PS Magazine - TB 43-PS-573
PS, The Preventative Maintenance Monthly
ISSUE 573
AUGUST 2000
PS 573
37
AUG 00
PS 573
36
AUG 00
ervicing the wind-
shield wiper converter
on UH-1 and UH-60
helicopters is a chore.
You have to take apart
the whole wiper con-
verter to do it. That’s
why many of you put
off the service until the
helicopter goes into
phase maintenance.
Don’t wait. A delay
could cause problems
when the wipers are not used for long
periods of time. The longer the delay
in using the wipers, the greater the po-
tential that the grease will harden and
freeze the converter gears. That would
lead to burned out wiper motors in both
aircraft—and broken flex shafts in the
UH-60.
The Aviation and Missile Command
(AMCOM) has approved a unit-level
modification that turns the wiper ser-
vice into a semiannual lube service.
With your general aircraft mechanic’s
toolbox in hand and ready access to
the AVUM Shop Set No. 2, here’s what
to do:
1.
Disassemble the windshield wiper
converter per Para 12-13 of TM 55-
1520-210-23-2 (Sep 87), for the UH-
1, or Para 12-4-36 of TM 1-1520-237-
23-7 (May 98) for the UH-60.
2.
Clean out the grease and inspect
the wiper gears for cracks, chips or
missing teeth. Replace gears that are
damaged.
UH-1, UH-60 . . .
7.
Drill a fourth hole in the bottom
center of the converter body with a
number 31 drill bit. Then, press the
grease fitting, NSN 4730-01-077-4893,
into place.
8.
Reassemble and reinstall the wind-
shield wiper converter assembly.
9.
Lube the converter using aircraft
grease, NSN 9150-00-944-8953, until
new grease comes out of the relief
valve. Be sure to wipe off the excess
grease. Do this lube service semi-
annually.
Keep this procedure handy until you
see it in the tech manuals.
5.
Make threads for the relief valve,
NSN 4820-00-826-6465, using a
1
/
8
x
27 NPT tap.
6.
Install the relief valve.
3.
Once the converter is cleaned and
the gears either pass inspection or are
replaced, drill holes in the center of
the converter nameplate and idler cover
plate using a number 59 drill bit. This
lets the air out and allows the grease to
completely cover the gears.
Drill R.339
on center.
Tap
1
/
8
x27
NPT for
relief valve
can't see
without
wipers
!
where's the
airfield!
Drill holes in center of covers
4.
Drill a third hole in the top center
of the converter body using drill bit
size R .339.
5
/
16
"
1
1
/
8
"
TOP
28
/
32
"
1
/
4
"
Drill #31 on center
for zerk fitting
BOTTOM
UH-60
Have your wipers been modified?
UH-1
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