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09-10-2020, 01:58 PM | #11 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 2007 PDS 36V Cart w Alltrax XCT400 Slows to 7mph Uphill
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09-10-2020, 02:02 PM | #12 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,418
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Re: 2007 PDS 36V Cart w Alltrax XCT400 Slows to 7mph Uphill
Are you sure ? Mr Carlisle says they are 17.0395260947762
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09-10-2020, 02:32 PM | #13 | ||
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 2007 PDS 36V Cart w Alltrax XCT400 Slows to 7mph Uphill
Quote:
Quote:
The motor is sick or the cart has some stiff bearings someplace. A stock PDS motor can spin at about 5600RPM when turning stock height tires and powered by a 36V battery pack. That translates to 24.1MPH on level ground and as far as I can tell, your cart is only doing about 18.7MPH on the level ground before it started going downhill, where it got up to about 25.2MPH and would have gone higher, except the XCT applied regen braking to keep the motor below the 6000RPM speed limit it was set to. Does cart push easily (with Run/Tow in Tow, else the Walkaway Safety kicks in and applies regen braking to keep cart under 2MPH). Has the differently oil been changed. Sludge in pan will add drag to cart. So will dragging brake shoes and dry bearings. |
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09-10-2020, 04:44 PM | #14 |
Not Yet Wild
Join Date: Jul 2018
Location: tulsa, ok
Posts: 11
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Re: 2007 PDS 36V Cart w Alltrax XCT400 Slows to 7mph Uphill
JB, my tires are 17” diameter I’d that helps anything make better sense.
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09-10-2020, 05:20 PM | #15 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 2007 PDS 36V Cart w Alltrax XCT400 Slows to 7mph Uphill
Quote:
Also, the 1" shorter than stock tires effectively increases the stock torque by about 6%, so cart shouldn't be slowing as much going uphill. It's been 8 years since I ran a stock PDS motor with an Alltrax controller (DCX - the XCT didn't come out until 2015) and a 36V battery pack (the batteries weren't all that good either), but if I remember correctly, I was getting a top speed of about 23MPH on level pavement and it only slowed to 17MPH on the steepest hills around here. That is roughly a 25% speed reduction and I'd expect something in that same ballpark for your cart, so if it does 18MPH on level ground it ought to do about 13MPH going uphill. Of course there are a ton of variables not being taken into account. |
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09-10-2020, 05:34 PM | #16 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 2007 PDS 36V Cart w Alltrax XCT400 Slows to 7mph Uphill
On his website, Mr. Carlisle says they have a MTD (Mounted Tire Diameter) of 18.3", which is 2.26" off the true diameter. The sidewall markings are closer and they are 1.04" off.
In a nutshell, the only way to know for sure what the height of your cart's tires are, is to measure them. ------------- I believed the numbers on the Carlisle website until I got an XCT which has motor RPM data. My cart speed vs motor RPM calculations weren't coming out right and I eventually realized the tire height was over 2" off, so I measured them. |
09-10-2020, 06:48 PM | #17 |
Not Yet Wild
Join Date: Jul 2018
Location: tulsa, ok
Posts: 11
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Re: 2007 PDS 36V Cart w Alltrax XCT400 Slows to 7mph Uphill
So, something isn’t jiving w this motor compared to a good stock motor. My options are replace the motor for $500 or crack this one open and see if brushes, bearing, or armature is bad?
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09-10-2020, 07:34 PM | #18 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 2007 PDS 36V Cart w Alltrax XCT400 Slows to 7mph Uphill
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09-10-2020, 09:23 PM | #19 |
Not Yet Wild
Join Date: Jul 2018
Location: tulsa, ok
Posts: 11
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Re: 2007 PDS 36V Cart w Alltrax XCT400 Slows to 7mph Uphill
After cooking 30 pork butts to feed 500 people at church this weekend I’ll see if I can muster up enough energy to peak inside the motor and see what gremlins lie within. Thank you for supplying some technical wisdom!
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09-11-2020, 10:13 AM | #20 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 2007 PDS 36V Cart w Alltrax XCT400 Slows to 7mph Uphill
Sounds like a plan. Be sure to use a second wrench on the bottom nut when taking the motor cables off the studs. If the stud turns, bad things can happen inside the motor. Also, check the resistance between the studs on the motor after the cables are removed. Carbon dust get all over everything inside the motor and is conductive, so the amps have an alternate path through the motor, bypassing the windings. With cables disconnected: A1 to A2 should be between 0.3Ω and 1.0Ω. F1 to F2 should be between 1.0Ω and 2.0Ω. A1 to F1 should be between OPEN. F1 to motor case should be 5,000,000Ω or higher. Take pictures of motor's innards. |
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