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Linear Vibration Welder 4000 Series, Model VWA User's Manual
Keep this in mind as moisture draining to the floor could
cause a problem. The total drain line length should be
less then 16.5 ft (5 m). The internal float will open under
pressure above 22 psi (0.15 MPa) when approximately
3
25 cm
= 25 ml (0.85 ounce) of water has accumulated.
Hydraulic System
Hydraulic Pressure
The pump is set to deliver up to 1500psi at a maximum
operating temperature of 150° F. After an extended period
of use, the hydraulic reservoir, pump, motor and heat ex-
changer can become very hot. Use caution to avoid burn-
ing yourself. Let the unit cool down to a safe temperature
before attempting any maintenance or adjustments.
Hydraulic Fluid Level
The reservoir has a capacity of 20 U.S. gallons or 75.7
liters. Maintain the fluid level to appear at the center of
the sight gauge. This corresponds to about 18.5 gallons
or 70 liters. If you have to add fluid after use, you obvi-
ously have a leak somewhere. Do not operate the machine
until the hydraulic leak has been identified and repaired.
Hydraulic Fluid Change
Under light to normal operating conditions, the fluid
should be changed every four years or 10,000 operational
hours, whichever occurs first. If the fluid starts to darken
or appear cloudy, it should be changed immediately. De-
teriorated hydraulic fluid reduces component life and is a
potential danger to operating personnel. Hydraulic fluid
is not expensive, and fresh fluid is good insurance against
having to replace a costly hydraulic pump.
To drain the hydraulic fluid, unscrew the filler cap shown in
Figure 11-3 and remove the filter element and basket. Use a
hand pump or electric pump inserted into the filler opening
to empty the fluid into a safe storage container. Do not use
the drain plug at the bottom of the reservoir. This will cre-
ate a mess of used hydraulic fluid in the floor of the cabinet
because the drain plug does not have a shut-off valve.
After draining the reservoir, some fluid will remain in
Page 134
Continued from Previous Page
Figure 11 - 2 Replacing Air Filter Element
Figure 11 - 3 Draining and Adding Hydraulic Fluid
Replaceable
Filter Element
Twist 90°
and Pull
Retainer
Down
Hydraulic
Fluid Filler
Drain Plug
Cap
(don't use)
Dukane Manual Part No. 403-592-00
Continued
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