Yanmar ViO12-2A, Service Manual

Page: 218 / 409

6. HYDRAULIC
SYSTEM
6-7-7
*XLGH3OXQJHUDQG5HJXODWLRQ8QLW5HSODFHPHQW
Procedure
3UHOLPLQDU\RSHUDWLRQV
Remove the pilot control unit from the machine's arm rest.
Remove the handle.
Remove the cardan.
1RWH
,W LV UHFRPPHQGHG WR UHPRYH WKH SLORW FRQWURO XQLW IURP WKH
PDFKLQH1HYHUWKHOHVVWKHVHUYLFLQJRQPDFKLQHLVSRVVLEOH
E\VHFXULQJWKHXQLWLQWRDYLFHJULSZUHQFKRSHQLQJ7KLV
LVSHUIRUPHGE\H[WUDFWLQJWKHERG\IURPWKHDUPUHVWVRDVWR
FODPS WKH YLFHJULS ZUHQFK RQWR WKH ERG\ LQ RUGHU WR KROG LW
DERYHWKHDUPUHVW
5HPRYDO
Secure the pilot control unit to a vice.
Remove the retaining plate.
Reassembly : Line up the notches for the grommet in both the
plate and the body.
Insert the end of a thin screwdriver between the guide and the
body, carefully lift the guide to remove it from the body.
1RWH
+ROGWKHJXLGHZLWKWKHRWKHUKDQGGXULQJWKHH[WUDFWLRQRSHU
DWLRQWROLPLWWKHHIIHFWRIWKHUHWXUQVSULQJ
Remove the guide / plunger assembly.
Repeat the operation for the other 3 sub-assemblies.
Reassembly : Use the retaining plate to insert the 4 guides
into the body simultaneously and perpendicularly.
Reassemble in reverse order.
5HJXODWLRQXQLWYHULILFDWLRQ
Extract the regulation units from the body (using flat nose pli-
ers).
Visually check that the guides / plungers are in good condi-
tion. If defects are present, replace the 4 sub-assemblies.
Inspect the regulation units and particularly their spring. If
defects are detected, replace the 4 units.