Vaderstad NZ Aggressive NZA 600 Series, Original Instructions Manual

Page: 40 / 50

Maintenance and service
40 11.07.2011
ver. 2
4.7 Wheel changing
Figure 4.11
Release the hydraulic pressure. Undo the nut and bolt round the uprights on the rocker tube and
twist the hydraulic ram towards the drawbar. Pass a chain round the wheel axle and raise it by
means of a loader or jack. The wheel can then be removed with ease.
When changing a wheel on the outer section the ram need not be removed.
4.8 Changing the ram seals
Figure 4.12
A Loosen and screw out the piston rod guide A using the caliper spanner B.
B Withdraw the piston rod. The seal can now be changed. NOTE: Take great care to ensure that
the seals face the right way round.
C Carefully check that tubular casing C is not scratched or scored.
D Fit in reverse order.
When changing the ram seals, the overbleed groove or holes should always be cleaned with fine
emery cloth along the length of the ram. Rinse the ram thoroughly before assembly.
NOTE! Check that the seals are correctly fitted.
Mount the ram on the cultivator and bleed the hydraulic system, see ”4.9 Troubleshooting the
master and slave system” on page 41.