PS Magazine - JULY 1976
PS, The Preventative Maintenance Monthly
ISSUE 284
JULY 1976
Dear Half-
Mast,
.
.
1
.
II a lot of sem±tra± ers²
Our unit pu s
·
h
Wh t's the procedure f³r checking t e
\1
bra
:
es on these tra´lers?
±
1±\rK²
SP4 Jµ
M
²
±
1,i!\±²³j´µ
¶
Dear Specialist
J.M.P±,
Here's a good sequence for checking
those brakes:
·¸
Look at all visible parts of the
brake system. Check foR leaks, ±special-
ly around connections²
2¹
With the trailer brakes applied,
try to Move out with the tractor² All
trailer wheels should be locked²
3º
Now try a rolling brake test²
Bring the coMbination to a stop, and
have soMebody watch to see if any
wheels lock up before the others³
Finally, disconnect the airbrake
lines and try to Move with the tractor´
Again, all wheels should be locked.
After operating for a while check
the brµkes at a regular stop² Carefully
(they May be hot) feel the brake druMs
to see if any are warMer ¶n the others³
A hotter druM probably Means the
brakes are dragging·
HOW ABoUT thE C²NNec³I´nS?
µ
²
³
-
_
:±
.
_ ´ µ¶¸
¹
º»¼»
Just about every vehicle operator's Manual
(-10
T¸) ¹ells you tG
½
¾
BE
º»E¼T FO¼ UNUSUAL NOI½E½!
C
t
'
cK·?
f
FJ²³
;
(f:;±
'²
³´Fau.
Why?
´Tµ¶/¸¹º»¼½_¾0¿"À Á4,l-yÂÃÄSLAÅÆ
There're Many working and Moving parts
m
your
eng¾ne, chass¾s,
¿
power train, etc³, that screaM for help when soMething's wrong³ It's their
way of letÀing you know that trouble is brewing³ Áives you a chance to catch
failures before they happen³
»ER¼½¾¿ ÀÁÂÃ
ÄÅUNÆ CÇÈÉÊ TËAÌ
jGÍÎL ÏÇÐÑÒÓÔÕÖ
×Ø ÙÚÇÛBÜÝÞß
s´u¶D
Hssssssss
par·¸ i¹
Trouble
Thump-Thump
Air hose leak or a tire leak.
Broken spring, exhaust banging against the
frame (broken ±anger).
Clonk-Clonk
Chirp²Chirp
Snick³Snick
SquE-e´e-al
Whinµn¶n-e
·laPµ¸La¹
wºtle
Fºf»
Click-»lick²Click
FUf-¼
f´f²f¶f
Bad hocks or shock bushings ½orn
unIversal joints.
'
¾oose or ½orn V-belt or dry bearing¿
ÀlecÁrical shortÂloose or bare ½ire arÃing.
Worn brake shoeÂrivets cutting into drum.
Dry or ½orn gearsÂespecially differential
transfer or transmÄssÅonÆ
'
Flat tire on a dual ½heel or a badly cut tire¿
¾eak around intake manifoldÂvaÇuum leak.
¾ea
È
k around exhaust manifold or in exhaust
pIpeÉ Bad mufflerÉ
Ê
Bad inÁake or exËaust valve clearancesÌ
Overheted or leaking cooling sYsÁem ËoseÉ
Spe½Ing radiator caÍÎ
Ïoose cranksËafÁ or connecting rod bearinGsÉ
àá
Back to Top Back to Top
