Zetor 3321 SUPER, Operator'S Manual

Page: 157 / 233

156
ADJUSTMENT
Dop 5 Dop 6
TRACTOR BRAKE SYSTEM
BLEEDING
Do it in the following order.
Bleed the system with unlatched pedals
separately for each wheel. Follow these
instructions:
Important
When bleeding the brake
hydraulic circuit, one pedal (1)
must be pressed by 7,5
+0,5
mm -
measured on the main brake valve
piston rod i.e. 3
+0,2
mm on adjusting
screw (2) and the second pedal is used
for bleeding. To be able to keep the right
distance, insert the flat gauge of
corresponding thickness between pedal
(1) and adjusting screw (2) i.e. 3
+0,2
mm.
1. BLEEDING OF TRAILER AIR BRAKE SYSTEM
Bleed the system at working air pressure 730
“
20 kPa.
- Add the missing volume of brake fluid at the brake fluid reservoir up to max. level.
- Remove plugs from vent screws (2) of trailer control valve (3) located on the right
hand side of tractor between fuel tank and axle.
- Slide the hose on the vent screws and put the other end of hose into the
transparent reservoir (4) partially filled with brake fluid. Place the reservoir
minimally 300 mm above the vent screw. The vent screws must be permanently
under pressure to avoid aerating of brake system through the screw threads.
- Loosen the bleeding screws max. by 1/4 turns.
- Process for bleeding is the same as mentioned in -
Important (see page 156).
- Fully press the pedal which is not blocked by gauge and tighten the adjusting
screw.
- Release the brake pedal and repeat the process so long until bubbles come from
the hose.
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