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Ari Holopainen / junkyard2 | |
| JUNKYARD PART II: Main Page Continues: S.1. Old 8+4R-speed tractor transmission, overall gear ratio 11,90: Main gearbox + 2+R-speed auxiliary Inspirer: Ford 6610 Dual-range
I met this kind of transmission in my teenage years when I drove shortly one Ford tractor (I don’t remember model number any more). This tractor was rear wheel drive and its top speed was 30 km/h. It has 4-speed main gearbox without a reverse gear. Auxiliary gearbox has 2 forward gears and a reverse gear. So altogether you’ve got 4 slow gears and 4 fast gears in forward plus 4 slow gears in reverse. This kind of transmission is ideal when you have to drive slow and change often driving direction. The idea is to choose suitable gear in main gearbox and then use only auxiliary. On the other hand this kind of transmission isn’t good at high speed driving although you can move off as high gear as 7th if you are unloaded and slide the clutch a little. When you drive with 8th gear and need to reverse you simply choose gear R4 with auxiliary shift lever. But to drive forward fast again you have to shift with the both sticks to get 5th, 6th or 7th gear, which are suitable gears to move off. If you need shorter lego transmission you can also locate main gearbox and auxiliary parallel. Check pictures and video of alternative setup. This modification makes auxiliary’s high range a little bit more complicated but it doesn’t change ratios or gear steps. If you build this you have to be careful with two shift levers while they are also parallel. There is a gap between main gearbox and auxiliary so you can put longitudinal brick with holes there. Then put shift lever axles only half studs inside this middle brick so shift lever axles are independent and supported at the both ends. S.2. Old 16+8R-speed tractor transmission, overall gear ratio 13,61: Splitter + main gearbox + fwd/rev+range Inspirer: Ford 6610 Dual Power
This 16+8R-speed tractor transmission is big brother of the previous 8+4R-speed transmission. Like earlier it has 4-speed main gearbox and 3-speed auxiliary, which has Lo and Hi range in forward plus (low) reverse (named as fwd/rev+range). But now real transmission has also Hi-Lo powershift. In lego version powershift is replaced with splitter because powershift is not possible with legos. Splitter has shift lever auto locking to make it easier to use. Adjust tightness of rubber belt with bricks so that locking pin doesn’t move while driving but jumps up easily when shift lever is moved. There is available also alternative setup in which main gearbox and fwd/rev+range-auxiliary are located parallel to get shorter transmission. Splitter is also modified so that it has different gear wheels but ratios and gear steps are same as in original setup. Building tip: for shift lever axles put longitudinal brick with holes also between main gearbox and fwd/rev+range and then both shift lever axles only half studs inside it. One notable thing in this lego and Ford’s transmissions is that low and high range overlap each other a little so that 4H is faster than 5L. But this doesn’t affect to your driving because shift 4H-5L would need shifting in all 3 gearboxes at the same time and normally you don’t even change range while moving. Lego remote shift splitter (crash box) While lego version’s splitter is sliding axle type you can attach gear rack to its shifting system and use small motor to slide the shifting axle. In this example is used micro motor on electric plate. So this way you get remotely shifted crash box splitter which is a little bit closer to real powershift than manual splitter. While it’s not powershift and uses sliding axle technic I can’t guarantee that it can complete the shift in every driving situations. Note that pictures show only principle how you can do remote shift, motor will need more support if you really build this.
