DG7400 Dryer - Instructions

first, I unplug the power supply of the dryer then I removed the two screws at the bottom of the dryer then pulled out the front part of the dryer,unplugged the blue & yellow wire for the on/off switch for the door,at the back of the dryer I unscrew the pannel for the belt,disconect the belt,and I unscrew the four screws on both side of the front pannel to remove the front cover of the drum. Once I removed the front cover of the drum I can now remove the drum itself to access the drum support roller. I unscrew the rollers then replace it with the new once. It was an easy job.
Thank you.

Removed the front cover (screws on bottom 0f face)...removed blower cover....spring pliers to remove and install blower fan. the rest of the time was spent cleaning the inside of the shell as well as the vent. Reassembled and dryer runs better than it has for many years.

We followed the instructions for the drum glide replacement and changed the belt and drum support bearing piece, cleaned it out too. Works like a charm. Thanks for saving us a bundle.

1. Removed front of machine (2 screws at the bottom).
2. Removed 4 screws from inside the dryer, to take off the blower housing.
3. Removed 4 screws and took out the large metal piece which supports the drum at the front. Removed the drum.
4. Replaced the two rollers that support the drum in the rear. Cleaned the pins they run on, and oiled very lightly. Also replaced the idler roller. I was surpirsed to see that these rollers use plain bearings, not ball bearings.
5. On the front support piece, drilled out the rivets for the glides, and replaced the worn out glides with new parts. Applied a little glue (3M weatherstrip adhesive) to the cork pieces, to glue them to the metal. Attached the plastic pieces over the cork pieces, and riveted in place using rivets that came with the glide kits.
6. Replaced front and rear felt seals. This was not as tricky as I expected it to be. They were held in by metal tabs. Glued the ends where they came together.
7. Replaced the felt blower seal. Glued to the blower housing.
8. Reinstalled the drum, installed new belt, which came with good instructions (luckily).
9. Reassembled front support piece and the front of the cabinet.

I also cleaned the lint from the cabinet and from the vent hose.

In general, the job went without a hitch, and the machine probably has quite a few years left, despite the fact that it's 18 years old. This gives me a good feeling.

I'd say this would be challenging, though, for someone who is not pretty experienced with machinery repair. Also, the cost of the parts was significant enough that it would not have been unreasonable to have opted for a new machine.

PartSelect showed seven different possibilities why the dryer wouldn't heat. I removed the two screws to remove the bottom panel and turned the dryer on and noticed that the heating element that ignites the gas was working fine. This meant that it was not getting gas so it could be the gas valve or one of the two gas valve coils which are located on top of the gas valve. I borrowed my neighbor"s ohm meter and touched the two probes on the coils terminals to check for continuity and found that one of the coils read zero. I then took both of the coils out by removing two screws and tested each coil again. One coil read 500-850 and the other read zero. This meant that it was no good so I called for the part and received it in three days. I reassembled the parts and turned the dryer on and it fired up after a few seconds. It works as good as new. The part plus shipping was less than $30. My repairman would have charged me $150-$200. While the dryer was apart I gave it a good cleaning with a vacuum and a toothbrush in delicate areas. I also removed and cleaned the lint trap housing by removing two nuts. I didn't know much about gas dryers, but thanks to PartSelect I easily fixed it myself.

1. Unplug dryer from outlet
2. Using Lg. flat screwdriver, pry under the front edge of the top and release two spring tabs
3. Lift up top and tilt back out of your way
4. Unscrew two phillips scews on inside of front panel
5. Lift up and out the front panel. Two spring clips at bottom.
6. Rlease tension on drum belt at the motor. Access panel at rear of dryer.
7.Unscrew 3 screws from inside, center rear of drum.
8. Remove drum through the front of the dryer. You may have to spread the sides apart a little bit for it to fit
9. Lift up on the rear drum bearing to remove it from the bearing retainer. ( U shaped plastic socket)
10. unsrew 2 screws and remove the bearing retainer, ground ball. Ball retainer is on outside of dryer.
11. Vacuum everything--duct, blower, lint trap, ect.
12. Intall new bearing retainer and grounding ball, an assistant is helpful at this time, one to hold ball retainer on rear of dryer, one to screw it in from the inside
13. reassemble remainder of parts in reverse order.

