Hi everyone,
I just joined hoping i could get some help on my backhoe! Thank you in advance for your time and help. I'll try to make this as concise as possible as it has been quite the journey.
I have a New Holland LB75B backhoe that's around 15 years old. I'm not sure of the exact age. My starter issues all started when the battery was constantly being drained to the point where I had to jump it even after one day. From this I determined the battery was no good and the starter was drawing too much energy from the battery. I got a new battery and had the starter rebuilt. I also installed a kill switch on the positive battery cable. (I am only running 1 battery, so i'm not sure if my current problems are a result of this. It came with two, but for whatever reason my father switched to one.)
After the starter was rebuilt, about 10-20 percent of the time the upon starting the starter wouldn't engage fully. It sounds like a power down noise from a sci fi movie. Before I did too much troubleshooting I replaced the relay. After this didn't fix the problem I went through the shop manual and started some troubleshooting.
Initially I tested the voltage draw through the grounding wire and the grounding through the starter flange. It was drawing too much voltage. The shop manual said it shouldn't draw over .2 V and it was drawing around 1V. I cleaned all the connections, tested continuity, tested resistance, and replace the battery clamp. This seemed to somewhat solve the problem as it's only drawing .3V now. Still the problem is persisting
I then did a voltage test of the starter relay and starter motor. All the values are normal except the bold values. If i'm remembering correctly, the bold values were supposed to read around 12 volts when starting. All of them showed a range and were considerably lower than 12 volts. (sorry the format of the table wasn't preserved, so i labeled the results and ignition switch position with letters.)
Starter Relay Voltage Test
Ignition Switch Position
Wire A Off (v) B Aux (V) C On (V) D Start (V)
1 White A 0 B 0 C 0 D 0-9-0
2 Black A 0 B 0 C 0 D 0
3 Red A12.6 B 12.6 C 12.6 D 12.6-6-12.6
4 White/Black A 0 B 0 C 0 D 0-8-0
Starter Motor Voltage Test
Ignition Switch Position
A Off (v) B Aux (V) C On (V) D Start (V)
Post 1(+battery cable) A 12.6 B 12.6 C 12.6 D 12.6-8-12.6
Post 2 (wire) A 0 B 0 C 0 D 0-6
I also did a voltage test of the positive battery cable. It was drawing around 1V when it is supposed to be drawing no more than .2V. I presumed that the lack of voltage during starting on the starter relay and the excess of voltage on the positive battery clamp when starting are related. I went through the positive cables cleaned all the connections, tested for continuity and resistance, and replaced the battery clamp.
After all this, the problem is still persisting. About 10-20% of the time, when I start the machine the starter doesn't engage fully and sounds like it's "powering down." I really don't know what the problem is at this point. Since the problem is intermittent, I suspect the wiring is bad. I can't believe the wiring from the battery to the starter is bad, but maybe I need to replace it? Sorry for the long winded post and thank you if you made it to the end!
I just joined hoping i could get some help on my backhoe! Thank you in advance for your time and help. I'll try to make this as concise as possible as it has been quite the journey.
I have a New Holland LB75B backhoe that's around 15 years old. I'm not sure of the exact age. My starter issues all started when the battery was constantly being drained to the point where I had to jump it even after one day. From this I determined the battery was no good and the starter was drawing too much energy from the battery. I got a new battery and had the starter rebuilt. I also installed a kill switch on the positive battery cable. (I am only running 1 battery, so i'm not sure if my current problems are a result of this. It came with two, but for whatever reason my father switched to one.)
After the starter was rebuilt, about 10-20 percent of the time the upon starting the starter wouldn't engage fully. It sounds like a power down noise from a sci fi movie. Before I did too much troubleshooting I replaced the relay. After this didn't fix the problem I went through the shop manual and started some troubleshooting.
Initially I tested the voltage draw through the grounding wire and the grounding through the starter flange. It was drawing too much voltage. The shop manual said it shouldn't draw over .2 V and it was drawing around 1V. I cleaned all the connections, tested continuity, tested resistance, and replace the battery clamp. This seemed to somewhat solve the problem as it's only drawing .3V now. Still the problem is persisting
I then did a voltage test of the starter relay and starter motor. All the values are normal except the bold values. If i'm remembering correctly, the bold values were supposed to read around 12 volts when starting. All of them showed a range and were considerably lower than 12 volts. (sorry the format of the table wasn't preserved, so i labeled the results and ignition switch position with letters.)
Starter Relay Voltage Test
Ignition Switch Position
Wire A Off (v) B Aux (V) C On (V) D Start (V)
1 White A 0 B 0 C 0 D 0-9-0
2 Black A 0 B 0 C 0 D 0
3 Red A12.6 B 12.6 C 12.6 D 12.6-6-12.6
4 White/Black A 0 B 0 C 0 D 0-8-0
Starter Motor Voltage Test
Ignition Switch Position
A Off (v) B Aux (V) C On (V) D Start (V)
Post 1(+battery cable) A 12.6 B 12.6 C 12.6 D 12.6-8-12.6
Post 2 (wire) A 0 B 0 C 0 D 0-6
I also did a voltage test of the positive battery cable. It was drawing around 1V when it is supposed to be drawing no more than .2V. I presumed that the lack of voltage during starting on the starter relay and the excess of voltage on the positive battery clamp when starting are related. I went through the positive cables cleaned all the connections, tested for continuity and resistance, and replaced the battery clamp.
After all this, the problem is still persisting. About 10-20% of the time, when I start the machine the starter doesn't engage fully and sounds like it's "powering down." I really don't know what the problem is at this point. Since the problem is intermittent, I suspect the wiring is bad. I can't believe the wiring from the battery to the starter is bad, but maybe I need to replace it? Sorry for the long winded post and thank you if you made it to the end!