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Reading HydraulicSchematics

Lecture 9


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Purpose of Hydraulic

SchematicsSchematics are drawings that youcan use to see how a system is put

togetherSchematics can be used to locatewhere a component is located

Useful for troubleshooting


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Pumps

Uses a circle with anarrow pointing out

Denotes xeddisplacement

ariable displacement

has a diagonal linegoing through it


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!otors

Similar to a pump"except the arrow is

pointing in#f it has $ arrows" it isbidirectional

% diagonal arrowmeans it is &ariabledisplacement


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Pressure Relief al&es

'he dashed lineindicates internal

passages(an ha&e a spring"or can be pressureoperated )se*uence&al&e+

Pilot operated canbe mar,ed with a P


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(ontrol al&es

(an be tandem )allows-ow to tan, when closed

(an be closed center

)allows no -ow in thesystem+


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(ontrol al&es

(an be open center )allows -ow onboth sides of the &al&e+

. way &al&es control double acting

cylinders/ way &al&es control single actingcylinders


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0ilters and (oolers

0ilters are shown by a diagonal boxwith a dotted line through it

1il (oolers are similar except that

the line is solid


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2auges

1il temperature gauges

1il pressure gauges


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Hydraulic (hec, al&es

(an use a ball and seat or a springbehind the ball


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Hydrostatic 'ransmissions

Usually a &ariable pump and amotor coupled together

(an use a &ariable motor also


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1ther Symbols

1ther symbols are used by certainmanufacturers

Usually mar,ed or ha&e a legenddescribing part

!ost schematics do not place partswhere they actually are on themachine

!ust use other manuals to locate parts


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3ebsites and Resources

http455www6hydraulicsupermar,et6com

http455www6par,er6comic,ers !obile Hydraulics !anual

Par,er #ndustrial Hydraulics
http://www.hydraulicsupermarket.com/http://www.hydraulicsupermarket.com/http://www.parker.com/http://www.parker.com/http://www.hydraulicsupermarket.com/http://www.hydraulicsupermarket.com/

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