This structure can be adopted also to 24+8R-speed tractor transmission that has 2-speed splitter representing powershift. But this shifting system doesn’t work very good in 3-speed splitter of 45+45R-speed tractor transmission because it’s difficult to stop sliding axle into middle gear while there are no steps in shifting system. So in that case it will be better to replace splitter with 3-speed powershift that uses two motors and a planetary gear. S.3. Old 12+8R-speed tractor transmission, overall gear ratio 40,82: 4-speed main gearbox + 2+R-speed auxiliary + on/off creeper unit Inspirer: Valmet 900 (TractorData)
This 12+8R-speed tractor transmission is based on 8+4R-speed transmission, which has 4-speed main gearbox and 2+R-speed auxiliary (fwd/rev+range) which means low and high range in forward plus (low) reverse. Now there is also a creeper unit which gives 4 more gears in both driving directions. When extra low speeds are needed creeper range can be switched on together with low and reverse range in normal auxiliary. There is available also alternative setup in which main gearbox and 2+R-speed auxiliary are located parallel to get shorter transmission. Also creeper unit is moved from rear to front. Building tip: to support both shift lever axles put longitudinal brick with holes also between main gearbox and 2+R-speed auxiliary and then both shift lever axles only half studs inside it. There is also a cousin 12+8R-speed transmission in E. Flat Gearbox Designs, page Basic & special designs. Some Valmets have 8+4R-speed basic transmission like some Ford Tractors. Valmet has two alternative optional equipment: either creeper unit or mechanical splitter, but not both. With creeper unit transmission is 12+8R-speed and enables extra low speed driving. Splitter unit doubles the number of gears and halves the gear steps so transmission is 16+8R-speed and it’s for more accurate working speed control. I haven’t modeled splitter version but you can copy splitter (gear step 1,20) from later shown 24+8R-speed tractor transmission and use it instead of creeper unit to get 16+8R-speed version. S.6. Old 12+12R-speed tractor transmission, overall gear ratio 15,63: 6-speed main gearbox + 2+2R-speed auxiliary Inspirer: Massey Ferguson 4608
This tractor transmission has 6-speed main gearbox (without a reverse gear) and auxiliary with four positions: slow and fast in both driving directions. Altogether you’ve got 12 forward gears and 12 reverse gears, which means that you can drive rearward as fast as forward if you have the guts. Actually this is unnecessary in lego transmissions because lego motor works in both directions and you don’t need reverse gears.
Massey Ferguson’s transmission has one difference compared to this lego transmission. Massey Ferguson’s transmission has three sticks: one is for main gearbox, other for range unit and third for driving direction changer. Lego transmission has only two sticks because range unit and driving direction changer are combined in one auxiliary. Massey Ferguson’s driving direction changer is a power shuttle, which means that while moving you can change driving direction simply moving changer’s shift lever, no clutch pedal is needed during operation. But I don’t know how high gear or speed you can change direction. In lego transmission you change driving direction with auxiliary shift or by changing motor’s rotation direction. Also Valtra has 12+12R-speed transmission that has 6 main gears with 2 ranges. S.8. Old 16+16R-speed tractor transmission, overall gear ratio 18,67: 4-speed main gearbox + fwd/rev + 4-speed range Inspirer: John Deere 6430 PowrReverser (TractorData)
This tractor transmission has 4-speed main gearbox, driving direction changer and 4-speed range unit (ranges A, B, C and D). Altogether you have 16 gears in both driving directions.
Ranges overlap each other so that top gear of lower range is faster than 1st gear in higher range. Idea is that you choose suitable range before you move off and then use only main gearbox and driving direction changer. If you need to move off in lower range than you are about to drive, it’s possible to change range without shifting also main gearbox while range’s gear steps are relatively small. This way you can avoid difficult two stick shift. For example in heavy loaded transport situation John Deere recommends upshifting sequence (A1)-(B1)-C1-D1-D2-D3-D4. Note that in John Deere’s range unit gear step B-C is smaller than others. Reason for this is to get more suitable gears for field working speeds for farm tractors. I haven’t copied this feature to this lego transmission in which all range steps are 2,00. But there are available two versions in which range step B-C is smaller than others: next 16+16R-speed version II and sequential version 16+16R-speed tractor in R. Sequential Transmissions. So check them to see how good variety of ratios with small steps is available and how difficult it can be to choose right gear when you drive like a pro. Although this transmission and 12+12R-speed transmission version II are inspired by different tractors, main gearbox’s ratios of 12-speed transmission fitted perfectly to this 16-speed transmission. So this transmission’s main gearbox and driving direction changer are taken directly from 12-speed transmission, the only new part is 4-speed range unit. It reduced a lot LDraw file design time. On the other hand main gearbox is again overdrive version which is not practical in tractor use. Note that range unit’s input axle has independent coaxial “friend axle” next to it: dark grey 8 teeth gears are on the input axle and light grey 8 teeth gear is on the friend axle. So don’t attach these axles together if you build this transmission. This arrangement is to get only 2 stages in ranges B-D have while range A has 4 stages with extra side axle. Otherwise you have to make 3-stage construction to get slowest ratio which means little poorer efficiency in higher ranges. S.9. Old 16+16R-speed tractor transmission version II, overall gear ratio 13,78: Fwd/rev + 4-speed range + 4-speed main gearbox Inspirer: John Deere 6430 PowrReverser (TractorData)
Also this 16+16R-speed tractor transmission has 4-speed main gearbox, 4-speed range unit (ranges A-D) and driving direction changer. Unlike previous version I this transmission has synchro range unit, sliding axle driving direction changer and direct drive main gearbox. Main gearbox and range unit are located parallel which makes structure short but wide. So this one is more like next 12+4R-speed alternative setup and its upgraded version 21+7R-speed. For shift lever axles put longitudinal brick with holes also between main gearbox and range unit and axles only half studs inside middle brick.
