Wacker Neuson 28Z3, Service Manual

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4-16
SHB 28Z3 EN – Edition 2.0 * 28z3s410.fm
Engine
4.14 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 OK: infinite resistance
➥
The oil pressure switch is defective if the oil can pass
The oil pressure can also be measured with a mechanical dial gauge
☞
Remove the oil pressure switch and replace with the dial gauge
☞
Start the diesel engine and measure the oil pressure
➥
Replace the oil pressure switch if defective or determine the cause for insufficient oil
pressure
4.15 Checking the coolant circuit
Leakage check
☞
Fill up the radiator completely
☞
Mount an adapter on the radiator as shown
☞
Increase the pressure in the cooling system by means of a hand pump to about 1 bar
(15 psi)
➥
Check the lines and the connections for leaks if the pressure drops at the pressure
gauge
Checking the radiator cap
☞
Remove the radiator cap and mount it onto the adapter as shown
☞
Increase the pressure to about 1 bar (15 psi) (stamped onto the radiator cap) with the
hand pump
➥
The radiator cap must open within this pressure range
4.16 Cleaning the cooling water channels
☞
Drain the coolant – see chapter Draining coolant on page 3-23
☞
Fill the cooling circuit with water
☞
Let the engine run at idling speed for about 5 – 10 minutes
☞
Drain the water from the cooling circuit again
☞
Refill the coolant – see chapter Checking/filling up coolant on page 3-22
4.17 Coolant and fuel hoses
☞
Check the coolant and fuel hoses regularly to ensure that they are not kinked, cracked
or damaged
➥
Renew coolant and fuel hoses every 2 years
Measurement
Fig. 24: Oil pressure switch
Fig. 25: Checking the radiator for leaks
Radiator cap
Fig. 26: Checking the radiator cap