Hardi 3500 EXPLORER, Operator'S Manual

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24
3500 / 4000 EXPLORER
Occasional maintenance
Maintenance and renewal intervals for the next points
depend very much on conditions under which sprayer
operates, and are therefore impossible to specify.
363 pump
NOTE! It is recommended that if one or more
diaphragms and/or valves need replacing they all
should be replaced
Fig 55
Changing valves
1 Remove the valve covers ( A Fig 55). Before chang-
ing the valves ( B Fig 55 & B1 Fig 55) note their
orientation so they are replaced correctly.
2 The two white flap valves ( B1 Fig 55) must be placed
in the valve openings as shown. It is recommended
to use new O-rings (
C Fig 55) when changing or
checking the valves.
Changing diaphragms
1 With the valve covers removed as explained above,
remove the diaphragm bolts (
D Fig 55).
2 The diaphragms ( E Fig 55) may now be changed.
3 If fluids have reached the crankcase, re-grease the
pump thoroughly. Ensure the drain hole at the
bottom of the pump is clear.
NOTE! When tightening diaphragm cover it must
be ensured that diaphragm is in neutral or out . If
the diaphragm is in negative, the edge of the
diaphragm is not seated correctly in the diaphragm
cover. This will damage the diaphragm which will
not seal correctly after being re-assembled.
Rotate the pump until the diaphragm is neutral or
out.
4 Reassemble with torque settings as in Torque (P 32).
E
A
B
B1
C
D
A = Valve Cover
B = Valves
B1 = White Flap Valves
C = O-rings
D = Diaphragm Bolt
E = Diaphragm
Fig 53
11 Hoses and tubes
Check all hoses and tubes for possible damage and
proper attachment. Renew damaged hoses or tubes.
Check the condition of the bearings the following way:
1 Place stop wedges in front of and behind the left
hand wheel and jack up the right hand wheel.
2 Support the trailer with axle stands.
3 Remove the wheel.
4 Remove the hub cap ( A Fig 54), cotter pin ( B Fig 54)
and castle nut ( C Fig 54).
5 Pull off wheel hub. Use a wheel puller if necessary.
6 Check roller bearings for discoloration and wear -
renew if worn or damaged.
7 Assemble the hub and bearings using a new sealing
ring (
D Fig 54).
8 Fill the hub and bearings with fresh grease before
fitting to the shaft.
9 Fit castlelated nut. Rotate hub and tighten the
castelated nut until a slight rotation resistance is felt.
10 Loosen the castelated nut again until the first notch is
aligned with the cotter pin hole in the shaft.
NOTE! The shaft has a vertical and a horizontal
cotter pin hole. Use the one first aligned with the
notch when loosening the castlelated nut.
1000 Hours / Yearly Service
12 Wheel bearings
A
B
C
D
Fig 54