Great-plains PFH-20 Operator Manual User Manual download pdf (Page 19)

Section 2 Operating Instructions

6/21/2004

PH-15, PH-20, PFH-15 and PFH-20 Coulter Command System 148-384M

Great Plains Mfg., Inc.

WARNING

Shut the tractor off and put all hydraulic valve levers in neutral

position before attempting to work on or crawl under the ma-

chine. Do not crawl under a raised machine without the trans-

port locks securely in place. Sudden hydraulic activation or

failure could cause serious injury or death.

A properly adjusted lift switch allows the automatic coulter

depth feature to be interrupted early in the lift cycle. This

provides the fastest lift cycle times when turning around in

the ﬁeld. Operating the lift switch early in the lift cycle, also

provides the maximum amount of time for the depth sens-

ing gauge wheel cylinder to completely extend as the ma-

chine is lowered back to ﬁeld position. It is important that

the depth sensing gauge wheel cylinder always be fully ex-

tended when the Precision Hitch is in ﬁeld position to allow

the depth sensing gauge wheel to ﬂoat through its full

range of motion.

Speed Sensor

The Coulter Command depth control system automatically

compensates for changes in ground speed. A speed sen-

sor and speed sensor plate mounted behind the coulter

depth sensing wheel monitors the ground speed so the

Coulter Command can adjust for it. This sensor should be

in close proximity to the speed sensor plate. In general, it

should never need adjustment. If the sensor does get

moved, it should be adjusted against the speed sensor

plate until it just touches the plate in the closest part of the

rotation. A bent speed sensor plate should be straight-

ened or replaced immediately. To adjust the speed sensor,

loosen the two #6 screws on the sensor and slide it toward

the speed sensor plate. Rotate the depth sensing wheel to

the position where the speed sensor plate is closest to the

sensor mount, and retighten the sensor mount screws

where the sensor just touches the speed sensor plate.

Hydraulic Valve

All adjustable valve cartridges on the hydraulic valve

blocks are preset at the manufacturer and should not be

tampered with. Tampering with a cartridge valve could re-

sult severe frame damage to the Precision Hitch.

The only required adjustment is on the upper hydraulic

control valve. This valve contains a rotary knob for setting

the Coulter Command to be used with either OPEN CEN-

TERED or CLOSED CENTERED tractor hydraulics.

Check the owners manual of your tractor to determine

what type of hydraulic system you have.

Refer to “Hydraulic Hook-Up & Function” on page 14 of

this manual for setting the hydraulic control valve for your

style of tractor.

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Great-plains PFH-20 Operator Manual User Manual Page 19

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