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Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1805
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: 8 months ago.
Category: Small Engine
Expert:  Donald replied 8 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 8 months ago.
Gravely ZT1640 B&S model #915034
Expert:  Donald replied 8 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 8 months ago.
yes
Expert:  Donald replied 8 months ago.
Thanks ...
Expert:  Donald replied 8 months ago.
Thank you for waiting. Do you have a 12 volt test light, or a multimeter, to check for voltage?
Customer: replied 8 months ago.
yes, multimeter
Expert:  Donald replied 8 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 8 months ago.
No
Expert:  Donald replied 8 months ago.
This problem occurred after you replace your old clutch?
Customer: replied 8 months ago.
I think it might've occurred when the old clutch went out
Expert:  Donald replied 8 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 8 months ago.
Are you familiar with diodes? I noticed that you have a diode in your wire.
Customer: replied 8 months ago.
12.6
Customer: replied 8 months ago.
I know what they are...that's about it.
Expert:  Donald replied 8 months ago.
So you are getting 12.6 volts, but your clutch is not clicking?
Customer: replied 8 months ago.
Correct, but when running the rpms drop temporarily when the pto is engaged
Expert:  Donald replied 8 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 8 months ago.
the wires that are attached to the clutch and plug into the purple/white wire?
Expert:  Donald replied 8 months ago.
Do you see a heavy rubber coating around any point on your wire?
Customer: replied 8 months ago.
you can't see the wires they are under a yellow protective covering
Expert:  Donald replied 8 months ago.
Your diode is likely under the yellow covering.
Customer: replied 8 months ago.
the clutch is brand new?
Expert:  Donald replied 8 months ago.
I am sure your clutch is just fine. Have you had a need to jump start your engine recently?
Customer: replied 8 months ago.
No, are we talking about the wires attached to the clutch?
Expert:  Donald replied 8 months ago.
That was just a troubleshooting question.
Customer: replied 8 months ago.
the only diode I can find goes to the stator
Expert:  Donald replied 8 months ago.
Ok ...Can you set your meter to check continuity? We need to determine if your black wire has continuity.
Customer: replied 8 months ago.
what black wire?
Expert:  Donald replied 8 months ago.
There should be a Purple/White wire and a Black/White wire going to your clutch.
Customer: replied 8 months ago.
correct the black wire that connects to the clutch
Expert:  Donald replied 8 months ago.
Yes that is it.
Customer: replied 8 months ago.
it does not
Expert:  Donald replied 8 months ago.
Are you saying it does not show to be grounded?
Customer: replied 8 months ago.
nothing changes on the meter when I check continuity
Customer: replied 8 months ago.
the key is off, correct?
Expert:  Donald replied 8 months ago.
You have a start relay on your mower.
Expert:  Donald replied 8 months ago.
Check with key on.
Customer: replied 8 months ago.
004 reading with key on
Expert:  Donald replied 8 months ago.
The ground for your clutch comes from your start relay.
Expert:  Donald replied 8 months ago.
Check to see if you can locate your relay.
Customer: replied 8 months ago.
the 4 prong black box that the battery wire goes to then from there to starter?
Customer: replied 8 months ago.
no i'm thinking of the solenoid
Expert:  Donald replied 8 months ago.
If you like, I can get an image of a relay for you.
Customer: replied 8 months ago.
i'm googling it
Expert:  Donald replied 8 months ago.
Thanks - Click Here
Customer: replied 8 months ago.
that didn't work...
Expert:  Donald replied 8 months ago.
I will try again.
Customer: replied 8 months ago.
I keep getting pictures of the solenoid from google
Expert:  Donald replied 8 months ago.
Click Here
Customer: replied 8 months ago.
no, I see nothing that looks like that
Expert:  Donald replied 8 months ago.
Based upon your wiring schematic, you have a start relay in your electrical system.
Customer: replied 8 months ago.
separate from the solenoid?
Expert:  Donald replied 8 months ago.
Yes it is ...
Customer: replied 8 months ago.
could it be in with the key switch?
Expert:  Donald replied 8 months ago.
It will be in the area of your parking brake switch.
Expert:  Donald replied 8 months ago.
There is a Yellow/Red wire that goes from your parking brake switch, to your solenoid.
Customer: replied 8 months ago.
It was I found it
Expert:  Donald replied 8 months ago.
Great!
Customer: replied 8 months ago.
I see the yellow and red wire at the relay
Expert:  Donald replied 8 months ago.