Like in previous 16+16R-speed ranges overlap each other, and now range step B-C is smaller than others. Idea is copied from John Deere’s transmission and is to get more gears for field working speeds (4-12 km/h). When you sort gear ratios you can see that there are good small gear steps in middle gears so you can get right speed for every working situation. But choosing right gear is not so easy while most of the sequential gears are in different ranges, check table Ratios sorted in picture Ratios. These small steps are for working speed control and you are not supposed to use all these gears in upshifting procedure, two stick shifts are just too complex. John Deere’s recommended upshifting sequence from stop to full speed is (A1)-(B1)-C1-D1-D2-D3-D4. Because range steps are larger than steps of main gearbox you upshift between ranges first. But you can always keep things simple so that you choose first suitable speed range with range unit and then use only main gearbox and driving direction changer. Changing between forward and reverse is this lego version’s weak point while driving direction changer is sliding axle version. Especially this original setup is problematic due to used XS(8) and S(16) spur gears. When main gearbox and range unit are synchro versions 3rd synchro gearbox would be too much because of the backlash problems. So I guess that those who will build this transmission will use motor to change driving direction. S.11. Old 24+8R-speed tractor transmission, overall gear ratio 12,60: Splitter + 4-speed range + 3-speed main gearbox Inspirer: John Deere 9430 PowrSync
This 24+8R-speed transmission is enlarged version of previous 12+4R-speed transmission. 3-speed main gearbox with a reverse gear and 4-speed range unit (ranges A-D) are taken directly from 12+4R-speed alternative setup. New feature is 2-speed splitter so you got 24 forward and 8 reverse gears altogether. In John Deere’s transmission is of course Hi-Lo powershift but other difference is that D range is not available in reverse so it has only 6 reverse gears. If you need more information about powershift check earlier 16+8R-speed tractor transmission.
In lego version main gearbox and range unit are located parallel to get shorter transmission. For shift lever axles put longitudinal brick with holes between gearboxes and then axles only half studs inside it. If width becomes a problem you can also put main gearbox and range unit sequential like in 12+4R-speed original setup but then transmission will become quite long. In pictures splitter is equipped with simple shift lever locking. If you need shift lever auto locking done by locking pin and rubber belt check YouTube video Building example. There is also one unwanted feature in lego version: gears B3-H and C2-L has same ratio 3,00. While gears have different ranges and different splitter positions we can accept that, can’t we? :-) And as an extra feature also this lego transmission can be equipped with remote shift splitter (crash box). You need micromotor, electric plate, gear rack and some other parts to get motorized sliding axle shifting for splitter. Check next pictures to see how to do it. You also need some fine tuning before use: move 12 teeth gear of the sliding axle a little bit forward so that it won’t mesh other gear wheels with its whole width. This way you can be sure that there is a neutral position between splitter’s low and high gear. Otherwise low and high gear will be connected at the same time during shifting which will temporarely lock the whole transmission and stop your tractor. And while this is crash box, not powershift, I don’t guarantee that it can complete the shifts in every driving situations.
Alternately you can replace splitter with C.7. 3-speed powershift for tractor version II and use it as 2-speed version. It’s made from two motors and a planetary gear and gives same gear step 1,20. More info about this powershift option is in page Planetary gears. T.5. Old 24+6R-speed tractor transmission version A & B, overall gear ratio 41,67: 6-speed main gearbox + 4+R-speed auxiliary Inspirer: Deutz-Fahr DX 86
This 24+6R-speed tractor transmission is related to 8+4R-speed transmission which has 4-speed main gearbox without a reverse gear added to auxiliary with ranges low, high and reverse. Now there are more gears in both gearboxes so this transmission contains 6-speed main gearbox and 4+R-speed auxiliary which has ranges high (H), medium (M), low (L) and creeper (LL) in forward plus medium range (R) in reverse. Shift pattern of main gearbox is simple but auxiliary’s is quite confusing so check ranges and their positions very carefully. Idea in range unit’s shift pattern is that medium and reverse range are in same line. So if you have to change driving direction often you can simply shift between these medium and reverse ranges without main gearbox shifting. There is available also version B with studless frame. It’s difficult to figure out the construction from pics so I recommend to download LDraw file. Changed frame is the only modification, axles and gears are same in both versions. But gear order in range unit makes it a little bit complicated. While low and high range with large step are in same line in shift pattern high range has first underdrive Su(12)-M(24) gear pair and then overdrive S(16)-XS(8) gear pair, and this can cause efficiency problems. If this problem occurs you can forget Deutz-Fahr’s gear order and simplify range unit. So here is alternative setup with redesigned range unit.
