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Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1919
Experience:  I have 25+ years of experience repairing 2 & 4 cycle engines
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I've replaced my electric clutch, PTO switch and checked the

Customer Question

I've replaced my electric clutch, PTO switch and checked the battery 12.7 volts and my blades will not engage, although, when pulling the PTO up the engines rpm drop for a second?
JA: I'll do all I can to help. Tell me a bit more about what's going on so we can help you best.
Customer: my electric clutch started making a metal to metal sound, so I bought a new one and now it it won't engae the blades
JA: Anything else I can tell the Small Engine Technician before I connect you two?
Customer: nope
JA: I'm sending you to a secure page on JustAnswer so you can place the $5 fully refundable deposit now. While you're filling out that form, I'll tell the Small Engine Technician about your situation and connect you two.
Submitted: 11 months ago.
Category: Small Engine
Expert:  Donald replied 11 months ago.
Hello, and thank you for choosing Just Answer. My name is***** will be happy to assist you. What is the brand, and model numbers for your mower?
Customer: replied 11 months ago.
Gravely ZT1640 B&S model #915034
Expert:  Donald replied 11 months ago.
Can you give me just a minute or two, to see if I can pull up a diagram of your mower?
Customer: replied 11 months ago.
yes
Expert:  Donald replied 11 months ago.
Thanks ...
Expert:  Donald replied 11 months ago.
Thank you for waiting. Do you have a 12 volt test light, or a multimeter, to check for voltage?
Customer: replied 11 months ago.
yes, multimeter
Expert:  Donald replied 11 months ago.
Great! We need to determine if you are getting voltage to your pto clutch? If you turn your ignition switch to on position, then turn your pto switch on, can your hear your pto clutch click?
Customer: replied 11 months ago.
No
Expert:  Donald replied 11 months ago.
This problem occurred after you replace your old clutch?
Customer: replied 11 months ago.
I think it might've occurred when the old clutch went out
Expert:  Donald replied 11 months ago.
There is a Purple/White wire and a Black wire that attaches to your pto clutch. Can you use your meter to check for voltage on your Purple/White wire, with your ignition switch in on position, and your pto switch on? Also check for burned wires, while you are there.
Expert:  Donald replied 11 months ago.
Are you familiar with diodes? I noticed that you have a diode in your wire.
Customer: replied 11 months ago.
12.6
Customer: replied 11 months ago.
I know what they are...that's about it.
Expert:  Donald replied 11 months ago.
So you are getting 12.6 volts, but your clutch is not clicking?
Customer: replied 11 months ago.
Correct, but when running the rpms drop temporarily when the pto is engaged
Expert:  Donald replied 11 months ago.
This leads me to believe that your diode has failed. Look closely at the two wires that goes to your clutch. One of the wires will have a diode. It will appear as a bump in your wire.
Customer: replied 11 months ago.
the wires that are attached to the clutch and plug into the purple/white wire?
Expert:  Donald replied 11 months ago.
Do you see a heavy rubber coating around any point on your wire?
Customer: replied 11 months ago.
you can't see the wires they are under a yellow protective covering
Expert:  Donald replied 11 months ago.
Your diode is likely under the yellow covering.
Customer: replied 11 months ago.
the clutch is brand new?
Expert:  Donald replied 11 months ago.
I am sure your clutch is just fine. Have you had a need to jump start your engine recently?
Customer: replied 11 months ago.
No, are we talking about the wires attached to the clutch?
Expert:  Donald replied 11 months ago.
That was just a troubleshooting question.
Customer: replied 11 months ago.
the only diode I can find goes to the stator
Expert:  Donald replied 11 months ago.
Ok ...Can you set your meter to check continuity? We need to determine if your black wire has continuity.
Customer: replied 11 months ago.
what black wire?
Expert:  Donald replied 11 months ago.
There should be a Purple/White wire and a Black/White wire going to your clutch.
Customer: replied 11 months ago.
correct the black wire that connects to the clutch
Expert:  Donald replied 11 months ago.
Yes that is it.
