New Holland Workmaster 50, Service Manual

Page: 417 / 1067

Hydraulic systems - Main lift system
Main lift system - Adjust
In case of complete disassembly of the lift it is neces-
sary to make the following adjustments:
A. Control valve sensitivity setting
B. Position control lever setting
C. Draft control lever setting
D. Reaction spring setting
E. Internal push rod setting
A. Position control lever setting
With reference to 1 .
The adjustment is carried out in order to establish the
maximum raised position of the rockshaft’s lifting arms.
Completely lower the arms and apply a light weight
which creates a pressure in the cylinder of
50 - 60 bar
( 725 - 870 psi ).
Loosen the fastening screw (6) so as to free the position
control lever (1) from the shaft (5) .
With the draft control lever (2) at its lowest position
against the backstop (E) raise the position control lever
(1) against the backstop (F) .
Maintaining fixed the levers (1) and (2) and with a
13.0 mm ( 0.5 in ) open end wrench rotate slowly in an
anti-clockwise direction the position control shaft (5) so
as to raise the arms to their maximum raised position
which is determined by the internal hydraulic limit stop.
Since during the functioning of the position control the
hydraulic limit stop must not be triggered it is neces-
sary to have a safety margin of ~
10.0 - 15.0 mm ( 0.4 -
0.6 in ).
In order to do this, rotate slowly in a clockwise direction
the shaft
(5) until the arms are lowered by the required
safety margin.
At this point keep the shaft (5) fixed and with lever (1)
against the backstop (F) keep the lever fixed with the
shaft by tightening fully the fastening screw (6) .
To control, raise completely the arms by moving the po-
sition control lever
(1) against the backstop (F) raising
completely the draft control lever (2) there is a further
movement upwards of the rockshaft arms. This move-
ment should be contained within
15.0 - 20.0 mm ( 0.6 -
0.8 in ).
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