PS Magazine - TB 43-PS-737
PS, The Preventative Maintenance Monthly
ISSUE 737
APRIL 2014
20
PS 737
APR 14
21
PS 737
APR 14
O
perators, loss of engine power will bring your road grader to a screeching halt. A
lot of the time, the cause is a turbocharger coupling leak.
If
the
coupling
is
loose,
misaligned, or its seal rings are
missing or damaged, your grader
will lose some turbo boost and may
seem sluggish.
So eyeball the coupling for a bad
connection to the mufFer. Check
for signs of leakage, such as carbon
stains. Then look at the seal ring
to see if it’s missing, cracked, split
or torn.
If you ±nd any of these problems,
tell your mechanic. He’ll loosen
the mufFer-to-turbo connection and
align the mufFer with the coupling.
While he does that, he can check out the seal rings. If they’re damaged, he’ll
replace them, including the packing and gaskets.
Once everything’s OK, he’ll tighten the connection and you’re back in business.
T
he H100C 5-yd scoop loader has seen many years of Army service in locations all over the
world. Since it was fielded in the 1970s, a lot of parts have been replaced—not always with
the original components.
Alternators lead the list. Here are two of the most commonly used replacement alternators:
Old Style Alternator
The “old-style” 50-amp alternator, NSN 2920-00-231-7270, is the typical one used for many
years. It’s the original alternator that came with the H100C and has a long case.
New Style Alternator
The “new-style” 70-amp alternator, NSN 6115-01-440-7397, is the replacement used on
many H100Cs the last few years. It’s the one typically installed on loaders that have been up-
armored for use in SWA and has a short case.
Before ordering a replacement alternator, check the defective alternator’s data tag
first. While the two alternators listed above are the most common, other models and styles
may have been used as a result of field replacements. Those are also OK to use if you can
find a replacement.
Cl
un
k
Fix That Sneaky Coupling Leak
H100C Scoop Loader…
Pick Between
the
Old
and
New
Look for misaligned coupling.
..
…missing seal rings, or signs of damage
I don’t get it!
What HapPened
To yOur power?
I think I’ve
got a leak in my
turbocharger
coupling!
what
the—!?
Old
style
alternator has
a long case
New
style
alternator has
a short case
You need a new
alternator, but
I’m not sure
what to order.
well, I
haven’t
been
up-armored,
so you’d
better get
the
old
style
alternator.
130G
Road
Grader…
Cl
un
k
737 20-21.indd
1-2
2/24/14
5:25 PM
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