PS Magazine - TB 43-PS-572

PS, The Preventative Maintenance Monthly

ISSUE 572

JULY 2000
PS Magazine - TB 43-PS-572 - Page 11 of 35
M109A4/A5 SP Howitzers, M992-Series Ammo Carriers . . .
Stop Starter Shutdown
M
echanics, have drivers been writing up their M109A4/A5 howitzers and
M992-series carriers because the starters keep locking up? The source of the
problem may be the starter protection relay.
When the howitzers were converted from -A2s and -A3s, the starter relay was
replaced with the same starter protection relay used in M992-series carriers.
Problem is, that protection relay can short out during start-up, causing the starter
to shut down prematurely. It may look like the starter has locked up when
actually it’s getting no power.
So before you troubleshoot or replace the starter, activate the combat over-
ride switch and engage the starter. If
the engine cranks, the problem is the
protection relay.
Get a new starter protection relay
with NSN 5945-01-291-0734. That re-
lay has been improved with a special
internal filter that eliminates premature
shutdown.
eed to move some palletized ammo? No problem—as long as you’ve got
the right equipment on hand. You’ve got a choice of the six-legged sling, the
single hoisting beam, or the double hoisting beam.
All three are authorized by TM 9-1300-251-20&P and can be used with any
capable lifting equipment currently used by the Army including the M977
HEMTT, 7.5-ton rough terrain (RT) crane and 40-ton RT container crane.
Here’s how they’re used:
Six-legged sling: Handles
one to three pallets of 155mm
projectiles and one or two pal-
lets of 8-in projectiles. It’s used
with the HEMTT crane and 7.5-
ton RT crane.
Ammo Handling . . .
Single hoisting beam:
Handles six pallets of 155mm
and four pallets of 8-in projec-
tiles. It requires two six-legged
slings. Used with the 7.5-ton RT
crane or larger lifting device.
â– 
â– 
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PS 572
19
JUL 00
using the
right equipment
will keep your
posterior out
of a sling.
18
PS 572
JUL 00
Double hoisting beam:
Handles 12 pallets of 155mm
and eight pallets of 8-in projec-
tiles in a single lift. It also re-
quires four 6-legged slings. Used
with the 40-ton RT container
crane. Can also be used as a
single beam sling with the same
capacity as the single beam.
Six-legged sling,
Single hoisting beam,
Double hoisting beam,
Use starter protection relay
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