If everything else is working ( tumbler and timer ) except for the heating. Your first bet would be checking your flat style igniter. Mine was cracked, something that I wouldnt have seen unless I had taken it off. Because of the crack no current was being passing through, therefore the igniter wasnt heating to its amber color. Since there wasnt any current the gas valve was doing its job by not allowing any gas to blow out. Dont worry about turning the gas off just disconnect your elecrical outlet. Remove whole front dryer panel by taking 2 front bottom screws out (philip screw driver). Dont pull to hard because there are two wires connected to the panel and dryer that you will have to disconnect. When you get to the igniter disconnect wire plug and use your socket set to loosen the single srew on the igniter, gently wiggle it out by just handling the white ceramic part of the piece, and replace new one in. Just remember to be careful since the dark part of the igniter that heats up is real brittle.

Unplugged Dryer.
Opened top of Dryer, over the drum.
Removed Thermal Limiter.
Tested the Thermal Limiter - found it was open.
Checked all vents and exhaust tube for lint build-up.
Replaced Thermal Limiter.
Closed top of dryer.
Plugged Dryer back.
Tested Dryer - it works.

There was no problem with lint build-up within the dryer & the exhaust vent. I removed the gas cycling thermostat & thermal fuse from system & dryer still was not operating correctly. The radiant sensor & hi-limit thermostat both seemed to be operating correctly. That left either of the two coils as the culprits. I replaced both coils & the problem was corrected.

I searched the internet and found my symptoms really seemed to indicate a problem with the blower wheel, which was very noisy. Feeling confident that was what I needed, I ordered the blower wheel, and also the tumbler belt (the belt was 12 years old). Both parts were genuine Maytag and arrived quickly. Before the order arrived, I went ahead and UNPLUGGED THE DRYER and disassembled the dryer using the partselect.com helpful parts diagrams and the repair notes of others. This allowed me to confirm the blower wheel was in fact loose on the motor shaft. I removed the old blower wheel and belt. Shop vac'd out the entire dryer cabinet. This way I was able to take my time with preparation, and when the new parts arrived, I was ready to just pop them into place. If you disassemble before you order, you can also determine if the tumbler front guide set and /or rear tumbler roller wheels also need to be replaced (mine did not), but this would have been the perfect time to replace those too. I saved a bunch of money and have the satisfaction of having done this job myself. Dryer works great now.

Unpluged dryer. Removed the top of dryer by pushing in a retaining clip on both sides of the front lip with a screw driver. Remove the two screws on both sides of front panel. These screws are square head or phillips #2. Unplugged the wiring harness to front panel (make sure power has been disconnected). Support drum and lean front panel away from dryer body. Front panel will pull off of tabs at bottom. The old drum glide is fiberous and hard to remove. I removed most of it with the pliers, but had to carefully scrape the balance of the glide off with the wood chisel. The adhesive that comes with the repair part has an acetone base, so I used acetone (or you could use nail polish remover) to remove the old adhesive. Once the acetone has dried, I applied an 1/8" snaking bead of adhesive to the front panel. There is more adhesive in the tube than you need so do not use too much. Make sure that you get adhesive as close to the base of the lower seal as you can. Follow directions on adhesive tube and then attach the glide. I let it set up for about 30 seconds. Place the front panel back on the tabs of the dryer. Carefully lift the drum an fit it on the front panel and insert the two screws holding the panel to the base. Reconnect the wiring harness and make sure it is not in contact with the drum. Check to make sure that all of the electrical connectors on the timer are still in place. Reassemble the dryer. Reconnect power.

Timer wasn't working on the regular cycle so I replace it with a new one from partselect. It still wasn't working so I ordered and replace the cycling thermostat, the thermal fuse I also cleaned the vent and dryer it still didn't work so I read the diagram for the electrical and found that a coil for the gas valve is line with timer. I ordered the coils for the valves, replaced both valves and tested the dryer and it work just like when I first bought the appliance.

