Zetor 3321 SUPER Operator's Manual page 121

HYDRAULIC BRAKE AND TRAVEL CLUTCH CONTROL
FLUIDS
Brake fluid SYNTHOL 205 yellow according to PND 31-656-80
(classification of fluid according to ISO regulation 4925 or SAE
J 1703).
The fluid is not intended for arctic conditions.
WARNING:
1. Fluids of the same classification can be mutually mixed
2. Brake fluid must be exchanged minimally once per two
years independently on operation hours
FUEL
Summer diesel fuel NM-4 according to - SN 656506 for period
from 1 April to 31 October.
Winter diesel fuel NM-22 according to - SN 656506 for period
from 1 November to 31 March.
NOTE: Similarly the suitable fuels must be used abroad .
ANTIFREEZE FOR COOLING SYSTEM AND HEATING
Antifreeze FRIDEX-STABIL or FRIDIOL 91 and demineralized
water in ratio 1:1,5 (add the mixture in this ratio ).
Antifreeze liquids exchanged abroad must contain anti-
corrosion additives protecting all materials of cooling system
and tractor heating (including rubber parts and cylinder head
gasket ).
WARNING:
1. Antifreeze FRIDEX STABIL and FRIDIOL 91 are mutually
mixable.
2. Above mentioned liquids must not be mixed with liquids of
another marks.
3. Exchange the liquid after two years.
USED LIQUIDS AND FILLS