Bob Cat 20" re-do - Snowblower Forum : Snow Blower Forums
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post #1 of 19 Old 12-21-2014, 04:10 PM Thread Starter
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Bob Cat 20" re-do

I've had this Bob Cat 520 since the mid 1970's, best machine I've ever owned. So about two yr's ago I decided to give it a go-over. One of the things that I never really cared for was the 5hp Briggs flathead with the floatless pumper carb so I found an OHV Briggs on ebay that had the 6:1 reduction box and proceeded to make it fit. Not to difficult, same mount holes just a bit of cutting on the driveside bulkhead to fit the larger gear case, and then fabricate some shrouding to make the engine winter worthy.
While I was into it I fab'ed a new scraper, and changed the impeller shaft and bearings (which as it turned out didn't need to be replaced)
Anyway, this machine with the new OHV engine now runs even stronger than ever, and the low speed operation is far smoother than it was with the pumper carb motor.
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post #2 of 19 Old 12-21-2014, 04:16 PM
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Nice job, and just out of curiosity, did the original engine have a reduction gear?

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MTD....2 stage(modern 8.5 HP) not my favorite
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post #3 of 19 Old 12-21-2014, 04:16 PM
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NICE JOB. Very nice!

2014 Ariens Deluxe 30 #921032 w/Armor skids, LED's, Hand warmers.
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post #4 of 19 Old 12-21-2014, 04:18 PM
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Quote:
Originally Posted by BobCat520 View Post
I've had this Bob Cat 520 since the mid 1970's, best machine I've ever owned. So about two yr's ago I decided to give it a go-over. One of the things that I never really cared for was the 5hp Briggs flathead with the floatless pumper carb so I found an OHV Briggs on ebay that had the 6:1 reduction box and proceeded to make it fit. Not to difficult, same mount holes just a bit of cutting on the driveside bulkhead to fit the larger gear case, and then fabricate some shrouding to make the engine winter worthy.
While I was into it I fab'ed a new scraper, and changed the impeller shaft and bearings (which as it turned out didn't need to be replaced)
Anyway, this machine with the new OHV engine now runs even stronger than ever, and the low speed operation is far smoother than it was with the pumper carb motor.
Nice. I never much liked my old Tecumseh either and your modern OHV Briggs will even use less fuel all while making about 2 extra horsepower too. Post a video of it throwing snow. I heard the BOb-Cat machines can really toss the snow.
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post #5 of 19 Old 12-21-2014, 05:03 PM
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nice, I have the same one, I have only been able to use it one time since I just got it, my engine runs great though and it threw the slushy wet snow pretty good.

heres mine
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post #6 of 19 Old 12-21-2014, 05:19 PM
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now you have a true modern classic, nice repower

current machines
1-toro2450E-38419. 1-toro3000E-38435. 1-toro 3650E-38445
2-toro 521E-38052. 1-toro xl824pt 38086
1-.............,TORO XL 624ps..............
1-............, TORO XL 824ps..............
william
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post #7 of 19 Old 12-21-2014, 05:43 PM
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Good job, a Bobcat is on my wish list.

1962 or '63 Snow Bird S-225
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post #8 of 19 Old 12-21-2014, 06:29 PM
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The augers on these things always look so flimsy to me by the standards of other machines of that vintage. Has anyone ever had any issues with them getting bent?

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post #9 of 19 Old 12-21-2014, 06:32 PM
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Cool machine. Quite the augers.

HS 928 TCD. It's Canadian eh! (Sure I'm done modifying it, for now, until next time.......)
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post #10 of 19 Old 12-21-2014, 06:59 PM
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I like it a lot.
I'll bet those augers are twice as thick as any others, and they are welded to fat solid steel bars. Having only one support makes it look flimsy, but I'd still bet you could take a sledge hammer to them and they would be stronger than the typical auger construction.
Then again, I could be wrong.
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