Zetor CRYSTAL Series, Руководство оператора, Страница: 154 / 182

Bleeding the hydraulic circuit of the hydrostatic steering
Replacing the hydrostatic steering hoses
The hoses must be replaced after four years from the production date (the date is indicated on their surface)
or after 3500 hours of work of the tractor or immediately after discovering signs of their damage (hose
sweating, local buckling, leaks of the working media around the end pieces and on the hose surface,
abrasion of the hose surface to the metallic reinforcement, damage of the outer yarn braiding in the case of
low-pressure hoses).
In case of a pump failure or after stopping of the engine the steering capability is maintained,
but the required steering force gets higher. You can drive the tractor at a reduced speed to the
nearest workshop. The steering wheel must not be held in the limit turning angle positions for a long
time (the maximum time is 20 s); otherwise the oil in the hydrostatic steering circuit is heated up
excessively.
Replacing coolant
C15N088
Follow the following procedure:
1 - Open the heating cock (B) and release the overpressure plug (A) on the equalizing vessel.
2 - Drain the cooling liquid from the cooler. The drain plug (C) is accessible when the engine bonnet is open.
3 - Drain the cooling liquid from the engine block. The drain plug (D) is located in the left side of the engine
and is accessible when the engine bonnet is open.
4 - When the cooling liquid is drained, close the drain plugs (leave the heating cock open).
5 - Fill the cooling system with the liquid to the neck in the equalizing vessel and close it with the
overpressure plug.
6 - Start the engine and leave it running for ca. 1 minute.
7 - Fill the cooling liquid in the equalizing vessel (A) to the mark MAX.
8 - Close the vessel with the overpressure plug.
When filling the engine cooling system, always use the specified cooling liquid. Never fill the
cooling system with water. Using other than specified cooling liquid may cause engine damage.
1 - Start the engine and let it run at the idle speed for
approx. 1 minute.
2 - Turn the steering wheel several times to both the sides
at the idle speed of the engine.
3 - At the maximum engine speed turn the wheels with the
steering wheel 3 times alternately slowly and quickly to
both the sides up to the limiting stops of the wheels.
4 - Stop the engine and lower the tractor onto the front
wheels.
C15N130
MAINTENANCE INSTRUCTIONS
153