Pressurizing the cylinder.
Standard Navtec cylinders are equipped with an air pressure return. This return is pressurized
through the ‘tire’ valve at the clevis end of the cylinder. A bicycle pump or service
station air hose can be used to charge the return up to 100 psi. The air pressure should be
adjusted to give the desired rate of return.
WARNING:
Once charged, do not attempt to disassemble the cylinder. Only an
authorized Navtec Hydraulic Service Center or Navtec Inc should do this.
How and when to bleed
the system.
After installing the panel, cylinders, and plumbing, oil should be added to the reservoir and the
system bled of all air. Each cylinder and line must be bled separately.
Step 1.
Open release valve fully. If system is multi functioning, select function to be bled first.
Step 2.
With hose attached to cylinder, extend cylinder fully. If there is air pressure in lower
chamber the cylinder will extend automatically.
Step 3.
Disconnect hose at cylinder. Note: Always disconnect slowly to allow remaining pressure
to decrease slowly. Be prepared for possible oil drips.
Step 4.
Close release valve and pump, holding the hose end in a can to collect oil. When oil is
bubble-free, reconnect hose to cylinder.
Step 5.
Pump cylinder all the way down (with cylinder detached from rigging). Then open release
valve and allow cylinder to return fully. Check to be sure there is sufficient oil in the
reservoir so that it won’t run dry.
Step 6.
Repeat above procedure for each cylinder and line.
Step 7.
Check oil level / do not overfill.
Adjusting the relief valve.
The relief valve (#5) is factory-set to approximately 4000 psi. Adjustment is provided by the 1"
(25mm) round threaded cap in the aluminum valve block at the back of the panel. Maximum
relief setting is 5000 psi. Turning the cap counter-clockwise will lower the setting. Clockwise
will raise it. The adjustment is about 1000 psi per complete turn. To determine the setting with-
out tensioning the rig, disconnect any cylinder from the rigging and pump that cylinder until
it bottoms and the relief valve engages, which will be evident when continuous pumping fails
to raise the gauge pressure. The maximum pressure observed is the relief valve setting.
Operating Instructions
For Single Function System
(Without Selector Valve)
To increase tension in the cylinder, make sure that the release valve is closed. Do not over
tighten. Doing so will shorten the life of the valve. Then pump. The valve body has a special
zero-leakage check valve so no manual-locking valve is necessary. To reduce tension, open
the release valve. Remember that it is not necessary to turn very hard to close the valve.
continued on back...
(in
3
)
(cm
3
)
(in)
(mm)
(in)
(mm)
(in)
(mm)
2 Qt.
60
983
6.88
174.8
8
203.2
4.88 124
4 Qt.
120
1967
7.75
196.9
10.88
276.4
5.75 146.1
Table II
RESERVOIR CAPACITY & DIMENSIONS
SIZE
USABLE VOL
X
Y
DEPTH
X
Y
