2008 RXV with Danaher

[Stingray240CS]

My buddy just changed his solenoid and brake with the OEM upgraded versions.

Should it move when placed in just Neutral (it doesnt)? It does move in Neutral and tow mode. Do RXVs have a loud click/clunk when you turned them on? He sent me a video over text, but not sure how to upload it unless I upload it to YouTube first.

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[kernal]

Cart has to be in tow and key switch on to release parking brake so you can push it around. Also regen braking is still available using brake pedal so it can be towed with driver in it.

Every time key is switched on RXV performs a systems test (POST) as follows:

Electric brake - it will attempt to rock the motor a 1/4 turn both ways.

Park brake check - it will engage and then disengage the electric brake to check parking brake function.

Reverse alarm check - it will beep the reverse buzzer. (Yes this means if you remove or disconnect the reverse buzzer on an RXV the cart will fail to run.)

Charger inhibit check - Checks to make sure the charger is not currently plugged into the cart.

Throttle switch check - Also called HPD or high pedal disable. Accelerator must not be pressed or the cart will not run.

Throttle operation check - The cart makes sure the pedal registers both fully closed and fully open voltages correctly.

So yes, there is some clicks/thunks when key is switched on.

[Stingray240CS]

Thank you for taking the time to share that information Kernal. Great info!

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[kernal]

The braking system on the RXV is often misunderstood.

This is how it works:

There are no wheel brakes. All normal braking is done by the motor using regen braking. Regen braking occurs whenever the gas pedal is up. The service brake pedal is present and when pressed, the controller increases regen braking to slow the cart faster. There is no mechanical linkage from the brake pedal to anything. It speaks to the controller electrically. The motor is capable of regen braking all the way to 0 rpm and can and does hold the cart stopped under any conditions (IE. on a hill) until parking brake engagement.

The parking brake, also referred to as the hill brake sometimes, is an electrically operated mechanical brake attached to the end of the motor. It’s operation is automatic requiring no input by the driver. It is fail safe to the engaged position and requires electrical signal to release it. When operating normally is is either all(100%) on or off. It is controlled by the controller as is everything else on an RXV.

The cart drives like an EV and is noticeably different than a standard DC motored golf cart. After some practice you can do a lot of single pedal driving. The service brake pedal feels like power brakes on an automobile to me and is very effective at slowing the cart beyond normal regen. Usually I just have to tap it a time or two. If you have a digital meter on the cart you can see the voltage of the battery pack increase during pedal up “coasting” and a dramatic and rapid increase if the service brake is pressed. I have seen over 60v momentarily when using the brake. When bringing the cart to a stop, the motor holds the cart for a second or two and then the parking brake engages. You can hear it. There are NO detrimental effects to using the SERVICE brake under normal conditions.

Exception: The parking brake will engage while the cart is moving if you mash the service brake far enough, like in a panic/emergency stop. I think Bob Boyce has posted that this is about 60% of brake pedal travel. In my experience you won’t do this accidentally under normal operation. I have had to do this twice in 2 years (panic stop). The rear wheels (both) lock immediately. It was not a violent experience and I was at speed. I don’t know how many times you can do this before damage to the brake occurs but it is not designed to do this a lot.

[Stingray240CS]

All good information and definitely help understand this RXV a little more.

My buddy bought this cart not knowing that there was an issue with the brake. On his first outing the brake failed. I'm guessing the previous owner may have known about this, but what are you going to do.

With the help of the members here I gave him links to a new OEM brake and the upgraded solenoid.

After he installed these new parts he was hearing new sounds that started this thread. He also told me it ran in forward and reverse, but not in Neutral. I thought that might be normal but figures I would check here with you guys.

It sounds like he is all set and everything is working as it should. Really appreciate the help!

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