13 © 2012 Installation and Reference Manual D0125 Rev. H
Section 2 — Mechanical and Hydraulic Adjustments
1. Drive Wheel Spring Tension
When the drive wheels are fully clamped on the rail, the red spring should be compressed to 2-inch in height. Turn the nut
at the bottom of the threaded rod assembly to adjust the spring’s tension. Slightly less compression is okay for lighter
gates. (See illustration on page 11.)
2. Drive Rail
Verify that the drive rail does not move more than 1-inch up and down or ¼-inch side-to-side throughout the
entire horizontal travel of the gate. Re-alignment is simple if the rail is mounted with U bolts. Adjusting the rail
for side-to-side movements requires inserting shims between the rail and the gate where necessary. To adjust
side-to-side movements, loosen the U bolts and add or remove shim stock. To adjust up or down, loosen the U
bolts and simply tap the rail with a hammer until the correct height is reached.
3. Brake Valves
This operator is equipped with brake valves, their proper adjustment is
important for smooth operation of the gate. In order for the brake
valves to have time to function, the limit ramp must trigger the
limit switch at least two inches before the point at when you want
the gate to stop. Adjustment of the brake valves, one for each
direction of travel, will determine how quickly the gate actually stops. If
adjustment is needed, loosen the 9/16-inch lock nut on the top of the
brake valve and make ¼-inch incremental turns on the adjustment stem
with an Allen wrench. The adjustment is counter-intuitive, such that a
counter-clockwise adjustment stops the gate more rapidly. If the
adjustment is set too loose, the limit ramps will bang into the drive
wheels. If the adjustment is set too tight, the system pressure will
increase, the gate speed may decrease and the gate will jerk to a stop.
Brake valves are factory-set to midpoint, two turns. This should be
sufficient for most applications. If the switch stops more than two inches
into the limit ramp, increase braking. When the adjustment is complete,
retighten the locking nut to hold the setting.
4. Pressure Relief Valve
This valve governs the maximum system hydraulic pressure. It is located
on the backside of the pump. The pressure relief valve is factory set
and may need to be adjusted depending on the gate weight. Refer to the
yellow tag wire tied to the unit, and follow the instructions.
NOTE: The only way to display the actual relief valve setting is to unplug
the hydraulic hoses from the quick disconnect fittings and run the
operator. View the setting on the pressure gauge. Retighten the locking
nut to hold the desired setting and reconnect the hoses correctly.
5. Open Valve
The open valve is solenoid operated and, when energized, directs the
hydraulic flow to open the gate. No adjustment of this valve is possible
or necessary. The black solenoid coil mounts on its valve stem.
Optional brake valves CCW = quicker stop
Left valve controls open
Right valve controls close
“Right Hand” Hose connections shown
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