How do you change the bearings on the left side wing on a tedder Model G4LP-UJ ?

no idea here .is this the model with the electric motor on the steering coloumn or the model with a motor behind the inner wing ? check them big fuses ? bearing tool ? you having a laugh i use a big hammer and a bigger one to hit the big one then i use the onld bearing to knock the new one in ... But then again i am a back street cowboy ex heavy truck mechanic .

Use a plastic spreader & slide under the side of indicator,you will feel a bit of plastic just slide spreader further until it realises the indicator, remove indicator twist out bulb holder ,change bulb, then just slide indicator back into place.

Its probably the left side, not only because you replaced the right side, but because it changes on right turns.
When you go into a right turn, the bearings on the left side are under more pressure and torque.
The front hub bearing goes bad more often than the axle bearing, so I would expect it to be the left front.

Quite often it is a bad wheel bearing, a lot of chevy's are notorious for them. A wheel bearing will usually create a growling type noise that is more prominent at around 40-60MPH. If its a wheel bearing you should notice a change in pitch when turning in one direction, for example if you have a bad right side wheel bearing it will be noisy driving straight ahead, then get louder when turning LEFT. If you turn right the noise softens. The weight distribution of the front end will be greater on the right side when turning left. Of course the works in the opposite direction. If the noise remains constant going straight and turning it could be a bad tire. Visually check the tire for pressure and bulges in the side wall. You didn't mention what type or model vehicle you have, because in some cases the rear wheel bearing could be causing the noise.

about $200 in parts,,,you can not do this at home,,,,,you need special tools to press yoke on and off and even then sometimes they bend,,,not a easy job,,,,,,i am a master tech and worked at saturn for 8 years and i hated doing these

is that the repeater bulbs on the side of the vehicle??
if so, will need to unclip the holders from inside the wing of the vehicle,, then push them out of the wing to change the bulbs. then just push the holders back once complete

There are two adjustment points (screws). For example left headlight: you will see one point near the end of left wing, at bottom side through a wing hole. This is for vertical plane headlight beam adjustment (up-down). Another one point is against water radiator side. This is for horizontal plane headlight beam adjustment (left-right).

Just a few hundred dollars. Think of the bearing
cost, plus labor and overhead.

you have to pull off the driveshaft and take it apart then press off the carrier bearing