PS Magazine - JUNE 1986
PS, The Preventative Maintenance Monthly
ISSUE 403
JUNE 1986
Truck Clutches .±²
There's
No
Free Ride
'OU CAN
RIDE
M 6cK
BT
not mY ±Lu²³H
!
Come on, drivers, keep your big foot off the clutch pedal-except when
y
o
u want to shift gears.
It's easy to ride the clutch pedal. It makes a good place to rest your foot
during a long run, or when you do a lot of cross±country driving²
But there are no free rides³ If you use your clutch pedal for a foot rest´
youµre going to wear out the clutch¶
Thatµs because when you rest your foot on the clutch pedal´ the clutch
begins to disengage. That starts the throwout bearing spinning. The bear·
ingµs not made to spin all the time´ tho´ and it canµt take it³ It fails. And your
truck goes to
dS
for repair³
Free ´ravel
ConstaNt use of the clutch grinds bits and pieces off the clutch lining³ This
lets the clutch pedal go down further before the clutch begins to disengage³
This "free¸ Pedal movement-thatµs the easy part when you first push down
oN the pedal-is called free travel³ And the free travel has to be just so or
your clutch wonµt work right³
Free travel
moves throwout
bearing ahead
to release lever
CoNtrol rod Needs
adjustiNg when
free travel is
too short. This
pulls reLease
TheN Levers
fork aNd bearing
back ±rom reLease
puLl back
Levers² Then there's
-
pressure
more free traveL
plate-and
1³´µ¶·¸¹º=»¼½¾¿
cLutch
diseNgages
38
Jµ¶· ¸¹
You neEd to ¹heck free travel oftenº Hereµs how :
ºe»hs:
Make an auto sight gage for drivers To check free
travel.
Measure up from the floor the maximum amount
allowed by the ±M 'n' Paint it white²
¼riv½rs:
³ress down the Pedal untiL you feel resistance´ If the
white Paint's out of sight, have your mechµ adjust The free
travel¶
Here's a List of c·utch Pedal fRee
travel measurements-and where
you'll find 'em in the ¸M's:
M151A2³/4-ton´1µato 1% incHes
P¶r¶ ·¸12f, Pg ·¸51, TM 9-2320-218¹
20-1-1; otHEr M151¸sEriEs º¸ton»
1µa to 1¼½ incHes, P¶r¶ 2¸·¾b, Pg 30,
¿5 to TM 9-2320-218-20²
M561 ÀM792 1Á¹ton (GÃm¶ Go¶t)
-%
to 1µa incHEs, P¶r¶ 3Ä3fÅ Pg 3¹15Æ
TM 9¹2320-2·2-20-3-1Ç
M··A 1
&
A2¸series 2ÈÉ-ton (mULtiÊ
fuEl)´1Ë to 2 incHes, P¶r¶ 3¸3E,
Jµ¶· ¸¹
.
Pg 3-15Æ TM 9¹2320-209-20-3¹1Ì
M··¸series 2¼½¹ton truck (¶ll otHÊ
ers)»1% inchEs to 2 incHes, PÃrÃ
150¶, Pg 261, TM 9¹2320¹209-20²
M39A2¸series 5¸ton (multifuel)´
2 to 2¼½ inches, P¶rà 3¹3¶, Pg 3¹2,
TM SÍ2320¹211¹20-3-1²
M39¸series 5¸ton (¶ll otHErs)´2
to 2¼½ incHes, P¶r¶ 2¸·9, Pg 2-80Æ
TM 9-2320-211¹20²
M809¹series 5¹ton´2 to 2ÎÉ inÊ
chEs, P¶r¶ 3¹6¶, Pg 3¸9, TM 9¹2320¹
260¹20-3¹1²
39
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