Great-plains PFH-20 Operator Manual User Manual download pdf (Page 18)

Section 2 Operating Instructions

PH-15, PH-20, PFH-15 and PFH-20 Coulter Command System 148-384M 6/21/2004

Great Plains Mfg., Inc.

WARNING

Make sure all people, animals, and objects are clear of the

coulter tool bar before switching the tongue hydraulics to the

AUTO mode.

Turning the coulter depth switch clockwise makes the

coulters run shallower, and turning the coulter depth

switch counterclockwise makes the coulters run deeper. If

the Precision Hitch is not moving or is on a hard surface,

turning the coulter depth switch may not cause the tongue

cylinder to retract to the desired position. The coulters may

not penetrate to the desired depth until the Precision Hitch

is moving. A pulsing of the valve may be the only reaction

when adjusting the COULTER DEPTH knob on a station-

ary machine. The coulter depth setting can always be

changed "on-the-go" if you desire.

With the AUTO-MANUAL switch in the AUTO mode, the

coulters will always maintain a consistent depth regard-

less of terrain, soil type or speed. When lifting and turning

in the ﬁeld, the tongue cylinder will remain in its last auto-

matically set mid stroke position. When the machine is

lowered, the coulters will automatically return to their pre-

set depth.

Field Adjustments

Lift Switch

Refer to Figure 2-3. The switch at the rear of the Precision

Hitch determines the point in the lift cycle at which the au-

tomatic feature of the Coulter Command will be interrupt-

ed and the depth sensing gauge wheel will be lifted off the

ground for turning around. Since the Precision Hitch trans-

port tires can be lowered during operation to provide ﬂota-

tion for the drill or planter in soft soil conditions, coulter

command should not be interrupted, and the depth sens-

ing gauge wheel should not be lifted until after the trans-

port tires are lowered to the point where they are no longer

used for system ﬂotation. This is usually the point in the lift

cycle when the drill or planter openers are just being lifted

out of the ground.

A cam fastened to the rockshaft activates a plunger switch

which causes the automatic feature of the Coulter Com-

mand to be interrupted and the depth sensing gauge

wheel to be lifted off the ground for turning the Precision

Hitch around in the ﬁeld.

1. To properly adjust the lift switch timing, loosen and ro-

tate the cam assembly so it hits the plunger roller of

the lift switch when the Precision Hitch is raised just

enough to begin to pick the openers out of the ground.

BE CAREFUL NOT TO "BOTTOM OUT" THE LIFT

SWITCH PLUNGER when the plunger roller climbs

the surface of the cam. Tighten the cam onto the rock-

shaft.

2. To adjust the lift switch position loosen the two #10

screws and slide it up or down in the slotted switch

mount holes so the plunger moves in only about

1/8 inch when the cam activates it. DO NOT "BOT-

TOM OUT" THE LIFT SWITCH PLUNGER.

Lift Switch Field Adjustments

Figure 2-3

12681

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Comments to this Manuals

No comments

Great-plains PFH-20 Operator Manual User Manual Page 18

Comments to this Manuals

Related products and manuals for Gardening equipment Great-plains PFH-20 Operator Manual