Model #PGT9000 CRAFTSMAN Lawn, Tractor

  • Steering/axle
    3 Results
  • Hood/dash
    3 Results
  • Seat/fender
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  • Drive/rear Wheels
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  • 49m777-0791-g1 Engine
    3 Results
  • Pto/battery
    3 Results
  • Deck
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  • Decals
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Question and Answers

Q:

PGT 9000 electric choke

A:

I know how important it is to have a good working tractor in the home to keep the grass nice and trimmed. While you are waiting for your expert answer, I am adding a link in where you can set up service. I hope my link is useful.

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Joseph P. -
September 14, 2011
A:

Unless you can find where the wire broke from to connect it back, the harness will have to be replaced. Briggs & Stratton does not publish any schematics for the EFM system that I've been able to find. This is not the first time something like this has come up for me. I'm not real sure what the situation with the wiring is unless it's that they're worried about a bad wiring repair leading to a failed EFM box and them having to make good on a part that failed due to bad wiring.

The harness that goes with the EFM box is part number 796914.

Because the wire is off, I do suspect that is causing the problem with your engine. I do know that there are no wires from the EFM unit that are not attached. I have attached the only drawing of the whole EFM system I have currently. You can kind of tell which wires go to where, but it's not in color and it does not show where they attach onto the EFM box.

I spoke a Briggs representative about this was advised that you needed to have your machine looked at by a qualified technician.

For the time being I'm going to see if we have a machine here with the EFM on it or if there is one I have access to and I'll trace the wires down and we can go from there.

Thank you for using Manage My Life!

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XX Wade_ -
Sears Technician
September 16, 2011
A:

On looking at your photo some more. The wire that's broke. Is that just wire on the end or is that a piece of solder or metal on the tip? If so, look at "D" in the drawing I attached. That could be the wire from that connection. It would make sense based on the rest of the wires with that plug. Let me know what you think. I did check and we do not have a machine with the EFM system on it here. I may be able to find one over the weekend and get some photos so we can figure this out.

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XX Wade_ -
Sears Technician
September 16, 2011
A:

Hi Wade, Thanks for the help so far. The wire originally appeared to be cut cleanly. I stripped the insulation off of the end to ground the wire to the frame as a test to see if the stepper motor responded. No luck, but nothing started smoking so maybe I am lucky. The wire looks like it difinitely is "D" in the picture that you sent. It should lead to the "Speed Input" wire. I have searched in the area that the picture shows, but no dangling wires are there. If the governor linkage had a rheostat connected somewhere, that could serve as a "speed input", telling the control module that the engine is running. Maybe the stator has a wire coming from it to tell the control module that voltage is being produced. I haven't pulled the engine apart to check. If there is a part missing (the speed sensor) I wouldn't be able to tell without knowing where it's located. So I guess I still need to know where that wire leads to. Thanks, Dave

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Dave -
September 16, 2011
A:

After looking at this some more, I believe that wire (D in my drawing) may go over and connect to the regulator. I guess it's possible that they are measuring speed based on the voltage output of the regulator. I see no other connections like that on this engine. Let me know what that looks like and in the mean time I'm going to see if I can get some solid answers from Briggs.

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XX Wade_ -
Sears Technician
September 19, 2011
A:

Hi Wade, I thought the same thing for a while. But the voltage regulator doesn't have any loose wires. Also the picture shows the wire (D) leading off to the right, below the carburetor. The voltage regulator is located to the left, the wrong direction. I contacted Briggs and Stratton and they explained that there was no wiring diagram for that engine. They referred me to a local lawnmower shop which turned out to be voicemail " I will call you back". I doubt if they are going to know any more than we do, unless they have a PGT 9000 in for repair. So how does Briggs and Stratton assemble these engines if they don't have wiring diagrams? Thanks, Dave

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Dave -
September 19, 2011
A:

I noticed the same thing with the wire going off in the other direction. My line of thinking was that maybe it was just drawn like that. I'm still working on this and won't just put it aside. None of the tractors we have on hand have that fuel management system on them. I emailed Briggs yesterday to see if they can tell me anything. I will contact one of the Sears stores here to see if they have one in their store and if so I will see if I can get by there and trace the wires to where they go.

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XX Wade_ -
Sears Technician
September 20, 2011
A:

The wire in question goes into a plug and joins 2 other wires and then moves off to the engine harness and is the "kill" wire. The "kill" wire from the ignition coil(s) should join with the wire in question. I don't know where this connection takes place. One of our technical advisors got his hands on an engine like yours and drew up a rough diagram of it. I have attached his drawing to this post. I need to get it in a program to clean it up, but I wanted to get this to you now as it will take me some time before I'm able to make it more presentable. The black wire in question is on the same plug as the wires to the step motor but does not go to the step motor.

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XX Wade_ -
Sears Technician
September 20, 2011
A:

Hi Wade, The diagram was cropped by the copy machine and cut off a lot of info, but it clearly shows the wire (D) connecting to the kill circuit. I think I'll be able to track it down. Thanks for all your work Dave

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Dave -
September 20, 2011
A:

Hi Wade, With your help, I tracked down the broken wire and reconnected the wire (D) from the stepper motor harness. The choke now opens fully as soon as the engine starts. So I can untie the string that I used to pull to open the choke. So this brings me back to why the previous owner was messing with it in the first place. The choke opening isn't proportional to the engine temperature. It opens wide immediately, causing the idle to surge because the fuel mixture is too lean for the engine temperature. I can live with that; it only does that for about a minute. But now that I'm heartened by a recent victory, I'm looking for a clean sweep. I will assume that the stepper motor is OK because it initializes, closes and opens. This leaves the thermistor and the EFM module as suspects. If the thermistor is a PTC (positive temperature coefficient) thermistor, the resistance increases with the temperature. So if the thermistor circuit has a break, or the thermistor is defective, the resistance is infinite, and the EFM module would think that the engine is totally warmed up and would tell the stepper motor to open the choke wide. So if I short across the thermistor contacts, the EFM module would think that the engine is totally cold, and would tell the stepper motor to partially close the choke. If that occurs during this test, it indicates that the thermistor isn't doing it's job, and I'll replace it. I'll let you know how it goes. Thanks, Dave

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Dave -
September 22, 2011
See more answers
Q:

PGT9000 Fuses? 247289841

A:

Thanks for the inquiry and for being a valued member.

I am sorry to hear of the issue you're having with the tractor. I know how frustrating that is. 

The wiring diagram shows only one fuse for this model. It's a 20 amp fuse and it's between the starter solenoid and the ignition switch. If you trace the small red wire from the solenoid to the ignition switch, you will be able to locate it. It may be located within a fuse holder. 

I do not see a part number for the fuse, as it appears to be part of the wiring harness, but if you pull it out, you should be able to match it up at an automotive shop or small engine repair shop.

I hope this helps and thanks for using SearsPartsDirect.com. We appreciate your business. 

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Jeff Wallace Sr -
Sears Technician
July 14, 2015
Q:

PTO Relay on PGT 9000 PGT9000 Craftsman Tractor

A:

Thank you for choosing Sears Parts Direct. I will be happy to help with your riding tractor. Upon researching model number PGT9000; the pto switch can be tested for continuity and 12v. Check the amount of power going to the clutch from the switch. Power can be traced back to the part that is shorting or malfunctioning.

Thank you for choosing Sears. We appreciate your business. Have a great day.

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Jeff Wallace Jr -
Sears Technician
June 29, 2015

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