COMMON TROUBLESHOOTING FOR 500 SERIES APPLICATORS

Trouble shooting checks:
Problem Possible cause Solution
Pump will not run.

1. No voltage to PIP or Pump
controller.
1. Check for short, low voltage, and
replace fuse(s) if necessary.
2. Pump locked up. 2. Clean or rebuild pump if motor is OK.
3. Damaged wire. 3. Repair damaged wire.
4. Fuse blown on Pump controller. 4. Replace fuse and check pump for
short in wire or locked motor.

Pump runs but will not prime.

1. Air leak in intake. 1. Tighten fittings on intake side.
2. Clogged intake. 2. Clean.
3. Restricted outlet. 3. Check and clean tips.
4. Check valve on the outlet is
stuck closed.
4. Clean or repair check valve.
5. Dirt inside pump. 5. Replace pump check valve.

Pump does not develop enough output.

1. Air leaks or clogs on inlet side. 1. Tighten or clean filter bowl assembly.
2. Pump worn or dirty. 2. Rebuild pump.

Moisture reading errors (high or low)

1. Wire disconnected or bad
connection between star wheels
and PIP 1. Reconnect wire.
2. Low power supply to PIP 2. Check voltage at box. (Min of 12 volts
required.) See Diagnostics section of
manual.
3. Wet hay over 75% moisture
4. Ground contact with one or both
star wheels and baler mounted
processor.
4. Reconnect.
5. Short in wire between star
wheels and PIP.
5. Replace wire.
6. Check hay with hand tester to
verify.
6. Contact Harvest Tec if conditions
persist.

Moisture readings erratic.

1. Test bales with hand tester to
verify that cab monitor has more
variation than hand tester.
2. Check all wiring connections for
corrosion or poor contact.
2. Apply dielectric grease to all
connections.
3. Check power supply at tractor.
Voltage should be constant
between 12 and 14 volts.
3. Install voltage surge protection on
tractors alternator.

Flow meter readings do not match up
with product usage.

Product is less than actual product
used.
1. Voltage supplied to meter is less
than 6 volts.
1. Check for a min of 6 volts supplied at
Pump controller.
2. Wiring short in signal to baler
mounted processor.
2. Inspect wire and replace if necessary.
3. Clog in meter. 3. Back flush with water. DO NOT USE
AIR.
4. Using product other than
Harvest Tec
4. Catch and weigh product to check
outputs.

Product shown is more than actual
product used.

1. High voltage supplied to the
meter.
1. Check voltage at Pump controller.
Max of 18 volts.
2. Light interference with meter. 2. Reflection into meter can cause a
high reading. Move meter or protect
from sunlight.
3. Air leak in intake. 3. Look for air bubbles in line. Replace
line or other defective area that is
allowing air into the system.
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4. Using product other than
Harvest Tec
4. Catch and weigh product to check
outputs.

System leaks product out of tips after
shut down.

1. Dirty or defective check valves. 1. Clean or Replace.
Terminal reads under or over power. 1. Verify with mult-meter actual
voltage. Voltage range should be
between 12-14 volts.
1. Clean connections and make sure
applicator is hooked to battery. See
Diagnostics section of manual.

System does not pause at the end of a
row.
1. Short in cable.
2. Damaged sensor.
3. Bad alignment of sensors
1. Replace cable.
2. Replace sensor
3. Check 474 manual for alignment
instructions
Bale rate displays zero.

1. Bale rate sensors are reversed.
2. Short in cable.
3. Damaged sensor.
1. Switch the sensors next to the star
wheel.
2. Replace cable.
3. Replace sensor.

Display will not power up.

1. Connection broke between the
display and the PIP.
2. Short in display cable.
1. Check, clean, and tighten
connections.
2. Replace cable.
Display is too dark or light

1. Change in temperature or light
conditions.
1. Use the monitors contrast control.
Display is locked up/froze. 1. CAN communication not
responding.
2. Broke connection between the
display and PIP or Pump control
and PIP.
1. Check connections at PIP and Pump
controller including the terminating
resistors.
2. Check, clean, and tighten
connections.
3. Power unit down and restart after
steps 1 & 2 are complete.

Display powers up when key is turned
and will not go to the Main Menu screen.

1. CAN communication notresponding.
2. Broke connection between the
display and PIP or Pump control
and PIP.
1. Check connections at PIP and Pump
controller including the terminating
resistors.
2. Check, clean, and tighten
connections.
3. Power unit down and restart after
steps 1 & 2 are complete.

Display is locked up/froze and pumps
continue to run.

1. CAN communication not
responding.
2. Broke connection between the
display and PIP or Pump control
and PIP.
1. Check connections at PIP and Pump
controller including the terminating
resistors.
2. Check, clean, and tighten
connections.
3. Power unit down and restart after
steps 1 & 2 are complete.

Display says PAC error

1. The PIP and Pump controller
are not communicating.
2. Broke connection between the
display and PIP or Pump control
and PIP.
1. Check all connections at PIP and
Pump controller including terminating
resistors.
2. Check, clean, and tighten
connections