Introduction
Vehicle compressors Series FK 40 of Bock are among the most wide-spread machines
used for bus A/C applications. The criteria that speak for choosing a FK 40 compressor are
its compact dimensions, its low weight, the wide capacity spectrum together with the high
operating safety and service-friendliness.
This maintenance manual is intended to make the repair and maintenance of the FK 40
easier for the servicing personnel. The maintenance manual contains a complete
description of each work step for the disassembly and assembly of the compressor
components. Each step must be carefully adhered to in order to ensure a reliable repair.
Reminder:
For replacing components Bock provides suitable spare part kits. Yet assembly jobs
which go beyond the replacement of the shaft seal, the valve plates and - if there
is one - the capacity regulator (accessory) should be checked carefully for their
economic efficiency beforehand.
The maintenance manual describes the standard type of the FK 40 compressor
which we deliver. Because of different system conceptions, some passages in this
service manual may differ from the unit which you have come across. In these
Safety
Safety instructions
Attention! Refrigeration compressors are machines under pressure and as such
require special care in handling.
Only qualified personnel are allowed to perform any work on refigeration compressors
The national safety regulations, accident prevention regulations, technical rules
and specific regulations (EN 378 and others) must be taken into account
absolutely.
Do not exceed the maximum operating pressure - not even for purposes of checking!
Never put the safety switch out of action!
Prior to commissioning, check whether all the components installed by the user
have been fastened expertly and connected pressure-tight with the compressor
(e.g. piping, plugs, union nuts, replaced components etc.)
Before commissioning, evacuate the cooling system carefully including
the compressor and afterwards charge refrigerant.
Prior to starting the compressor open discharge shut-off valve and suction shut-off
valve.
Do not start the compressor in vacuum. Operate the compressor only when the
system is charged.
According to the conditions of use surface temperatures in excess of 100°C may
occur on the discharge side and temperatures below 0°C on the suction side.
Never grab rotating parts during operation! Danger of injury!
09608-09.03-DGbFEI
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