Customer: replied 11 months ago.
it does not
Expert:  Donald replied 11 months ago.
Are you saying it does not show to be grounded?
Customer: replied 11 months ago.
nothing changes on the meter when I check continuity
Customer: replied 11 months ago.
the key is off, correct?
Expert:  Donald replied 11 months ago.
You have a start relay on your mower.
Expert:  Donald replied 11 months ago.
Check with key on.
Customer: replied 11 months ago.
004 reading with key on
Expert:  Donald replied 11 months ago.
The ground for your clutch comes from your start relay.
Expert:  Donald replied 11 months ago.
Check to see if you can locate your relay.
Customer: replied 11 months ago.
the 4 prong black box that the battery wire goes to then from there to starter?
Customer: replied 11 months ago.
no i'm thinking of the solenoid
Expert:  Donald replied 11 months ago.
If you like, I can get an image of a relay for you.
Customer: replied 11 months ago.
i'm googling it
Expert:  Donald replied 11 months ago.
Thanks - Click Here
Customer: replied 11 months ago.
that didn't work...
Expert:  Donald replied 11 months ago.
I will try again.
Customer: replied 11 months ago.
I keep getting pictures of the solenoid from google
Expert:  Donald replied 11 months ago.
Click Here
Customer: replied 11 months ago.
no, I see nothing that looks like that
Expert:  Donald replied 11 months ago.
Based upon your wiring schematic, you have a start relay in your electrical system.
Customer: replied 11 months ago.
separate from the solenoid?
Expert:  Donald replied 11 months ago.
Yes it is ...
Customer: replied 11 months ago.
could it be in with the key switch?
Expert:  Donald replied 11 months ago.
It will be in the area of your parking brake switch.
Expert:  Donald replied 11 months ago.
There is a Yellow/Red wire that goes from your parking brake switch, to your solenoid.
Customer: replied 11 months ago.
It was I found it
Expert:  Donald replied 11 months ago.
Great!
Customer: replied 11 months ago.
I see the yellow and red wire at the relay
Expert:  Donald replied 11 months ago.
***I meant to say from your parking brake switch to your relay***
Expert:  Donald replied 11 months ago.
This wire should have voltage, when your switch is on, but someone has to be sitting in your seat.
Expert:  Donald replied 11 months ago.
Are you familiar with using jumper wires?
Expert:  Donald replied 11 months ago.
If so, you can unplug the connector from your seat switch, and attach a jumper wire.
Expert:  Donald replied 11 months ago.
The jumper wire will prevent you from having to be in your seat, while we are testing for voltage.
Customer: replied 11 months ago.
Yes I was able to do it 12.6 volts
Expert:  Donald replied 11 months ago.
Did you check your wire close to your relay?
Customer: replied 11 months ago.
I unplugged the relay and checked the plug then plugged it in and checked it at the e brake
Expert:  Donald replied 11 months ago.
Thank you for checking. Can you hear your relay click?
Customer: replied 11 months ago.
nope
Expert:  Donald replied 11 months ago.
When voltage is applied to your relay, it should be click.
Customer: replied 11 months ago.
I even put the old clutch back on...no click either
Expert:  Donald replied 11 months ago.
If your relay is not working, then your clutch will not work either.
Expert:  Donald replied 11 months ago.
Either your relay is bad, or it has lost its ground.
Customer: replied 11 months ago.
ok...relay is good or it would get power to the e brake tho, right?
Expert:  Donald replied 11 months ago.
The power for your relay comes from your brake switch.
Expert:  Donald replied 11 months ago.
your mower has a ground fuse that could be blown.
Expert:  Donald replied 11 months ago.
If this fuse is blown, your relay will not work.
Expert:  Donald replied 11 months ago.
I can help you locate this fuse ...
Expert:  Donald replied 11 months ago.
There is a black wire that goes from your headlight, to your ground path fuse.
Customer: replied 11 months ago.
Fuses are good
Expert:  Donald replied 11 months ago.
There are two fuses. One for your voltage circuit, and one for your ground path. Did you test both with your meter?
