Spun Bushing

[C.J.]

My A&Ps gave me the enviable task of greasing the landing gear. I own & used a LockNLube coupler & the 8-piece accessory kit. 4 of 7 zerks on R MLG and 1 of 7 on the L MLG would NOT take grease. Next step, clean out the zerks and free up the bushing grease channel with a wire. Upon removal of the zerk on the L-MLG I found that the bushing had spun. I did not continue to remove the 4 zerks on the R MLG to see their status at this time. The plane was on the jacks when I serviced it.

My question is, what is the fix for a spun bushing?

For reference here are the affected bushing/zerk locations and p/n from the IPC starting on page 98/278

LH-MLG   

Index 22-3  bushing  p/n 914020-19 (the outboard zerk)

RH-MLG 

Index 22-1   grease fitting p/n MS150001-1 at the Main Spar Attach Box

Index 22-16   bushing p/n 914020-17

Index 22-3   bushing p/n 914020-19 (the inboard zerk)

Index 22-5   bushing p/n 914007-5

 

Thank you in advance

 

[PT20J]

Are you really sure it is spun? Those bushings are pressed in and to spin it would take a lot of torque. 

I've found that partially raising the gear and moving the main wheels up and down with one hand while operating the grease gun with the other will often get a troublesome zerk to take grease.

[C.J.]

4 minutes ago, PT20J said:

Are you really sure it is spun? Those bushings are pressed in and to spin it would take a lot of torque. 

I've found that partially raising the gear and moving the main wheels up and down with one hand while operating the grease gun with the other will often get a troublesome zerk to take grease.

I'm basing my conclusion that it spun given that no grease channel opening was visible with the zerk removed.

I'll be at the hangar tomorrow and try moving the main wheels as you suggested.

I'll need my mechanic to move the gear while I try the upper two zerks. I think I can manage the two zerks on the gear's "knee" unassisted. 

Thanks for the tip.

[EricJ]

I just did mine as well, including removing and cleaning out a few zerks.   Some of the joints are just difficult.   

[PT20J]

8 hours ago, C.J. said:

I'm basing my conclusion that it spun given that no grease channel opening was visible with the zerk removed.

I doubt that the holes in the channel would line up with the zerk. I believe that's the purpose of the channel - to route grease from the zerk to the holes that allow grease to flow from the channel to the bearing surfaces. @N201MKTurbo probably knows for sure.