( 3 ) Disassemble the special tool
(MD998442) and check whether the
plunger could be pressed. If it is not
easy to press the plunger, the
hydraulic erect post is normal. If it is
easy to press the plunger to the end,
the hydraulic erect post should be
exhausted again and then be
checked again. If the plunger is still
loose, the hydraulic erect post should
be replaced.
Caution:
·After the exhaust of air, the
hydraulic erect post should be
kept erect to avoid outflow of the
internal diesel oil.
( 4 ) After the exhaust, the hydraulic erect
post should be installed in special tool
(return leakage tester).
(5)When the plunger sinks a little(0.2~
0.5mm), measure the time it needs to
sink a second 1mm. If the
measurement value is not conformed to
the standard value, replace the
hydraulic erect post.
Standard value: 4
~20seconds/1mm
(applying diesel oil of 15
~20 )
℃
hydraulic
erect post
MD99844
0
graduation=
1mm