In this transmission medium range overlaps both low and high ranges so much that after low range’s top gear (L6) you could shift to high range’s 1st gear (H1). But medium range gives versatility in certain speed changes while you can avoid two stick shifts and it also gives more gears for field working speeds (4-12 km/h). On the other hand if you want to drive forward and reverse about the same speed you can shift between medium and reverse ranges without main gearbox shifting. And if you need to drive forward slower than in reverse that is possible with shifting between low and reverse ranges. This transmission concentrates on forward gears so reverse gears are its weak point. Although there are 6 reverse gears with small gear steps they cover only medium speed range. So there are no slow or fast reverse gears. Lack of fast reverse gears is not a problem but if you need creeper speeds the only driving direction is forward. Actually very slow speeds are usually needed only in forward but missing very slow reverse gears is a problem in this transmission. In Deutz-Fahr’s transmission creeper and low range don’t overlap each other but I couldn’t copy this feature to lego version. This is main reason why lego version has smaller overall gear ratio than Deutz-Fahr’s transmission. Creeper range is actually optional equipment so basic version of Deutz-Fahr has 18+6R-speed transmission. Also lego version can be built without creeper range and then overall gear ratio is 13,89. T.6. Old 30+15R-speed tractor transmission, overall gear ratio 126,00: 5-speed main gearbox + 3-speed range + 2+R-speed fwd/rev+split Inspirer: Deutz-Fahr Agroplus
This tractor transmission has 5-speed main gearbox, 3-speed range unit and 2+R-speed forward/reverse+split type auxiliary. So in this transmission reverse gear is combined with splitter, not with range unit like in earlier introduced 2+R-speed auxiliaries. Altogether you have 30 forward and 15 reverse gears in this transmission so in forward number of gears is doubled and gear steps are halved compared to reverse.
Idea in this transmission is that you can split forward gears to get more accurate working speed control but in upshifting procedure splitting is not useful while you will need also difficult two stick shifts. So in upshifting you start with low split, shift first only main gearbox and as last upshift shift to high split. In reverse you have only main gear steps but 15 reverse gears cover the whole speed range so you have also fast reverse gears. Range unit have not only low and high range but also creeper range and ranges don’t overlap which makes overall gear ratio very large and allows very low speed driving. This transmission gives 45 different gears but you can still have more gears so check big brothers of this transmission, next 45+45R-speed tractor transmissions. T.7. Old 45+45R-speed tractor transmission, overall gear ratio 162,00: 5-speed main gearbox + 3-speed fwd/rev+range + 3-speed splitter Inspirer: Deutz-Fahr Agroplus
This 45+45R-speed tractor transmission is inspired by Deutz-Fahr, which has 5-speed main gearbox, 3-speed range unit, 3-speed powershift (Low, Medium, High) and driving direction changer (shuttle). Range unit includes not only low and high range but also creeper range, which allows very slow driving and makes overall gear ratio very large. Powershift is introduced in chapter S.1. 8+4R-speed & 16+8R-speed so check it if you need more info. Lego version has couple of modifications: range unit and driving direction changer are combined to one auxiliary gearbox (named as fwd/rev+range) and powershift is replaced with 3-speed splitter. Splitter is sliding axle solution and its position locking is done by rubber belt. Turn splitter’s shift lever slightly to right to unlock it for shifting. Before use adjust rubber belt’s tightness with bricks so that locking pin stays down during driving but jumps up easily when you shift.
