Duncan Enviro 740, Owner'S Manual

Page: 31 / 72

29
Pt. No. 67304
Issue 1217
fig 37
1
Remove buildup
of dirt behind
the ‘V’ seal.
Clean right into
this corner.
fig 38
Double Disc
Casting
2 1
6 Coulter Bearings
Front coulter bearings are sealed and do not require lubrication.
Check discs for any lateral movement (wobble) on a regular
basis. Replace bearings if there is any noticeable wobble.
7 Double Disc Scrapers
The double disc coulter is equipped with two scrapers to
remove sticking soil. These scrapers have been set by the
factory in such a way so that they lightly touch the discs without
having a noticeable braking effect. After extensive use of the
drill a certain amount of wear may be evident on the scrapers.
The scrapers should be reset using the adjusting bolt so they
just touch the discs as described above.
Refer Fig 37/1.
In some cases if a notch has formed on either of the blades by
the abrasive action of the coulter disc you may need to re-grind
the leading edge to give optimum cleaning action or replace.
8 Double Disc Bearings & Seals
Check that the discs are free from wobble and the bearings run
smoothly. Replace any worn bearings. Check for dirt buildup
behind the rubber ‘V’ seals on the double disc castings. Clean
right into the corner as in Fig 38 and check that the “V” seal
bearing surface is not damaged and is free from rust.
It is recommended to replace the inner “V” seals when the
bearings are replaced.
9 Compensating for Disc Wear
When discs wear in diameter (to 13”) remove the M16 light flat
washer (38/1) so the discs meet. Also remove the nylon washer
(38/2).
10 Rubbing Blocks
Check the plastic rubbing blocks on each side of the front
coulter arms for wear and replace if necessary.
11 Front Disc Pressure Adjustment
Check fasteners regularly on front discs and also on spring
coulters.
12 Depth Control
Grease threaded depth stop.
Check for dirt buildup around the rod seals at the piston head to
ensure seal damage does not occur.
13 Press Wheels
Scrapers will wear.The rate being dependent on the ground
conditions. The minimum clearance is 2mm. In some conditions
a greater clearance may give better performance.
14 Tyre Pressure
The recommmended tyre pressure is 1.8 bar (25psi). Check
tyre pressure regularly to ensure correct pressure is maintained.
Weekly checks are recommended.