Inspection Of Components Disassembled From The Hydraulic Lift - Fiat 411 R Service Manual

Arms control shalt.
Control valve (Fig. W3).
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Fig. 182. - Lifl outside and inside control linkage.
(The illustration shows: on 'lop, the outer leverage removed
from fhelift; belov.',%l1e insldeieverage placed as during work).
A. Lift control lever - B. Selector lever - 1.. Leverage control
lever - P. Control spool - Q. Screw securing the control lever
to the spool - R. Screw securing the lever L to the rocker.
Remove the rrrr oufer arms; the screws which fasign
{he levers to the inner arm (21, Fig. 1??) and slide
the shaft in the direction shown by the arrow/.,
Noie. - To prevent damaging the seal ring
located on the /eff end of the arms control shaft,
more the shafi about 2 cm (25/32"} in the sense
oppos/Ye io the arrow and remove the ring (Fig, 177)_
The inner arm wifh its pision n'rl'w'ng strut remains
inside the power lift. -
Fl'e-moi/e pin (0) which fixes {he waive spoof control
lever fo his link prior to sliding {he whole unit ofi'
the studs.
Nofe. - The for/owing components rerpafn free
inside {he power /ffi:
»~ the lever mechanism which is removed by un-
screwing ihe screw (R) first and sliding ofi the
outer fever (L) in a second time;
-- fhe pfsfon and barrel. The fatter can be slid oui
the front by applying a slight force.
The vah/es can ah' he disassembled easily enough as
they all are accessible from the outside, l-vfih the
exceptfon of the off inlet into the power cyfinder
valve (5) which requires removing the control valve
group. To disassemble the confrol' valve slecken the
screw which fixes the control lever (Q), remove {he
adjusting plug (t) and the side cover of ihe conirol
valve for auxiliary equipment (Fig. 180).
Fig. 183 shows the power lh'{ suhassemhlies in the
dismantling sequence and Fig. 182 the outside lever
mechanism (above), and {he inside lea/er mechanism
connected as they are during operation (be/ow).
lnspeciion of components disassembled from 'the hydraulic lift.
After dismantling the power lift unit check the following:
— check conditions of the gasket between barrel and housing and between piston and barrel;
-— check the play between the arm control shafi journals and the bushings; if found exceeding the values
specified on the table of page 130 replace ihe bushings;
~—- check that the play between the control valve spool and its bore lies within the specified Eimlls.
Note that the valve spool is not furnished singly as a spare, but always Together with the valve block
being fitted to the bore;
wash 8%'; replace the oil filter cartricigelli found defectlve)ancl make sure that the filter seat plug is well
welded lo the plate for carfridge protection to prevent aifsuction on the part of the hydraulic pump;
replace the oil seals for the lift arms shaft and the gaskets of covers, plugs and valve seats if they are
not dependable;
check sealing characteristics of the discharge valve and of the lift control valve (4, 2, Fig. 185}, grind
the seats if necessary and check spring performance;
check the selling of the pressure limiting and safety valves by means of a hand pump equipped with
valve carrier A 197032;'A,/B, Fig. 181. lf data do not correspond, replace the valves. as component
oarts are not furnished separately as spares.
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