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Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 2150
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: 1 year ago.
Category: Small Engine
Expert:  Donald replied 1 year 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 1 year ago.
Gravely ZT1640 B&S model #915034
Expert:  Donald replied 1 year ago.
Can you give me just a minute or two, to see if I can pull up a diagram of your mower?
Customer: replied 1 year ago.
yes
Expert:  Donald replied 1 year ago.
Thanks ...
Expert:  Donald replied 1 year ago.
Thank you for waiting. Do you have a 12 volt test light, or a multimeter, to check for voltage?
Customer: replied 1 year ago.
yes, multimeter
Expert:  Donald replied 1 year 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 1 year ago.
No
Expert:  Donald replied 1 year ago.
This problem occurred after you replace your old clutch?
Customer: replied 1 year ago.
I think it might've occurred when the old clutch went out
Expert:  Donald replied 1 year 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 1 year ago.
Are you familiar with diodes? I noticed that you have a diode in your wire.
Customer: replied 1 year ago.
12.6
Customer: replied 1 year ago.
I know what they are...that's about it.
Expert:  Donald replied 1 year ago.
So you are getting 12.6 volts, but your clutch is not clicking?
Customer: replied 1 year ago.
Correct, but when running the rpms drop temporarily when the pto is engaged
Expert:  Donald replied 1 year 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 1 year ago.
the wires that are attached to the clutch and plug into the purple/white wire?
Expert:  Donald replied 1 year ago.
Do you see a heavy rubber coating around any point on your wire?
Customer: replied 1 year ago.
you can't see the wires they are under a yellow protective covering
Expert:  Donald replied 1 year ago.
Your diode is likely under the yellow covering.
Customer: replied 1 year ago.
the clutch is brand new?
Expert:  Donald replied 1 year ago.
I am sure your clutch is just fine. Have you had a need to jump start your engine recently?
Customer: replied 1 year ago.
No, are we talking about the wires attached to the clutch?
Expert:  Donald replied 1 year ago.
That was just a troubleshooting question.
Customer: replied 1 year ago.
the only diode I can find goes to the stator
Expert:  Donald replied 1 year ago.
Ok ...Can you set your meter to check continuity? We need to determine if your black wire has continuity.
Customer: replied 1 year ago.
what black wire?
Expert:  Donald replied 1 year ago.
There should be a Purple/White wire and a Black/White wire going to your clutch.
Customer: replied 1 year ago.
correct the black wire that connects to the clutch
Expert:  Donald replied 1 year ago.
Yes that is it.
Customer: replied 1 year ago.
it does not
Expert:  Donald replied 1 year ago.
Are you saying it does not show to be grounded?
Customer: replied 1 year ago.
nothing changes on the meter when I check continuity
Customer: replied 1 year ago.
the key is off, correct?
Expert:  Donald replied 1 year ago.
You have a start relay on your mower.
Expert:  Donald replied 1 year ago.
Check with key on.
Customer: replied 1 year ago.
004 reading with key on
Expert:  Donald replied 1 year ago.
The ground for your clutch comes from your start relay.
Expert:  Donald replied 1 year ago.
Check to see if you can locate your relay.
Customer: replied 1 year ago.
the 4 prong black box that the battery wire goes to then from there to starter?
Customer: replied 1 year ago.
no i'm thinking of the solenoid
Expert:  Donald replied 1 year ago.
If you like, I can get an image of a relay for you.
Customer: replied 1 year ago.
i'm googling it
Expert:  Donald replied 1 year ago.
Thanks - Click Here
Customer: replied 1 year ago.
that didn't work...
Expert:  Donald replied 1 year ago.
I will try again.
Customer: replied 1 year ago.
I keep getting pictures of the solenoid from google
Expert:  Donald replied 1 year ago.
Click Here
Customer: replied 1 year ago.
no, I see nothing that looks like that
Expert:  Donald replied 1 year ago.
Based upon your wiring schematic, you have a start relay in your electrical system.
Customer: replied 1 year ago.
separate from the solenoid?
Expert:  Donald replied 1 year ago.
Yes it is ...
Customer: replied 1 year ago.
could it be in with the key switch?
Expert:  Donald replied 1 year ago.
It will be in the area of your parking brake switch.
Expert:  Donald replied 1 year ago.
There is a Yellow/Red wire that goes from your parking brake switch, to your solenoid.
Customer: replied 1 year ago.
It was I found it
Expert:  Donald replied 1 year ago.
Great!
Customer: replied 1 year ago.
