Yanmar ym1602 / ym1502 lift arm guides.

[grumbolt]

i recently acquired a YM1602 (my first yanmar) and in getting things squared away, i have replaced the clutch, and with the help of members here looks like i am getting my hydraulic stuff sorted out between the lift arms and loader etc.. but while working near the back, and using the lift arms to move a trailer, i noticed that there was nothing to keep the arms from going side to side possibly rubbing the tires, so i got to looking and didnt even see anywhere outboard of the arms to attach limiting chains. so i grabbed the measuring tools and went to scheming lol..

what i came up with is a bracket that uses the existing bolt locations at the end of the axle housing and puts the pivot point for the chains at the same axis as the arms themselves so it stays somewhat the same tension through the range of motion of the arms..

currently i only have chains hooked up on it, but soon i plan to find some turnbuckles so that it is adjustable. if any are interested in the pdf of the bracket i drew it at 1 to 1 scale so that you can just print it and glue it to a piece of steel to use as a template.

i tried to post it here, but dont see a way to attach a pdf.

if any of you have suggestions or comments feel free to comment..

Happy Thanksgiving!
Grum

 

[grumbolt]

well reading around on the forum, i learned that the 3 point hitch wasnt offered originally on the 1602, and that if it has one, it was a retrofit / addon and is only as good, strong, or stable as the installers ability allowed at the time..

in the interest of preventing anything from breaking (reinforcing before breakage is always easier and less expensive than repairing breakage)

so i started inspecting my 3 point, and noticed that the nice thick heavy duty 1" bolts that anchor the tractor end of the arms are attached to a 1/8" plate that is bolted to the inner housing using 3 of the inner housing bolts.

it is also in single shear (as most tractors are, but the 1 inch pins on those tractors that have been designed to support them with nice heavy thick weldments/frame)

so it looks like i will be redesigning the frame mounting of the 3 point, and possibly making it double shear, but at the very least make the mount strong enough that single shear will be strong enough. this means that the mounts i just made and installed are gonna need to be redesigned and fabricated if i move the pins up, down, fore, or aft.

i made the above brackets out of 3/8 plate, so will probably do the same with the arm anchors.

currently the arm anchors are bolted with the rear lower 3 inner case bolts (m10x1.5) like i did the above brackets.

the location of the anchor is currently above the hitch, and forward of the rear case.

i am not sure what a part is that is bolted to the rear case with a 1/2" spacer, but that actually affords opportunity to redesign the spacer and incorporate the anchor base into it. basically makeing the current anchor plates out of 3/8 or 1/2 inch plate, and extending the plate of the spacer and the anchor to meet making a large "U" that would bolt on the back of the case as well as the sides of the case where the axle housings bolt to the case, this would leave the current location intact.

if any of you know what the part bolted to the back of the differential case at the pto output shaft is, or more specifically what it is used for (i know it is a pivot point, but im not sure what it is used for..) i would love to hear your ideas..


if i stay with the bolt and nut, it wont push the arms out any, and am leaning towards that..

please find attached pictures of the rear area being discussed..

 

[R Barger]

well reading around on the forum, i learned that the 3 point hitch wasnt offered originally on the 1602, and that if it has one, it was a retrofit / addon and is only as good, strong, or stable as the installers ability allowed at the time..

in the interest of preventing anything from breaking (reinforcing before breakage is always easier and less expensive than repairing breakage)

so i started inspecting my 3 point, and noticed that the nice thick heavy duty 1" bolts that anchor the tractor end of the arms are attached to a 1/8" plate that is bolted to the inner housing using 3 of the inner housing bolts.

it is also in single shear (as most tractors are, but the 1 inch pins on those tractors that have been designed to support them with nice heavy thick weldments/frame)

so it looks like i will be redesigning the frame mounting of the 3 point, and possibly making it double shear, but at the very least make the mount strong enough that single shear will be strong enough. this means that the mounts i just made and installed are gonna need to be redesigned and fabricated if i move the pins up, down, fore, or aft.

i made the above brackets out of 3/8 plate, so will probably do the same with the arm anchors.

currently the arm anchors are bolted with the rear lower 3 inner case bolts (m10x1.5) like i did the above brackets.

the location of the anchor is currently above the hitch, and forward of the rear case.

i am not sure what a part is that is bolted to the rear case with a 1/2" spacer, but that actually affords opportunity to redesign the spacer and incorporate the anchor base into it. basically makeing the current anchor plates out of 3/8 or 1/2 inch plate, and extending the plate of the spacer and the anchor to meet making a large "U" that would bolt on the back of the case as well as the sides of the case where the axle housings bolt to the case, this would leave the current location intact.

if any of you know what the part bolted to the back of the differential case at the pto output shaft is, or more specifically what it is used for (i know it is a pivot point, but im not sure what it is used for..) i would love to hear your ideas..


if i stay with the bolt and nut, it wont push the arms out any, and am leaning towards that..

please find attached pictures of the rear area being discussed..