Customer: replied 11 months ago.
No, but I replaced both of them...
Expert:  Donald replied 11 months ago.
This leads me to believe your relay is at fault. How old is your mower?
Customer: replied 11 months ago.
2003
Expert:  Donald replied 11 months ago.
Can you check for continuity at the black wire, where it enters the connector for your relay?
Expert:  Donald replied 11 months ago.
Are you familiar with wiring schematics?
Customer: replied 11 months ago.
Check the black wire at the connector? While plugged into the relay or unplug and ck?
Not really good with wiring in general
Expert:  Donald replied 11 months ago.
You can check it with relay removed.
Expert:  Donald replied 11 months ago.
You will see a Black/White wire, and a Black wire. Check the Black wire.
Customer: replied 11 months ago.
There are 3 black wires a white and,a yellow?
Expert:  Donald replied 11 months ago.
Does any of the black wires have a white stripe?
Customer: replied 11 months ago.
No...the white wire has a black stripe
Expert:  Donald replied 11 months ago.
Check all of your black wires. Let's see how many of them has continuity.
Customer: replied 11 months ago.
Use the battery to ground?
Expert:  Donald replied 11 months ago.
Yes, good choice.
Customer: replied 11 months ago.
None of them register?
Expert:  Donald replied 11 months ago.
Thank you for checking. Remove your relay, and look at the bottom of it. You will see some numbers. Look for numbers 85 and 86. 86 = Yellow/Red wire with voltage.85 = Black wire with fuse.Check wire 85 for continuity.Check wire 86 for voltage.
Expert:  Donald replied 11 months ago.
Let's focus on these two wires for now.
Customer: replied 11 months ago.
I have voltage..no continuity tho
Expert:  Donald replied 11 months ago.
Thank you for checking. Will your headlight come on?
Expert:  Donald replied 11 months ago.
Your diagram shows a headlight.
Customer: replied 11 months ago.
I do not have headlights....mower starts up n runs fine tho.
I used jumper wires from battery to relay it clicks but when I check for continuing nothing?
Expert:  Donald replied 11 months ago.
Did you run a jumper wire to Black Wire #85?
Customer: replied 11 months ago.
Yes
Expert:  Donald replied 11 months ago.
With the jumper wire in place, turn your ignition switch to on position, then turn your pto switch on. Listen to hear if your pto clutch clicks.
Customer: replied 11 months ago.
So I would have to plug the relay back in and run jumper wires?
Expert:  Donald replied 11 months ago.
Correct ...
Expert:  Donald replied 11 months ago.
You may need to temporarily splice in jumper wire, to Black wire #85.
Customer: replied 11 months ago.
Yes the clutch clicks!
Expert:  Donald replied 11 months ago.
Leave your jumper wire attached. Start your engine, then check to see if your blades will spin.
Expert:  Donald replied 11 months ago.
You may need to sit on your seat.
Customer: replied 11 months ago.
Ok...I don't have anyone to help with that right now...I'll get back to you later...if it does would that mean the relay is bad?
Expert:  Donald replied 11 months ago.
This would mean your relay is good, but you are losing ground, somewhere along your ground path. It could be a bad or corroded fuse holder. I am referring to the fuse you replaced, that plugs into the fuse holder with black wires.
Customer: replied 11 months ago.
One of the fuses was bad when I replaced them.
Expert:  Donald replied 11 months ago.
Check that fuse holder, it could be bad as well.
Customer: replied 11 months ago.
I found someone to sit on the seat but now when I hook up the jumper wire it blows the fuse and the mower just cranks won't fire...with new fuse installed of course
Expert:  Donald replied 11 months ago.
Thank you for checking. This indicates that the diode in the wiring connector for your pto clutch is bad. This what likely caused your fuse to initially blow, at the time when you first found one good fuse, and one blown fuse.
Customer: replied 11 months ago.
I think it's time to take it to a shop..thx
Expert:  Donald replied 11 months ago.
You are very welcome! I do hope all goes well for you. I enjoyed working with you.