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post #1 of 9 Old 09-10-2019, 04:15 PM Thread Starter
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D Series Gear Drive Question

Does anyone know which side the thrust washer goes in on the gear drive D engines? before the gear or after? I have a D-400 gear drive short block I'm going to use on my recently failed 7260B (rod cap was cracked luckily it didn't blow up) and I forget what order the gear and thrust washer go in and I don't want to nuke this one either. Thanks!

Mowers:
1970 - 5239 (D-408)
1973 - 3058 (D-433) (Rebuilt)
1974 - 8251 (D-480)
1975 - 5273 (D-601) (Rebuilt)
1982 - 7071 (F-101) (Custom)
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post #2 of 9 Old 09-10-2019, 05:09 PM
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Re: D Series Gear Drive Question

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Originally Posted by LawnBoy90 View Post
Does anyone know which side the thrust washer goes in on the gear drive D engines? before the gear or after? I have a D-400 gear drive short block I'm going to use on my recently failed 7260B (rod cap was cracked luckily it didn't blow up) and I forget what order the gear and thrust washer go in and I don't want to nuke this one either. Thanks!
I'm not sure that you can use a D-480 short block on a pusher 7260B without some mods. It might be better just to use the individual parts from the D-480 and install in the D engine of your 7260B. What did you plan on doing with the drive shaft hole in the crankcase? It would seem to me that you would have to just plug the hole somehow, since the driveshaft will have nothing to connect to on a pusher D-400. The jug, piston and rod should all be the same part number for both engines so what about just replacing those parts and leaving the crank and crankcase original?

Edit: The D-480 shaft drive engine also mounts rotated 45 degrees from the standard D series so not sure what problems that would present.

Last edited by Lawnboy77; 09-10-2019 at 05:19 PM.
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post #3 of 9 Old 09-10-2019, 05:42 PM Thread Starter
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Re: D Series Gear Drive Question

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Originally Posted by Lawnboy77 View Post
I'm not sure that you can use a D-480 short block on a pusher 7260B without some mods. It might be better just to use the individual parts from the D-480 and install in the D engine of your 7260B. What did you plan on doing with the drive shaft hole in the crankcase? It would seem to me that you would have to just plug the hole somehow, since the driveshaft will have nothing to connect to on a pusher D-400. The jug, piston and rod should all be the same part number for both engines so what about just replacing those parts and leaving the crank and crankcase original?

Edit: The D-480 shaft drive engine also mounts rotated 45 degrees from the standard D series so not sure what problems that would present.
I have a muffler plate for a D-600 and parts for the capstan setup to make this a functional D-480 powered 825- series mower. I originally used parts from a previous 8251 I parted out. However I figured I would resurrect the 8251 and use the crankcase on another dead mower of mine. It had the extended snout crankcase on it but I don't have a clean enough crank for the bottom seal to seal properly and with the parts I have it'll only cost me new bottom end gasket and PTO seal which isn't too much.

Mowers:
1970 - 5239 (D-408)
1973 - 3058 (D-433) (Rebuilt)
1974 - 8251 (D-480)
1975 - 5273 (D-601) (Rebuilt)
1982 - 7071 (F-101) (Custom)
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post #4 of 9 Old 09-10-2019, 05:50 PM
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Re: D Series Gear Drive Question

Okay I understand now...you are converting the 7260B pusher into a shaft drive SP. Sounds like a good plan! As for the order of assembly, I would just go with what the parts catalogue says. I'm not sure if there is a manual that covers the shaft drive setup, but I'll be there is a service manual that would cover those. I don't think I have any reference that covers that, I'll look for anything and post pictures on this thread about the shaft drive setup. Old Lawnboy (Bill) probably has something on it.
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post #5 of 9 Old 09-10-2019, 06:19 PM
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Re: D Series Gear Drive Question

Click image for larger version

Name:	d480.jpeg
Views:	19
Size:	69.0 KB
ID:	2395709See attached page, bottom left side.
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post #6 of 9 Old 09-10-2019, 06:36 PM Thread Starter
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Re: D Series Gear Drive Question

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Originally Posted by Lawnboy77 View Post
Okay I understand now...you are converting the 7260B pusher into a shaft drive SP. Sounds like a good plan! As for the order of assembly, I would just go with what the parts catalogue says. I'm not sure if there is a manual that covers the shaft drive setup, but I'll be there is a service manual that would cover those. I don't think I have any reference that covers that, I'll look for anything and post pictures on this thread about the shaft drive setup. Old Lawnboy (Bill) probably has something on it.
My bad I should've explained that first! When I first got the engine I thought the washer was after the gear but it does look like the washer goes first then the gear. It seemed to function okay in both spots so that's why I was confused. I'll get some pictures soon taking a break for now.

Mowers:
1970 - 5239 (D-408)
1973 - 3058 (D-433) (Rebuilt)
1974 - 8251 (D-480)
1975 - 5273 (D-601) (Rebuilt)
1982 - 7071 (F-101) (Custom)
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post #7 of 9 Old 09-10-2019, 06:47 PM Thread Starter
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Re: D Series Gear Drive Question

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Attachment 2395709See attached page, bottom left side.
Thanks for coming through old lawnboy! By stationary pin are they talking about the PTO shaft or something different? I didn't see anything sticking out in there but will check again. The washer for my mower appears to be p/n 608363 not the 608030 that is listed on that page. That parts viewer shows the washer coming before the gear and when I got the machine I think it was behind. So maybe the PO did some repair work on it who knows.

Mowers:
1970 - 5239 (D-408)
1973 - 3058 (D-433) (Rebuilt)
1974 - 8251 (D-480)
1975 - 5273 (D-601) (Rebuilt)
1982 - 7071 (F-101) (Custom)
LawnBoy90 is online now  
post #8 of 9 Old 09-11-2019, 10:08 AM
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Re: D Series Gear Drive Question

Click image for larger version

Name:	Scan_20190911.jpg
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Size:	70.3 KB
ID:	2395777 The picture with thrust washer and gear is correct. Gear should line up with the center of crankshaft. Part number 608363 is thrust washer for crankshaft that went into the crankcase prior to inserting the crankshaft. I can not find any information showing the 608363 thrust washer but I have 15 of the in stock and they are for crankshaft as the attached picture will show their size. The thrust washer is cast into later crankcases and the earlier version using the 608363 was not available after the cast in version was made.
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post #9 of 9 Old 09-12-2019, 07:01 PM Thread Starter
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Re: D Series Gear Drive Question

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Originally Posted by old lawnboy View Post
Attachment 2395777 The picture with thrust washer and gear is correct. Gear should line up with the center of crankshaft. Part number 608363 is thrust washer for crankshaft that went into the crankcase prior to inserting the crankshaft. I can not find any information showing the 608363 thrust washer but I have 15 of the in stock and they are for crankshaft as the attached picture will show their size. The thrust washer is cast into later crankcases and the earlier version using the 608363 was not available after the cast in version was made.
Oh okay! I thought that's what they were talking about. The driveshaft washer that came with this mower doesn't seem like the one I had in my parts because it's pretty thin. The one in the picture looks a little thicker. I found one that matches pretty well and have it installed. Couldn't get to pictures today but I followed the order shown in the parts drawing so I should be good now. We'll see soon. I'm waiting on the gaskets and seal and the heat to die down to get this project finished up. Thanks old lawnboy and LawnBoy77!

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Mowers:
1970 - 5239 (D-408)
1973 - 3058 (D-433) (Rebuilt)
1974 - 8251 (D-480)
1975 - 5273 (D-601) (Rebuilt)
1982 - 7071 (F-101) (Custom)
LawnBoy90 is online now  
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