Seymour Duncan 67372 owner manual Sowing Speed, Sowing Depth Control

Sowing Speed

Typical travel speeds when sowing range from 6-12 km/hr in good conditions. In stoney and uneven ground conditions a lower speed is recommended to minimise rapid part deterioration. Sowing too fast can result in:

1Poor contour following and uneven sowing depth.

2Impact damage to:

a Ground engaging components. b Bearings, housings & axles.

c Fasteners & structural components.

3More extreme conditions will result in greater vibration and uneven seed flow at low seeding rates.

Sowing Depth Control

The sowing depth is dependent on:

1The wheel height in relation to the chassis.

2Dragbar spring pre-compression.

3Tyre pressure.

4Ground condition i.e. hard, soft, how even.

The wheel height in relation to the chassis is controlled using the wheel retraction stop. To adjust the wheel height;

aLift the drill using the three point linkage sufficiently to unload weight on the wheel.

bLoosen the M12 nyloc nuts on the clamp plate assembly (1).

cRemove the R clip and pin (2).

dAdjust the wheel retraction stop (3).

eRefit the pin, R clip and retighten the nyloc nuts. Refer Fig 1.

A more consistant sowing depth is acheived with minimal dragbar deflection. With harder ground conditions more spring pre-compression may be required. Adjust the M10 plain nuts

(1)as desired. Refer Fig 2. Note, less spring pre-compression will allow the disc to ride over rigid obstacles, eg stones.

In bumpy or undulating ground conditions the drive wheel will drop away from the wheel retraction stop to maintain seeder drive.

Avoid sowing through dips with a rigid top link. Excessive loads will be transferred through the linkage stays to the wheel which may cause componentry damage. If possible use a floating top link. When sowing over ridges the drive wheel may loose contact with the ground temporary.

Disc penetration ability will improve as discs sharpen with initial use.

2
1	3

Fig 1

1

Fig 2

13	Pt. No. 67372
	Issue 0806