SHB 28Z3 EN – Edition 2.0 * 28z3s510.fm 5-7
Hydraulic system
☞ Remove the spring and the underlying spring centring mechanism
☞ Pull the drive unit out of the pump
➥ Hold the mounting plate with the pistons
☞ Remove the underlying cradle from the pump
☞ Remove the piston and stop studs with the spring seats from the pump
➥ The length of the stop studs varies, note the correct position
➥ Also note the number and position of the spring seats
☞ Remove the circlip with circlip pliers
☞ Knock the shaft out of the housing by tapping lightly with a rubber hammer
➥ The rotary shaft lip seal and the grooved ball bearing are also loosened at the same
time and can be removed
Fig. 5: Remove the spring
Fig. 6: Pulling out the drive unit
Fig. 7: Removing the stop stud
Fig. 8: Removing the circlip
Fig. 9: Removing the shaft
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