Zetor 8621 Forterra turbo Operator's Manual page 227

PLANNED TECHNICAL MAINTENANCE ' GENERAL REPAIR
General repair of tractor must be done in case that its farther
operation is not economical anymore. If many parts need
repair and the complete technical status of tractor jeopardizes
the safe operation.
The middle life of engine and transmission is 6000 hours if all
regulations for maintenance are kept according to the
technical documentation of producer when working in normal
climatic conditions and in even terrain.
This number of hours is valid if the following tractor working
conditions are taken into consideration:
tillage and sowing preparation
sowing
harvesting
agricultural transportation
If the tractor works in hilly conditions the life of engine and
transmission is reduced by 15-20 %.
If the tractor works in worse climatic conditions the life of
engine and transmission is reduced by 15-20 %.
Note:
Front driving axle is also considered as a transmission.
TECHNICAL MAINTENANCE
GENERAL REPAIR
Run-in the tractor after general repair according to rules for
running in the new tractor. Do the maintenance as on the new
tractor.
15 - 25 %
10 - 15 %
10 - 20 %
40 - 65 %
OF TRACTOR AFTER
227