I see the yellow and red wire at the relay
Expert:  Donald replied 1 year ago.
***I meant to say from your parking brake switch to your relay***
Expert:  Donald replied 1 year ago.
This wire should have voltage, when your switch is on, but someone has to be sitting in your seat.
Expert:  Donald replied 1 year ago.
Are you familiar with using jumper wires?
Expert:  Donald replied 1 year ago.
If so, you can unplug the connector from your seat switch, and attach a jumper wire.
Expert:  Donald replied 1 year ago.
The jumper wire will prevent you from having to be in your seat, while we are testing for voltage.
Customer: replied 1 year ago.
Yes I was able to do it 12.6 volts
Expert:  Donald replied 1 year ago.
Did you check your wire close to your relay?
Customer: replied 1 year ago.
I unplugged the relay and checked the plug then plugged it in and checked it at the e brake
Expert:  Donald replied 1 year ago.
Thank you for checking. Can you hear your relay click?
Customer: replied 1 year ago.
nope
Expert:  Donald replied 1 year ago.
When voltage is applied to your relay, it should be click.
Customer: replied 1 year ago.
I even put the old clutch back on...no click either
Expert:  Donald replied 1 year ago.
If your relay is not working, then your clutch will not work either.
Expert:  Donald replied 1 year ago.
Either your relay is bad, or it has lost its ground.
Customer: replied 1 year ago.
ok...relay is good or it would get power to the e brake tho, right?
Expert:  Donald replied 1 year ago.
The power for your relay comes from your brake switch.
Expert:  Donald replied 1 year ago.
your mower has a ground fuse that could be blown.
Expert:  Donald replied 1 year ago.
If this fuse is blown, your relay will not work.
Expert:  Donald replied 1 year ago.
I can help you locate this fuse ...
Expert:  Donald replied 1 year ago.
There is a black wire that goes from your headlight, to your ground path fuse.
Customer: replied 1 year ago.
Fuses are good
Expert:  Donald replied 1 year 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 1 year ago.
No, but I replaced both of them...
Expert:  Donald replied 1 year ago.
This leads me to believe your relay is at fault. How old is your mower?
Customer: replied 1 year ago.
2003
Expert:  Donald replied 1 year ago.
Can you check for continuity at the black wire, where it enters the connector for your relay?
Expert:  Donald replied 1 year ago.
Are you familiar with wiring schematics?
Customer: replied 1 year 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 1 year ago.
You can check it with relay removed.
Expert:  Donald replied 1 year ago.
You will see a Black/White wire, and a Black wire. Check the Black wire.
Customer: replied 1 year ago.
There are 3 black wires a white and,a yellow?
Expert:  Donald replied 1 year ago.
Does any of the black wires have a white stripe?
Customer: replied 1 year ago.
No...the white wire has a black stripe
Expert:  Donald replied 1 year ago.
Check all of your black wires. Let's see how many of them has continuity.
Customer: replied 1 year ago.
Use the battery to ground?
Expert:  Donald replied 1 year ago.
Yes, good choice.
Customer: replied 1 year ago.
None of them register?
Expert:  Donald replied 1 year 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 1 year ago.
Let's focus on these two wires for now.
Customer: replied 1 year ago.
I have voltage..no continuity tho
Expert:  Donald replied 1 year ago.
Thank you for checking. Will your headlight come on?
Expert:  Donald replied 1 year ago.
Your diagram shows a headlight.
Customer: replied 1 year 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 1 year ago.
Did you run a jumper wire to Black Wire #85?
Customer: replied 1 year ago.
Yes
Expert:  Donald replied 1 year 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 1 year ago.
So I would have to plug the relay back in and run jumper wires?
Expert:  Donald replied 1 year ago.
Correct ...
Expert:  Donald replied 1 year ago.
You may need to temporarily splice in jumper wire, to Black wire #85.
Customer: replied 1 year ago.
Yes the clutch clicks!
Expert:  Donald replied 1 year ago.
Leave your jumper wire attached. Start your engine, then check to see if your blades will spin.
Expert:  Donald replied 1 year ago.
You may need to sit on your seat.
Customer: replied 1 year 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 1 year 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 1 year ago.
One of the fuses was bad when I replaced them.
Expert:  Donald replied 1 year ago.
Check that fuse holder, it could be bad as well.
Customer: replied 1 year 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 1 year 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 1 year ago.
I think it's time to take it to a shop..thx
Expert:  Donald replied 1 year ago.
You are very welcome! I do hope all goes well for you. I enjoyed working with you.