29
•
Tightening is complete when no more than half a turn of the hub is caused by
vigorous hand rotation.
•
Partially loosen the nut until the hub rotates freely and repeat the tightening.
•
After repeated rotation locking, loosen the nut by 30º max. until the immediate
nut locking with the pin is possible. Mark the position with a line.
•
From the marked position, unscrew the nut by half a turn and, with a gentle tap,
press the hub against the nut as far as it will go.
•
Tighten the nut to the position marked with the line.
•
Fit the hub cover.
NOTE! During maintenance work, the unit should be secured against rolling
(it should be connected to the tractor with the parking brake on) and
unfolded.
Operation of the brake system (pneumatic system)
The three-range brake force regulator is not adjustable under normal use. It should be in
a central position. If the braking force deviates from that of the tractor, the regulator can
be adjusted to avoid incorrect road behaviour. When making any change, be sure not to
cause an accident or damage to the machine.
The removal of condensed water in the tank is carried out by means of a valve located
underneath the tank. The stem must be pressed, which will cause the compressed air to
displace the water. Releasing the stem will automatically close the valve. Once a year
(before winter) the drainage valve should be unscrewed and cleaned.
Checking the pneumatic system involves visually inspecting for leaks, especially at the
connection points (when checking the system, the pressure should not be less than 6
atmospheres). If hoses, seals and other system components are damaged, this will
manifest itself as hissing. Bubbles will appear at small leaks (check by applying wash
liquid).
Damaged components should be replaced with new ones.
Braking adjustment
– braking deceleration levelling, should be carried out when:
•
As the lining jaws wear during use and as a result of the resulting clearance, the
braking force decreases,
•
the wheel brakes brake unevenly and inconsistently.
To do this, the position of the spreader arm on which the piston rod of the pneumatic
cylinder acts must be changed. Change the starting angle of the spreader shaft on the
multi-shaft end and correct the length of the linkage on the bolt. Adjustments should be
carried out for each wheel separately.
6.
Replacement procedures
Bearing replacement.
If the bearings are damaged, they must be replaced:
•
place the machine on a horizontal surface,
•
unscrew the four screws holding the ball bearings on each side,
•
move the tubular shaft away,
•
loosen the two headless screws on each bearing and pull off the bearings using an
extractor,
•
fit the new bearings loosely onto the shaft,
•
roll the shaft between the bearing plates and screw the bearings to them. Screw in
headless screws using adhesive to prevent loosening.
