Bleeding Of Tractor Brake System; Deaeration Of The Main Brake Valve For Trailers - Zetor MAJOR HS Series Operator's Manual

Bleeding of tractor brake system

Perform deaeration of the brake system of the tractor
always in the following order:
1. Main brake cylinders
2. Pressure air brake system for trailers
3. Foot brakes of rear wheels
Perform deaeration of main brake cylinders, pressure air
brake systems for trailers and foot brakes of rear wheels
with connected brake pedals.
During deaeration observe the amount of liquid in the
balancing tank to avoid intake of air.
After two years replacement of the brake fluid in the whole
brake circuit must be performed.
Only hydraulic mineral oil Titan ZH LHM PLUS can be used in the brake system.
1. Deaeration of main brake cylinders
Use the following procedure:
1. Add the missing amount of the brake fluid in the
equalizing vessel to the max. amount.
2. Remove the caps from deaeration screws (2) of main
brake cylinders (1) located on the right side of the tractor
between the cabin and the engine.
3. Install hoses on the screws and immerse their other
ends to the bottom of the transparent vessel (3) partly
filled with the brake fluid. Place the vessel at least 300 mm
above the deaeration screws. The screws must be
permanently under pressure to prevent air penetration
through their threads.
4. Release the deaeration screws by 1/4 revolution max.
5. Press down the pedals fully and tighten the deaeration
screws.
6. Release the brake pedals and repeat the procedure
until no air bubbles come out of hose.

2. Deaeration of the main brake valve for trailers

Should be performed under operating pressure of the air in the system 600 ± 20 kPa with the following
procedure:
1. Add the missing amount of the brake fluid in the equalizing vessel to the max. amount.
2. Remove the caps from deaeration screws (2) of the main control valve of the trailer (1) located on the right
side of the tractor between the battery and rear half-axle.
3. Install hoses on the screws and immerse their other ends to the bottom of the transparent vessel (3) partly
filled with the brake fluid. Place the vessel at least 300 mm above the deaeration screws. The screws must
be permanently under pressure to prevent air penetration through their threads.
4. Release the deaeration screws by 1/4 revolution max.
5. Press down the pedal fully and tighten the deaeration screw.
6. Release the brake pedal and repeat the procedure until no air bubbles come out of hose.
ADJUSTMENT
E758
124
MHS16N050
MHS16N075