Hudson 1948 Commodore, Service Manual

Page: 123 / 147

and connecting a jumper from the battery terminal to the
switch terminal. If solenoid is satisfactory, the solenoid will
"click", and the motor will operate. If no click is heard with
the jumper in place, the solenoid switch should be replaced.
WINDOW POWER VALVE SOLENOID CHECK
In normal operation the window power valve solenoid
should make a distinct "click" when the window control
switch knob is moved up or down. If this click is not heard,
check the window control switch.
When the window control switch operates satisfactorily,
remove the trim panel to expose the window operating cylin-
der. The solenoid valve can frequently be freed by several
sharp taps on the base of the cylinder. If the solenoid contin-
ues inoperative, check the small copper ground wire on the
base of the cylinder to see that it is not broken or unsoldered.
Break the snap connection in the wire from the switch to the
cylinder and connect a jumper from the cylinder wire to the
hot " BAT" terminal of the window operating switch. If the
click is still not heard, the solenoid is defective and cylinder
must be replaced. If the click is heard with the jumper in
place, the wire between the window operating switch arid the
cylinder should be replaced.
HYDRAULIC SYSTEM
PRESSURE RELIEF A ND FLOW CONTROL VALVE
A piston type, spring loaded pressure relief and flow
control valve controls the fluid pressure of the hydraulic
pump, Figure 184. The valve (A) is adjusted to a minimum
of 250 pounds and a maximum of 260 pounds per square
inch, and under no circumstances should it be changed to
provide a higher pressure. In conjunction with. the tension
spring on the valve, washers are also added under the head
of the plug to allow for necessary adjustment or variation in
pressure. The addition of washers reduces the pressure while
the removal of washers increases the pressure. When clean-
ing and servicing this valve, USE THE SAME WASHERS
THAT WERE REMOVED, AND ALWAYS BE SURE
THAT
FIGURE 184
THAT THE SAME NUMBER OF WASHERS ARE RE-
PLACED WHEN REINSTALLING THE PLUG.
TOP OPERATING CONTROL VALVE
Unsatisfactory operation of the hydraulic system may
result from scored or worn faces in the top operating valve,
allowing internal leakage from one port to another. A check
of this condition may be made at the top operating valve.
First make sure the top control rod has proper clearance and
that the self centering springs in the valve return it properly
to a neutral position. Then, holding a cloth below the
connection to catch any spilled fluid, disconnect the fluid
return line at the top operating valve. (The fluid return line
is the lower of two lines entering the left side of the top
operating valve.) DO NOT MOVE TOP OPERATING
KNOB WHIT THIS LINE IS OPEN.
With the fluid return line open, raise one or two win-
dows. Any internal leakage or pressure loss in the valve will
be indicated by a discharge of fluid from the valve port.
Such discharge indicates a defective valve and replacement
should be made.
BODY MANUAL 118