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In a new installation, mechanical stops can be installed after
the cylinder. For retro-t applications, use Figure 4.1 as a ref-
erence to ensure the ends of the cylinder travel are outside the
stops. Mount cylinder with the ttings in the up direction.
4.2 HYDRAULIC
The unit is shipped full of oil with a sealed plug in the top of the
reservoir cover. A vented breather cap is supplied with the unit.
The vented cap must be installed in place of the plug after the
drive unit has been mounted. The oil in the LA11 is standard
hydraulic oil (ISO-32).
If the hydraulic lines are removed during installation, be sure to
cap them to minimize the loss of oil. Located on the top of the
valve/reservoir block is a small bleed tting. This tting can be
used add oil to the port and starboard lines or bleed air from
the system. If the cylinder is mounted properly, the cylinder
can be manually stroked and the air will collect at the bleed
tting. Be sure to re-install this plug before using the LA11 as
it is part of the steering line.
The oil reservoir should be maintained at least 3/4 full. During
bleeding and lling this level should be maintained.
It is not critical to identify which of the steering lines is port
or starboard as most new autopilots will determine the pump
direction and program the drive outputs to suit. For older au-
topilots the motor leads can be reversed to change the pumps
direction.
4.3 ELECTRICAL
The motor is a permanent magnet style motor, ignition pro-
tected, built to conform to UL-1500 and SAE-1171 standards.
Two leads connect to the autopilot pump driver junction box
(processor), the direction of the pumpset can be reversed by
simply reversing the polarity of these two leads.
The solenoid valve is connected to the autopilot junction box.
It is usually referred to as clutch/bypass or switched power.
The polarity of the solenoid valve does not matter.
To test the operation of the LA11 pumpset, touch the two leads
from the motor to the supply voltage (12 VDC or 24 VDC) to jog
the motor in one direction and then reverse the leads to jog the
pumpset in the other direction. Do not to perform this opera-
tion where any combustible fumes exist.
p06
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