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48 HC 920 • HC 940 • HC 960
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Servicing
10. Servicing
10.1 General servicing
The unit should be serviced once a year by the Wagner Service.
1. For servicing of the gasoline engine, refer to the engine
instructions.
2. Check the high-pressure hoses for damage.
3. Check the inlet and outlet vents for wear.
4. Check oil level in hydraulic oil tank.
5. Carry out an oil change if necessary.
10.2 Checking the oil level in the hydraulic oil
tank
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Gasoline units — Check oil level daily.
Danger
Electric units — Switch off unit “O” (OFF).
Remove the mains plug from the socket.
1. Turn oil measuring stick (fig. 18, item 1) to the left and pull
out.
2. The oil level should be visible between the marking (see
arrows) on the oil measuring stick.
3. If necessary, refill oil. For information on the oil grade,
refer to the oil change section, chapter 10.3.
min:
max:
1
10.3 Oil and oil filter change ot the hydraulic oil
pump
Carry out oil and oil filter change once every 12 months.
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Danger to the environment
Do not dispose of waste oil into the sewer or soil.
Polluting the ground water is a crime. Waste oil
can be returned where hydraulic oil is bought.
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Carry out an oil change while the unit is still
warm from operation.
Danger
Electric units — Switch off unit “O” (OFF).
Remove the mains plug from the socket.
1. Turn off the gasoline engine or electric motor.
2. Move the hydraulic ball valve (fig. 19, item 1) on the
material feed pump to its vertical position (open).
3. Remove the screws on the hydraulic oil pump cover (2)
and remove cover.
4. Turn oil measuring stick (3) to the left and pull out.
5. Screw out oil filter (4) with a strap spanner and replace.
6. Screw out sealing screw (5) under the hydraulic oil tank.
Drain the waste oil.
7. Replace the sealing screw into the hydraulic oil tank.
8. Fill in 4.7 liters of ESSO NUTO H 32 hydraulic oil.
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When oil is filled in, air can enter the
hydraulic system. Therefore, the system must be
vented.
9. Let the unit run for at least five minutes at low pressure to
automatically bleed the air from the hydraulic system.
3
1
5
42
10.4 High-pressure hose
Inspect the high-pressure hose visually for any notches or
bulges, in particular at the transition in the fittings. It must be
possible to turn the union nuts freely.