bracket and the rake support arm rearward until the left support arm just starts to lose contact with the left stop bracket. Both sides should feel the same when pushed toward the rear. Tighten right hand bracket.

            Step 8: Loosen jam nut on shock absorber plunger and turn fixed stop counter-clockwise until rake trip latch WON'T latch. (You will have to trip it back to see if it won't latch.) When you reach that point where the trip latch won't latch, start turning the fixed stop clockwise until the latch just falls back into place. Turn fixed stop 1/2 turn more clockwise and lock jam nut into place. This will create a 1/32" gap (actually, slightly less) at the latch.

            Step 9: Position rake board between the 2,3 and the 4,5,6 spots on the rearward sweeping motion of the rake. Measure and record the height of the rake board. Continue to cycle pinsetter until the rake board is 1" behind the #1 pin spot on the forward motion of the rake. Measure and record the rake board height. Release the rake sweep hook and allow the rake to come forward. This will release the pressure off of the rake lift cam. Take the two measurements and find the amount of the difference between them. Divide the difference in half. If your first measurement is higher than your second measurement, add the divided difference to the second measurement and record it. Record this number as your "desired height". Loosen the six bolts holding the rake lift cam in place on the 1:1. Rotate the cam clockwise ever so slightly and tighten the bolts. Move rake rearward and latch back onto block so rake board is again 1" behind the #1 deck spot. Check to see if your rake height is at the "desired height" you wrote down before. If not, continue adjusting cam until you obtain that height. If you did this properly, you should be able to return to the spot between the 2,3 and the 4,5,6 spots on the rearward motion of the rake and obtain the exact same measurement. (If your second measurement was larger than the first, reverse the procedure by subtracting the divided difference from the measurement to obtain the "desired height". Then rotate the cam counter-clockwise to get the desired height.)

            Step 10: With rake at either position mentioned above (1 inch behind #1 deck spot on forward motion of rake or between the 2,3 and the 4,5,6 spots on the rearward motion) set rake board height to 1/4 of an inch by adjusting the rake lift rod from "V" lever to sweep arm. This clearance can be set to your preference, but I have found that 1/4 of an inch is a reliable height.

            By following these adjustments step by step, not skipping ANY of them, your rake will sweep near perfect. If you skip any adjustment or do them out of order, you will not obtain the desired effect. In other’re on your own. If you have any questions, feel free to call me...480-620-6758
            TSM & TSM Training Development
            Main Event Entertainment
            480-620-6758 for help or information


            • #7
              Will this process work for the older A's as well as the A2's that it was written for ?


              • #8
                There are some small differences between the A and A-2 rake mechanism. Many times you can not perform step 2 as the link between the rake lift cam follower and the rake lift shaft will not extend far enough to obtain the 1/4" clearance. This is not that important on the A that the clearance be at 1/4" as this dimension is mostly used to align the triggering of the rake on the A-2. Setting the link to the 22 3/8 inch spec in the manual will work just fine.

                Step 6 can not be done as the part does not exist on the A machine.

                Step 8 can not be done as the part does not exist on the A machine.

                Other than these...the adjustment still applies.
                TSM & TSM Training Development
                Main Event Entertainment
                480-620-6758 for help or information


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