Zetor 86 41 forterra turbo Operator's Manual page 220

MEDIUM REPAIRS - TRACTORS Z 8641 - Z 11741
To be performed after accomplishing 2400 Oh.
1. Dismantle the turbo-blower compressor box with the filling
piping from the engine.
2. Dismantle the compressor spiral casings.
3. With a brush soaked with a solvent remove impurities de-
posited in the compressor box and on the rotor.
Cleaning with sharp instruments or wire brushes is for-
bidden!
Do not straighten the deformed vanes – if any!
CHECKING THE TURBO-BLOWER FOR TIGHTNESS AND
BEARING PLAY
In case oil leaks from the bearing box around the shaft and
when detecting that the admissible axial and radial plays have
been exceeded, have the turbo-blower repaired in a special-
ized workshop.
When mounting the turbo-blower back to the engine, replace
the hoses at the filling piping and at the turbo-blower oil dis-
charge. Ensure perfect tightness of the two joints. When
mounting the turbo-blower to the engine, pour 0.2 l of engine
oil to the turbo-blower entry opening.
In the case of the long-term putting the tractor out of
operation, the inner turbo-blower preservation must be
renewed!
This preservation renews even by shortly running the engine.
Therefore it is recommended – in the case of the stored trac-
tors fitted with turbo-blowers – start the engine every 3 moths
and keep it running for several minutes. Thanks to that, the in-
ner preservation will renew.
GREASING OF THE HYDRAULIC BRAKE COMPONENTS
Apply special vaseline for hydraulic brakes (for instance Pen-
tosin special) on the brake cylinder couplings, declutching cyl-
inder, and the brake pressure equalizer sliding surfaces from
SCHEDULED TECHNICAL MAINTENANCE
the sealing rings towards the dust protectors. At the same
time, check the brake rubber components for conditions. Re-
place the damaged rubber parts. All the rubber components
must be replaced as late as 5 years after the date of the trac-
tor manufacture.
MAJOR OVERHAUL - TRACTORS Z 8641 - Z 11741
The tractor major overhaul is indispensable when the tractor
operation begins to be anti-economical, most components re-
quire repairs, and the overall technical conditions threaten the
traffic safety.
Providing all the maintenance regulations as required by the
manufacturer's technical documentation have been observed
and the tractor has operated in moderate climate and over flat
terrain , the engine and transmission mechanism mean service
life is 8000 Oh.
That number of operating hours holds providing the following
proportions of the tractor applications:
Plowing and pre-sowing soil conditioning
Sowing and seedling
Harvest jobs
Agricultural transportation
In case the tractor operates in mountain and uneven terrain,
the engine and transmission mechanism service life shortens
by 15-20 %.
If the tractor operates on adverse climatic conditions, the en-
gine and transmission mechanism service life shortens by 15 -
20 %.
Note: The transmission mechanisms involve the front axle,
too.
TECHNICAL MAINTENANCE OF TRACTORS AFTER THE
MAJOR OVERHAUL OF SOME OF ITS ASSEMBLIES
After the major overhaul run-in the tractor as required with the
hints for the new tractor running-in.
220
15 - 25 %
10 - 15 %
10 - 20 %
40 - 65 %