SHB 28Z3 EN – Edition 2.0 * 28z3s510.fm 5-11
Hydraulic system
☞ Fit the set screw and sealing washer with an Allen key
➥ Use a new sealing washer
☞ Restore the original setting of the set screw in accordance with the mark made during
dismantling
➥ Non-compliance with the original setting results in engine droop
☞ Then secure the set screw with the locknut
➥ Tightening torque 14.7 – 19.6 Nm (10.8 – 14.5 lbs/ft)
☞ Fit the O-rings on the housing on the gear pump side
➥ Use new O-rings
☞ Fit the coupling and ring into the housing
☞ Fit the gear pump and screw tight with the two fastening screws and washers
➥ Tightening torque 19.6 – 23.5 Nm (14.5 – 17.3 lbs/ft)
☞ Fit the O-rings on the housing on the pilot oil supply unit side
➥ Use new O-rings
☞ Fit the pilot oil supply unit and screw tight with the three fastening screws and washers
➥ Tightening torque 20.6 – 25.5 Nm (15.2 – 18.8 lbs/ft)
After completing assembly, ensure that the shaft of the hydraulic pump can be turned
smoothly by hand.
Fig. 24: Fitting the set screw
Fig. 25: Mounting the coupling
Fig. 26: Mounting the gear pump
Fig. 27: Fitting the O-rings
Fig. 28: Fitting the pilot oil supply unit
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