Vaderstad NZ Aggressive NZA 600 Series, Original Instructions Manual

Page: 41 / 50

NZA 500-1000 /T/ST
11.07.2011
ver.2
41
4.9 Troubleshooting the master and slave system
If the hydraulic master and slave system for depth control of the wheels or Crossboard should start
to give trouble, test the system and trace the fault as follows:
A Check that cultivator's snap-on coupling fits the coupling on the tractor and that neither are
damaged.
B Check that the double-acting functions from the cultivator are connected to the right hydraulic
take-off on the tractor.
C Check that the reverse-action valve for wing folding and the Crossboard is in its end position
for transport and harrowing. If necessary, adjust the valve or move the spring, see
”3.5 Adjust-
ing the reverse-action valve” on page 24.
4.9.1 If the wing sections change relative to the centre section!
D Check the couplings for leakage.
E Check that there is no air in the hydraulic system.
F If necessary, change the seals on the master ram, see ”4.8 Changing the ram seals” on page 40.
4.10 Bleeding the hydraulic system for depth control
To bleed the hydraulic system it is not necessary to unscrew any couplings. You quite simply use
the tractor's hydraulic system.
A Fold out the cultivator to the working position.
A Press out the rams (raise the cultivator). Keep the tractor's hydraulic lever in this position so
that the fluid continues to be pressed out into the rams (about 1-2 minutes). When the first ram
has been filled with fluid, the fluid is pressed further via an overbleed valve to the other ram,
which is then filled with fluid The fluid is then pressed further to the third ram, and so on.