Pressure Reducer - Kalmar DRF420-60S5 Maintenance Manual

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7 Load handling – 7.2.3 Pressure reducer

Pressure reducer, checking servo pressure

Maintenance manual DRF 400–450

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Pressure reducer

Hot, pressurized oil.

Personal injury, burn injury, rash or irritation.

Always depressurize the hydraulic systems before

starting to work on the hydraulic systems. Avoid

skin contact with the oil, use protective gloves.

1 Operate and warm up the machine so that the hydraulic oil

reaches operating temperature, at least 50 °C.

2 Machine in service position, see section B Safety.

3 Depressurize the hydraulic systems, see section B Safety.

4 Turn the start key to position 0.

5 Connect a pressure gauge (0–25 MPa) to the test outlet on the

pressure reducer.

6 Start the engine and check the servo pressure. Compare with

pressure plate.

Turn the steering wheel or activate a load handling function to

activate the hydraulic oil pumps. The servo pressure is higher

than the stand-by pressure of the hydraulic oil pumps.

7 Depressurize the hydraulic and brake systems, see section B

Safety, Hydraulic and brake systems, depressurizing.

8 Remove the pressure gauge and fit the protective cap on the

pressure check connection.

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