35
ALPHA
Cone check/renewal, EC distribution valve
Periodically check the distribution valves for proper seal-
ing. Do this by running the sprayer with clean water and
open ON/OFF valve and all distribution valves.
Cautiously remove the clip
A
and pull out the hose
B
for the pressure equaliza-
tion device. When the hous-
ing is drained, there should
be no liquid flow through
the pressure equalization
device. If there is any leak-
age, the valve cone
E
must
be changed.
Remove the clip
C
and lift
the EC-motor housing off
the valve housing. Then un-
screw the screw
D
and re-
place the valve cone
E
. Re-
assemble in opposite se-
quence.
Wear bush renewal, boom lift
The wear bushes are inspected and renewed before
they are worn through.
1. Unfold the booms to working position.
2. Lift the boom centre frame with a lifting device and
support it until the load is taken off the parallelogram
arms.
3. Remove the screws
A
, pull out the pins
B
at one of
the upper parallelogram arms, and renew the wear
bushes.
4. Refit the arm.
5. Repeat this on the other upper arm.
6. The lower arms must be disconnected simultane-
ously.
7. Grease all grease nipples.
8. Remove the lifting gear again.
Ball seat check/renewal, EC on/off valve
If the main ON/OFF valve does not seal properly (drip-
ping nozzles when main ON/OFF valve is closed), the
ball and seat should be checked.
Remove the 2 bolts fixing the main ON/OFF pressure
valve unit to the bracket, unscrew the union nut
A
and
pull the valve away from the distribution valves.
Pump valves and diaphragms renewal
Valves
Remove valve cover
1
. Before changing the valves
2
,
note their orientation so they are replaced correctly.
NOTE: One special valve with white flap
2A
is used. It
has to be placed in the valve opening shown.
It is recommended to use new gaskets
3
when changing
or checking the valves.
Diaphragms
Remove the diaphragm cover
4
. The diaphragm
5
may
then be changed. If fluids have reached the crankcase,
re-grease the pump thoroughly. Check also that the
drain hole at the bottom of the pump is not blocked. Re-
assemble with the following torque setting:
Pump
Diaphragm / valve cover
Diaphragm
Model
Nm
bolt Nm
462
90
80
1 Nm = 0.74 lbft
A
Check the ball for sharp edges and scratches and check
the ball seat for cracks and wear - replace if necessary.
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