Venting Hydraulic Circuit Of Hydrostatic Steering - Zetor MAJOR CL Operator's Manual

MAINTENANCE INSTRUCTIONS

Venting hydraulic circuit of hydrostatic steering

E722
1. secure the tractor against movement and lift the front axle
2. start the engine and allow it to run for approximately 1 minute in idle run
3. turn the steering wheel several times to both sides with idle run
4. with maximum engine revolutions, turn the steering wheel 3 times alternately slowly and quickly to both
sides to restricting wheel stop
5. stop the engine
6. after completing the venting check or replenish the oil level to control gauge line. Check the tightness of all
joints and hydraulic circuit guide-ways of hydrostatic steering
7. lower the tractor down to front wheels
Replacing the hoses of hydrostatic steering
Hoses need to be replaced four years from the date of their manufacture (date is given on their surface) or
after working 3,500 hours with tractor, or right after learning the symptoms of their damage (hose, local
swelling, penetration of working medium around endpoints and hose surface, wrapping damage by
mechanical smear to a metallic body, damage to external buckle braid with low-pressure hoses).
If a pump gets damaged or if the engine is at standstill, steerability is observed, but the force
on the steering wheel increases. It is possible to get to the nearest place where repairs can be done
with lowered speed. The steering wheel must not be held in the positions of extreme wheel locks for
longn (maximum time is 20 sec.), otherwise there is excessive oil heating in hydrostatic steering
circuit.
Gear system drain plug
Gear system drain plug is placed on the box of front axle
drive.
NM13N068
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