Rutland 913 Yaw repair

[ecogeorge]

I need to remove the yaw bearing assembly in order to drill a bolt from the inside out.
Had to cut bolt off, then stud extractor broken in hole
Need to remove the lower piece where the wire comes out to get in a drill bench.
I have removed Allen key and have 3/4mm movement up and down will not shift.
Can see no circlip up the end where the wire protrudes.
Nothing to see in where slip rings are.
Nothing hidden under rectifiers
Tried gentle tap with hammer but nope!
Any one any experience?

[Fintray]

Where on the assembly is the broken bolt?

[ecogeorge]

Look at first pic with slip rings ....... broken bolt just visible on bottom half.
The bottom spigot for eant of a better word is designed to fit inside a 41mm ID Tube. 2 m10 x 16mm allen key botls screw through tue into spigot.
Got the other side out - this one would not move so cut off and tried to drill thread out -was stainless but got a hole almost through. Crappy silverline thread extractor broke in hole !!
I could drill and tap another hole i guess -but thought if i drill from the hole where i got the bolt out (180 degrees) i could retain thread.
Reason i cant is cable in center so wish to remove piece to drill . Make sense ??
George

[ecogeorge]

I'm trying to reove the blue bit......

[ecogeorge]

This page shows mounting . One of the bolts (2 shown) needs drilling out of the top spigot.

[Fintray]

Ok, one way to try to remove the bolt would be to sit a 10mm nut directly above the hole then MIG weld the broken part to the nut, then try removing it by turning the nut (the heat normally helps to free it off). Failing that it could be put in a milling machine and the broken part could be milled out and re-tapped.
I would imagine that the bearings (either side of the slip rings) have been pressed in and will require a bit more than a gentle tap with a hammer to release them. I would hold the round bit in a vice and give the flat part a sharp hit or two, some heat applied to the main body would also likely help.

[ecogeorge]

Accept that BUT .......
no broken bolt protruding and i don't weld......
Need to remove the bottom (blue) bit because there is a cable running through it.........

[openspaceman]

If it is the bit I have circled in blue and it is an ss bolt with a snapped extractor in aluminium the modern way is to spark erode a hex or torx hole into it and then unscrew it with an allen key or torx driver, probably too expensive even if you can find a workshop that does it.

You could try using a 1mm cut off disc to make a slot and then use an impact driver with an old fashioned straight bit but it would cut into the tube somewhat

[Joeboy]

Slot out a deep, black (thickwall) impact socket? Or is the recess diameter too narrow for impact socket?

[ecogeorge]

It is the bit circled in blue.
If i could reomve the yaw bearing assembly i could drill through from the other side as the other removed bolt is 180 degress.
The cable in the center is the problem.
Just a thought i wonder if i could sleeve the drill bit so it didnt chew the wire ??