DG7400 Dryer - Instructions

Pulled the big front panel by removing two screws near bottom of front and pulling out at bottom until the top pops loose. Vacuumed out all of the dust and checked for loose connections. Ran dryer - igniter would light, but no gas. Checked the two solenoids with a VOM. the one with the two leads would intermittently read Infinity (open). Super simple repair. Remove two screws on solenoid bracket on top of the gas valve, Replace solenoid and plug it back in with the easy push-on connector. NO PROBLEM - all fixed.

Removed the screws and took the door off then took the front panel off and popped up the top. Then pulled the drum out. Took snap ring pliers and removed rollers and replaced with new rollers then vacuumed all lint from machine and reversed operation to put everything back together. Operation was a total success!

1st I pried the dryer top open then disconnected the two wires for the auto shut-off. Removed four nuts with driver that opens front and releases dryer barrel. Lifted front up a bit to remove from two lower tabs at bottom of unit and put aside.

I then slid the belt over the barrel noting the side up directions on the belt. On the lower left on the back of unit I opened up the vented cover to reveal the motor pulley and belt tension pulley. I put the belt on the pulley and brought the belt tension pulley over the belt. I then aligned the belt to the proper point on the barrel and reattached the front being careful to center the barrel onto the rim that is built into the front. Take care to align all the tabs and shims in the correct order so that barrel rotates freely. Replace auto shut off wires to switch on inside of front and close top.

Unplug the dryer and remove the front panel (two screws at bottom of the panel), being careful of the door switch wires attached to the front panel. Using an ohm meter, I checked the ignitor for continuity and found it was open (should be 50-100 ohms). Make sure to check the solenoids on the gas valve. When the igniter goes bad, it will usually burn out the valve 1 solenoid boost coil (the one with 3 terminals), which was the case with my dryer. The solenoid coils are held in by a bracket with two screws (series 01 dryer) and are easy to remove and replace. Be careful replacing the igniter as the heating element is VERY fragile. Take the time to vacuum out all of the accumulated lint and dust inside the dryer while the front panel is removed, including the lint trap and duct. New igniter and boost/hold solenoid fixed the problem.

First pry up on the front edge of the top panel of the dryer which is held in place by snap in clips. Pivot the top open and support against wall or other taking care not to pull on wiring harness. Next remove the 2 screws that hold the front panel in place. These are located on the inside of the front panel. The front then snaps loose also. Remove the plastic drum stop located at the top edge of the front of the dryer. Next I removed the 3 drum screws located inside at the back center of the dryer. Next you can you need to remove the belt the motor located at the rear vent panel on the back. Slide the now loose drum out exposing the rear bearing. With a 5/16 end wrench, loosen the 2 screws on either side of the bearing retainer. Assemble the new bearing bracket to match the old one. Apply a liberal amount of supplied lubricant to the pivot ball and plastic retainer. At this point it was helpful to have someone at the rear of the dryer hold the new retainer bracket against the back of the dryer while I tightened the new bearing assembly in. Assemble dryer in reverse.

I removed the front panel of the dryer by removing the 2 screw that secure it at the bottom and pulling upward to disconnect the cover at the top. I then removed the two screws that hold the metal cover that secures the 2 elements in place. I disconnected the wire plugs from the 2 elements, removed the 2 elements and replaced them with the new parts making sure to place them in the same positions as before. I then replaced the housing cover and tightened the screws. Then I replaced the front cover of the dryer.

I removed the front of the dryer by removing the two screws on the bottom of the front panel, disconnected the door switch wires. I removed the connectors from the coils on the gas valve, the heat sensor and the igniter. Loosened the gas line at the valve. I removed the screw holding the gas valve and burner assembly and removed the assembly from the dryer. Remover the screw holding the burner to the valve, and removed the igniter. Replaced the burned and reconnected what I had removed. The reason the burner didn't light was due to the gas deflectors being burned off of the burner, If the igniter, sensor, and coils check out OK , check the front of the burned to besure it is deflecting gas to the igniter

First of all, let me thank your wonder web site and service.


Here is the step-by-step procedure:


Unplugged the power.

Accessed the heater assembly from the front left lower corner.

Turned off the small gas valve.

Unscrewed the copper nut connecting the small gas valve and the heater assembly.

Disconnected the 3 wire connectors.

Unscrewed 2 screws under the heater assembly.

Took out the heater assembly.

Unscrewed the screw for the igniter assembly.

Installed the new igniter assembly. Be very careful with the M shaped coil. I broke a new one. That is why I have order the same part twice. But it still cost me less for hiring a tech or buying a new dryer.

Carefully put the heater assembly back into it position.

Connected the gas connector.

Secured the heater assembly to the bottom of the dryer with 2 screws.

Connected 3 wire connectors.

