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1998 MTD Yard Man HN 7180

#1

F

Felicity

Hi everyone,
Does anybody out there own a similar lawn tractor and can advise me on the PTO clutch area please ?. The shaft on the right of my photo is a puzzle - is it the right part and what is its purpose? Presently it is angled to the front of my machine and is not in contact with anything. The top of the PTO clutch pictured, which has the wiring socket, rotates until it strikes a pulley - something is amiss here.

Many thanks for your help - a photo of your machine's PTO clutch area would be brilliant.

020.jpg


#2

M

mechanic mark

MODEL 791 THRU 798 (ELECTRIC PTO ONLY) (FG449_0170) Could not locate a good picture, click on PTO assembly to enlarge. The picture you posted was good, everything looks to be in order. Is your PTO clutch engaging & blades turning, everything working properly? Your PTO clutch assembly has a bearing in the center that turns with the crankshaft when engine is running, therefore PTO assembly remains stationary. This is a picture of current PTO clutch assembly, notice pulley is part of assembly.

Fixing Electric Clutches

https://www.google.com/webhp?source...v=2&ie=UTF-8#q=how to troubleshoot pto clutch


#3

S

shiftsuper175607

Felicity said:
Hi everyone,
Does anybody out there own a similar lawn tractor and can advise me on the PTO clutch area please ?. The shaft on the right of my photo is a puzzle - is it the right part and what is its purpose? Presently it is angled to the front of my machine and is not in contact with anything. The top of the PTO clutch pictured, which has the wiring socket, rotates until it strikes a pulley - something is amiss here.

Many thanks for your help - a photo of your machine's PTO clutch area would be brilliant.

View attachment 25989
Click to expand...

I would say that "shaft" is to keep the belt from jump off the pulley.


#4

F

Felicity

mechanic mark said:
MODEL 791 THRU 798 (ELECTRIC PTO ONLY) (FG449_0170) Could not locate a good picture, click on PTO assembly to enlarge. The picture you posted was good, everything looks to be in order. Is your PTO clutch engaging & blades turning, everything working properly? Your PTO clutch assembly has a bearing in the center that turns with the crankshaft when engine is running, therefore PTO assembly remains stationary. This is a picture of current PTO clutch assembly, notice pulley is part of assembly.

Fixing Electric Clutches

https://www.google.com/webhp?source...v=2&ie=UTF-8#q=how to troubleshoot pto clutch
Click to expand...

Thank you for your help. The clutch engages and spins the blades OK, however, the wiring to the clutch is being chafed by the pulleys - I think that it is being pulled by the clutch assembly against the pulleys as the top of the clutch (which has the wiring socket) is free to rotate until one of its arms strikes a pulley assembly. I don't think that this is correct. I suspect that the shaft, which I have refered to in my photo, should not be angled towards the front of the tractor but should be vertical to the clutch and act as both a safeguard to stop the belt slipping off and as a stop for the PTO clutch top. This is my theory to resolve what is a wiring problem but I am trying to determine exactly where the shaft should be positioned and if it should be fitted into one of the arm forks of the PTO - if only there were a diagram or photo of this area all would become clear.


#5

F

Felicity

shiftsuper175607 said:
I would say that "shaft" is to keep the belt from jump off the pulley.
Click to expand...

Thank you for your help. The clutch engages and spins the blades OK, however, the wiring to the clutch is being chafed by the pulleys - I think that it is being pulled by the clutch assembly against the pulleys as the top of the clutch (which has the wiring socket) is free to rotate until one of its arms strikes a pulley assembly. I don't think that this is correct. I suspect that the shaft, which I have refered to in my photo, should not be angled towards the front of the tractor but should be vertical to the clutch and act as both a safeguard to stop the belt slipping off and as a stop for the PTO clutch top. This is my theory to resolve what is a wiring problem but I am trying to determine exactly where the shaft should be positioned and if it should be fitted into one of the arm forks of the PTO - if only there were a diagram or photo of this area all would become clear.


#6

B

bertsmobile1

That is not the correct PTO clutch for your mower and some one has done a "Hillbilly" modification to one they had to sort of make it work or fitted a PTO to a mower that did not have one.
It would have been really nice if you had posted your model & serial numbers but such is life.
According to the ARI, MTD made 5 variations of the Yardman Lawn tractor in 1998 and none of them had an electric PTO.
The Garden tractors did have an electric PTO and there were two variations

THis is where those numbers would really have helped those who are trying to help you but I don't want to sound like I am nagging, even though I am actually nagging.

yardman.jpg
This appears to be what you have and the clutch ( No 110 ) is secured by the plate ( No 112 )

Or it could be this set up
Yardman-2.jpg

Or in this example where the clutch ( No 97 ) is secured by a different plate (No 96 )

In both these cases the plate has a free end that goes into the slot .


#7

F

Felicity

bertsmobile1 said:
That is not the correct PTO clutch for your mower and some one has done a "Hillbilly" modification to one they had to sort of make it work or fitted a PTO to a mower that did not have one.
It would have been really nice if you had posted your model & serial numbers but such is life.
According to the ARI, MTD made 5 variations of the Yardman Lawn tractor in 1998 and none of them had an electric PTO.
The Garden tractors did have an electric PTO and there were two variations

THis is where those numbers would really have helped those who are trying to help you but I don't want to sound like I am nagging, even though I am actually nagging.

View attachment 25995
This appears to be what you have and the clutch ( No 110 ) is secured by the plate ( No 112 )

Or it could be this set up
View attachment 25996

Or in this example where the clutch ( No 97 ) is secured by a different plate (No 96 )

In both these cases the plate has a free end that goes into the slot .
Click to expand...

Wow, this sounds ominous !! The model no. of my machine is 13AF794N643 - if this changes your diagnosis please tell. Thank you so much for the diagrams - it would be a great help if the part- no & descriptions were listed.


#8

M

mechanic mark

Buy Parts - Powertool Spares

Buy Spare Parts for Yard-Man HN 7180 - 13AF794N643 (1998) Electric clutch, Engine pulley - Powertool Spares

Cub Cadet 717 1459 917 1459 MTD 5217 35 PTO Clutch | eBay


#9

I

ILENGINE

From the diagram that mark posted it looks like the pin in the right side of your picture should fit down though a hole in the clutch on what would be the left side of the picture. So your clutch needs to rotate like 90 degrees clockwise if viewed from the under side and then the pin fits though the hole


#10

F

Felicity

mechanic mark said:
Buy Parts - Powertool Spares

Buy Spare Parts for Yard-Man HN 7180 - 13AF794N643 (1998) Electric clutch, Engine pulley - Powertool Spares

Cub Cadet 717 1459 917 1459 MTD 5217 35 PTO Clutch | eBay
Click to expand...

Ahah !! Many thanks Mark for the excellent diagrams - it now appears that the top of the PTO clutch is fixed in place by a pin, which explains why the wiring is being pulled in my case. I shall now determine if the shaft which I refered to previously is the pin in question or is a safeguard for the belt as has been suggested. Many thanks again for your help.


#11

F

Felicity

ILENGINE said:
From the diagram that mark posted it looks like the pin in the right side of your picture should fit down though a hole in the clutch on what would be the left side of the picture. So your clutch needs to rotate like 90 degrees clockwise if viewed from the under side and then the pin fits though the hole
Click to expand...

Yes looks that way to me too - a picture speaks a thousand words !! Many thanks.


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