Zetor MAJOR HS, Operator'S Manual

Page: 117 / 140

Coolant replacement
When opening the heating valve, the key of the switch box must be in the position 'l'.
Loosen the overpressure plug only after the coolant cools down! Scald danger!
Carry out a renewal of the antifreeze every time after two years of service at the latest.
Observe the following procedure:
1. open valve of heating (A) and release safety plug on
equalizing tank (B)
MHS16N041
2. drain coolant from radiator (C). Draining screw is
accessible after lifting the bonnet
3. drain coolant from the block of engine (D). Drain valve
is accessible after lifting the bonnet
4. after draining the coolant, close the screw and valve
(leave heating valve open)
NM15D021
5. Fill in the cooling system with an antifreeze
6. Start up the engine and keep it running for cca 1 minute
7. Top up the antifreeze in the equalizing reservoir up to
the upper mark labelled with MAX
8. Close up the equalizing reservoir with the overpressure
plug
9. After having the engine warm up and the thermostat
open let the coolant cool down again and check the
coolant and top it up once more if necessary
10. Bleed the heating system if need be
NM14D022
MAINTENANCE INSTRUCTIONS
116