New Holland T8010 Manual page 1523

PTO Clutch Did Not Lock Up After 6 Seconds Of Clutch Motion
Cause:
The AUX/Hitch/PTO controller monitors the PTO clutch input and output speed. This fault code is recorded when
the PTO does not reach lock up speed within 6 seconds of being turned on.
Possible failure modes:
1. PTO load too heavy.
2. PTO clutch pressure too low.
3. PTO solenoid is not energized.
4. PTO speed sensor and its wiring harness failure.
5. Incorrect alternator installed.
PTO SHAFT SPEED SIGNAL
The PTO shaft speed frequency is derived from a variable reluctance speed sensor in the transmission. The clutch
speed sensor is connected directly to the AUX/Hitch/PTO control module in all versions of the PTO control system.
The sensor output is directly proportional to PTO clutch output speed, and is a quasi-sinusoidal wave form the
amplitude of which is non-linearly proportional to speed. The amplitude range of the signal is from 3 volts peak-to-
peak to 80 volts peak-to-peak centered around chassis ground. Frequency range is from zero to 3,200 Hz worst
case.
PTO SHAFT SIZE SPEED SIGNAL
The PTO shaft size speed frequency is derived from a variable reluctance speed sensor in the transmission. The
sensor is connected directly to the AUX/Hitch/PTO control module and its output is proportional to PTO clutch
output speed, but scaled differently from the PTO clutch speed signal depending upon which PTO shaft is in use;
i.e. 1-3/4" 1000 RPM, 1-3/8" 1000 RPM or 1-3/8" 540 RPM. The signal is a quasi-sinusoidal waveform the
amplitude of which is non-linearly proportional to speed. The amplitude range of the signal is from 3 volts peak-to-
peak to 80 volts peak-to-peak centered around chassis ground. Frequency range is from zero to 760 Hz worst
case.
PTO CLUTCH SLIPPAGE
The PTO clutch slippage limit is set as the follow:
PTO clutch slip> +/-15 % for 5 seconds
Solution:
Make sure there is no PTO clutch slippage caused by either heavy implement load or PTO clutch internal problem.
Test the PTO speed sensor and its wiring harness.
Test the alternator and the engine RPM signal from the alternator.
1. Turn off tractor engine. Check the implement connected to the PTO. Make sure the load is proper and the PTO
shaft is not locked up by the implement.
2. If there is visible PTO shaft slippage with or without implement load, check the PTO clutch pressure and PTO
valve. Check for sticking solenoid, sticking valve spool. leaking clutch seal, burned clutch pad, or broken PTO
shaft.
3. Check the alternator and the engine RPM signal from the alternator.
The PTO clutch input speed is the engine RPM signal from the alternator.
a. Make sure the alternator is the correct model. Incorrect alternator will give wrong signal frequency which
may trigger this fault code.
b. Check for worn alternator belt.
c. Check the engine RPM signal wiring. There should be good continuity between cavity 33 of AUX/Hitch/PTO
controller connector C057 and the terminal W of the alternator.
d. Check the engine RPM signal at terminal W of the alternator.
e. Go to the monitor screen of the service tool. Select parameter PTO ENGINE SPEED FREQUENCE. This is
the PTO clutch input speed.
4. If the PTO shaft turns or it turns for 5 seconds when it is turn on and then stops, go to step 5 and 6.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 175
55-3-104