UDRF01.04GB
Maintenance manual DRF 400–450
10 Common hydraulics – 10.4.2 Axial piston pump with variable displacement
9
page
–
Hydraulic oil pump, checking
1 Operate and warm up the machine so that the hydraulic oil
reaches operating temperature, approx. 50
°
C.
2 Turn off the engine.
1. Hydraulic oil pump 1
2. Hydraulic oil pump 2
3. Hydraulic oil pump 3
4. Hydraulic oil pump 4
3 Connect pressure gauge to pressure connection on hydraulic
oil pump 1.
4 Start the engine and let it idle.
5 Check the stand-by pressure for one pump at a time in the fol-
lowing order:
Hydraulic oil pump 1: 1.8 MPa
Hydraulic oil pump 2: 2.1 MPa
Hydraulic oil pump 3: 2.9 MPa
Hydraulic oil pump 4: 3.1 MPa
Settings apply to standard machine, certain machines may
have higher stand-by pressure. For correct stand-by pressure,
see pressure plate. However, the pressure difference between
the pumps must always be maintained.
6 Increase engine speed to approx. 1100 r/min and run extension
function against end-position (overflow).
Run out the boom to max and continue to request max. exten-
sion with the control lever. This will cause the overflow of the
extension function.
W A R N I N G
Hot and pressurized oil.
Personal injury, burn injury, rash or irritation.
Always depressurize the hydraulic systems before
starting to work in the hydraulic systems. Avoid
skin contact with the oil, use protective gloves.
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Содержание DRF420-60S5
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