SAC 3600 Series Operator's Manual page 39

CONTROLS
be greater than the charge pressure. The system pressure is an indication of how much power is being required to
turn the augers and to mix material in the mixer. System pressures can vary depending on the amount of material
being mixed, the type of material in the mixer, sharp, dull, or no knives on the augers, and the position of the hay
restrictors. Normal system pressures can be anywhere from 400 psi to 5800 psi. At no time should the system
pressure be greater than 5800 psi. The higher the system pressure is, the more power is required to operate the
mixer. Generally, a system pressure in the 2500-4000 psi range is adequate to mix a full load of most materials.
If a warning is displayed for low system pressure, ensure that the oil reservoir is filled to the appropriate level, the
tank mounted shutoff valves are fully open, check for twisted or pinched suction lines, check for hydraulic leaks in
high pressure hoses, and ensure that the charge filters are not plugged and going into bypass mode. Also check
the tank mounted suction strainers for becoming plugged with debris. Low system pressure can be coupled with
low charge pressure symptoms. System pressure should never be lower than 145 psi. If none of the above fix the
problem, service to the hydrostatic pumps or motors may be necessary.
If a warning is displayed that indicates the system pressure sensor has either high or low voltage, inspect the
sensors and wiring for unconnected plugs or damaged wires. If all plugs are connected and wires are intact, the
sensor itself should be tested or replaced. A high or low voltage condition will result in erratic pressure readings.
High Speed Cleanout Mode will be disabled if any of the system pressure warnings occur. High Speed Cleanout
Mode relies on system pressure readings to the electronic control system to ensure that the mixer is not being
shifted to High Speed Cleanout Mode during a period of time with excessive system pressure to prevent damage to
the hydrostatic drive system and components.
High Speed Cleanout Mode is also disabled when the system pressure of either one or both of the augers is greater
than 1500 psi. If the operator attempts to shift the mixer into High Speed Cleanout Mode when the system
pressure is greater than 1500 psi, a warning will appear to alert the operator to unload more material before
shifting. If, when in High Speed Cleanout Mode, the system pressure increases past 1500 psi, the system will shift
back to Low Speed to avoid damage to the hydrostatic drive components.
If a warning appears for low system pressure, or high or low sensor voltage when the mixer is in High Speed
Cleanout Mode, the mixer will automatically shift back to Low Speed to avoid damage to the hydrostatic drive
components.
Auxiliary Pressure Voltages
The Auxiliary pumps control the auxiliary hydraulic functions of the mixer. These include the operation of the front
and rear (if so equipped) doors, the conveyor slide, and the conveyor discharge apron motor. Pressures for these
two circuits can be viewed on the display to diagnose potential problems. For example, if the conveyor stops with
feed on it, the operator can view the pressure of this circuit to determine if the conveyor has stalled due to
material being jammed in the conveyor or if the auxiliary pump has failed. If pressure is noted on the display, it
shows that material has jammed in the conveyor and the pump is working.
The electronic control system relies on these pressure sensors for relaying information to the operator. If a high or
low voltage warning appears, the operator should inspect the sensors and wiring for unconnected plugs or
damaged wires. If all plugs are connected and wires are intact, the sensor itself should be tested or replaced. A
high or low voltage condition will result in erratic pressure readings.
Low Oil Level
The mixer is equipped with a level sensor in the hydraulic oil tank. An adequate volume of oil must be present in
the hydraulic tank to ensure that the system continues to operate correctly. A lack of oil requires the same oil to
circulate more often and does not allow the oil to cool properly. A low oil condition can result in high oil
temperatures during operation which can damage the hydrostatic pumps and motors. If a low oil warning appears
on the display, the operator should check the hydraulic tank, hoses, fittings, and cylinders for leaks and repair as
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