Specifications

MORRIS Industries Ltd.
5-15
Operation
Hydraulic Depth Control System
Five Section Models
The hydraulic depth control system is a series
system.
To lift the Maxim Air Drill, hydraulic fluid is forced
into the butt end of cylinders 1. This causes the
piston rods to extend, pivoting the packers and
gauge wheels down. This causes the main frame to
raise.
Simultaneously, hydraulic fluid is forced from the
gland end of cylinders 1 through the pilot operated
check valves to the butt end of cylinders 2, causing
them to extend, pivoting the packers and gauge
wheels down. This causes the inner wings to raise.
Hydraulic fluid is forced from the gland end of
cylinders 2 to the butt end of cylinders 3 , causing
them to extend, pivoting the packers and gauge
wheels down. This causes the outer wings to raise.
Finally the fluid exits the gland end of cylinders 3
into a common line and then to the tractor. Once
the tractor hydraulic lever is released the pilot
operated check valves close, isolating the Maxim
Air Drill hydraulics from the tractor.
To lower the Maxim Air Drill, hydraulic fluid flows
through the cylinders in the reverse direction to that
described above, until the stroke control collars seat
firmly on the gland end of the cylinders. This causes
the flow of oil from the tractor to stop.
With the stroke control collars firmly seated, the
cylinders will hold this working depth until the tractor
hydraulic controls are activated to lift the Maxim Air
Drill.
Note: A one-way flow restrictor valve is
incorporated into the hydraulic system to
maintain a positive oil pressure.