8/18/2019 Afr 1041 (Hydraulic & Pneumatic) Handout #1

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UNIVERSITI KUALA LUMPUR

MALAYSIAN INSTITUTE OF AVIATION TECHNOLOGY 

TYPES VEGETABLE BASE MINERAL BASE SYNTHETIC HYDROCARBON  

BASE 

PHOSPHATE ESTER BASE 

MILITARY 

SPECIFICATIONS•

MIL-H-7644• DTD 900/4081

•MIL-H-5606

• DTD 585

•MIL-H-83282

• MIL-H-81019

•MIL-H-8446

MIXTURE/BASE • Castor oil and alcohol   • !"ros"n"-t#$" $"trol"%& $rod%ct   • '#nth"tic h#drocar(on   • )hos$hat" "st"r/s#nth"tic

COLOR

IDENTIFICATION • *l%" or +old"n #"llo, color   • "d color   • "d color   • Li+ht $%r$l" color

SEALS & HOSES

• .at%ral r%(("r   • ."o$r"n"

• '#nth"tic r%(("r

• L"ath"r or &"tal co&$osition

o$tional

• ."o$r"n"

• '#nth"tic r%(("r

• L"ath"r or &"tal co&$osition

o$tional

• *%t#l

• '#nth"tic r%(("r

• th#l"n" $ro$#l"n" t"lon or

l%orocar(on r"sin

FLUSHING

SOLVENT • lcohol   • .a$htha

• arsol or 'toddard sol"nt

• .a$htha

• arsol or 'toddard sol"nt

• Trichloro"th#l"n"

 ADVANTAGES

• .on"   • ood l%(ricatin+ $ro$"rti"s

• dditi"s to inhi(its oa&in+ and at th"

sa&" ti&" $r""nt th" or&ation ocorrosion

• Incr"as"d ir" r"sistanc" co&$ar"d to

"+"ta(l"s h#dra%lic l%id

• )oss"ssin+ th" sa&" adanta+"s

as &in"ral (as"

• ir" r"sistant

• s"d in ":tr"&"l# lo,

t"&$"rat%r" and o$"rational at at"&$"rat%r" as lo, as -90o

• ;id" ran+" o o$"ratin+

t"&$"rat%r" ro& a$$ro:i&at"l#-65o to &or" than 225o

• ir" r"sistant

DISADVANTAGES

• MIL-H-7644 is a la&&a(l" l%id

•Its stri$s $aint and attac< s#nth"ticr%(("r

• It also to:ic in a in" s$ra#s &ist

• la&&a(l" t#$" o h#dra%lic l%id   • .on"   • 'li+htl# h"ai"r than ,at"r

•"r# s%sc"$ti(l" to conta&ination ,at"r("ca%s" it a(sor(s &oist%r" ro&at&os$h"r" and &%st ("