PS Magazine - TB 43-PS-691
PS, The Preventative Maintenance Monthly
ISSUE 691
JUNE 2010
13
PS 691
JUN 10
Unit commanders should
deadline all HEMTT -A4
models that haven’t had a
hydraulic
line
inspection
and
corrective
repair
performed yet!
Park these
HEMTTs and set the 24V
battery disconnect switch to
OFF. Otherwise, a problem
with electrical fres could
destroy the HEMTT -A4 or
kill or hurt Soldiers.
Hydraulic lines rubbing on the positive starter terminal is the root cause o± these
fres. The outer layer o± the hose eventually wears through to the metal rein±orcements.
That leads to arcing between the starter terminal and the hydraulic line, which sets
leaking hydraulic fluid on fre.
Three Repair Options
1)
Emergency
fx:
This
option
is
only
approved ±or A±ghanistan. Just use hose
ties to isolate the hydraulic hoses ±rom the
starter terminal. Then do the interim fx as soon
as possible.
2)
Interim fx:
For this option, worn hoses
shall be replaced be±ore applying the interim
fx to the vehicles. A stando±± bracket and
hose-restraining straps attach the hydraulic
lines to the charge air cooler posts. This
keeps the lines away ±rom the starter terminals
and other electrical connections. Use this
method until the permanent fx can be applied.
3)
Permanent fx:
As parts become available,
the contractor will apply this permanent solution
±or your unit’s HEMTT -A4 fleet. They’ll lock
the hydraulic and electrical routings into a
single confguration using pillow blocks and
P-clamps to secure the hoses.
HEMTT -A4s…
Electrical Fires
Deadline
Vehicle
there should be at least 1
1
/
2 inches of
clearance between the positive starter
terminal and any hydraulic hose.
tacom
soum 10-003
addressed a
fire hazard
on hemtt -a4
models.
by now, your unit
should have
fixed
that problem, but
if not, here’s what
needs to happen
right now!
Keep 1
1
/
2
- to 4-in
clearance between
starter post and hoses
Ensure 2001 line and hydraulic
steering line are not rubbing here
2001 line
Hydraulic steering supply line 2301
man-O-man!
tell me
again how this
happened?
somebody didn’t
read tacom
soum 10-003 on
fire hazards on
hemtt -a4s.
if they
had, we
might have
avoided
this!
and there are
three
different
fixes—
emergency, interim,
and permanent—for the
hemtt -a4 hoses…
instructions for moving
the hoses away from the
starter wire can be
found on:
commodity/soum/tacom_
wn/HEMTT-Rework.ppt
691.12-13.indd
1-2
5/3/10
2:14:21 PM
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