System 50 is designed for improved functioning at all levels – operational, mechanical, and ergonomic. It also is designed to accommodate a two-speed auto-pump or a hydraulic power pack. The end result is an advanced, flexible, intelligently designed hydraulic control system for yachts 35 to 70 feet long. Installation Instructions: Locate the panel position keeping in mind normal position of crew members while pumping. Use a high quality marine sealant between panel and bulkhead to prevent leaks. Mount the separate reservoir with the hose fittings at the bottom. Be sure to leave room above the removable cap at the top of the reservoir for filling. See Table II for reservoir capacity and dimensions. If possible, the bottom of the reservoir should be above the pump as pump suction will be more positive, but this is not essential for satisfactory operation. Place the reservoir as close to the pump as possible to minimize the effect of pitch and heel. Installing Plumbing:

Connect either hose barb at the bottom of the reservoir with the pump intake hose barb (#l), using the low pressure hose supplied. Be sure there is a plastic oil filter in this line. (part # HO-012)

Connect the other hose barb on the bottom of the reservoir with hose barb (#2) on the back of the panel, using a second low pressure hose.

A single high pressure reinforced hose or stainless steel tube (rated for at least 5,000 psi) must be run from the valve on the central panel to each operating cylinder. High pressure hose, cylinders and boom vangs are available from your Navtec distributor.

If the panel is single function, the hose or tube runs from fitting (#3).

If multiple function, the hose runs from I of 4 ports on 4-way selector valve (#4).
For push-pull cylinders, when a 4-way valve is used (this is different than the 4-way selector valve), consult your Navtec distributor or Navtec Inc. for plumbing instructions.

For the System 50 with a two speed pump you have two returns to the reservoir. One from the manifold #2, the second from the pump #6. You will need a “t” fitting. (not included)

Information and advice on oil and filter:

Navtec recommends the following oils: Shell Tellus T15®, Mobil DTE 11M®, Texaco Rando HD215®, Royal Purple Syndraulic 15®. Never use brake fluid because it will attack the seals. Oil should be checked periodically for cleanliness. Any particulate matter in the oil will decrease the life of the moving parts and may also cause malfunctions. The oil filter should be changed if there is any indication of pump skipping due to oil starvation. If using a system in cold climates contact Navtec.

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 by 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 multifunction, 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.

Relief Valve Adjustment:

The relief valve (#5) is set at the factory 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 without tensioning the rig, disconnect any cylinder from the rigging and pump that cylinder until it bottoms and the relief valve lifts, 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 a 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. Now 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, it is not necessary to turn very hard to close the valve.

Note: The single-function panel can be converted to the multi-function panel at a later date. The conversion part number is A320-SMC-01.

For a Multi-Function System (WITH selector valve): This system operates the same way as the single function system (see above), except that the selector valve must be positioned before pumping, or releasing tension. To position, turn the selector valve handle toward the valve port (at rear of valve) to which the appropriate hose is attached. Function labels are available from Navtec at no charge.

Two-speed pump version: The two-speed pump will automatically shift down from the low(high flow) gear when the internal pressure shift point is reached. The shifting point is adjustable to suit the desired level of pumping pressure needed to physically operate the pump. To adjust the shifting point turn the set screw on the back of the pump counter clockwise to lower and clockwise to raise (#7). To check what pressure point the auto shift valve is set at, disconnect a cylinder from the rigging and pump it down until the pressure builds. Upon reaching the set pressure, the 2 larger pump pistons will close and the pump will suddenly become easier to operate. The shift pressure point can be noted by reading the gauge when it shifts. The standard pressure setting as set at the factory is 1800 lbs.

Reading the Gauge:
The Navtec gauge has a double ended needle so that two scales can be used. The top scale which reads in thousands of pounds per square inch, is always included and indicates the pressure within the cylinder and the connecting plumbing. A lower scale which reads in thousands of pounds of force, can be overlaid on the gauge face if the cylinder size is known. These gauge face overlays are available from Navtec at no charge. Please specify cylinder size when ordering. The pressure within the system can be converted to actual force exerted by the cylinder using Table IV or the formula below:

Pressure(lbs/Inch2) x Cylinder area (Inch2) = Force (lbs)

Gauges have a backing card that is specially treated to provide night illumination. If backing card does not provide enough light, recharge by passing a flashlight beam slowly over the gauge.