PS Magazine - TB 43-PS-557
PS, The Preventative Maintenance Monthly
ISSUE 557
APRIL 1999
PS 557
23
APR 99
TM 9-1375-215-13&P (Oct 97), the new TM for the
mine clearance line charge (MICLIC), now calls for semi-
annual replacement of the hand pump’s hydraulic fluid.
That’s no easy task, since the pump must be removed
to drain the fluid.
Help is on the way, though. A new hand pump that has
a drain plug is now available with NSN 4320-01-226-
1226. Just pull the plug and the old oil is gone in minutes.
The new hand pump also has a dip stick for checking
the oil level, a rubber boot to protect the rocker arm, and
a cap with a lip that keeps the boot in place.
Note the NSN change for the pump. It’s Item 6 in Fig 7
of the TM.
130G Grader . . .
Lower Blade for Level Reading
M9 Armored Combat Earthmover . . .
MICLIC . . .
Setting the blade down on a 130G
grader gives you an accurate reading
and saves seals and hydraulic lines.
Leaving the blade up can act like a
slight vacuum in the cylinders that raise
and lower the blade and circle drive.
That “vacuum” holds oil in the cyl-
inders, causing low readings in the res-
ervoir. Oil added to fill the reservoir
puts too much pressure on the hydrau-
lic system—blowing seals and lines.
Play it safe. Make sure the blade is
down before you eyeball the oil level
in the grader’s hydraulic reservoir.
Operators,
before
you eyeball the fluid
level in my
hydraulic oil reservoir,
set
my blade
down
.
this track
isn't
loose
, so
why
did
the
actuator mount
bolts loosen
?
normal use
also
loosens those
bolts. you must check
them
often
.
Loose bolts? Tighten!
New hand pump
makes draining easier
Lower blade before checking fluid level
t’s not just track slap that loosens your M9 ACEs roadarm actuators; normal
use will loosen them, too.
Loose track rubs against the actuator mounting bolts, backing them out and
shearing them off. If enough bolts shear off, the loosened actuator can damage
the hull.
Normal use also loosens the bolts over time, leading to the same damage.
So, eyeball the bolts often for looseness. If they’re loose, tighten them and
continue to operate until your mechanic can replace them.
Roadwheel #1 (at the front of the ACE) has the new actuator mounting rings
installed, so you’ll need to use NSN
5305-00-724-7224 as the replacement
bolt. Roadwheels #2, #3 and #4 use self-
locking bolt, NSN 5306-01016-8296.
Look for any marked or scraped
areas where bolts may be damaged. If
the bolts are damaged or missing, get
them replaced with new bolts before you
continue to operate. Never re-use old
actuator bolts; they will not hold.
PS 557
22
APR 99
Back to Top Back to Top
