PS Magazine - TB 43-PS-633
PS, The Preventative Maintenance Monthly
ISSUE 633
AUGUST 2005
Problem
The HEMTT shutoff solenoid is constantly under vibration causing the nut to
back off the threads or completely come off, forcing the shutoff not to work.
Recommended Solution
Double nut the engine shutoff solenoid actuation stud to the lever to prevent it
from vibrating loose.
PS 633
59
PS 633
AUG 05
58
Evaluation
The design of this bracket and stud arrangement is already of the double nut fash-
ion and should not vibrate loose when properly installed and torqued.
An engineer evaluated the hardness of the solenoid stud, bracket attaching nuts,
and washers and found them to be correct. The bracket when properly installed with
one nut and one washer on each side of the bracket as shown in the exploded view
in the TM will provide the desired jam nut effect to prevent the nuts from working
loose due to vibration. Check the exploded view of figure 47 in TM 9-2320-279-24P
(see page 58) to be sure the bracket is installed on the solenoid stud with a nut and
washer on each side of the bracket to produce the jam nut effect.
Make sure that the nuts and washers are the ones listed in the repair parts manu-
al. It is possible that uninformed personnel may have replaced nuts and washers with
inferior pieces.
Once the bracket is adjusted to the correct position for engine shut-off, torque
the jam nuts against each other to 6 lb-ft as shown in Appendix E, Table E-1, for a
grade-2 dry fastener
1
⁄
4
-in by 28 threads per inch.
If the problem persists, loosen the nuts and apply a small amount of thread lock-
ing compound to the threads and re-torque. Note that the adhesive thread locking
compound listed in the TM is obsolete. You will need to order sealing compound
with NSN 8030-01-104-5392. The NSN gets you a box with ten 10cc bottles. This
should solve the problem and the nuts can be easily loosened at a later time if anoth-
er adjustment is necessary.
Submit Your SMART Ideas!
To submit your ideas, use the AEPS website at:
More info is available at the website or by calling (804) 734-0485/0595 or
e-mailing:
SMART@lee.army.mil
SMART Ideas Are Money Makers
The good ideas
of mechanics
can reduce
work and save
the Army money.
A recent example
is a fabricated
tool for safely
replacing final
drive sprockets
on M1-series tanks.
Two soldiers earned $2,000
when they fitted an overhead
crane with a metal plate that
attaches to the final drive
sprocket.
The crane bears the
weight of the sprocket, saving
soldier’s backs and making
replacement
safer, easier
and faster.
Approved
Suggestion
Modification of PMCS for
HEMTT rear wheel assembly removal
Fabricated tool for safer removal &
replacement of final drive sprocket &
hub on M1-series
Provide better material protection for
the PLS hydraulic filter cover & housing base
Include torque converter adjustment
procedure in TM 9-2320-280-20-2
$2,000
Name/
Location
MSG Denver Meyers,
Ft Wainwright, AK
SSG Christopher Sobkowiak,
Mannheim, Germany
1SG Thomas Eckerson,
Helena, MT
SFC Eric Wade
SGT Donnie Parker,
Ft Polk, LA
CW2 Danny Taylor,
Schofield Barracks, HI
Gary Ward,
Taegu, Korea
Recommended
Award
$250
$2,685
$700
$500
$250
Relocation of HEMTT harness bracket
Blade lifting tool for helicopters
Some ideas earn
cash awards.
633.58-59(C).qxd
7/2/05
11:42 AM
Page 1
AUG 05
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