Re: (ET) tractor

[bushman165s aol com <bushman165s aol com>]

    This is a permanent magnet motor with a centrifugal switch mounted 
inside. Once the motor is up to a certain RPM, the switch closes and 
allows the control system to put full voltage on the armature for third 
speed. Sounds to me like your switch has an issue, since the power pulse 
button works. The actuator for those switches are a failure point that can 
cause damage to the armature. 
You did say, though, that you have 3 speeds with the wheels off the 
ground. This would indicate loose connections or a worn out contactor or 
master disconnect. Too much of a voltage drop at one or all places would 
not give the drive motor enough current to reach the RPM required to close 
the switch.
I would check those things first before looking into a centrifugal switch 
(actuator) issue.
Chad
Sent from my Virgin Mobile phone.


------ Original message------From: RayDate: Sun, May 24, 2015 1:04 PMTo: 
elec-trak cosmos phy tufts edu;Subject:(ET) tractorv:* {behavior:url 
(#default#vml);}I have a B145  wheel horse and it does not want to move 
very fast. It loses power going up hills in L. I have checked the throttle 
switch and you can tell it is going in all three speeds with the wheels 
off the ground.The batteries are fully charged and the mower deck runs 
fine while cutting the lawn.I have checked for power between the frame and 
batteries and there is no draw with a light bulb or meter.It does pick up 
speed with the power pulse button pressed. Is it possible that the drive 
motor is getting weak. Any help would be greatly appreciated.Thank youRay 
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