Skizz
10 µW
- Joined
- Jun 15, 2020
- Messages
- 5
*Previously posted in 'Technical' forum
Would be grateful for thoughts on an issue with a new BBSHD which has developed a rotational knocking noise under medium-to-high torque, occurring under both PAS and throttle.
Drive is a BBSHD with Lekkie BBSHD final drive cover V2, running at 52V and fitted to a Yuba Mundo Lux frameset.
Knock occurs around once per revolution but does occasionally vary in position and only happens under power; zeroing the PAS and grinding up some big climbs with leg-power only doesn't make it happen.
Linked vids show issue in motion and also the condition and engagement noise while stationary. Pulled the cover off today and discovered the outer thrust bearing-race was backwards but no visible damage. Final drive main bearing felt fine and final drive gear and pinion looked good so wiped everything down, re-greased (Aeroshell 22) and reassembled for test ride. All good for five miles until I pulled over to let a vehicle past and when pulling away again up a hill the knock started again. Excuse moderately bad language; couple of idiots decided to cut me up in one clip
[youtube]2VNdrLwiNiM[/youtube]
[youtube]GEkv4COi8Z0[/youtube]
Under throttle:
[youtube]YfqJefyVba0[/youtube]
Double knock:
[youtube]BAysIx73pHo[/youtube]
Double and single knock with PAS & throttle:
[youtube]JrQgeKZjkqk[/youtube]
Obvious stuff already checked is:
- Drive securely fitted and properly torqued with no free-play, pitching or rotation in BB shell
- Cranks torqued to spec with no play
- Pedals correctly installed with no freeplay or bearing issues
- New 42t Lekkie clone ring: tightened to spec torque
- New 9-spd chain and 11-42t cassette: correctly fitted, lockring torqued to spec and no play at cassette-to-freehub body interface
- Rear hub is Hope Pro 4 with steel freehub body with pawls and engagement ring in good condition and no play at freehub body to hub interface
First BBSHD I've worked on so thoughts greatly appreciated. Thanks
Would be grateful for thoughts on an issue with a new BBSHD which has developed a rotational knocking noise under medium-to-high torque, occurring under both PAS and throttle.
Drive is a BBSHD with Lekkie BBSHD final drive cover V2, running at 52V and fitted to a Yuba Mundo Lux frameset.
Knock occurs around once per revolution but does occasionally vary in position and only happens under power; zeroing the PAS and grinding up some big climbs with leg-power only doesn't make it happen.
Linked vids show issue in motion and also the condition and engagement noise while stationary. Pulled the cover off today and discovered the outer thrust bearing-race was backwards but no visible damage. Final drive main bearing felt fine and final drive gear and pinion looked good so wiped everything down, re-greased (Aeroshell 22) and reassembled for test ride. All good for five miles until I pulled over to let a vehicle past and when pulling away again up a hill the knock started again. Excuse moderately bad language; couple of idiots decided to cut me up in one clip
[youtube]2VNdrLwiNiM[/youtube]
[youtube]GEkv4COi8Z0[/youtube]
Under throttle:
[youtube]YfqJefyVba0[/youtube]
Double knock:
[youtube]BAysIx73pHo[/youtube]
Double and single knock with PAS & throttle:
[youtube]JrQgeKZjkqk[/youtube]
Obvious stuff already checked is:
- Drive securely fitted and properly torqued with no free-play, pitching or rotation in BB shell
- Cranks torqued to spec with no play
- Pedals correctly installed with no freeplay or bearing issues
- New 42t Lekkie clone ring: tightened to spec torque
- New 9-spd chain and 11-42t cassette: correctly fitted, lockring torqued to spec and no play at cassette-to-freehub body interface
- Rear hub is Hope Pro 4 with steel freehub body with pawls and engagement ring in good condition and no play at freehub body to hub interface
First BBSHD I've worked on so thoughts greatly appreciated. Thanks