I just bought a Genie 3268DC. Everything seems to work like its supposed to and at the speed its supposed to but the forward and reverse are at a crawl. I've had a mechanic look at it who is not real familiar with these all electric machines and he tells me the motor seems to be pulling the right amount of volts for all operations but only about 4 or 5 volts when in forward or reverse. Batteries are used but seem fine. I don't believe the machine is in limp mode because if I manually hold a switch to put it into limp mode it runs even slower. I'm thinking it might be an ECU issue, but we are kinda lost on this thing. Thanks.
What is the serial number of this machine? or which control box does it have on it? What are you referring to as the limp mode switch?
It is the oldest version of this model. Before serial # 41200. So I believe it is older than the box on the left. And I don't know what its officially called but by "limp mode" I mean I'm holding down the raised platform switch on one of the scissor beams so the machine thinks the platform is raised and operates at its slowest speed. Probably not called "limp mode" but I saw that somewhere else.
And thanks for the quick help btw. I appreciate it.
The serial # will be helpful. There were a dozen or so wiring schemes used before serial # 41200 so if it gets to the point of actual diagnostics the correct schematic will be beneficial. Inside the upper control box on the circuit board there is an 8 pole dipswitch. DIP = dual inline package. Take a look at the dipswitch settings and let us know which switches are on and which are off.
1,2,5, an 7 are in the raised or "on" position. Serial # is 19198.
Assuming there is a working High Drive Switch on the Upper Control Box: check the voltage at pins 1 and 3 of the DC Motor Controller while Driving the machine in the Stowed High Drive Mode. Don't smash into things or people... Pin 1 should read about 21 to 25vdc. Pin 3 should be a variable signal from 0vdc with Joystick in neutral to approximately 4.8vdc with Joystick fully deployed in either the Forward or Reverse direction. If this is the case, we will move on to more interesting diagnostic stuff...if these voltages are not what they need to be it will probably get expensive real quick. Providing these voltages are what they need to be: Look at this schematic: Notice Valves W, U and V. These are the Series-Parallel High Drive Speed Valves. As it is printed it reflects the machine being in the Low Drive-High Torque Mode. Oil will flow from Pump 2 (lower left of schem) (I arbitrarily labled it #2 in the drawing, it is indeed #1 but lets not sweat the small stuff-same difference) Valve W will block the oil flow and force the oil up to Valve A Valve A is one of 2 Forward-Reverse Valves. Return oil from the Left Drive Motor will travel back through Valve A and on to Valve U and on back to the Tank. Meanwhile: Pump #1 (which is actually #2, get it?...deal with it) is spewing its oil to the Right Drive Motor via Valve B (the other Forward-Reverse Valve) by way of Valve V. Return oil from the Right Drive Motor is sent back to Tank after going back through Valve B. This has the Drive Motors in a Parallel Configuration. One Pump for each Drive Motor. Low Speed but gobs of torque. Now, when the machine is stowed and placed in High Speed using the High Drive Switch (provided there is a working High Drive Switch on the Upper Control Box) ALL THREE OF THE VALVES, W, U and V should have 24voltsDC supplied to them. If not then we will have to find out why. When all three valves (W,U and V) are activated, Valve W will combine oil from both Pumps by connecting them together. Valve U also closes and forces the Return Oil from Valve A to travel to Valve B instead of returning to Tank through Valve U. After it has done its thing in the Right Drive Motor, Valve B Return Oil is directed back to Tank . This puts the Drive Motors in a Series Configuration. The speed will make your hair fly in the wind and cause havoc at the jobsite but alas, there will be little torque so anything larger than an extension cord will probably stop you in your tracks. The location of "the Three Valves": Long story short: When stowed and in High Drive, while moving the Joystick in the Forward or Reverse direction should put 24 volts at Valve W, Valve U and Valve V. If the voltage is present but there is no High Drive we may suspect a valve coil, cartridge or o-ring on a cartridge. Let us know what you find...
I'll try to check in the next couple days. Thanks for all the help you really know your stuff.