Normally tractor’s powershift is used only once during upshifting procedure. From stop to full speed when loaded upshifting sequence would be 6L-7L-8L-9L-10L-10M-10H. Idea in working is that you choose target speed with main gearbox and range unit when powershift is in high. But you move off with powershift in low and add speed with powershifts to medium and high. So if load gets too high and engine rpm drops you have two downshifts available. The reason why there are so many gears is that engine’s full power is normally only in single engine rpm. So a lot of gears gives you a lot of speeds where you can take advantage of engine’s full power. Next stage would be continuously variable transmission (CVT). This lego design is outdated while it has splitter representing powershift, I have already designed lego powershift transmissions. So for 45-speed transmission is better to check next 45+45R-speed version II which uses C.7. 3-speed powershift for tractor version II (page Planetary gears). This version I works best without splitter as basic 15+15R-speed design or with 3-speed lego powershift. For example these lego ratios suit straight to lego version of 15+15R-speed Lamborghini Crono tractor. T.10. Old 20+20R-speed tractor transmission, overall gear ratio 17,04: 5-speed powershift + 4-speed range Inspirer: Valtra N104 HiTech Check “N Series” and “N104 HiTech” on My Valtra Machine
This lego 20+20R-speed tractor transmission has 5-speed powershift and 4-speed range unit (ranges A, B, C and D). Range unit has same ratios as in 16+16R-speed tractor transmission. 5-speed powershift contains 3 motors and 2 planetary gear version III:s and is introduced in C.8. 5-speed powershift for tractor in page Planetary gears. So visit there to understand how this powershift works. You need a battery box and two forward-stop-reverse switches to operate this system. Picture called Wiring shows how you have to connect motors, switches and battery box.
Idea in this lego transmission is that you first choose suitable speed range with range unit. After move off you can enjoy powershiftable, remote controlled shifting with no need to stop for shifting and no H shift patterned shift lever. All you need is to choose driving direction with battery box’s switches and adjust speed with 2 switches. Idea for this transmission is taken from Valtra’s HiTech transmission which has 5-speed powershift, 4-speed range unit (optional equipment 2 creeper ranges) and powershuttle. It has no normal main gearbox or no shift lever with H shift pattern, all shifts are done by up & down buttons or automatic. When you change range while driving powershift shifts automatically most suitable powershift gear. You can choose automatic shifting even so that there is automatic shifting between ranges C and D, not only in powershift gears. There is also a driving mode in which you can adjust engine rpm:s where up- and downshiftings happen. I found these features in Valtra’s manuals but these are not all incredible features in Valtra tractors. All in all you can say today’s tractor transmissions are very hitech systems, not only just Valtra’s transmissions. Basic & Special Designs: C.4. Old 3-speed semiauto & transfer case ver IV Inspirer: Ford Bronco II This original 3-speed semiautomatic & transfer case version IV is based on off-road vehicle that has 3-speed automatic gearbox with torque converter and 2-speed part time 4x4 transfer case. In lego version 3-speed semiautomatic “main gearbox” is actually 2 motors and a planetary gear. For more information you can check B.8. 3-speed semiautomatic in Planetary gears.
This lego design shows only principle for these gearboxes, structure is not optimized and is quite space consuming. So it’s better to use alternative setup of this transfer case or to make request for more compact design. :-) Planetary Gears: C.8. Old 5-speed powershift for tractor 3 motors & 2 planetary gear ver III:s
This 5-speed powershift contains 3 motors and 2 planetary gears. Both planetary gears are version III with basic ratio 6,00. Motor 1 is connected to sun gear A1 and motor 2 to sun gear B1. Planet carrier 1 is connected to sun gear B2. Motor 3 is connected to sun gear A2 while planet carrier 2 works as output. This powershift is designed for 20+20R-speed tractor transmission that has 5-speed powershift and 4-speed range unit and is inspired by Valtra HiTech 5 transmission.
