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D9 convert from torque converter to direct drive

D9 convert from torque converter to direct drive

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clayton
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Well made the mistake of going and looking at a D9 19A and I can’t justify getting it other than I want it! I’m looking to replace the torque converter to direct drive wondering if anyone has a parts machine D9 18A, I need from the flywheel back to transmission or last resort a good used torque converter for a 19A but would much rather make it direct drive, wondering if anyone on here has done this and what problems they had found thank you for any assistance.
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Thu, Sep 26, 2024 11:46 PM
PhilC
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I don't know about the D9's but I think the D8 torque convertor drive has a longer chassis compared to the direct drive.
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Fri, Sep 27, 2024 4:48 PM
brian18a
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Reply to PhilC:
I don't know about the D9's but I think the D8 torque convertor drive has a longer chassis compared to the direct drive.
The case and engine frame assembly according to parts book and NPR are different for 18A and 19A. No clue what specific differences are. If 19A is longer would not be impossible to convert, would need longer drive shaft from clutch to transmission. Unless there is something that would make oil clutch interfere with something in frame design.
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Fri, Sep 27, 2024 10:01 PM
neil
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Reply to brian18a:
The case and engine frame assembly according to parts book and NPR are different for 18A and 19A. No clue what specific differences are. If 19A is longer would not be impossible to convert, would need longer drive shaft from clutch to transmission. Unless there is something that would make oil clutch interfere with something in frame design.
Hi Clayton, if it worked out, would this tractor have a clutch and a 3-speed powershift? Reason I ask is that the D8LSA is almost that. It has an hydraulically-operated two-speed clutch (direct and underdrive) coupled to the 3-speed powershift, giving it 6 speeds forward and reverse. The other thing is that if you did manage to build it, that would give an option to other 19As that need unavailable torque convertor parts (I don't know if parts are available, but if they aren't, this would be a potential lifeline for those tractors)
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Fri, Sep 27, 2024 10:49 PM
brian18a
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Reply to neil:
Hi Clayton, if it worked out, would this tractor have a clutch and a 3-speed powershift? Reason I ask is that the D8LSA is almost that. It has an hydraulically-operated two-speed clutch (direct and underdrive) coupled to the 3-speed powershift, giving it 6 speeds forward and reverse. The other thing is that if you did manage to build it, that would give an option to other 19As that need unavailable torque convertor parts (I don't know if parts are available, but if they aren't, this would be a potential lifeline for those tractors)
No it would have a manual oil clutch and a gear drive manual transmission. Very much like 14A and 36A D8s.
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Sat, Sep 28, 2024 1:50 AM
clayton
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Hi Neil yes Brian18a is correct it would not have any sort of power shift to it. The under carriage is in great shape actually the entire machine is in great shape except for the torque converter being bad .
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Sat, Sep 28, 2024 3:26 AM
Wombat
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Reply to clayton:
Hi Neil yes Brian18a is correct it would not have any sort of power shift to it. The under carriage is in great shape actually the entire machine is in great shape except for the torque converter being bad .
Not sure what you want to do with the tractor, if you replaced the converter/clutch assembly with an oil clutch, you then have a 3 speed direct drive with a first gear slightly faster than 4th gear in a direct drive 18A.

Wombat
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Sat, Sep 28, 2024 1:17 PM
clayton
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Reply to clayton:
Hi Neil yes Brian18a is correct it would not have any sort of power shift to it. The under carriage is in great shape actually the entire machine is in great shape except for the torque converter being bad .
Wobat it’s too good of a tractor to go to the scrap yard but I have been unsuccessful at finding a used torque converter and was trying to find other options to make it operational again. So if I were to make it direct drive is the gear ratio in the transmission difference in a 18A versus a 19A or is the torque converter somehow slowing the output shaft down?
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Sun, Sep 29, 2024 4:06 AM
brian18a
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Reply to clayton:
Wobat it’s too good of a tractor to go to the scrap yard but I have been unsuccessful at finding a used torque converter and was trying to find other options to make it operational again. So if I were to make it direct drive is the gear ratio in the transmission difference in a 18A versus a 19A or is the torque converter somehow slowing the output shaft down?
completely different transmissions. Torque converter is 3 speed, speeds controlled by engine rpm load and torque converter output rpm. as load increases speed decreases for a given engine rpm. Provides a fairly large range of tractor speed for each transmission gear.
18A direct drive is a six speed transmission. A manual transmission has a narrow band of tractor speed for each gear.
To make an usable tractor, one would need to replace 19a transmission.
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Sun, Sep 29, 2024 5:18 AM
brian18a
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 [attachment=77719]IMG_3079.jpg[/attachment]Specs for D9D. Shows difference in performance between direct drive and Torque converter
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Sun, Sep 29, 2024 5:37 AM
brian18a
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a couple of pictures of my late 19A, Equipped with Peterson Caterpillar Hayward CA cushion dozer , ATECO ripper with push block, Oakland CA, and a Torrance canopy Torrance CA, [attachment=77720]IMG_2733.jpg[/attachment][attachment=77721]IMG_2732.jpg[/attachment][attachment=77722]IMG_2731.jpg[/attachment]
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Sun, Sep 29, 2024 5:53 AM
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