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Gravely bug bit.
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8,737 Posts
Discussion Starter · #1 ·
Info and pictures of a 24-G's 60" deck.
1. 6-bolt spindle 1 belt deck.
2. Differences in lenght of weldments for a G vs the 24-G's on the deck
3. Width differences of the weldments
4. Belt decal
5. 60" two belt ProMaster 20-G deck
 

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Thanks for the pictures Don.

Do you have any idea why Gravely would make 60 inch decks with 1 vs 2 belts coming off the same style gearbox? Does one have any advantage over the other?

The two belt system looks the same as the 60 inch decks for the regular G tractors.

Do the ProMaster 2 belt 60 inch decks spin faster than the 2 belt 60 inch decks for the G tractors?

Tom
 

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Gravely bug bit.
Joined
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8,737 Posts
Discussion Starter · #3 ·
Thanks for the pictures Don.

Do you have any idea why Gravely would make 60 inch decks with 1 vs 2 belts coming off the same style gearbox? Does one have any advantage over the other?

The two belt system looks the same as the 60 inch decks for the regular G tractors.

Do the ProMaster 2 belt 60 inch decks spin faster than the 2 belt 60 inch decks for the G tractors?

Tom
Should result in the same blade speed for both. The two belt system is likely not to slip the pulley on the spindle away from the discharge. But with that you get more power robbed from belt friction.

The two belt deck is the same but the difference is in the gearbox gearing. Regular -G PTO is at 1200 RPM while the PM 20-G runs at 1800 RPM. So the regular uses a 1:1.5 gearing while the PM uses a 27:26 or 1:1 gearing. Advantage PM 20-G as the tranny doesn't have to drop the speed only to have the gearbox speed it back up.
 
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