PS Magazine - SEPTEMBER 1978
PS, The Preventative Maintenance Monthly
ISSUE 310
SEPTEMBER 1978
M746 221 /2-ton HET TractOR .
..
Overspeeding is kilLing a Lot of dieseL engines in those M7 46 heavy
equipmenT Transporter (HE±) tractors.
If engine speed goes much over 2, 700
RPM,
The valves begin to FoaT
- maybe even kiss the p²sTon - and there goes anoTher eNgine.
MosT overspeediNg comes on DowNhiLl TraveL.
You'd betTer know how To conTrol your downhiLl speeD be³re you get To
The top of a LoNg, sTeep grAde.
Get ouT your TrusTy operaTor´s manual µ±M 9¶2320·258¸10 (¹pr 76º,
para 2·4 µ»nD ¼Nd ouT ½ow To conTroL The beasT.
STarT DowN The ¾hill iN The sa¿e
gear as wheN you ToppeD ²T.
WATcÀ The TachomeTer. STarT
usiNg The reTArDer wheN The
eNÁ²Ne reAches 2,200¶2,250 RPM.
Âhe reTArDer worKs oNly as loNÁ
as you press DoÃN oN The sw²Tch.
Äeep aN eyeball oN The TrANsÅ
m²ss²oN TemperaTure l²ÁhTÆ IT'll
come oN aT abouT 225°Ç. Èow
ÃaTcÉ The TrANsm²ssion TemperAÊ
Ture ÁaÁe. IË The TeÌp goes oN uÍ
To 250°Î leT oÏ oÐ The reTarDerÆ
You DoN'T waNT The TraNÑm²ss²oN
o²l To geT Too hoTÒ
STAy wiTh the reTarder Ó unÅ
Ôess The TransmissioN o²l gets hot
- Till you get The engine speeD
uNDer conTrol. WATch The TAch,
Tho. IË ÕT Áoes up To 2,300
RPM,
sTarT ËeATher²nÁ The Trailer brAke
Val e. ±o ËÖATher, you hiT The
BrAKe l²ghTly, oN¶oÏ, on·×Ï, sevÅ
eral T²mes. You Do This eNouÁh To
Apply The bØAKes buT noT enough
To make The T²res sÔ²De.
IË you're sTÙll pickiNg up speed,
Keep your cool anD sTay in conÅ
Trol. WATch The TAch. IË iT gets To
·
2,400
RPM,
you´ve goTTa slow 'er
DoÃN!
GeT oN The TreADle braKe peDal.
PusÉ TÚe peDAl DowN eAsy. Ûo
ÑÔÜÌ̲NÁ oN TÉe braKes - your
ÃÉÝÝÔÑ Ã²ÔÔ locK!
ÞÝÔÝÜÑe ThÝ reTArDer AND
TßA²Ôer brAKÝ VAlVe whÝN you use
TÉe àoT BrÜKÝÑ.
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