PS Magazine - TB 43-PS-574
PS, The Preventative Maintenance Monthly
ISSUE 574
SEPTEMBER 2000
PS 574
7
SEP 00
PS 574
6
echanics, a throttle that sticks open
can ruin a driver’s day—or his
life
.
But it can happen when a driver
pushes the accelerator pedal to the
metal. The end of the hand throttle
cable hangs up on the accelerator link
stud. Then the engine won’t idle down.
It has to be stopped with the emer-
gency engine stop control.
Here’s how you mechanics can keep
the linkage from sticking:
1.
Remove the screw, nut and clamp
that secures the end of the throttle cable
to the bracket. Discard the screw and
nut.
M939/A1/A2-Series Trucks . . .
2.
Remove the screw that fastens the
bracket to the firewall. Discard the
bracket. The screw also holds a wiring
harness clamp and a ground strap lug.
3.
Use the screw that held the bracket
to fasten the throttle clamp, the wiring
harness clamp and the ground strap lug
to the firewall.
4.
Finish the job with a cap nut, NSN
5310-01-057-5518. Screw it on the
throttle link stud of the accelerator bell
crank. This nut will keep the end of
the throttle from catching on the stud.
small device that lets you load-test 12-volt
batteries in less than 30 seconds without opening
a single cell is now available in the supply system.
NSN 6130-01-463-8499 gets a tester that is
easier, safer and faster to use, and with more
accurate results, than the standard optical sight
glass or hand-held load tester.
Batteries don’t need to be disconnected from
the vehicle to perform the test, but the engine
must not be running.
Use the 12-volt device to test each battery this way:
1.
Place the tester’s positive post against the battery’s positive terminal.
2.
Slide the negative probe out of the tester’s storage slot and place it against the
negative battery terminal.
3.
One of four LEDs on the front of the tester will light. Each light represents a
letter code describing the battery’s condition:
A
—Good battery. Do not replace. Will start the vehicle.
B
—Low battery. Slave start the vehicle and let the battery charge, then retest.
C
—Discharged battery. Turn in for more testing and service.
D
—Bad battery. Turn in to battery shop for analysis and final action.
Lead-Acid Batteries . . .
Remove clamp from bracket
Remove bracket from firewall
MBT-1 battery tester
this
little
guy
can be a
big help
!
don't
let
a stuck throttle
ruin
your day!
Secure clamp
to firewall
Add nut to bolt
PS 574
7
SEP 00
PS 574
6
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