PS Magazine - TB 43-PS-707
PS, The Preventative Maintenance Monthly
ISSUE 707
OCTOBER 2011
12
PS 707
OCT 11
13
OCT 11
Y
ou want your equipment to work, but that doesn’t always happen. And if you’ve tried
load testing a crane on your HEMTT -A4, you might have experienced this!
Troops have found that load testing a crane on a HEMTT -A4 leads to the suspension air
bags inflating and raising the load. This makes it impossible to measure the drift of the load
during the test.
Avoid this problem by following these
updated load test procedures that will be
added to your HEMTT -A4 IETM, EM 0288:
When you set up the crane, under the
“Prepare Crane For Operation” section of the
IETM, make sure you dump the suspension
air before setting up the outriggers. Go to
the “Operator” section of the IETM and find
the procedure to “Operate Air Suspension
Dump Valve.” Follow those instructions.
Once you’ve finished operating or load
testing the crane, inflate the suspension after
stowing the outriggers.
That means the SPNSN AIR LOW indicator
light, located to the right of the speedometer
and above the transmission oil temperature
gauge, should be OFF before you move the
HEMTT. This is important because if you
operate the HEMTT without the suspension
inflated, you could damage the truck.
T
he STE-ICE wiring harness on new and rebuilt PLS engines is getting a raw deal.
That’s because the harness can rub against the rotating back plate of the engine’s
200-amp generator.
Enough rubbing wears away the insulation and exposes the wiring. That causes an
electrical short in the vehicle’s diagnostic system. A short means no STE-ICE!
Use a high-temperature tie-wrap, NSN 5975-01-577-
6742, and secure the wiring harness onto the engine’s
oil dipstick tube. That way the wiring harness stays clear
of the generator’s back plate. And that’s all it takes to
snub out the rub.
Snub the Rub
HEMTT -A4s…
Deflate Suspension
Before
Load Testing
M1074P1/M1075P1 PLS…
Snub the Rub
Follow IETM instructions for operating
air suspension dump valve
Secure wiring
harness with
zip tie or clamp
to engine oil
dipstick tube
so
here’s
the
quick
fix…
Hey…
what
happened to
my STE-ICE? it
was working a
moment ago!
But sergeant!
you
TOLD
us to
load test a crane
on a HEMTT -A4.
707 12-13.indd
1-2
8/26/11
3:13 PM
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