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LONG 6 mm
PLUMBING
BOLT
PRESSURE
GAUGE
PRESSURE
RELIEF VALVE
1-3. Hydraulic Adjustments
a. Fluid Level.
The fluid level should be approximately 1/2" below
the filler hole or gasket surface. If additional fluid is
needed, remove the filler vent cap with a phillips
screwdriver and add fluid through this opening
using a funnel. See figure 1-19.
NOTE
The elevation cylinder should be com-
pletely down and all the other control
functions in their neutral position when
checking oil level.
c. Pressure Relief Valve
The pressure relief valve is adjusted by turning the
adjustment nut until the desired pressure is reached.
To adjust:
1. Remove the plumbing bolt securing the
brake system line to the pressure relief valve and
attach a hydraulic pressure gauge as shown in
figure 1-20 using a long 6mm plumbing bolt.
2. Raise the table top until the piston reaches
the end of its stroke and stalls. Observe reading
on pressure gauge and turn the adjustment nut
(clockwise to increase oil pressure, counter-
clockwise to decrease) until desired reading is
obtained. Pressure should be 80KG/CM† -1138
PSI.
d. Speed Controls
The speed controls restrict the volume of oil return-
ing back to the reservoir thereby controlling the
speed of each control function.
All four-way mini-valves, have two speed controls
located in the ends of each valve body. All three-
way mini-valves have only one speed control.
Figure 1-19.
The type of oil that should be used is Mobil DTE #25
or equivalent. This is a very high quality hydraulic
oil. The table requires approximately two quarts of
oil to operate properly.
b. Bleeding The Hydraulic System
To purge the air from the hydraulic system, operate
each function back and forth at least two or three
times.
NOTE
Whenever a hydraulic line or com-ponent
is replaced, bleed the air out of the lines
using the pump pressure before mak-
ing the final connection. Then operate
the function until it stalls in both direc-
tions.
Figure 1-20.
RESERVOIR
OPENING
FILLER
CAP
FILLER VENT
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