27
ACQUAINTANCE WITH TRACTOR 
C137 C138 C139 
CONTROL PANEL OF HEATING, AIR-
CONDITIONING, RADIO 
A -  control of heating valve 
B -  control of blower 
C -  switch of air-conditioning 
D -  control of air circulation in cab 
E -  space for additional radio installation   
 
 
 
 
 
 
 
 
 
 
 
CONTROL OF HEATING VALVE (A) 
a -  heating valve closed 
b -  heating valve open 
CONTROL OF BLOWER (B) 
0 -  blower switched-off 
1 -  blower low speed 
2 -  blower middle speed 
3 -  blower maximum speed 
 
 
 
 
 
 
 
 
 
 
AIR-CONDITIONING SWITCH (C) 
Switch-in and switch-off of the air-
conditioning system is made by switch 
with symbol of flake (C). 
By depression of the switch, the air-
conditioning system is put into operation 
(symbol of flake lights). 
By repeated depression of the switch, 
the air-conditioning system is put out of 
operation (symbol of flake does not 
light).