You need one battery box and two forward-stop-reverse switches to operate this system. Switch 1 controls rotating of motor 1 and switch 2 controls motor 3. Motor 2 orders driving direction and is wired direct to battery box, check picture called Wiring. Note that position reverse in switches 1 & 2 means that their motors run in different direction than motor 2. So switches in reverse with battery box in reverse means that motors 1 & 3 rotate actually in forward. Here is how you get the gears: To get 1st gear put both switches 1 & 2 in reverse, then move off with battery box’s switch forward or reverse. Shift to 2nd gear is that you stop motor 1 with switch 1. For 3rd gear you turn switch 1 into position forward. Now it’s time to use switch 2 to stop motor 3 and you get 4th gear. 5th gear is shifted by turning switch 2 into forward, so all motors turn in same direction and you have direct gear. Downshifting is this operation reversed so first you use switch 2 to get 4th and 3rd gear and then switch 1 to get 2nd and 1st gear. If you get confused and use switches in wrong order that’s not a problem. Only thing that happens is slightly different ratios in middle gears. For example switch combination reverse & stop still gives 2nd gear, reverse & forward 3rd gear and so on. So all in all this motor-gearbox unit gives 5 powershiftable gears with remote control shifting, no stopping for shifting, no shift lever with H shift pattern. Note that this version shows only principle how to build 5-speed powershift. To get it more compact and more usable to lego tractor you can try this: Locate motor 2 above motor 1 (remember to move also idler gear). Then move motor 3 to motor 2’s old place and change longer input axle. Move planetary gear 2 six or seven studs forward. This way you get shorter powershift. If height is not a problem you can do also this: locate motor 3 under motor 1 and move planetary gear 2 coaxial with it. Now you get also narrower version. Building tip: move planet carriers a little bit rearward on their axle to prevent possible collision problems between idlers and planet wheels. C.9. Old 9+9R-speed full powershift tractor transmission 3 motors & 2 planetary gear ver III:s
This transmission has incredible 9 remotely shiftable powershift gears in both driving directions. It contains 3 motors and 2 planetary gear ver III:s. First planetary gear has basic ratio 2,67 and second 1,67. Motor 1 is connected to sun gear A1 and motor 2 has ratio 0,67 before it’s connected to sun gear B1. Planet carrier 1 is together with sun gear A2. Motor 3 is connected to sun gear B2 and planet carrier 2 is output.
To operate this system you need one battery box and two forward-stop-reverse switches. Switch 1 is between motor 1 and battery box, switch 2 between motor 2 and battery box while motor 3 is connected directly to battery box. So, motors 1 & 2 are for speed control and motor 3 orders driving direction. Here is how you get the gears: In 1st gear both switches are in reverse. Shifts to 2nd and 3rd gear are done by moving switch 1 into stop and forward. Shift 3-4 is more difficult while you shift switch 1 back to reverse and switch 2 to stop at the same time. Shifts to 5th and 6th gear are again done by moving switch 1 into stop and forward. In shift 6-7 you move switch 1 into reverse and switch 2 into forward. Shifts to 8th and 9th gear are done with switch 1. How to connect motors, switches and battery box and how to select gears are described also in picture Wiring. 9 gears in both driving directions and overall gear ratio 10,00 are ok for a tractor transmission but gear steps are bad in this lego transmission. Steps 7-8 and 8-9 are far too small and step 1-2 is too large. It was very difficult to get usable ratios and gear steps and for a long time it looked like 9-speed powershift with proper gear steps and overall gear ratio is not possible at all. Tractor transmissions need geometrical gear steps while high gears are only for transportation and main work is done in middle gears. In some tractor transmissions steps in middle gears are even smaller than steps in high and low gears. Using tip: If you find compound shifts too difficult you can skip some gears. First upshift through gears 1-3 with switch 1 and then from 3rd to 6th and further from 6th to 9th with switch 2. This way you get 5 powershift gears and easy operating. Gear step 3-6 would be too large for real tractors but it doesn’t matter in lego use. Building tip: Use bushes in output axle to move planet carrier 2 a little bit to forward. It will move also part planet carrier 1 & sun gear A2 to forward but that is possible because 8 teeth sun gear A1 goes a little bit inside planet carrier 1. This fine tuning is to prevent possible collision problems between planet wheels and idlers. There is one possible problem in this transmission which I can’t test while I don’t have three identical motors: rotated motor starts to rotate stopped motor under high driving resistance. Motors are connected to planetary gears in such way that motor 3 shouldn’t be able to rotate motor 1 or 2 or motor 2 shouldn’t rotate motor 1. Most problematic is that if motor 1 starts to rotate motor 2. This means gears 4 and 6 when motor 1 is used and motor 2 stopped. If problem occurs you can put 24 teeth clutch gear together with axle pin with friction to mesh motor 2’s 24 teeth gear. This helps motor 2 to be stopped but it also reduces efficiency when motor 2 is used. So, if anyone builds this 9-speed powershift let me know how good it works. :-)
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