GWS gearbox
#1
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From: saratoga,
CA
I bent my shaft on my eagle 400 today. (electric). I am using a 400 speed brushed, with the standared GWS equiptment. I can''t figure out how to get the shaft out to replace it. Is it possible. Well............ it must be becasse they sell the SHAFT REPPLACMENT!!!
!!!!!!
anyway, please help!
thanks
!!!!!!

anyway, please help!
thanks
#2
Senior Member
This is from my files. How to remove the shaft and straighten it. Ignore the parts you don't need.
To take off the shaft:
1. Remove propeller. Unplug motor from ESC.
2. Remove 2 screws holding motor in the gearbox (do this in bag too if you want--they are rather hard to find if they fall).
3. Take out motor. Note how the e-clip looks when it is attached to the shaft (back of gearbox on the shaft)
4. Remove gearbox from plane if not already done so. Put gearbox in bag.
5. Get a small slot screwdriver (I think I used a 2mm precision head), place it in the e-clip so when you twist the screwdriver the clip will pop off.
6. Remove washer under the e-clip and put aside.
7. Remove shaft. The spur gear will come out with it.
8. The bearings should remain in place, but be aware that they may come out. One of mine came out as my shaft was really bent.
9. Note how the spur gear fits on the shaft. Mark both sides of the shaft with a felt marker for reference if you think you may mess up reinstalling the spur gear on the new shaft.
9. I put the shaft and spur gear on top of a slightly opened vise, shaft vertical between the jaws. Do not clamp it in. The jaws support the spur gear. Only open the jaws as wide as they need to be. You want to support the spur gear as close to the center as possible.
10. With a hammer, tap the shaft out.
11. Set the new shaft next to the old one and mark where the spur gear goes on.
12. Put new shaft in spur gear.
13. With same hammer, tap the new shaft into the spur gear until the lines match up.
BE CAREFUL--you want to pound so the force goes directly down the shaft through the hole in the spur gear. A force from the side is what bent it in the first place. I suppose you could wet it with water to lube it a bit so it goes in easier. The water will dry away leaving no slippery residue to dislocate the gear later.
14. Reinstall the new shaft into gearbox. Put on washer, e-clip, yadda, yadda, yadda.
To get the e-clip back on, I place it in the groove on the shaft with my fingers and then use needle nose pliers to pop it back in. Make sure it is in properly. You don't want to lose it in flight!
15. Lastly, I got this info for Great Planes gearboxes, but do it with the GWS ones as well. Don't know how important it is, but I do it anyway: With the motor back in the gearbox, before you tighten the screws to secure it in, take a small piece of paper (I use computer paper) and put it between the pinion gear and the spur gear. I place the piece of paper up to the gear and spin it in. Tighten screws, spin paper out. Reattach motor wires.
Go flying!
To take off the shaft:
1. Remove propeller. Unplug motor from ESC.
2. Remove 2 screws holding motor in the gearbox (do this in bag too if you want--they are rather hard to find if they fall).
3. Take out motor. Note how the e-clip looks when it is attached to the shaft (back of gearbox on the shaft)
4. Remove gearbox from plane if not already done so. Put gearbox in bag.
5. Get a small slot screwdriver (I think I used a 2mm precision head), place it in the e-clip so when you twist the screwdriver the clip will pop off.
6. Remove washer under the e-clip and put aside.
7. Remove shaft. The spur gear will come out with it.
8. The bearings should remain in place, but be aware that they may come out. One of mine came out as my shaft was really bent.
9. Note how the spur gear fits on the shaft. Mark both sides of the shaft with a felt marker for reference if you think you may mess up reinstalling the spur gear on the new shaft.
9. I put the shaft and spur gear on top of a slightly opened vise, shaft vertical between the jaws. Do not clamp it in. The jaws support the spur gear. Only open the jaws as wide as they need to be. You want to support the spur gear as close to the center as possible.
10. With a hammer, tap the shaft out.
11. Set the new shaft next to the old one and mark where the spur gear goes on.
12. Put new shaft in spur gear.
13. With same hammer, tap the new shaft into the spur gear until the lines match up.
BE CAREFUL--you want to pound so the force goes directly down the shaft through the hole in the spur gear. A force from the side is what bent it in the first place. I suppose you could wet it with water to lube it a bit so it goes in easier. The water will dry away leaving no slippery residue to dislocate the gear later.
14. Reinstall the new shaft into gearbox. Put on washer, e-clip, yadda, yadda, yadda.
To get the e-clip back on, I place it in the groove on the shaft with my fingers and then use needle nose pliers to pop it back in. Make sure it is in properly. You don't want to lose it in flight!
15. Lastly, I got this info for Great Planes gearboxes, but do it with the GWS ones as well. Don't know how important it is, but I do it anyway: With the motor back in the gearbox, before you tighten the screws to secure it in, take a small piece of paper (I use computer paper) and put it between the pinion gear and the spur gear. I place the piece of paper up to the gear and spin it in. Tighten screws, spin paper out. Reattach motor wires.
Go flying!



