PS Magazine - APRIL 1986
PS, The Preventative Maintenance Monthly
ISSUE 401
APRIL 1986
Dump Trucks .
..
Dump truck hydraulic cylinders leak-some just a dab, others a bit
more.
Single ram cylinders seep just enougH to keep the rod coated with oil and
The seal weT. ±he oil protects the rod from The elemenTs and corrosion.
±elescoping hydraulic cylinders²like the hoist cylinders on M9 I 7 and
³
H
F5070 dump Trucks-have seals at each segment of the cylinder. Each
seal seeps a biT´ .µ to lube the seal and coaT the cylinder´ ±he seepage adds up,
Tho¶ to as much as a quart a day. But this type of leakage does noT make your
F5070 or M917 dump Truck NMC.
·f The hoist cylinder will raise the empty ¸ump body¹ your Truck's OK to
go.
Keep an eye on the level gage, thoº ³f you find it takes more»n a quarT a day
To refill the reservoir, you may have a real leak. GeT your mech to look things
over.
M939-SeRies TRucks ±.²
You mechanics get shortchange¸
when it comes to lubing instructions
for the front axle U¼joints on ½939¾
series 5¿ton trucks.
Note 7 of LO 9À2320À272Á12 tells
you To lÂbe Them, but doesn't tell you
how.
Begin by removing tÃe axle shaftÄ
following the insTructions iÅ Para 6À
13a of ÆM 9À2320À272À20À1Ç
PumÈ grease into the UÉjoint fitÊ
ting Ë slow and easy.
Ìe sÂre grease oozes oÂt of all four
seals.
Íut the axle back in an¸ reassemÎ
ble the steerÏng kÅuckle Ðike it says in
Para 6É13eÑ
±hen remove the front and rear
plugs, on the back of the steering
knuckle.
Pump grease in one hole
until it comes out the opposite one´
PU³´ gµEa¶E
hEµE ·ntIl
It Co³E¶
oUt thE
othEµ ¶IdE
Seeing's Believing
You say you put a new bulb in your mIcrofIche reader buT IT stIlL
won'T lIghT up?
BeFore you seNd the reader ±n for repaIr, make sure you²ve replaced
the bulb³s access cover.
MosT reaDers have aN Interlock sw±tch That keeps the bulb from
´IghTINg uNtI´ The cover is ±n placeµ ¶hat keeps dust aNd dIrt ouT of the
set· ¸T also preveNts a hot bulb from startINg a f±re¹
You close the switch by putt±Ng the cover back where It belongsº
APR 86
25
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