Service and maintenance
Additional air cleaner 121
Engine air precleaner, two-stage
The precleaner is located above the engine hood on the end of the
air inlet pipe. The first stage (E) separates dirt (larger impurities)
which then are returned immediately to the ambient air. The
second stage (H) traps remaining impurities in a bowl (I) which are
removed via an outlet pipe(A) through the silencer (B).
Clean the precleaner every 250 hours.If the main filter needs
to be cleaned or changed more often than every 1000 hours
due to the machine's operating conditions, it is an indication
that the precleaner also needs to be cleaned more often.
Cleaning the engine air precleaner
1 Disconnect the outlet pipe (A) from the second stage (H).
2 Start the engine and run at high idle.
3 Check if the suction (vacuum) in the outlet pipe is acceptable
by placing a piece of paper over the end of the pipe.
– If the paper stays in place, the suction is strong enough.
– If the suction is not strong enough, check that there is nothing
blocking the air flow in the pipe. If there is no obstruction in the
pipe, disconnect the pipe from the silencer. Check the suction
in the pipe's connection on the silencer. If there still is no
suction, change the silencer.
4 Turn off the engine.
5 Check that the flap is loose (rattles) in the non-return valve (C)
by shaking it.
6 Loosen the clamp and separate the tapered adapter (G) from
the second stage (H).
7 Check if there is dirt in the second stage.
8 Clean the bowl (I) and the connection for the outlet pipe (J) with
compressed air if there is dirt.
9 Reconnect the outlet pipe to its connection.
10 Turn the precleaner (E, F, G) upside down.
11 Insert your hand and spin the rotor.
WARNING!
Always use safety glasses and suitable clothing when
using compressed air.
WARNING!
Be careful when inserting your hand, the stop plates in the
precleaner may be sharp. Do not use compressed air on the
rotor, this may cause personal injury.
1020077
A
B
C
D
E
F
G
H
A Outlet pipe
B Silencer
C Non-return valve
D Ejector port
E First stage
F Netting
G Tapered adapter
H Second stage
1020079
H
I
J
H Second stage
I Bowl for trapping dirt
J Connection for outlet pipe
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