Zetor 8621 Forterra turbo Operator's Manual page 226

PLANNED TECHNICAL MAINTENANCE ' MIDDLE REPAIR
This is carried out after 2400 hours.
AT TRACTORS Z 8621 - Z 10641
1. Disassemble the compressor case of turbocharger with
inlet manifold.
2. Disassemble spiral of compressor.
3. Remove impurities sedimented in compressor case and on
the rotor by brush with solvent.
Cleaning by sharp subject or by wire brush is
forbidden!
Do not repair eventually deformed blades!
INSPECTING THE TIGHTNESS OF TURBOCHARGER AND
THE BEARING PLAY
In case the oil penetrates from bearing case round the shaft
and in case the allowed radial and axial bearing play is
exceeded, let the turbocharger repair in specialised workshop.
Exchange the hose at inlet manifold and at outlet of lubrication
oil from turbocharger when reassembling the turbocharger to
the engine. Fix the proper tightness of both connections. Fill
0,2 litres of engine oil into inlet oil opening when reassembling
the turbocharger to the engine.
The inner conservation of turbocharger must be done if
the tractor is a long time out of operation.
This is done even after short starting the engine. That „s why
we recommend to start the turbocharged engine minimally
once per three month at tractor out of operation and let the
engine run for few minutes. The inner conservation is done by
this way.
LUBRICATING THE ELEMENTS OF HYDRAULIC BRAKES
At moving parts i.e. brake cylinders, clutch cylinders and brake
equaliser, coat the sliding surfaces from sealing rings in
direction to the outer dust rings by special vaseline for
hydraulic brakes (for example Pentosin special). In the same
time inspect rubber parts of brakes. Exchange damaged
rubber parts. Exchange all rubber parts at least up to five
years from date of tractor manufacturing.
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