Hydraulic system
When you plan to use the CVM120/CVU200 valves, make sure that:
• You use the CVU200 valve only in a system with a load-sensing pump and an LS
line.
• The CVM120/CVU200 valves are not applicable to use in closed-circuit hydraulic
systems.
• The hydraulic fluid viscosity must be a minimum of 15 cSt. The recommended
viscosity is 25–50 cSt.
• The hydraulic fluid must be clean and its quality must be in accordance with ISO
4406. The minimum quality of the hydraulic fluid is 18/16/13.
The recommendations for the system filtration are in the table that follows:
Hydraulic supply
High pressure filter (P) Return line filter (T)
Reservoir and pump in the tractor
Required
Optional
Reservoir and pump in the trailer
Optional
Required
• The hydraulic fluid temperature must be below 75 °C.
• You must monitor the hydraulic fluid temperature level during operation.
• It is very important to make sure that the cooling is sufficient during the use of the
Hill descent control (HDC) option. If the cooling is not sufficient, the hydraulic fluid
temperature can raise during the continuous use of the HDC function at high
pressure. The conditions that have an effect on the necessary cooling capacity
are, for example:
• The working pressure
• The flow
• The ambient temperature
• The duty cycle.
Note:
The working pressure line (P) of the system must have a pressure relief
valve to limit the main pressure before the CVM120/CVU200 valve.
• We recommend that the hose sizes you use agree with the connections on the
valve. Very small hose diameter causes pressure loss and interference in the
operation.
• The position of the drain line (“C” in the hydraulic connection diagram) branching
point must be as close to the valve as possible.
• You can use the pressure accumulators in the motor case drain-lines to extend
the lifetime of the motor sealing. The use of the accumulators:
• Can cut the case pressure peaks during drive activation
• Makes the transition smoother from high flow drive to the freewheeling mode.
• Refer to the product manual of the motor series for more detailed information.
4.3
System design
Product manual
13
