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 syn-
thetic rubber and mounted in a well behind the rear seat.
Flexible rubber tubing connects the pump to the metal hy-
draulic tubing to prevent any loosening of connections or
breaking of tubing from vibration of the pump assembly.
A solenoid switch on the outside of t he 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 max-
imum pressure relief and piston type flow control valve. See 11 in
Figure No. 139. This valve is adjusted to a mini mum fluid pressure
of 250 pounds and a maximum of 260 pounds.
THIS PRESSURE SETTING MUST NOT BE
CHANGED TO GIVE HIGHER PRESSURES.
SERVICE PROCEDURES
NOTE: Before removing any hydraulic unit, two precau-
tionary steps are to be taken.
1. Disconnect negative battery cable at battery.
2. All hydraulic fluid must be removed from the system.
CAUTION: This fluid is extremely injurious to painted or
lacquered surfaces, and it is highly inflammable. Sparks
from accidental grounding of electrical connections may
ignite the fluid.
To remove hydraulic fluid, raise the car on a hoist and
remove cover plate (A) from the bottom of the well contain-
ing the Motor and Hydraulic Pump Assembly. See Figure
142. Remove the reservoir bail (C) and the reservoir (D), and
empty the contents into a clean dust-free container.
With a helper in the car to operate the top, hold the
empty reservoir in position on the bottom of the motor and
pump assembly so that the fluid pick-up is two to three inches
FIGURE 142
from the bottom of the reservoir. This prevents fluid being drawn
back into the system during the bleeding operation.
Using the dash mounted top operating button, move the top up and
down manually until all fluid is expelled from the system. Top must
be moved slowly and steadily to prevent excess strain on top parts
or top operating cylinders.
When all fluid is out of the system, empty the reservoir and
replace it on the pump.
Before disconnecting any hydraulic lines, place clean rags un-
der the connection to soak up any fluid that may drip from the line
when the connection is broken.
MOTOR AND PUMP ASSEMBLY
REMOVAL
1. After all fluid has been completely removed from the hydraulic
system and while the car is still raised on the hoist, remove the
two nuts (E), Figure 142, and lockwashers from the lower motor
and pump assembly support.
2. Lower the car and remove the rear seat cushion and seat back.
(See Page 109 for seat back removal.) Remove motor and pump
assembly cover.
BODY MANUAL 98
Summary of Contents for 1948 Commodore
Page 1: ......
Page 2: ...This manual courtesy of Hudson Essex Terraplane Club member Drew Meyer...
Page 45: ...BODY MANUAL 40 MODELS 1948 1949 FIGURE 78...
Page 46: ...41 BODY MANUAL MODELS 1950 FIGURE 79...
Page 47: ...BODY MANUAL 42 MODELS 1951 FIGURE 80...
Page 48: ...43 BODY MANUAL MODELS 1952 FIGURE 81...
Page 49: ...BODY MANUAL 44 MODELS 1953 EXCEPT 1C AND 2C FIGURE 82...
Page 50: ...45 BODY MANUAL MODELS 1953 1954 1C 1D 2C 2D AND 3D FIGURE 83...
Page 51: ...BODY MANUAL 46 MODELS 1954 4D 5D AND 7D FIGURE 83...
Page 84: ...79 BODY MANUAL MODELS 1948 1949 FIGURE 13...
Page 85: ...BODY MANUAL 80 FIGURE 114...
Page 86: ...81 BODY MANUAL Figure 115...
Page 89: ...BODY MANUAL 84 FIGURE 117 FIGURE 118 FIGURE 119...
Page 126: ...121 BODY MANUAL ALL CONVERTIBLE MODELS 1954 FIGURE 189...
Page 143: ...REFERENCE Source of Information Date Subject...
Page 144: ...REFERENCE Source of Information Date Subject...
Page 145: ...REFERENCE Source of Information Date Subject...
Page 146: ...REFERENCE Source of Information Date Subject...
Page 147: ......
