PS Magazine - TB 43-PS-631
PS, The Preventative Maintenance Monthly
ISSUE 631
JUNE 2005
PS 631
JUN 05
31
22-Ton Crane…
O
perators, fine desert sand is everywhere. It will end up in the crane’s air filter no
matter what.
Just remember that you don’t have to replace the primary filter element every
time the restriction indicator shows 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
sand is “in” and “on” the outside of
the filter.
Then hold the nozzle at an angle
to blow loose sand from the out-
side. That keeps you from damag-
ing the paper element.
To get rid of oily sand, you’ll
need to wash the filter element with
detergent, NSN 7930-00-282-9699,
and warm water.
Rinse away the soap with warm
water and let the element dry before
you put it back in the crane.
Replace the filter element, NSN
2940-01-438-5680, after six clean-
ings or if it’s ripped, torn or won’t
come clean.
If the indicator still shows red
after cleaning the filter element, tell
your mechanic.
For loose
dirt, use
compressed
air
For oily dirt, use detergent and warm water
Indicator
shows
RED after
cleaning
the filter
element?
Tell your
mechanic
keep this pm
pointer in mind
as the desert
wind blows!
T
he alcohol reservoir on the crane’s air brake system is getting a bad rap.
Some well-meaning operators walk around the vehicle before the day’s run. While
in a hurry doing the checks and services, they open the petcock for the alcohol reser-
voir, because they think it’s an air tank for the air brake system. So, the alcohol is
drained out of the reservoir. But the reservoir is supposed to be filled year-round.
PS 631
JUN 05
30
22-Ton Crane…
Without alcohol, the
air brake system
can’t
do its job very
well. Here’s why…
The solution is real
simple.
Don’t
drain the
alcohol evaporator—
it’s not an air tank for
the crane’s air brake
system!
•
Alcohol keeps
moisture from freezing
up inside the vehicle’s
air brake system.
•
Water expands
when it turns to ice.
That kind of pressure
will burst most
anything. You can
lose your brakes and
control of the vehicle.
One more thing
before I’m ready for
the day’s run…
open
the air tank for the
air brake system.
Soldier!
that petcock
is
not
what
you think it is!
it’s for the
alcohol
reservoir.
then
what’s
it for?
631.30-31(C)
4/28/05
6:40 PM
Page 1
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