The alternator on my DK40SE (2008) died so I tried to find parts to repair the alternator. Only thing I found was a new alternator from eBay for $250.00. I understand that the same alternator is used on many DK and CK series tractors (Valeo TA000A58101) so I like to share what I found for a substitute!
My experience with alternators has been that most of the time it痴 the voltage regulator that has gone bad. After watching a guy replace my voltage regulator years ago, it痴 really a simple job that only requires basic soldering skills. Over the years, I have revived many alternators by simply replacing the regulator. In my search for a substitute alternator for the tractor, I wanted one with parts that were available and reasonably priced.
With that said, here is the alternator I found that is almost a direct replacement. It痴 built by Mitsubishi and made for a 1983 Mazda B2000 truck ($58.00 at OReilly痴 Auto Parts). This alternator uses the same wiring plug as the Kioti and uses the original Kioti mounting bolts to install on the tractor and the best thing is, it has the same offset from the pulley so the mounts do not need altering!
However, there are some differences with the Mitsubishi alternator. The Mitsubishi alternator has an external fan and the Valeo has an internal fan (older model alternators were typically designed with an external fan). The Mitsubishi mounting holes are about a ｽ taller than the Valeo and require loosening the top mount bolt on the engine block to raise the top alternator bracket to allow for the taller bolt pattern. The Mitsubishi alternator also has a wider lower mount that requires shimming with 8 x 3/8 washers and the overall diameter of the alternator is a bit bigger that makes installing the belt a knuckle buster. The Valeo pulley needs to be installed on the Mitsubishi alternator, it痴 a bit smaller and saves having to purchase a longer belt. Actually, the smaller Valeo pulley should be used because the diesel engine runs at a lower RPM as compared to the gasoline engine on the Mazda!
If you are familiar with the Lester cross reference guide for alternators, this is a Lester 14307. The alternator fits several models of Mazda from the early 1980痴. The replacement voltage regulator runs about $30.00 and a set of brushes are $8.00. Next time I have problems with this alternator, it will be a cheap repair!
A couple of installation suggestion! I found that it was easier to set the belt in the alternator pulley before bolting the alternator to the mounts. To properly align the new alternator pulley, be sure to install the OEM bolt shim in front of the lower mount. The 2 wire plug on the back of the alternator is correctly wired for the Kioti and the Kioti plug will plug right in. While you have the plug off, check for corrosion. My original alternator died due to corrosion in this plug (the sensor wire could not read battery voltage correctly). This caused the alternator to continuously overcharge the battery and eventually killing the alternator!
The pictures attached show the original Valeo alternator, the replacement Mitsubishi alternator and the performance chart for the Mitsubishi alternator. Note that the performance at 2400 RPM痴 is 47 amps. The Valeo pulley is about ｼ smaller so the alternator will spin a little faster and should be producing about 50 amps at 2600 RPM痴.
My experience with alternators has been that most of the time it痴 the voltage regulator that has gone bad. After watching a guy replace my voltage regulator years ago, it痴 really a simple job that only requires basic soldering skills. Over the years, I have revived many alternators by simply replacing the regulator. In my search for a substitute alternator for the tractor, I wanted one with parts that were available and reasonably priced.
With that said, here is the alternator I found that is almost a direct replacement. It痴 built by Mitsubishi and made for a 1983 Mazda B2000 truck ($58.00 at OReilly痴 Auto Parts). This alternator uses the same wiring plug as the Kioti and uses the original Kioti mounting bolts to install on the tractor and the best thing is, it has the same offset from the pulley so the mounts do not need altering!
However, there are some differences with the Mitsubishi alternator. The Mitsubishi alternator has an external fan and the Valeo has an internal fan (older model alternators were typically designed with an external fan). The Mitsubishi mounting holes are about a ｽ taller than the Valeo and require loosening the top mount bolt on the engine block to raise the top alternator bracket to allow for the taller bolt pattern. The Mitsubishi alternator also has a wider lower mount that requires shimming with 8 x 3/8 washers and the overall diameter of the alternator is a bit bigger that makes installing the belt a knuckle buster. The Valeo pulley needs to be installed on the Mitsubishi alternator, it痴 a bit smaller and saves having to purchase a longer belt. Actually, the smaller Valeo pulley should be used because the diesel engine runs at a lower RPM as compared to the gasoline engine on the Mazda!
If you are familiar with the Lester cross reference guide for alternators, this is a Lester 14307. The alternator fits several models of Mazda from the early 1980痴. The replacement voltage regulator runs about $30.00 and a set of brushes are $8.00. Next time I have problems with this alternator, it will be a cheap repair!
A couple of installation suggestion! I found that it was easier to set the belt in the alternator pulley before bolting the alternator to the mounts. To properly align the new alternator pulley, be sure to install the OEM bolt shim in front of the lower mount. The 2 wire plug on the back of the alternator is correctly wired for the Kioti and the Kioti plug will plug right in. While you have the plug off, check for corrosion. My original alternator died due to corrosion in this plug (the sensor wire could not read battery voltage correctly). This caused the alternator to continuously overcharge the battery and eventually killing the alternator!
The pictures attached show the original Valeo alternator, the replacement Mitsubishi alternator and the performance chart for the Mitsubishi alternator. Note that the performance at 2400 RPM痴 is 47 amps. The Valeo pulley is about ｼ smaller so the alternator will spin a little faster and should be producing about 50 amps at 2600 RPM痴.
