PS Magazine - TB 43-PS-711
PS, The Preventative Maintenance Monthly
ISSUE 711
FEBRUARY 2012
16
PS 711
FEB 12
17
PS 711
FEB 12
o
perators, follow the word in TM 5-3805-248-14&P-1 when you check the
hydraulic oil with the scraper idling and the cylinders retracted. Checking oil that
way saves seals and the hydraulic reservoir’s sight glass by making sure you don’t
overFll the reservoir.
Why idling? Oil expands as it warms up. Warm oil registers a little higher on the
gauge than cold oil.
OK, but why retract cylinders? Oil used to extend
the cylinders isn’t in the reservoir to be measured.
It’s in the cylinders doing its job. If you measure
the tank with the cylinders extended, it looks low.
If you overFll the tank for either reason, pressure
builds up—blowing seals. Too much oil has even
been known to blow out the hydraulic reservoir’s
sight glass.
So, before you add oil, make sure the scraper is
in the parked position with all cylinders retracted.
Let the scraper warm up a few minutes. The
hydraulic oil level should show between the ADD
and ±ULL marks.
If you overFll the reservoir, remove the excess
with an AOAP vampire pump, NSN 4930-01-119-
4030.
± But±you±don’t±have±to±replace±the±
primary±flter±element±every±time±the±
restriction±indicator±turns±red.±Save±the±
cost±oF±a±new±element±by±cleaning±the±
old±one±with±compressed±air±or±warm,±
soapy±water.
± When±you±use±air,±blow±out±From±the±
inside±oF±the±element,±since±the±dust±is
in±and±on±the±outside±oF±the±flter.
± Rinse±away±the±soap±with±warm±
water±and±let±the±element±dry±
completely±beFore±you±put±it±back±in±
the±crane.
± Replace±the±flter±element,±NSN±
2940-01-438-5680,±aFter±six±cleanings±or±
iF±it’s±ripped,±torn±or±won’t±come±clean.
± Then±hold±the±nozzle±at±an±angle±to
blow±oFF±sand±From±the±outside.±That±keeps±you±From±damaging±the±paper±element.
± To±get±rid±oF±oily±sand,±you’ll±need±to±wash±the±flter±element±with±warm±water±and±
soap,±NSN±7930-00-282-9699.
± IF±the±indicator±still±shows±red±
aFter±cleaning±the±flter±element,±tell±
your±mechanic.±Something±is±wrong.
For loose dirt, use compressed air
For oily dirt, use detergent and warm water
Air
Filter
Reminder
621B Scraper…
foil
too much
oil
22-Ton Crane…
Air
Filter
Reminder
Oil level should be
between ADD and FULL
don’t forget
to
retract
my
cylinders this
time!
right!
I don’t
want you
to blow
another
seal!
desert sand
and fine
dust will
end up in my
air filter,
no matter
what!
Operators!
711 16-17.indd
1-2
1/4/12
5:44 PM
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