Hudson 480-490 Series Service Manual page 76

70 BODY MANUAL
FIGURE 100
HYDRO-LECTRIC MOTOR
AND PUMP ASSEMBLY
This assembly is a single unit consisting of an electric
motor, a hydraulic pump, and a fluid reservoir.
The fluid reservoir is correctly positioned on the pump
housing by dowels in the pump casting and is held in
place by a "U" shaped spring wire bail. A detent in the bail
fits into a circular depression in the bottom of the reser-
voir and firmly anchors the reservoir to the pump. A
synthetic rubber gasket fitted into an undercut in the pump
base seals the reservoir to the pump. A hole in the pump
casting near the relief valve plug vents the reservoir to the
atmosphere.
The motor and pump assembly is cushioned on synthetic
rubber and mounted in a well behind the rear seat in the
480-490 series Hudsons. Flexible rubber tubing connects
the pump to the metal hydraulic tubing to prevent any
loosening of connections or breaking of tubing from
vibration of the pump assembly.
A solenoid switch on the outside of the motor housing
activates the unit. An electrical ground is provided
through a ground strap to the car body.
The pump is provided with a combination spring loaded
maximum pressure relief and piston type flow control
valve. See 11 in Figure No. 102. This valve is adjusted to
a minimum fluid pressure of 250 pounds and a maximum
of 260 pounds.
THIS PRESSURE SETTING MUST NOT BE
CHANGED TO GIVE HIGHER PRESSURES.
FIGURE 101
Figure No. 101 is a front view of the hydraulic motor and
pump assembly used for raising and lowering the top and
windows on the convertible brougham. The principal units
of the assembly are as follows:
1. Motor
2. Hydraulic pump
3. Pump reservoir
4. Spring wire bail
5. Solenoid
6. Fluid port
7. Reservoir gasket