***I meant to say from your parking brake switch to your relay***
Expert:  Donald replied 8 months ago.
This wire should have voltage, when your switch is on, but someone has to be sitting in your seat.
Expert:  Donald replied 8 months ago.
Are you familiar with using jumper wires?
Expert:  Donald replied 8 months ago.
If so, you can unplug the connector from your seat switch, and attach a jumper wire.
Expert:  Donald replied 8 months ago.
The jumper wire will prevent you from having to be in your seat, while we are testing for voltage.
Customer: replied 8 months ago.
Yes I was able to do it 12.6 volts
Expert:  Donald replied 8 months ago.
Did you check your wire close to your relay?
Customer: replied 8 months ago.
I unplugged the relay and checked the plug then plugged it in and checked it at the e brake
Expert:  Donald replied 8 months ago.
Thank you for checking. Can you hear your relay click?
Customer: replied 8 months ago.
nope
Expert:  Donald replied 8 months ago.
When voltage is applied to your relay, it should be click.
Customer: replied 8 months ago.
I even put the old clutch back on...no click either
Expert:  Donald replied 8 months ago.
If your relay is not working, then your clutch will not work either.
Expert:  Donald replied 8 months ago.
Either your relay is bad, or it has lost its ground.
Customer: replied 8 months ago.
ok...relay is good or it would get power to the e brake tho, right?
Expert:  Donald replied 8 months ago.
The power for your relay comes from your brake switch.
Expert:  Donald replied 8 months ago.
your mower has a ground fuse that could be blown.
Expert:  Donald replied 8 months ago.
If this fuse is blown, your relay will not work.
Expert:  Donald replied 8 months ago.
I can help you locate this fuse ...
Expert:  Donald replied 8 months ago.
There is a black wire that goes from your headlight, to your ground path fuse.
Customer: replied 8 months ago.
Fuses are good
Expert:  Donald replied 8 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 8 months ago.
No, but I replaced both of them...
Expert:  Donald replied 8 months ago.
This leads me to believe your relay is at fault. How old is your mower?
Customer: replied 8 months ago.
2003
Expert:  Donald replied 8 months ago.
Can you check for continuity at the black wire, where it enters the connector for your relay?
Expert:  Donald replied 8 months ago.
Are you familiar with wiring schematics?
Customer: replied 8 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 8 months ago.
You can check it with relay removed.
Expert:  Donald replied 8 months ago.
You will see a Black/White wire, and a Black wire. Check the Black wire.
Customer: replied 8 months ago.
There are 3 black wires a white and,a yellow?
Expert:  Donald replied 8 months ago.
Does any of the black wires have a white stripe?
Customer: replied 8 months ago.
No...the white wire has a black stripe
Expert:  Donald replied 8 months ago.
Check all of your black wires. Let's see how many of them has continuity.
Customer: replied 8 months ago.
Use the battery to ground?
Expert:  Donald replied 8 months ago.
Yes, good choice.
Customer: replied 8 months ago.
None of them register?
Expert:  Donald replied 8 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 8 months ago.
Let's focus on these two wires for now.
Customer: replied 8 months ago.
I have voltage..no continuity tho
Expert:  Donald replied 8 months ago.
Thank you for checking. Will your headlight come on?
Expert:  Donald replied 8 months ago.
Your diagram shows a headlight.
Customer: replied 8 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 8 months ago.
Did you run a jumper wire to Black Wire #85?
Customer: replied 8 months ago.
Yes
Expert:  Donald replied 8 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 8 months ago.
So I would have to plug the relay back in and run jumper wires?
Expert:  Donald replied 8 months ago.
Correct ...
Expert:  Donald replied 8 months ago.
You may need to temporarily splice in jumper wire, to Black wire #85.
Customer: replied 8 months ago.
Yes the clutch clicks!
Expert:  Donald replied 8 months ago.
Leave your jumper wire attached. Start your engine, then check to see if your blades will spin.
Expert:  Donald replied 8 months ago.
You may need to sit on your seat.
Customer: replied 8 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 8 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 8 months ago.
One of the fuses was bad when I replaced them.
Expert:  Donald replied 8 months ago.
Check that fuse holder, it could be bad as well.
Customer: replied 8 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 8 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 8 months ago.
I think it's time to take it to a shop..thx
Expert:  Donald replied 8 months ago.
You are very welcome! I do hope all goes well for you. I enjoyed working with you.

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