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SHB 28Z3 EN – Edition 2.0 * 28z3s312.fm 3-31

Maintenance

3.13 Pressure check

General • Run the machine warm before checking the pressure! Hydraulic oil temperature: 50 °C

min. (operating temperature)

• Pressure drop is checked by reducing revs from maximum to idling speed at constant

load

• Set the primary pressure limiting valves (PPLV) at maximum engine speed.

• The pressure settings are listed in chapter “Specifications”

– see Hydraulic system on page 2-3

• Ensure utmost cleanliness of all measuring points and ports, micro measuring

lines and pressure gauges that are connected for checking pressure => even the

slightest traces of dirt, e.g. a grain of sand, can impair tightness and cause leaks

Overview of measuring ports (up to serial number AG02712)

Notice!

Measuring ports Fig. 36 and Fig. 37 differ in design only. The pressure check is

carried out in the same way.

Overview of measuring ports (from serial number AG02713)

Fig. 36: Measurement ports

Pos.

Designation

Pump 1 measuring port MP 1

Pump 2 measuring port MP 2

Pump 3 measuring port MP 3

Pilot oil supply unit measuring port MP 4

Fig. 37: Measurement ports