SAC 3600 Series Operator's Manual page 37

Charge Filter Bypass Condition
If the warning for a charge filter in bypass mode is shown prior to the scheduled filter service interval, this is an
indication that the filter has become plugged and needs to be changed within a short window of time. The
warning is shown when the differential pressure in the filter is near 45 psi. At 50 psi, the filter will go into bypass
mode. When the filter is in bypass mode, oil from the charge pump will be directed around the filter and directly
back to the tank. When this happens, the pump will not have enough oil to stroke the pump and turn the augers in
the mixer. Running the pumps for an extended period of time with the filters in bypass mode will cause damage to
the pumps. If only one filter indicator shows it is time to be replaced, both should be replaced as a preventative
measure.
Oil Temperature
If the oil temperature is below 32°F, the control system will not allow the augers to turn faster than 6 RPM until
the oil temperature is above 32°F. This limits the flow of cold oil needed in the high pressure lines and also limits
the amount of work that the charge pump is required to do. Cold oil is thick and can cause cavitation within the
charge pump. It is advised to not run the engine faster than an idle when warming the oil to reduce the amount of
vacuum at the suction inlet of the pump. The augers can be run at 6 RPM during warm up to aid in heating the cold
oil.
If the oil temperature is above 160°F, High Speed Cleanout Mode will be disabled. If the mixer is in High Speed
Cleanout Mode when the High Oil Temperature warning is displayed, the mixer will continue to operate in High
Speed until it times out or the operator shifts back to Low Speed. After this point, the mixer will not shift to High
Speed Mode until the oil temperature drops below 160°F. When oil warms past 160-180°F the oil begins to break
down. The hydrostatic pumps and motors that are found on this mixer are designed to run with oil temperatures
of not more than 160°F. If the oil temperature is higher than this, components in the pumps and motors will begin
to wear prematurely.
If the oil temperature is warm, check that the oil cooler fans are working properly and that the oil cooler fins are
clean and not plugged with debris. Check the oil level in the hydraulic tank to ensure that it is filled to the
appropriate level. Reducing the speed of the augers during mixing and increasing the length of time between
mixing cycles will assist in keeping the oil temperatures lower on hot days.
If no oil temperature is detected, the system will not disable High Speed Cleanout Mode or enter the system to
Warm Up Mode. Check the sensor and wiring for damage and replace as necessary. Ensure that the oil
temperature is within the operating range as to not damage the system by running it too cold or too hot.
Speed Sensor Failure
The electronic control system relies on speed sensors located in both auger drive motors to maintain the speed of
the augers during mixing, unloading, and high speed operation. If the system does not detect a signal from one or
both speed sensors, conditions may be applied to the operation of the system to reduce the possibility of damage
to the drive components. Situations that would result in the system not receiving a speed signal would include a
broken or cut wire, a loose or unplugged connection, or a sensor failure.
If the system is being operated in normal mixing/unloading mode and the system does not receive a signal from
the front auger, the auger speeds cannot be controlled independently. In this instance, the front auger speed will
match the speed of the rear auger and be controlled with the Rear Auger Speed Control adjustment knob on the
console. Likewise, if the system does not receive a signal from the rear auger, the rear auger will be controlled
with the Front Auger Speed Control adjustment knob on the console.
If the system does not receive a speed signal from both of the augers when operating in normal mixing/unloading
mode, High Speed Cleanout Mode will be disabled and will not be able to be used until at least one of the augers
can send a speed signal. If the mixer is operating in High Speed Cleanout Mode when both augers fail to send a
READ complete manual CAREFULLY Page | 18
OPERATION
Page # 37
BEFORE attempting operation.
REPLACEMENT PARTS