|Location||Frederick, Maryland US map|
|Vehicle||1967 Sears Suburban 12 |
Saved from the recycling pile, this tractor was acquired with no engine.
|Motor||Currie XYL-13 Permanent Magnet DC|
600W scooter motor fitted with 2" pulley for 1/2" V-belt.
|Drivetrain||Transaxle, 8-speed (3 forward + reverse, hi/lo final). 1/2 x 30 belt drive from motor.|
|Controller||Yi Yun YK-43|
Apr 2012 - Upgraded to the Yiyun YK-43 1000W controller.
Previous - Currie 40A 24V speed controller from a Currie scooter.
|Batteries||2 Everstart Maxx Marine, 12.00 Volt, Lead-Acid, Flooded|
Group 29 marine battery. RC = 205 minutes
|System Voltage||24 Volts|
|Charger|| All Electronics|
24 Volt 2 Amp 3-mode
|Instrumentation||Visual throttle position indicator|
Visual battery disconnect status
24V battery gauge salvaged from a B&D cordless mower (CMM1000)
50A automotive ammeter
|Top Speed||The older Sears tractors ain't known for their top speed|
|Acceleration||Not scary at all|
|Range||1.5 acres. Hasn't left the yard yet, and probably won't. Range testing info isn't available yet.|
|Seating Capacity||1 adult plus one carefully-supervised lap-carried 5-year-old|
|Curb Weight||400 Pounds (181 Kilograms)|
Haven't put it on the bathroom scale yet. About 100 lbs. in batteries and 300 lbs of tractor.
|Tires||F: 16 x 6 x 8|
R: 22.5 x 7.5 x 12
|Conversion Time||4 months of weekends|
|Conversion Cost||$50 for the donor tractor|
About $400 in additional parts
Lots of labor
3/2010 - +$200 for new tires
4/2012 - +$60 upgraded controller + connectors
|Additional Features||Having the variable speed control is a nice feature. Start up would be abrupt in 2nd and 3rd gear with a simple battery-to-motor contactor arrangement. The motor is attached directly to the transaxle, which makes for a nice compact drive system.|
|The 600W motor is a bit anemic in 3rd/hi. This may be a function of current limiting in the speed controller. Performance testing is ongoing. Had the opportunity to pull the 10" single-bottom plow, and it did well in 1st/low. Didn't have enough grunt to pull the plow in higher gears. The new Carlisle All Trail tires are wonderful, even in wet grass. |
4/2012 - Upgrading to the Yiyun 1000W controller eliminated the gutless behavior in the higher gears. I'm seeing 50+ amps draw at start up, and 3rd-hi is a usable gear now.