Hudson 480-490 Series Service Manual page 82

76 BODY MANUAL
from upward movement by a hardened steel roller, which
fits over a hardened bushing, riveted in place.
FIGURE 115
The retraction springs, at the lower ends are connected
to this same expansion arm (4), Figure 115, between
the. cylinder and the stanchion side member. The
upper ends of the retraction springs are connected to
the moveable cross arm (3).
The purpose of this method of construction is as
follows: When the window is raised to its upper limit,
fluid is trapped in the cylinder by the action of the
solenoid valve at the bottom of the cylinder. Expan-
sion of the trapped fluid may occur if it becomes
heated through a rise in temperature. Since the piston
rod is rigidly connected to the glass channel through
the regulator assembly, no upward movement of the
piston can occur. Provision for a downward movement
of the cylinder body is made by connecting the lower
end of the cylinder to the pivoted expansion arm. Any
expansion of fluid forces this arm down against the
tension of the retraction springs.
The tension of the springs and the leverage of the
expansion arm have been chosen so that in their ex-
tended position the springs just overbalance the nor-
mal thrust of the cylinder.
For this reason pump pressure must not be raised above
260 P.S.I. With any higher pressure the expansion arm
would be moved downward in normal operation, allowing
no movement of the expansion arm in event the fluid
became heated. Any expansion of the fluid under such
conditions would undoubtedly damage the regulator as-
sembly.
FIGURE 116
DOOR WINDOW REGULATOR
ASSEMBLY
REMOVAL:
1. Remove inside trim and hardware. See Page 81.
2. Remove window glass and frame assembly. See Page
77.
3. Disconnect hydraulic tube (A), Figure 116, and sole-
noid electrical connection (B).
4. Loosen two 1/2" hex nuts (C) and remove upper retain-
ing screw (D).
5. Remove regulator assembly thru bottom opening in
door inner panel.
INSTALLATION:
1. Replace in reverse procedure of removal. Adjust regu-
lator and glass. See Page 88.
NOTE: Manually operated regulator is removed as above
except that it is fastened by screws to the inner panel near
the regulator handle and behind the remote control arm.