7065-SBXX Power Assist Cylinder
Kobelt Manufacturing Co. Ltd
Rev A
MNL-7065-SBXX
9 of 18
3.2
H
YDRAULIC
Exercise safety precautions pertaining to hydraulics including:
•
Wearing safety glasses.
•
Exhausting pressure and locking out the pressure
source.
•
Being qualified to work on hydraulics.
•
Never look for a leak by running your hand/fingers
along a pressurized hydraulic line.
Before connecting the hydraulic lines to the cylinder ensure that all the hydraulic lines in the
steering system have been flushed and that the hydraulic oil is free of any contamination. The
cleanliness of the system must be at an ISO 4406 rating of 20/18/15 or better.
All connections are made to the valve. Hydraulic connections are specified in Figure 2 on page
7. The pressure line should have a minimum pressure rating of 2250 psi. Pressure and tank
lines should also have an isolation valve. If required, a secondary slave cylinder can be
connected to the valve which allows for additional rudder torque. Secure the piping against
vibration with pipe clamps spaced every 3 feet (1 m).
ISO VG 32 is recommended for most steering system installations. If the environment is
exceptionally warm or cold, then viscosity grades 46 or 22 should be considered, respectively.
Do not use transmission or brake oil.
Failure to flush the system can result in premature failure of cylinder
components and seals.
