Wacker Neuson 803 Dualpower, Service Manual

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4-32
SHB 803 en – Edition 2.4 * 803s410.fm
Engine
4.29 Oil pressure switch
☞ Remove the cable connection from the oil pressure switch (in the area of the cutoff
solenoid).
☞
Start the engine, check for correct idling speed.
☞ Measure the resistance of the oil pressure switch as shown by means of an ohmmeter.
➥
Oil pressure switch is OK: infinite resistance.
➥ The oil pressure switch is malfunctioning if the oil can pass.
•
The oil pressure can also be measured with a mechanical dial gage.
☞
Remove oil pressure switch A and replace it with the dial gage.
☞ Start the diesel engine and measure the oil pressure.
➥
Replace the oil pressure switch if malfunctioning or determine the cause for insuffi-
cient oil pressure.
4.30 Checking the coolant circuit
Leakage check
☞ Fill up the radiator correctly.
☞
Install test appliance on the radiator as shown.
☞ Increase the pressure in the cooling system by means of a hand pump to about 0.75 –
1.05 bar
(10.8 – 14.8 psi).
➥
If the pressure drops at the pressure gage, check the lines and the connections for
leaks and repair them.
Checking the radiator cap
☞ Remove the radiator cap and install it on the test appliance as shown.
☞
Increase the pressure by means of a hand pump to about 0.75 – 1.05 bar (10.8 – 14.8 psi).
➥ The radiator cap must open within this pressure range.
4.31 Cleaning the cooling water channels
☞ Let the engine and the cooling system cool down.
☞
Remove the radiator screw plug.
☞ Drain the coolant – see chapter Draining coolant on page 3-25
☞
Rinse the cooling circuit.
☞ Add coolant – see chapter Checking the coolant level/adding coolant on page 3-23.
Measurement prods
Fig. 51: Oil pressure switch
Fig. 52: Position of oil pressure switch
A
Fig. 53: Checking the radiator for leaks
Radiator cap
Fig. 54: Checking the radiator cap