Hydraulic Lift; Hydraulic Pump; Pump General Overhaul - Fiat 411 R Service Manual

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Fig. 17%. - Hydraulic pump mounted on fractal'. Fig. 172. - Hydrauiic iifi mounted on tractor.
A. Lift control lever - B. Seleclion lever (position coairoi
requires the lever lo be shifted down) - M. Spring for reaction
strut.
Hereafter are the main components of the lift mounted on 411 R tractors:
~»~ a gear hydraulic pump, driven by engine timing gears (Fig, 171];
— a iii-t, with integral' oil tank composed oi a ram (simple efieci) acting through a ball-heeded linl-: on a
lever keyed on the lifting arm shaft;
— a three point implement hitch, adjustable with a screw controlled by a hand wheel on the right link,
allowing the cross adjustment of the implement position (Fig. 127);
—~ a control valve, optional, to be applied in place of the control valve cover for supplementary attachment
control (Fig. 193).
HYDRAULIC PUMP '%cé/ fig'? 7%"/"~
The hydraulic pump needs no maintenance, checking or adjustment even eiter long operation. This is
Q, or ' , .
ue to the factrlhal clearance between "me gears and bushes [S taken up automatically by the oil pres-
sure in the pressure side.
The bushes have their side facing the delivery fitted with a fillet (1, Fig 1'53), which the oil crosses tr ro h
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to act upon a surface recessed on the two covers and defined by two rubber gaskets shaped as a
heart, and laid eccentrically (2).
Pump general overhaul.
See Fig. 173 r'or the disassembling and assembling sequence of the hydraulic pump components. The
explanations of the preceding paragraph should facilitate a correct assembly and disassembling; sense
of rotation oi the drive shaft is indicated on the pump cover.
in addition, notice that assembly and disassembly require no special tooling, as the high finish of
h.
mac med surfaces would be damaged by a careless assembly.
Never disassemble a hydraulic pump if original spare parts are not available: if repairs are necessary
entrust them to FJAT Service Organization.
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