Working Diagrams Of The Hydraulic System For Different Arm Positions - Fiat 411 R Service Manual

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S. Arms lifrlng.
'i"l1e control spool P is ro_2a'l.ed so to let oil pass from {he pump onto the top cl the llft Eoniroi waive plunger 2. ensuring?) its closure. The preg-
Surized 0l| can thus llawm to the cyimder through valve 5 and dlsolace 'lhe piston to lnt the arms.
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F. Arms floating.
As soon as the oislon moves. the confrol spool F relates being conneclcd to lhe Inner arm through levers F, E, D. The spool rotallorlal mov-
ement causes tho cl! under pressure which kepi the valve 2 closed by pressing on lts top to discharge Into the reservoir through the grc-Que
machined along the spool axis. The pressure of the oil coming from the pump and aciing on the bottom of the valve wins 'lhe resistance. the
valve opens and the oil flow is conveyed into the reservoir Instead oi the cylinder.
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A. Arms Lowering.
To lovqer the arms, the valve spool opens by cam action the discharge valve (4), which allows the oil to outflow lowards ihe tang undgy the 9,93-
Mme or the plston.
Fig. 175. - Working diagrams of the hydraulic sysiem for different arm positions.
(Note: The oilfiow patrern in the circuit is ldenilcal both for position and draft control operation) -1. Pressure relief \'fillF9— 2. Control
gllvg - 3. Cylmder saretyyalve T Cylinder discharge valve - 5. Cylinder lnlakg valve - D. Link ~ E. Rocker - E Yoke link -
* °';*l'°{ 59°03 ' 9: ¢- F'WO'l l30|l'k5 Y Gfoove alongfhe control spool axzs for oll dzscharge when valve (2) opens - L. Linkage
conlro eler - U.V.Z. Top lmk rnountmg noles. (Srarhng from lrlt No. 27108 up the number of holes has been increased from
3 to 4. see Fig. W5).
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