Export thread

Cub Cadet 1515 Low Power when PTO Engaged

#1

C

CubCadet_Chris

My Neighbor was nice enough to give me his old yard tractor. Its a Cub Cadet 1515 from the 2000's era. It has plenty of power with the PTO disengage. But when the PTO is engaged it bogs down more than it should. RPMs drop to about 2300rpm. Could the PTO be worn out and causing extra load on the engine? I think its electromagnetic so maybe not? Thanks in advance for any suggestions.


#2

B

bertsmobile1

First thing to do is check the governor and make sure it is working.
When the PTo is engaged you should see the throttle linkage move to open up the carb butterfly


#3

C

CubCadet_Chris

bertsmobile1 said:
First thing to do is check the governor and make sure it is working.
When the PTo is engaged you should see the throttle linkage move to open up the carb butterfly
Click to expand...
I don't see the governor lever move when I engage the PTO. Could I possibly have the spring in the wrong linkage hole?

Attachments





#4

G

guyina4x4

if you haven't changed anything with the governor I'd leave it alone.
dirty carb will cause low power under load. as will any fuel system problem


#5

C

CubCadet_Chris

I probably messed it up by accident when I pulled the motor out to replace the head gasket. It didnt have power when I got it because of the bad head gasket. Now it runs good and cool, but just looses power under load. When I was messing with the governor lever after Bertsmobile gave me the idea it would pick up more RPM and spin the blades faster so that is what I need. I guess I need help how to setup the governor as the spring doesn't have any kind of tension.


#6

C

CubCadet_Chris

So after some tinkering I dont think its a low power issue. I think I have the throttle cable and governor not setup right after I pulled the engine for the headgasket. I cant seem to get the throttle cable set right. I can't get it set to max the RPMs to 3600 and get the idle position to go all the way to idle. It bottoms out about halfway. Anybody know how I should reset these?


#7

R

Rivets

Please post the engine numbers off the ID tag.


#8

C

CubCadet_Chris

Rivets said:
Please post the engine numbers off the ID tag.
Click to expand...
Picking this back up. Got sidetracked with some trips. Here are the engine tags. Thanks in advance for any help!

Attachments







#9

R

Rivets

Section 5 of this manual should answer most of your questions. https://www.mymowerparts.com/pdf/Ko...13-CV14-CV15-CV16-CV460-CV465-CV490-CV495.pdf


#10

C

CubCadet_Chris

Thank you so much! I will keep posted what I figure out when I get a moment to tinker. :)


#11

C

CubCadet_Chris

I set everything up per the manual. And I didn't notice any improvement. Im starting to think this is a lost cause. I have a tach that counts spark plug pulse.

At full throttle no load its running around 4000-4100RPM.
At full throttle driving no PTO its running around 3700RPM
At full throttle driving with PTO its running about 2400RPM

So the governor isn't keeping the speed up. Its got plenty of power until the PTO is engaged. Here are some pics the the current setup.

Capture1.JPG
Capture2.JPG
Capture3.JPG

The engine manual shows the following. Whats interesting is that it shows the throttle cable in all the positions connected to inner (smaller) lever and shows the choke cable in all the positions connected to the half moon lever. This is wrong according to my lawnmower.
Capture4.JPG

Any other ideas what I can try next? Thank you for the help!


#12

B

bertsmobile1

I seriously doubt that the diagram is wrong
What does happen is people hook the control rods to the wrong butterflys
This is very common .
Remove your control cables then move the high idle screw and see which arm moves
That arm is the one which should be connected to the governor arm via a spring
The other one should go directly to the choke butterfly which is the one closest to the air filter.


#13

C

CubCadet_Chris

When I was looking at the diagram, I had the same thought that maybe I too swapped the cables by accident.

I checked this and the throttle cable moves the arm that controls the butterfly valve that is connected to the governor. The choke moves the butterfly valve closest to the air filter.

I even tested this. Running at full throttle and engine warmed up if I move the choke ever so slightly it cuts air supply off and almost kills the engine.

Im pretty confident I have these connected to the right butterfly valves.

My pics attached in the post above are my current setup as described here in this post so I really do think they flipped flopped their labeling.


#14

B

bertsmobile1

To work, the throttle has to pull on the governor spring and nothing else.
It is the balance between the tension in the governor spring and the pressure from the governor that works against that spring that actually controls the engine speed.
The throttle cable simply controls the tension in the spring not the butterfly directly .


#15

C

CubCadet_Chris

Thanks! The throttle cable does move the governor lever which tensions up the governor spring. But there is definitely no governor movement under load or really any condition. Ill see if I can post a video later.


#16

B

bertsmobile1

CubCadet_Chris said:
Thanks! The throttle cable does move the governor lever which tensions up the governor spring. But there is definitely no governor movement under load or really any condition. Ill see if I can post a video later.
Click to expand...
You have it connected wrong
The throttle cabe can not be connected directly to the throttle butterfly because that prevents the governor moving the butterfly without moving the throttle cable which it is not strong enough to do .


#17

S

slomo

Rivets said:
Section 5 of this manual should answer most of your questions. https://www.mymowerparts.com/pdf/Ko...13-CV14-CV15-CV16-CV460-CV465-CV490-CV495.pdf
Click to expand...
Sections 3, 4, 6 and 1 look juicy too.

slomo


#18

S

slomo

CubCadet_Chris said:
I set everything up per the manual. And I didn't notice any improvement. Im starting to think this is a lost cause. I have a tach that counts spark plug pulse.

At full throttle no load its running around 4000-4100RPM.
At full throttle driving no PTO its running around 3700RPM
At full throttle driving with PTO its running about 2400RPM

So the governor isn't keeping the speed up. Its got plenty of power until the PTO is engaged. Here are some pics the the current setup.

View attachment 57124
View attachment 57125
View attachment 57126

The engine manual shows the following. Whats interesting is that it shows the throttle cable in all the positions connected to inner (smaller) lever and shows the choke cable in all the positions connected to the half moon lever. This is wrong according to my lawnmower.
View attachment 57127

Any other ideas what I can try next? Thank you for the help!
Click to expand...
Is this an LS-1 Chevy engine?

4100 revs is getting up there. Might want to keep her under 3600rpm.

Page 5.14 to 5.20 in your pdf talks about the governor settings.

slomo


#19

C

CubCadet_Chris

bertsmobile1 said:
You have it connected wrong
The throttle cabe can not be connected directly to the throttle butterfly because that prevents the governor moving the butterfly without moving the throttle cable which it is not strong enough to do .
Click to expand...
From the pics I have attached to this thread, would you be able to mark up or point to where I need to move the throttle cable too? Thank you


#20

C

CubCadet_Chris

slomo said:
Is this an LS-1 Chevy engine?

4100 revs is getting up there. Might want to keep her under 3600rpm.

Page 5.14 to 5.20 in your pdf talks about the governor settings.

slomo
Click to expand...
I went thru that. Im confused by the diagram on page 5.18 because it doesnt match my control plate.

Yeah I know its over speeding a bit, but with a load its way under rpms so Im not really letting it overspeed too much. Ill turn it down once I can figure out this governor issue.


Footer Links 1

Top