Mister Mangle
Model 85 "Heart Transplant"
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(Changing out the gearbox and roller assembly)

img_5953.jpg
This shows the "heart" with cloth roller cover removed and motor/heat switch plate removed

A Model 85 Heart Transplant

(Changing out the gearbox/roller assembly)

First, let's define what I mean by the Heart, or gearbox/roller assembly. It is the heart of your mangle, a large, heavy metal casting which holds the roller assembly, the heating shoe, and, at the rear, the gearbox. A picture is worth a thousand words, so here's a picture of what I'm talking about:

 img_5953.jpg

 (The picture above shows the "heart."  This one has the cloth roller cover and heat/motor switch plate removed)  

  The only reason I can think of to do this would be if you have a Model 85 with a perfect cabinet but something has failed in the gearbox. You want to save the cabinet and replace the Heart. If you have another Heart but it's on an ugly cabinet, then you are a candidate for this procedure.

Please note that you do not have to do this procedure if your only problem is that the shoe does not heat or heats unevenly, or the motor burns out. You make these repairs without removing the complete Heart. (See other articles on this site for shoe or motor repairs)

Good news! The Heart is attached to the cabinet by only four bolts and two screws. Well, that's not exactly all. There's a couple levers that have to be disconnected under the cabinet. There are three parts to this procedure. First, you remove the bad Heart from the good cabinet. Second, you remove the good Heart from the bad cabinet. Finally, you install the good Heart on the good cabinet. Here is a step-by-step description:

Remove the Bad Heart from the good cabinet:

1. Unplug the power cord!

2. Remove the cabinet cover.

3. Decide if you want to save any parts. Things you might want to save are:

a. Shoe/thermostat assembly

b. Motor

c. Switch assembly in front (the Heat and Motor switches and associated indicator light)

d. Roller cover and pad

There are articles on this web site to help you with removing the above items.

Important Note!! The article on the motor will tell you this, but in case you miss it, remember this: Before you remove the motor, Drain the oil!!!! There's another article on how to do that.

4. Remove lower cover (see picture)  (Sorry, pictures not yet uploaded. Soon, I hope!)

5. Remove back cover (picture)  (Sorry, pictures not yet uploaded. Soon, I hope!)

6. Inside the back cover, locate the wires from the power cord and make a sketch of where they are hooked up. Remove these wires and label them in reference to your sketch.

7. Pull the power cord wires out of the housing. (Note: If this power cord is an updated, three-prong grounded plug, save it.)

Note: The next few steps will require you to lay on your back under the cabinet, so you might as well collect the tools you need and have them handy. You need a small rachet with a 1/2 inch socket, a 1/2 inch wrench, small and large flat head screwdrivers, and needle-nose pliers.

8. Remove the four bolts holding the Heart to the cabinet.

(Sorry, pictures not yet uploaded. Soon, I hope!)

9. Remove the two small screws under front of cabinet.

(Sorry, pictures not yet uploaded. Soon, I hope!)

10. Using needle-nose pliers, remove clip from lever that connects left knee

10. Using needle-nose pliers, remove clip from lever that connects left knee pedal to cam at center of cabinet. Move lever aside.

(Sorry, pictures not uploaded yet. Soon, I hope!)

11. Also with needle-nose pliers, remove cotter pin from outside end of lever that connects right knee pedal to cams at center. To better access this cotter pin, you might have to remove clip on bell crank and lower bell crank to expose cotter pin. (picture) Once the outside end of rod is free, the rod will hang down and can be removed. Just be sure you take a good look at it first so you remember how to re-attach it!

12. The Heart is now free to be lifted off the cabinet. It's fairly heavy, especially if all parts are attached (shoe and motor), so it's wise to have two people for this step.

Remove the Good Heart from the bad cabinet:

1. Unplug the power cord!

2. Remove the cabinet cover.

4. Remove lower cover

(Sorry, pictures not yet uploaded. Soon, I hope!)

5. Remove back cover

(Sorry, pictures not yet uploaded. Soon, I hope!)

 

6. Inside the back cover, locate the wires from the power cord and make a sketch of where they are hooked up. Remove these wires and label them in reference to your sketch.

7. Pull the power cord wires out of the housing. (Note: If this power cord is an updated, three-prong grounded plug, save it. If you have an old ungrounded, two-prong cord, especially if it one of those ancient fabric-covered ones, now is the time to replace it. See article on this site on how to do this.)

8. Using needle-nose pliers, remove clip from lever that connects left knee pedal to cam at center of cabinet. Move lever aside. (picture)

9. Also with needle-nose pliers, remove cotter pin from outside end of lever that connects right knee pedal to cams at center. To better access this cotter pin, you might have to remove clip on bell crank and lower bell crank to expose cotter pin. (picture) Once the outside end of rod is free, the rod will hang down and can be removed. Just be sure you take a good look at it first so you remember how to re-attach it!

10. It's best if you have another person help with this step. You are going to lift the good Heart off the cabinet, taking great care to avoid tilting it too much. Warning! Too much tilting may allow oil to leak out of gearbox into motor! Once you and your helper have lifted the heart out, you may place it directly onto the good cabinet or set it aside and take a rest!

 

 

Installing the good heart onto the good cabinet:

1. This is best done with a helper. Set the heart gently into place and make sure it is level. Check under the cabinet to see if the bolt holes align. Adjust as necessary.

Note: The next few steps will require you to lay on your back under the cabinet, so you might as well collect the tools you need and have them handy. You need a small rachet with a 1/2 inch socket, a 1/2 inch wrench, small and large flat head screwdrivers, and needle-nose pliers.

2. Re-attach the four bolts but only finger-tight.

3. Re-attach the two screws near front but only finger-tight.

4. Tighten the bolts and screws above gradually, making sure everything is correctly aligned, until they are all tight.

5. Re-attach rods to bell cranks. You will be reversing steps listed above concerning rods and bell cranks.

6. Insert power cord wires into rear compartment. (Use a new, three-prong grounded cord if required)

7. Re-install rear cover.

8. Reinstall lower cover.

9. Turn on heat and motor. Check for proper operation, then turn off.

10. Re-install cabinet cover.

 

 

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