PS Magazine - AUGUST 1978
PS, The Preventative Maintenance Monthly
ISSUE 309
AUGUST 1978
)±.
Dear EditoR
We had several cases of er±atic boom operation when we used the
craNes Of oU± M816 5-toN wreckers ²becAuse the w±ecke±s were being
operated at 1,400 to 1³500 ´PM's.
TM 9µ2320¶260¶10 (·ov
77
)
says engine speed F± c±ane operation
shoUld be clos¸ to 1³250¹
We reset the mechanical variable speed (MVS) goveºor to 1³250
´»M. The crane boom ¼orked smoothLY The adjustment can be ma½e
iN aBout 15 minutes by the Unit mechaNic
¾
Here¿s how we did it:
.
±²³-´µ,¶·¸
Àirst, check the condition of the
liNkage betweeN the operator¿s coÁÂ
trol leve± and the governoà ² no
bends³ breaks or binding.
Äext³ measUre the linkage at the
MVS goveºoÅ Æ haǶinch oÈ threads
shoUldÉshow oN the piston rod at the
Ê
Ë
aIr cyÌNder bracket.
Piston traÍel shoUld bÎ 1-3
Ï
8 inch.
I
it's
OK¹
theN only the th±ottle lever
and the stÐkÎ bolt on the back side of the
MVS need adjustment.
MYS governor is on the
rear eNd of the fuel pumpº
down at tHe left side of
tHe engine
(Ed note - The head shed liked the
idea, too. The work can be done by
youRmech.±
7
Ñoosen the lock bolt at the
bottom of the throttle leve±.
Move
the
leveÒ
clockwise
towa±d the aÓ± cyÌnder 1 or 2
notches on the throttle shafÔÕ
Secu±e
tÖe
bolt
.
Start the
engine, engage the c±ane conÂ
trols and set the throttle at fu×
´PM
Õ
Check the tachometer fo±
1³250 ´PMØ.
MiNor adjustment with the
strike bolt at the top of the
throttle lever can increase o±
dec±ease ´PMØ by
±
50 ´PÙ
CW2
J²
White
ÆMSÆ4
Äewbu±gh, ÄÚ
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