SHB 28Z3 EN – Edition 2.0 * 28z3s510.fm 5-9
Hydraulic system
☞ Fit the shaft, grooved ball bearing, rotary shaft lip seal and circlip into the housing in this
order
➥ Use a new rotary shaft lip seal and apply a thin layer of lubricant to the surface of the
sealing lips before assembly
☞ Fit with auxiliary tool Fig. 16 while tapping lightly with a rubber hammer
➥ For easier installation place the housing on the counterpart
☞ Secure the shaft with the circlip
☞ Assemble the stop studs and spring seats (2 x) and then insert them into the pump
housing
➥ Ensure that the stop studs and spring seats are correctly positioned
➥ The stop studs have various lengths and must be fitted in the original position,
otherwise the tilting angle is changed.
➥ Insufficient output and engine droop would result
☞ Insert the piston into the housing
➥ Ensure the correct installation position
☞ Place the balls into the corresponding holes in the cradle
➥ Use grease if the balls do not remain in position in the cradle
☞ Insert the cradle with the two balls into the pump housing
Fig. 14: Fitting the shaft
Fig. 15: Fitting the rotary shaft lip seal
Fig. 16: Auxiliary tool
Fig. 17: Inserting the piston
Fig. 18: Inserting the piston
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