Zetor PRIMO HT 20 NC, Operator'S Manual, Page: 80 / 134

1. The tire pressure must be correct.
2. Check that the height of the mower blades is adjusted as shown below. Then tighten the lock nuts
tightly.
3. Turn the cutting height adjustment control to ''2.0'' and the anti-scalp roller so that the ground
clearance between the rollers and the surface is between 6 and 13 mm (0.25 to 0.5 inches).
4. Turn the right knife by hand parallel to the direction of travel.
5. Adjust (L) the front links with the lock nuts so that the distance A is 0 to 5 mm (0 to 0.2 inches) A = (R)
- (F).
6. If the difference between the front tip and the rear tip of the blade is not within the factory setting
specification, adjust the L length of the front link using the screw (3). The height of the tip of the R rear
blade should not be greater than that of the front.
NOTE
L - MM54: 530 mm ± 5 mm
Left and Right Cutting Height Adjustment
1. The tire pressure must be correct.
2. Move the hydraulic lever back to raise the mower deck to the highest position.
3. Stop the engine and remove the key.
4. Turn the control to adjust the cutting height to the required height.
5. Set the anti-scalp roller so that the ground clearance between the rollers and the surface is between
6 and 13 mm (0.2 to 0.5 inches).
6. Lower the mower deck by moving the hydraulic control lever forward.
7. Turn the left blade by hand so that it is parallel to the tractor axle and the right blade is parallel to the
axle, and from outside measure the distance of the blade tip from the surface on the right and left
side.
8. The difference between the measured values should be less than 3 mm (0.12 in).
9. If the difference between the values is greater than 3 mm (0.12 in), release the lock nut on the left
side.
10. Adjust the cutting height using the exact cutting height adjustment screws so that the difference
between the distances on the left and right is less than 3 mm (0.12 in). Then tighten the nut.
Difference (L-P) Factory
specification
Between the left and
right tips of the
blade Less than
3 mm (0.12 in)
MOWER DECK
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