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38
Chapter I1V—Hydraulic System
of 34 inch between the edge of the lever and the top end of the slot
in the quadrant as shown in fig. 29.
(5) Make sure that the control arm moves freely and is held in a
horizontal position by its own weight as shown in fig. 29. Loosen
the position control lock nut, and adjust the length of the position
control
spring by turning the position
control
spring adjustment
bolt (fig. 30). Adjust the position control spring length until the
position control pin contacts the cam, and the position control spring
adjustment bolt contacts the control arm,
as shown
in fig. 29. It
will probably be necessary to hold the position control pin in contact
with the cam.
The position control spring length should
be 12%
inches plus or minus
}% inch after the adjustment
has been
made
(fig. 30), Tighten the position control spring lock nut after complet-
ing the adjustment.
After the above adjustments have been made, check the position
of the hydraulic touch control lever and lift arms to be sure they
were not moved while making the adjustments.
(6) Install the hydraulic unit on the tractor,
making
sure that
the end of the control arm enters the opening in the valve control
lever and that the control arm is not bent or damaged
in any way
during this operation. Do not install the inspection plate.
(7) Place
the
position
control
lever
in the
forward
position,
support
the lower
links near
the raised position,
and
place the
hydraulic touch control lever at the top of the quadrant. Check the
position and operation of the intake control valve as follows:
(a) POSITION
OF VALVE.
The
valve
should
be completely
open
when the hydraulic touch control lever is at the top of the quadrant.
The valve is open when, by inserting the hand in the inspection
opening, it is impossible to press the end of the control valve arm
toward the pump face any farther.
(b) OPERATION
OF VALVE.
Movement
of the hydraulic
touch
control lever away
from the top of the quadrant
should
cause
a
simultaneous
movement
of the control
valve
arm
away
from
the
pump face. Movement of the control valve arm should begin at the
start of movement of the hydraulic touch control lever.
There is only one position in which the quadrant support plate
can be located where both of the above conditions will be met. To
find this position, slightly loosen the four cap screws that support
the quadrant. Hold the hydraulic touch control lever at the top of
the quadrant and gently tap the quadrant support plate forward or
backward until both of the above requirements are fulfilled.
(8) Tighten the four quadrant support cap screws securely and
install the inspection plate on the center housing.
§ 143. b. (8)
3730-47]
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