Turned on the small gas valve.

Plugged in and ran a test.

It worked!!.

After replacing all the other fuses and sensors I finally replaced the Radiant Flame Sensor and it is working perfectly.

After replacing the other parts and the heat still not coming on I read somewhere that the Radiant Flame Sensor is a normal closed circuit and when I checked with a meter it was open. I would have saved a lot of time and money if I had read that earlier.

My 20 year old reliable Maytag 512 lgp dryer was not heating anymore. At first the heating element would glow red but not hot enough to ignite the gas. I replaced the element and it worked for a few loads but then stopped reigniting after the first cycle.

After some research and diagnosis (checking connections, amperage flow on each electriical part, etc.) I determined that the two coils were faulty. I ordered parts and replaced them (easy to do) and it worked again, for another few loads. Then nothing worked. The coil did not get hot and I did not hear the clicking sound that initiates current flow to the ignitor through the coils.

I checked the coils and ignitor again, they were fine. Frustrated, I called in a repairman to diagnose the problem. $55 and 15 min later he narrowed it down to the High Limit Thermostat. To demonstrate he bypassed the thermostat by directly connecting the two leads together and the ignitor fired right up.

His price to replace the thermostat? $45 part plus $130 labor. I bought the thermostat online for less than half his parts cost and the labor took me 5 minutes. Simply unscrew the small screws with a small socket set or nutdriver and replace the thermostat. Just two connectors, real simple.

All in all it was very easy to replace the parts, just tricky to diagnose unless you are good with electrical work.

First I unplugged the machine. I removed the two screws in the front panel and tilted the bottom of the panel out unclipping it at the top. I removed the lint duct whichis held in place with several 1/4" hex head screws. Then I removed the blower cover, also held on wth 1/4" hex head screws, exposing the blower wheel. Using snap ring pliers I removed the snap ring at the end of the motor shaft. Using needle nose liers I removed the spring clamp around the center hub of the old blower wheel and pull the blower wheel off the motor shaft. After cleaning as much lint out as I could I put the new blower wheel on the motor, secured with spring clamp and snap ring. Then I put the blower cover and lint duct back on and put front panel back on.

Make Sure Dryer is off and disconnected from power! Also, beware of sharp edges on dryer parts and cabinet.
1) Popped-off top lid with flat-blade screw driver (Insert screw driver in joint between top and front of dryer above door) Spring clips are all that's holding top on in front
2) Unplugged plastic electrical connector located just along the top-right side of dryer
3) Removed one sheet metal screw located about 8" down from top on either side of dryer - total of two screws
4) Pull front of dryer back and pull up at bottom of dryer (Remember that when you replace front you will have to make sure plastic bearing surfaces on dryer tub are centered back in cut-out on front panel. Plastic tabs fit inside the cut-out or else you'll ge a swishing noise when tub rotates)
5) Set front panel to side
6) Flame sensor is located on the left side of the burn chamber sheet metal cover. It has a red and white wire with flat connectors that must be pulled off. Note which color goes to what terminal
7) Unscrew fastener. Note: this screw/fastener needs a non-standard driver to get it out. I have a variety of other drivers beyond phillips/flat types and non of them worked.
8) I ended up using a pair of pliers to just work it out from under the screw. I bent it, as it has a tab that slips in along left bottom edge of burn chamber cover.
9) Finish taking screw out by hand
10) Put new flame sensor in by inserting tab on bottom first. Then, screw in fastener to top of sensor bracket and reconnect wires. White on top and red on bottom terminal.
11) Replace front panel with door by placing in tabs on bottom front of dryer. Again, make sure plastic bearing surfaces are inside of circular flange on front panel
12) Make sure to reconnect plastic cable connector. Note: I added a tie-wrap because it looked like the connector might rub against drum. There are some holes through which you can run the tie-wrap
13) Replace the two sheet-metal screws
14) Push top down so spring clips re-engage with dryer body

Followed the instructions on the video, and saved 500 hundred dollars. I was already shopping for a new dryer. Thanks so much!

Instructions were great. Very step by step. It could not have been easier. Repair saved me a $100 service call.

Replacing the blower fan took way too long, like 4 hrs, because I didn't know how to disassemble the dryer and get to the problem. Replacing the idler bracket and assorted retaining rings and washers was fast, something like 1 hour. Disconnect the power cord, exhaust hose, and gas line. Remove two screws at the bottom of the face of the machine, unplug the electrical harness to the door light, switch and ground and remove the front of the machine. Remove the access panel at the back of the machine and remove the belt from the idler pulley. Remove the four screws holding the front drum support assembly and remove the drum. Replace some old retaining rings and the spring washers on the drum support rollers. Around back assemble the idler pulley assembly with some new washers and the old roller which seemed in good condition. Put it all back together. About one hour.