PS Magazine - TB 43-PS-619

PS, The Preventative Maintenance Monthly

ISSUE 619

JUNE 2004
PS Magazine - TB 43-PS-619 - Page 14 of 33
Air Governor
Another breather valve to keep an eye on is the one that mounts into the engine’s
air governor.
Engine vibration loosens and wears out the cap. Some caps vibrate completely out
of the governor. When that happens, dirt gets into the air governor causing it to stick
open. That lets air pressure build up and blow the seals in the air relief valves on the
brake system’s air tanks. Then your grader’s air brake system can’t build up air pres-
sure.
So during your PMCS
checks with the engine
access door open, eyeball the
breather valve. Grab it to
make sure it’s not loose.
Then tap it a few times to
make sure it bounces back.
If the cap won’t turn or
bounce, get a new breather
valve with the same NSN.
JUN 04
24
130G Grader…
Let the Valves
Breathe
Circle Drive
The breather valve on the grader’s circle drive gear case
gets caked with mud during operations. A clogged valve lets
pressure build. Eventually, something has to give, and it’s
usually the gear case’s seal. When the seal goes, the lube is
bound to follow. End result: component failure, namely the
circle drive.
Use a clean rag to wipe off the breather valve. Then twist
the valve’s cap to loosen any dirt stuck inside. Tap the cap to
knock dirt out. Inside the cap is a spring, so the cap should
bounce when you tap it. If the cap won’t turn or bounce, get
a new breather valve with NSN 4820-00-994-3015.
MKII Bridge Boat Dipstick
Use NSN 6680-01-232-0102 to get the engine oil dipstick. This NSN replaces the parts
info shown as Item 1, Fig 63 of TM 5-1940-277-20P.
…or you’ll be
looking at down-
time to get
seals
replaced.
Tap governor
breather valve
Twist breather to clean out dirt
HEY, MAN.
..ARE
YOU
ALL RiGHT?
YOU NEED AN
iNHALER OR
SOMETHiNG?
NO…
{GASP!
WHEEZE!}
…I JUST NEED
SOMEONE TO
DO PM ON MY
BREATHER
VALVES!
You’ve
got
to
let your grader’s
breather valves
breathe,
operators…
619. 24-25 (C)
4/29/04
6:01 PM
Page 1
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