Your chain mount on your tractor will have to be direct in line with your lift arm mounts or it will bind when you work your 3 pt lift.

 

[grumbolt]

Your chain mount on your tractor will have to be direct in line with your lift arm mounts or it will bind when you work your 3 pt lift.

thats what i was thinking also, i will most likely keep the location the same.

that being said, i know i am gonna make the mounts stronger, i just havent decided if i am gonna make them double shear. i am leaning towards making them out of 1/2 inch plate, bolted on the sides as well as the back of the transmission, basically one large single piece bolted on 3 sides instead of the 2 individual pieces.



i am probably overthinking it and i definitely tend to overbuild things.

do you guys see any benefit to using the bolts instead of the pins like what is typically used on tractors?

 

[bmaverick]

thats what i was thinking also, i will most likely keep the location the same.

that being said, i know i am gonna make the mounts stronger, i just havent decided if i am gonna make them double shear. i am leaning towards making them out of 1/2 inch plate, bolted on the sides as well as the back of the transmission, basically one large single piece bolted on 3 sides instead of the 2 individual pieces.



i am probably overthinking it and i definitely tend to overbuild things.

do you guys see any benefit to using the bolts instead of the pins like what is typically used on tractors?

Your model isn't too far off the frame size of a YM1510.

See attached and start at booklet page 83.

SpareX part numbers are sold thru many Farm retailers. So these part numbers can be found all over.

 

[grumbolt]

Your model isn't too far off the frame size of a YM1510.

View attachment 4454005

View attachment 4454006

See attached and start at booklet page 83.

SpareX part numbers are sold thru many Farm retailers. So these part numbers can be found all over.

you are awesome, thanks for the info! btw you wouldnt happen to know if there is a service manual available for the 1602 would you? i have the parts manual for the 1610 that i am currently translating to english, i hope that is the right one for my tractor lol..

also, do you know what the adapter bolted on to the back of the transmission is for?

Attachments

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  pto attachment.jpg

  6.8 MB · Views: 15

 

[careyo63]

Reply #2 the L. arm anchor JPG.. My org. metric threads have finally worn out also. Looks as though that may have happened on yours also from what I can see. Sure looks that way from the steel plate.
Last time it came loose I was able remove the washer and catch the last remaining Metric threads. Been having trouble for decades keeping them tight. Esp the L. one..
This last time I had to use a Standard threaded pin.. Larger Dia. that I put a Tach weld on the Loc. nut to make sure it didn't come loose. I haven't had it come loose yet but it takes quite a few Hrs. for it to loosen up. Worst case I'll try to Heli coil insert it.

 

[bmaverick]

you are awesome, thanks for the info! btw you wouldnt happen to know if there is a service manual available for the 1602 would you? i have the parts manual for the 1610 that i am currently translating to english, i hope that is the right one for my tractor lol..

also, do you know what the adapter bolted on to the back of the transmission is for?

Attachments

• 
  pto attachment.jpg

  6.8 MB · Views: 15

The YM1610 parts manual is for the Ground & Recreational parks care. The reason why it ends in GR.
Engine wise it will be close. The YM1720DGR is the same way.

For the Gray Market machines, Japan has a different culture, people bring their machines in to be repaired for overhaul. Thus, no service manuals.

For a Service Manual, you would need to find the Yanmar domestic sold machine manuals.
The YTOG has several, and the YM-1.

 

[bmaverick]

also, do you know what the adapter bolted on to the back of the transmission is for?

Attachments

• 
  pto attachment.jpg

  6.8 MB · Views: 15

The adapter bolted to the back is for a Yanmar rotary tiller. In this case, it would be a 2-point model, not a 3-point.

Chances are, it was a RC class tiller from that era.

 

[grumbolt]

The adapter bolted to the back is for a Yanmar rotary tiller. In this case, it would be a 2-point model, not a 3-point.

Chances are, it was a RC class tiller from that era.

so probably not gonna be needed in the future for my uses.. if i get a rotary tiller, it would be a 3 point model..

in your opinion would it be something worth trying to sell / trade?