I have a 15 year old Maytag dryer that finally broke its belt.

First I unplugged the dryer from the outlet, and then I removed the access plate in the back of the dry by removing the four screws. Once I removed the plate, it was quickly obvious that the belt had broken, as bits of belt were all over the interior of the dryer.

I removed the front panel of the dryer (where the main door is located) by removing the two retaining screws at the bottom of the panel. After removing the screws, I was able to swing the entire front assembly up and remove the panel. The door sensor is attached to the front panel by two wires; I simply pulled the two wires from the door sensor, which allowed me to completely remove the front panel from the dryer.

I removed four screws on either side of the dryer which attached the front tumbler assembly to the dryer frame. The tumbler assembly also has the lint screen attached to it as well. Removal of the lint screen allowed me greater access to the internals of the dryer. I took the opportunity to use my Shopvac to clean out the accumulated 15 years of dirt and lint from inside the dryer.

Once the front tumbler assembly was removed, the main dryer tumbler came out easily. I removed the tumbler from the dryer and inspected it for damage. I also did more cleaning inside the dryer with my Shopvac. Removal of the tumbler is required for installing the new belt.

I wrapped the new belt around the tumbler and reinserted the tumbler back inside the drier. I reinstalled the front tumbler assembly, but I didn't tighten the four screws until I was sure the main tumbler was seated correctly on both the rear and front tumbler assemblies. Only then did I tighten the four screws.

I then went to the back access panel on the dryer and threaded the belt around the dryer motor rotor and belt tensioning roller. The new belt twisted a few times in the process, so I manually rolled the tumbler to straighten out the belt.

Once I was confident the belt was seated properly around the tumbler and motor rotor, I replaced the front dryer panel loosely. I also reconnected the two wire door sensor and then plugged in the dryer. I purposely left the back access panel off, so I could observe the motor and belt while the dry was running. I turned the dryer to a non-heat setting (i.e. air fluff) and started the dryer. I observed the rotation of the belt for about 2 minutes to insure it was rolling properly. Next, I set the dryer to a heated setting and ran it again for 2 minutes to be sure all the heating elements were working. It is good to check both the rotation of the belt and the heat elements prior reinstalling the back access panel. There is nothing worse than putting the dryer back together only to discover the belt is improperly tensioned/seated or the dryer heater elements are no longer working.

I secured the dryer front panel using the two screws. I reattached the back access panel with the four screws. Finally, I reconnected the dryer hose.

Dryer is running like new and haven't had any further problems.

Determining the problem was the hardest part. With multiple parts (coils,thermostats...)possibly causing similar symptoms, I narrowed it down to the two coil valves.
Un plug the dryer. Remove two screws at the base of the front panel. Turn the front panel 180 degrees to avoid disconnecting the door switch. Gas valve with coils on top are on the right in front. Remove two screws in bracket holding coils, disconnect the wires, replace with new coils and reconnect wires. One coil has 2 terminals the other has 3 no chance of crossing the wires. I used an offset/right angle screw driver for one of the bracket screws due to close proximity to the drum. A stubby phillips head will work. You can check the burner operation with the front panel off as long as the door switch is still attached. Swing the front panel around and lift back into place securing with the two screws. Dryer works fine now.

I found a electrical diagram and some common problems on some websites which led me to check the thermal limiters. There are two right up top near the back of the dryer - one mounted closer to the heating coils and one mounted directly to the sheet metal on the inside back of the dryer. Using an DMM on the "Ohms" setting, I checked each sensor to make sure that they were "closed" (near zero ohms). Sure enough, the sensor mounted on the back of the enclosure was open (high resistance) which prevented the dryer from starting. To confirm, I shorted the two leads going to the sensor together temporarily and wrapped them with electrical tape and then tested the dryer - it worked perfectly. The part from Part Select was ordered and shipped very quickly. Since the sheet metal screws holding the sensor on were difficult to access with the drum in place, I used small machine screws/nuts to fasten the sensor - this allowed me to tighten the nuts from the outside of the dryer, making it very easy to attach.