Brandt SB4000, Руководство оператора

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3.5.2 ADAPTING THE HYDRAULIC SOLENOID BLOCK FOR A OPEN
CENTRE HYDRAULIC SYSTEM
GENERAL INFORMATION
The reaction speed of the booms when raising and/or lowering is directly related to the tractor’s ability to supply oil
pressure and flow to the sprayer. Weak hydraulics result in poor boom performance.
When selecting the sprayer pump, one needs to consider the age and health of the hydraulic system on the tractor.
With this in mind, the best scenario is to power the sprayer pump with the largest oil flow at the lowest pressure. In
general terms, large displacement orbit motors work best with open center hydraulic systems.
Performance of the NORAC Auto Boom height controller may be affected by the tractor’s hydraulic capabilities.
The tractor’s ability to supply pressure and flow will determine how fast the booms raise and lower and how steady
the sprayer pump speed remains as the pressure and flow change. Weak hydraulics result in slower boom response
times and large sprayer pump speed fluctuations. If the tractor has a poor ability to maintain a constant oil flow and
pressure, performance of the 3 port flow control valve supplied in this kit may be compromised.
Proper setting of the flow control valve is required so that heat generation is kept at a minimum. Oil temperature is
related to how much heat is created by the hydraulic components in both the tractor and sprayer and how much
heat is removed by the oil cooler. Older tractors often have weak hydraulics and poor oil coolers. It may be
necessary to service the oil cooler so that the oil temperature is kept as low as possible. An external hydraulic oil
cooler may need to be added to the tractor if the OEM cooler is found to be insufficient. If the tractor has a flow
control device as standard equipment it will be necessary to operate it in the fully open position when the tractor is
connected to the sprayer.
The Open Centre Hydraulics Kit can be purchased from Brandt, part no. C005974.
INSTALLATION
1. Before installing any components from this kit, attach a flow and pressure meter to the tractor to determine the
hydraulic system’s actual output. Make sure the oil is warm and the engine is running at the speed it will be
turning when the unit is in the field. If the tractor’s hydraulic system has a flow control in it, make sure it is
turned to the wide open position.
2. After determining the hydraulic system’s capability, check to make sure that the right sprayer pump has been
chosen for the tractor. From the readings taken in step 1, choose the sprayer pump that is the best fit. Keep
in mind that large displacement orbit motors work best with open center hydraulic systems.
20 to 32 GPM Hypro HM-1
15 to 25 GPM Hypro HM-4
Less than 15 GPM Ace 206
Available Tractor Oil
Supply
Spray Pump