Vermes MDS 3200A - Tappet Maintenance and Replacement

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VTK‐VS‐BA‐004e‐B|UserManualMDS3200A | Maintenance

9.3 MaintenanceoftheTappet

Asthetappetbelongstothewearingpartsofthesystem,ithastobegreasedandex‐

changedinregularintervalsorinthecaseofproblems(assoonasitstartstomoveina

sluggishway).Theexchangeproceduredependsontheparticulartappetmodel;ceramics

(two

versions,CTandCTF)andtungstencarbide(TTF)itemsareavailable.



CAUTION!(properlytrainedpersonnel)

Toavoidmajordamages,theseprocedureshavetobecarriedoutbypersonnelwithproper

training.



CAUTION!(usetoolMDT310)

Fordismantlingandinstallation,thetappetchangingtoolMDT310isrequired(seepage

9).

9.3.1 TheCT‐tappet(ceramicstappet)



9.3.1.1 Demounting

Step1: Carefullyremovethenozzleunitfromthefluidbox.(1)

Step2: BothM2.5hexagonscrewsofthefluidboxmustbeloosenedandun‐

screwed.Slowlyslideawaythefluidboxfromthetappet.Thefluidbox

mustnotbejammed;otherwisethetappetmaybreakoff!(2)

Step3: Tounscrewthetappetitself,proceedasfollows:

 Tool

MDT310featuresareceptacleboringforthetappet.Thisboringhasto

bepushedcarefullyoverthetappet,untilthestudsofthetoollatchinthecor‐

respondingrecessofthetappetcenteringscrew(3).

 Inordertodisengagethetappet,rotatethetoolcounterclockwise,witha

slightconstantpressure(4).

 Separatethetoolfromthetappet.Thetappetcannowberemovedthrough

thecaseboringofthevalve(5).

9.3.1.2 Installation

Tore‐installatappet,performthesequencedescribedaboveinreversedorder.

Aftercompletion,donotforgettoexecutetheadjust.

9.3.1.3 Disassembly

andCleaning

Step1: Inordertotakeapartthetappet,firstdisengage,slightlyrotating,the

centeringscrewfromtherod.Refertotheillustrationofthepartsabove.

Step2: TheinnerO‐ringsofthecenteringscrewhavetobedrawnoffbymeans

oftweezers.

Step3:

Theactuatorseathastobeseparatedfromthetappetrod(bothitems

illustratedabove).

Step4: Pulloffthespringfromtherod.

Step5: Allofthecomponentsmayhavetobecleanedinanultrasonicbath(not

theO‐rings!).TocleantheO‐rings,carefullywipe

themwithacloth.Po‐

rousringshavetobereplaced(order.no:1012275).

 

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Vermes MDS 3200A - Tappet Maintenance and Replacement

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