PS Magazine - TB 43-PS-607
PS, The Preventative Maintenance Monthly
ISSUE 607
JUNE 2003
If you pound on the tie bar pins
instead of tapping on the pins, you can
misalign the pins and they won’t seat
properly in the pitch housing and the
hub shaft. Then the retaining washer
won’t seat properly on the pin in the
hub, either. You’ll wind up with dam-
age to the rotary-wing head and the
pitch housing.
Also, make sure you never tap on the inner surface of the pins, either. That’ll push
the inner portion out of tolerance. Then you’ll have to replace them. If the pins are
dropped on a hard surface, forget about tapping on them, too, because the pin’s outer
circumference will be flared out.
PS 607
JUNE 03
38
C
hinook repairers, tie bar
pins are
not
like a Timex.
They can’t take a lickin’
and keep on tickin’!
So don’t pound them
in! Tap, tap, tap lightly is
the way to go when you
install tie bar pins into the
rotary-wing head, like it
says in Chapter 5 of TM
1-1520-240-23-6.
You have to remove the
tie bar pins from the pitch
housing and the hub shaft
to visually inspect the tie
bar. To replace pins, place
the phenolic drift on the
outer rim of the pins and
tap in lightly with a soft
mallet.
Keep in mind
that beat-up
pins cost you
about $63 a pop
to replace. So
tap ‘em, but
don’t beat ‘em
in. That’s the TM
way to go.
Tap tie
bar pin
on outer
edge
Damaged pin
can’t
be used
Damaged
Undamaged
If pin is
damaged,
retaining
washer
won’t seat
properly
when pin
is installed
…and
keep on
tickin!
throw in
the towel,
pin. you’re
through!
CH-47D…
I’m
tough! I
can take
a lickin’…
607. 38-39 (C)
4/24/03
3:20 PM
Page 1
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