Great-plains PFH-20 Operator Manual User Manual download pdf (Page 21)

19

Section 3 Troubleshooting

6/21/2004

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

Great Plains Mfg., Inc.

Coulter depth erratic or will

not adjust when you turn the

"DEPTH CONTROL" dial.

Moisture present in the master control

box.

The master control box in the tractor

must be kept dry. Moisture on the circuit

board or in the control terminals will

cause false readings.

Hydraulic ﬂow rates of more than 12

gallons per minute to the hydraulic con-

trol valve when operating in the

CLOSED-CENTER mode.

Turn down the ﬂow rate on the tractor re-

mote which is providing oil to the tongue

hydraulic circuit.

Inconsistent 12-volt power supply.

Connect the power cord directly to the

battery. The Coulter Command electri-

cal circuit must have a good uninter-

rupted power supply. Fluctuations in

the power supply will cause inconsis-

tent electrical readings.

Transport lift cylinders will not

lift the Precision Hitch for

transport.

OPEN-CENTER tractors with multiple

sets of hydraulic outlets use the #1 cir-

cuit for priority ﬂow which slows down or

cuts off ﬂow to the other circuits. This

problem will occur if Coulter Command

ports "P" and "T" are plugged into the #1

circuit.

Connect transport lift circuit ports "V1" and

"V2" to the #1 hydraulic circuit on OPEN-

CENTER tractors. Ports "P" and "T" of the

Coulter Command hydraulics should con-

nect to another circuit other than the #1 cir-

cuit on OPEN-CENTER tractors.

On CLOSED-CENTER tractors the

Coulter Command should be connected

to a circuit capable of HYDRAULIC MO-

TOR CONTROL for supplying constant

pressure/ﬂow to remote locations. If the

machine will not raise when the hydrau-

lic tongue circuit is "locked in," consult

your tractor dealer. You may need to run

the transport hydraulic circuit on a "pri-

ority circuit" and the hydraulic tongue

circuit on an alternate remote if the trac-

tor hydraulics allows live hydraulic

power to other remotes.

On CLOSED-CENTER tractors, if the

"priority circuit" is the only circuit suit-

able for HYDRAULIC MOTOR

CONTROL or supplying constant pres-

sure/ﬂow to remote locations, then run

the transport hydraulic circuit on the

"priority circuit" and run the hydraulic

tongue circuit on an alternate remote

with the Coulter Command valve in the

OPEN CENTER MODE. See "Tractors

with open center hydraulic systems

or ﬁxed displacement hydraulic

pumps," page 15.

System generating excess

heat when operating in the

OPEN CENTER MODE.

The OPEN CENTER - CLOSED CEN-

TER control knob is not turned

completely counterclockwise.

Turn the knurled control knob on the left

side of the hydraulic valve completely

counterclockwise and lock it in place

with the circular lock disk.

Ball style quick couplers may produce

more heat when circulating continuous

hydraulic ﬂow through them.

Use poppet style male quick couplers.

For tractors with Pioneer quick couplers

use Pioneer 8010-4P poppet style male

couplers when operating in the OPEN

CENTER mode. See Figure 2-2, page

15.

Problem Possible Cause Solution

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