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3-CONTROLSANDINSTRUMENTS

AUXILIARYHYDRAULICS

Standardauxiliaryhydraulics

Followtheattachment’soperator’smanualonspecic

installationprocedures,operation,andremovalproce-

dures.

Auxiliaryhydrauliccouplersarelocatedontheleft-hand

loaderarm.

1.Workports—1/2inchcouplersize

2.Casedrain—3/8inchcouplersize

UsetheProportionalAuxiliary“rotary”switchontheright-

handcontrollevertooperatetheattachmentconnectedto

thestandardauxiliaryhydraulicsports.Seeyourcontrol

leverswitchcongurations3-23formoredetails.

631068391

Relievepressurebeforeconnectingattach-

menthoses

Machineswithauxiliaryhydraulicportsarebuiltwitha

Connect-Under-Pressure(CUP)valvefortheauxiliary

hydraulicquickdisconnects.Followthisprocedureto

relievethepressurepriortoconnectingthehydraulic

hosesfromtheattachment:

1.Usingthepalmofyourhandpushthe1/2inchfemale

quickdisconnectcouplingtowardCUPvalve.When

doneproperly,thecouplingwillmoveabout10.0mm

(0.4in),relievingthestoredpressure.

2.Performthesameactionforthe1/2inchmalequick

disconnectcoupling,relievingthestoredpressure.

6310683992

3-29

New Holland C238 User Manual

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