Yanmar ViO12-2A, Руководство по обслуживанию

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6.
HYDRAULIC SYSTEM
6-7-2
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Malfunction Probable case Additional checks Remedy
No machine movement (for
hydraulic signal receivers
only)
(1) Leak See <Visual defects>
(2) Control valve seized or
blocked
Replace pilot unit
Lack of speed of one or sev-
eral machine movement(s)(for
hydraulic signal receivers
only)
(1) Poor pressure signal Replace pilot unit
(2) Leak See <Visual defects>
No machine movement (for
electric signal receivers only)
(1) Electric function failure Replace handle
(2) Handle poorly connect Check the connection
Malfunction Probable case Additional checks Remedy
Handle does not automati-
cally return to neutral posi-
tion:
(1) Manual return with fric-
tion
(1) Faulty cardan Replace cardan
Handle does not automati-
cally return to neutral posi-
tion:
(2) Manual return without
friction
(1) Lip seal too hard inside
guide
Replace plungers
(2) Regulation unit setting
spring broken
Remove the regulation unit
for visual inspection
Replace pilot control unit
(3) Regulation unit plater
broken
Handle turns (1) Handle parts loose Tighten all handle parts
Malfunction Probable case Additional checks Remedy
Rubber boot damaged Replace boot
Leak on arm rest originating
from under the boot
Leak between guide and
push buttons
Lift the boot to perform a
visual inspection
Replace plungers
Seepage on body Porous body Replace the pilot unit