Unsynchronized Wing Folding; Valve Block Cleaning - Vaderstad NZ Aggressive NZA 600 Series Original Instructions Manual

Maintenance and service
4.4

Unsynchronized wing folding

Figure 4.8
Applies to NZA 900-1000
In the case of unsynchronized wing folding on NZA 900-1000 cultivators, the probable cause is
binding of the slide inside the valve block. See "4.5 Valve block cleaning" on page 38:
4.5

Valve block cleaning

Figure 4.9
Applies to NZA 900-1000
A Release the pressure in the hydraulic hoses.
B Detach the hydraulic hoses connected to the valve block.
C Unscrew the valve block from the piston support.
D Dismantle the entire valve block and clean all parts in paraffin or similar solvent. Blow dry
with compressed air.
E Lubricate all the internal parts with oil. Check that the slide in the valve moves freely without
binding. Assemble the valve block.
F Clean all hydraulic connections thoroughly before assembly.
G Then mount the valve block on the cultivator.
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