6. Operating checks and
repair work
6.1. Checking operation of air cleaner
maintenance indicator
Every 250 hours of operation, perform a routine
check on the maintenance indicator or mainte-
nance switch and the display light.
– Detach the capsule hood or side trim
(see Chapter 2).
Electric maintenance switch
– Turn switch key to position I (Figure 12).
– Pull hose „2“ off air intake pipe and build up a
strong vacuum at the open end (Figure 37).
Indicator light „5“ will come on (Figure 13).
If this response is not obtained, check the fol-
lowing points:
– electrical section: cable connections etc.
– Indicator light
– function of maintenance switch.
Mechanical maintenance indicator
– Pull hose „2“ off air intake pipe and build up a
strong vacuum at the open end (Figure 37).
Red zone „1“ will appear and engage in posi-
tion (Fig. 20).
– After the functional check, release red zone „1“
by pressing reset knob „2“.
Renew any defective components without delay.
6.2. Renewing fan drive belt, checking
operation of belt monitor
– Remove one machine screw at belt pulley „1“
(Figure 38).
– Press back tensioning pulley „2“ and lock it
with the machine screw provided.
– Unscrew and remove the belt pulley.
– Take off the Poly-V belt.
Note:
If any grooves on the belt pulley have broken off
or are bent, always renew the pulley.
Checking operation of belt monitor
Always check operation of the shutdown device
when the belt is renewed.
– Remove the machine screw to release the pis-
ton with tensioning pulley „1“ (Figure 39).
– Spring pressure will force the piston with ten-
sioning pulley out of the housing.
– Angled lever „2“ rotates downwards and re-
leases shutdown pin „3“.
Important !
Shutdown pin must be forced out by spring
loading or else automatic shutdown will not take
place if the belt breaks.
Installing the fan drive belt
– Push in shutdown pin „1“ (Figure 40).
– Push piston with tensioning pulley „2“ into
housing „3“ and lock with the machine screw.
– Place the Poly-V belt centrally on the fan
pulley and install the tensioning pulley and the
lower belt pulley (Figure 41).
– Retain the belt pulley with one machine screw
„1“ without pushing it fully on to the centering
hub (Figure 42).
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