Good old Lego builder Posted February 9, 2015 Posted February 9, 2015 (edited) Yesterday my son wanted to play with the 42009 crane. When we extended the boom that didn't work quite well anymore. The gear at the bottom starts to slip. I can't really find or solve the problem. I appears that the wormgear somehow gets stuck, the one at the top of the boom. When i help it extend manually, a little pull, then it continues for a few centimeters and then the same thing happens. Any idea what the problem could be? Edited February 9, 2015 by Good old Lego builder Quote
nychase Posted February 9, 2015 Posted February 9, 2015 I don't actually own a 42009 but what you are describing sounds like binding on the pulley string between the inner and middle booms. Sounds like the string is getting stuck. Quote
Good old Lego builder Posted February 9, 2015 Author Posted February 9, 2015 Thanks, I will check that an d let know if it is fixed Quote
Blakbird Posted February 9, 2015 Posted February 9, 2015 I don't remember if there is a clutch gear in that gear train, but if there is it could be slipping. This is usually caused by high friction somewhere in the gear train. Quote
Good old Lego builder Posted February 9, 2015 Author Posted February 9, 2015 There is one at the bottom of the boom. There is a lot of tension somewhere. Quote
cehtunger Posted February 10, 2015 Posted February 10, 2015 I had similar problem. The boom didn't move smoothly, and it looked like the problem was in that top worm gear. I just switched that gear to other side and after that it worked. Weird... And yes, definetely check that string! One other tought: check in the arocs topic about universal and constant velocity joints and if you connected them properly on the lower part of the boom. Quote
Good old Lego builder Posted February 10, 2015 Author Posted February 10, 2015 It's not the rope, I checked that. I' ll try to switch the worm gear, that is where the trouble seems to be. I did read about that and the joints are connected in the right way. Don't know if that was in the manual or just a coincident... Quote
Good old Lego builder Posted October 15, 2015 Author Posted October 15, 2015 Well, few months later now, and the problems with my 42009 aare worsening. There seems to be a general lack of power. Extending the outriggers works, kind of. Lowering them or lifting them starts very slow and then kind of stops. The motor just blocks it seems. Same thing for extending the boom. It just won't extend anymore. However, I don't here the clutch gear. There seems just not enough power to get the gears running. I have changed the batteries, exchanged the batterybox, all with the same result. What is happening? I have build the set, it has been on the shelve for all that time, never changed anything, and sometimes used it. It worked perfectly fine untill a made this original post..... Any help would be welcome. Quote
Imanol BB Posted October 15, 2015 Posted October 15, 2015 Hi, with what you are describing it sounds like there most be a wrong placed gear or something, maybe in the gear box, but it can be anything else, you can do some things: 1) Check if the motor its in good conditions (has enough torque and speed, isnt beign forced), if not try to change it. 2)Check the gearbox (no wrong placed or stuck gears) 3)Check if there is any powered axle being forced (stuck somewhere or wrong placed) However maybe you could upload a video to see or hear if there is any problem that can be fixed. Quote
aminnich Posted October 15, 2015 Posted October 15, 2015 I had the same thing happened to me, it must've been something in the gearbox because I rebuilt it and then it worked Perfectly. Quote
MaxSupercars Posted October 15, 2015 Posted October 15, 2015 4.) Check the dust layer on your crane... :D Max... Quote
Good old Lego builder Posted October 15, 2015 Author Posted October 15, 2015 Max, I was wondering about that actually. Could dust really have this effect? Quote
MaxSupercars Posted October 15, 2015 Posted October 15, 2015 (edited) It was not a joke... :) I bought used assembled 8258 crane truck and it didn't work smoothly... I could smell a lot of dust on it... I disassembled it, washed all parts and assembled back... And it worked then fine... It's just an idea, must not help... :) Max... Edited October 15, 2015 by MaxSupercars Quote
Good old Lego builder Posted October 15, 2015 Author Posted October 15, 2015 Well the crane not extremely dusty, but it is the only difference since building it. It cllected a bit of dus over the past few years. Maybe I should rebuild the upper structue. And clean it...... Is there a way to test the motor? Quote
Imanol BB Posted October 15, 2015 Posted October 15, 2015 if you have any other motor, you can compare them, or maybe you can look in Sariel´s channel, i think he has a video where he shows the force of each motor, and about the dust, yes, it can have a massive effect, specially in legos with a lot of working parts, it happened to me, i had make the 8110 it was working perfectly, and i left it like 3 months, then i wanted to play with it, i recharged the batteries but it was like if the batteries were half charged, then i saw a lot of dust, and i decided to put out the motor, when i clutched the funcions, i tried to rotate the axle from the pto and it was really hard to do it, so i decided to rebuild the truck, and it worked perfect, and then i found that the dust has a really big effect in the parts, so i would recommend to rebuild the crane, to see if it gets any improvement. Quote
Kman860 Posted October 16, 2015 Posted October 16, 2015 Could you kill a motor by trying to, say, turn the axles that extend the outriggers while the motor is running them? If so, I might have ****ed up... Quote
Good old Lego builder Posted October 18, 2015 Author Posted October 18, 2015 I have disassembled the boom. Couldn't spot a mistake. I then rebuild it. It seems to work fine now, at least manually. I guess it must have been the rope that caused the troubles but no idea what was wrong with it. Now I have disassembled the gearbox and started to rebuild it. Hope this solves most problems. Quote
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