A customer brought in the rear wheel of a Nomu Lab Wheel No. 7 (custom wheel brand) for service.
The hub is a leaf hub, but there's play in the freebody
and it makes a terrible noise when riding.
Pushing the freebody upward ↑↑
Pulling the freebody downward ↓↓
There's definitely play, but
the wheel truing was possible under no load.
After truing the wheel,
I removed the right end nut and found
the outer bearing on the freebody was damaged—
the outer race was pressed into the freebody,
and the bearing balls, seal, and retainer ring
had fallen inside.
I removed the outer race of the outer bearing.
Most freebodies assemble parts in this order:
inner bearing →
spacer that only presses the inner race of the inner and outer bearings →
outer bearing
But this freebody has the inner bearing pressed in from the inside.
It didn't absolutely require replacement,
but since it was sticking out slightly from where it should be fully seated,
I decided to replace it.
Both are 6802 size, but
the inner one is a non-contact type,
and the outer one is a contact type.
This is the rear wheel of a Nomu Lab Wheel No. 5
that the same customer brought in at the same time.
The hub rotation was stiff, so
when I removed the freebody,
the rear wheel in "front wheel condition" with only hub body bearings
had no particular damage and spun smoothly.
Almost all bearing deterioration
originated from the freebody side.
There's rust around the pawls,
and the spacer that prevents the freebody from bottoming out on the hub body
has rust bloom on its inner side facing the freebody.
When I tried to spin the freebody with my finger inside,
both inner and outer had rusted solid into a bushing state.
I removed both inner and outer bearings.
I cleaned the parts as thoroughly as possible,
and replaced the bearings.
The hub is a leaf hub, but there's play in the freebody
and it makes a terrible noise when riding.
Pushing the freebody upward ↑↑
Pulling the freebody downward ↓↓
There's definitely play, but
the wheel truing was possible under no load.
After truing the wheel,
I removed the right end nut and found
the outer bearing on the freebody was damaged—
the outer race was pressed into the freebody,
and the bearing balls, seal, and retainer ring
had fallen inside.
I removed the outer race of the outer bearing.
Most freebodies assemble parts in this order:
inner bearing →
spacer that only presses the inner race of the inner and outer bearings →
outer bearing
But this freebody has the inner bearing pressed in from the inside.
It didn't absolutely require replacement,
but since it was sticking out slightly from where it should be fully seated,
I decided to replace it.
Both are 6802 size, but
the inner one is a non-contact type,
and the outer one is a contact type.
This is the rear wheel of a Nomu Lab Wheel No. 5
that the same customer brought in at the same time.
The hub rotation was stiff, so
when I removed the freebody,
the rear wheel in "front wheel condition" with only hub body bearings
had no particular damage and spun smoothly.
Almost all bearing deterioration
originated from the freebody side.
There's rust around the pawls,
and the spacer that prevents the freebody from bottoming out on the hub body
has rust bloom on its inner side facing the freebody.
When I tried to spin the freebody with my finger inside,
both inner and outer had rusted solid into a bushing state.
I removed both inner and outer bearings.
I cleaned the parts as thoroughly as possible,
and replaced the bearings.